Getting help

Google Maps API Tutorial

There’s lots more info at the Mapki

You can search the Google Group for similar problems

You can also ask for help there but if you do, please post a link to your page where you’re having problems, that will vastly increase your chances of getting useful assistance. Avoid posting large chunks of Javascript code to the group, links to web pages are much preferred, since we can immediately run our Javascript debugging tools on them.

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Resources

Google Maps API Tutorial

The Mashups Book

Beginning Google Maps Mashups with Mapplets, KML, and GeoRSS

If you’re new to JavaScript, or have never programmed in any computer language, and are having difficulties following this tutorial and the Google documentation, then get this book.

Beginning Google Maps Mashups with Mapplets, KML, and GeoRSS by Sterling Udell takes you through the basics of Google Maps, explaining almost every line of code in considerable detail.

Unlike the previous Google Maps Applications book you don’t need any prior knowledge of anything to be able to get into this book. The concepts that you’ll need to use are explained from scratch, assuming no prior knowledge of JavaScript, XML, KML, GeoRSS, PHP, mySQL, etc. Similarly, any mapping concepts that you might need (such as degrees, minutes and seconds of latitude and longitude, or the Mercator projection) are explained in some detail. Using MyMaps to create KML files is explained almost click by click.

The downside of explaining everything from scratch in so much detail is that the book ends up not covering an awful lot of ground. If you already have some knowledge of Javascript, and are capable of following online tutorials and the Google documentation, then you’ll probably find large chunks of this book redundant.

One common problem with books related to the Internet is that they get out of date really fast. The Google Maps API continues to grow, with new features being added all the time. That doesn’t apply to this book very much because it doesn’t push the boundaries of what’s available. In fact, the author recommends that for live sites you load a specific version of the API code, so as to be protected against possible future changes in the API. The examples in the book are written to use release v2.124, which came out in August 2008.

Throughout the book, the author encourages the use of appropriate standards and best coding practice.

The book is divided into four parts.

Part 1: The Geoweb and the Google Maps API explains the basic philosophy behind the Mashupconcept – that machine readable Geodata in standard formats can allow that other people to map the data in useful ways that the creator of the data never thought of. It covers creating your first Google Map, using GGeoXml to add someone else’s data to it, and adding some extra features like driving directions and traffic overlays.

Part 2: Mashing up Google Maps with Mapplets covers creating and publishing simple Mapplets. The author provides a modified version of my EGeoXml extension which uses iGoogle Gadget calls to read KML files from any domain, thus allowing XML files to be rendered within the mapplet.

Part 3: Ready for the big leagues An assortment of slightly more advanced API topics is covered, plus the ability to use PHP and SQL to dynamically generate KML and GeoRSS feeds. Finally there’s a case study of a comprehensive project.

Appendixes These cover:

  • Mapping concepts: like latitude, longitude and the Mercator projection
  • A Javascript primer: a pretty decent attempt to cover Javascript in only 23 pages
  • Debugging tips
  • A list of online resources

Resources

Google Maps API Tutorial

Some Recommended Tools

Venkman Javascript Debugger

Venkman is the original Javascript Debugger for Firefox and Mozilla. Venkman forms part of the standard Mozilla package and is available as a Firefox extension. You can get the Firefox version here. It’s got a pretty steep learning curve.

I now recommend Firebug (see below) rather than Venkman.

Tidy HTML Validator

There are several HTML validation routines around. I happen to like this one because it’s not overly pedantic about tiny details, and it gives a neat concise explanation of the reasons why it thinks your HTML is incorrect.

It comes as a Firefox extension, and puts a little green tick on the status bar when it considers your code to be valid, so you don’t have to keep remembering to send your page to an external validator whenever you change something, you just watch to see if the green tick turns into a yellow triangle or a red cross.

The Windows version is here. There are Linux, MacOSX and FreeBSD versions here.

Web Developer

An indispensable Firefox Extension for general web development.

For Google maps API work, its “Information:View Javascript” facility is very useful for instantly collecting together all the Javascript contained in the webpage and in all the files that it loads. And the “Disable:Disable Styles:Disable Individual Stylesheet” comes in handy for spotting if any of the strange behaviours of your map are due to CSS settings.

Download the Firefox version here.

Javascript: The Definitive Guide

By David Flanagan. This is the book to read if you want to learn more about Javascript.

It’s part of the O’Reilly series of Definitive Guides, which are all excellent resources for their respective topics.

w3schools

w3schools  is an excellent resource for finding details of almost any web-related technology. Of particular interest to API programmers are their Javscript Tutorial and their Javascript Reference, but their information on other topics can be very useful. If you just want to know about how to use one or two features of a technology like XSLT or CSS, you’ll find comprehensive information and clear examples.

The technologies covered are: HTML, XHTML, CSS, TCP/IP, XML, XSL, XSLT, XSL-FO, XPath, XQuery, XLink, XPointer, DTD, Schema, XML DOM, XForms, SOAP, WSDL, RDF, RSS, WAP, Web Services, JavaScript, HTML DOM, DHTML, VBScript, E4X, WMLScript, SQL, ASP, ADO, PHP, .NET, .NET Microsoft, .NET ASP, .NET Mobile, Media, SMIL, SVG and Flash.

And it’s all free.

MS Visual Web Developer Express

msdn.microsoft.com/vstudio/express/vwd/

Some people have recommended this Microsoft tool. I can’t comment since my computer falls short of the system requirements in almost every category, so I’ve not tried it.

Debugbar

Provides a facility within MSIE that mimics Firebug.

It contains a DOM inspector, HTTP inspector, Javascript Inspector, Javascript console, HTML validator.

It’s still in beta, and performs very erratically on my machine, and interferes with the behaviour of Google Maps, but it’s an awful lot better than nothing.

http://www.debugbar.com/

Companion.js

Javascript debugger for MSIE.

http://www.my-debugbar.com/wiki/CompanionJS/HomePage

Requires Microsoft Script Debugger.

I’ve not tried this out yet.

ieTab

https://addons.mozilla.org/firefox/1419/

Embeds a copy of Internet Explorer inside a Mozilla/Firefox tab.

I think there are only versions for Windows.

This is a great tool for web developers, since you can develop your code in Firefox. Then, with a single click of the ieTab icon, you can see what sort of mess MSIE makes of it, and still be in a Firefox environment.

Firebug

http://www.getfirebug.com

Firebug is an extension that integrates with Firefox to put a wealth of development tools at your fingertips while you browse. You can edit, debug, and monitor CSS, HTML, and JavaScript live in any web page.

Unlike Web Developer, Firebug works on the dynamic version of the page, so, for example, you can look at the way the html elements that contain the map change as you make calls to the API.

To get the best out of Firebug, you need to install the Firefox DOM Inspector. The DOM Inspector isn’t an extension, it’s an optional component of Firefox. To install the DOM Inspector you need to re-install Firefox and choose the “Custom Setup” option instead of “Standard”.

There seem to occasionally be severe conflicts between Venkman and Firebug, when Venkman tries to handle errors that are thrown by the Firebug code. I’ve ended up uninstalling Firebug for now, because I’ve already invested a lot of time learning Venkman. If you’re starting out from scratch, I’d suggest learning Firebug rather than Venkman plus Web Developer.

Chrome Inspector

View your page in Google Chrome, right-click on an element and select “Inspect Element”.

This gives you:

  • A detailed view of the dynamic HTML and styles, including the details of what’s going on inside the map structure.
  • A Javascript command console.
  • Information about the timing and size of resources such as image files and Javascript modules.

Pagetest

Useful for addressing performance issues. Provides standard performance tests for your web page.

Paste the URL of your page into pagetest.patrickmeenan.com:8080/

I recommend this rather than using the resources information from Firebug or Google Chrome because they give results that are distorted by the fact that connectivity to your own server may well be perceived as being much faster than other people will see it. The tests are performed with MSIE, which has performance issues which may need to be addressed which Firefox and Chrome don’t exhibit. You get the option to perform the tests over three different line speeds.

Resources

Google Maps API Tutorial

GEvents

Here’s a list of the accessible GEvent types.

Event Object Parameters
“addmaptype” GMap2, GMap map type
“addoverlay” GMap2, GMap overlay
“clearoverlays” GMap2, GMap
“click” GMap2, GMap overly, latlng, overlaylatlng
“dblclick” GMap2, GMap the first parameter is always null
The second parameter is the GLatLng
“drag” GMap2, GMap
“dragend” GMap2, GMap
“dragstart” GMap2, GMap
“infowindowbeforeclose” GMap2, GMap
“infowindowclose” GMap2, GMap
“infowindowopen” GMap2, GMap
“load” GMap2, GMap
“maptypechanged” GMap2, GMap
“move” GMap2, GMap
“moveend” GMap2, GMap
“movestart” GMap2, GMap
“mousemove” GMap2, GMap GLatLng
“mouseout” GMap2, GMap GLatLng
“mouseover” GMap2, GMap GLatLng
“removemaptype” GMap2, GMap map type
“removeoverlay” GMap2, GMap overlay
“resize” GMap2, GMap
“singlerightclick” GMap2, GMap 1. GLatLng() identifying the pixel position of the mouse within the map div.
2. URL of tile (if over the base map)
3. Map container if over the base map. Reference to the Gmarker if over a marker.
“zoomend” GMap2, GMap old zoom level, new zoom level
“zooming” GMap2, GMap
“zoomstart” GMap2, GMap direction (+1 = zoom in, -1 = zoom out)
latlng pivot
bool recentering
Event Object Parameters
“zoom” GMap old zoom level, new zoom level (v1 syntax)
Event Object Parameters
“newcopyright” GMapType copyright
Event Object Parameters
“newcopyright” GTileLayer copyright
Event Object Parameters
“newcopyright” GCopyrightCollection copyright
Event Object Parameters
“click” GMarker latlng of marker
“changed” GMarker marker, previous position
“dblclick” GMarker latlng of marker
“drag” GMarker latlng
“dragend” GMarker latlng
“dragstart” GMarker latlng
“infowindowbeforeclose” GMarker marker
“infowindowclose” GMarker marker
“infowindowopen” GMarker marker
“infowindowprepareopen” GMarker marker
“mousedown” GMarker latlng of marker
“mouseover” GMarker latlng of marker
“mouseout” GMarker latlng of marker
“mouseup” GMarker latlng of marker
“remove” GMarker
“visibilitychanged” GMarker true if the marker is now visible, else false
Event Object Parameters
“changed” GMarkerManager GBounds indicating active region in units of 1024×1024 pixels, number of active markers
Event Object Parameters
“cancelline” GPolyline
“click” GPolyline GLatLng of clicked location
“endline” GPolyline
“lineupdated” GPolyline
“mouseout” GPolyline
“mouseover” GPolyline
“remove” GPolyline
“visibilitychanged” GPolyline true if the poly is now visible, else false
Event Object Parameters
“cancelline” GPolygon
“click” GPolygon GLatLng of clicked location
“endline” GPolygon
“lineupdated” GPolygon
“mouseout” GPolygon
“mouseover” GPolygon
“remove” GPolygon
“visibilitychanged” GPolygon true if the poly is now visible, else false
Event Object Parameters
“moveend” GKeyboardHandler
“movestart” GKeyboardHandler
Event Object Parameters
“animate” [GInfoWindow] proportion of the animation that has been performed
“closeclick” [GInfoWindow]
“maximizeclick” [GInfoWindow]
“maximizeend” [GInfoWindow]
“restoreclick” [GInfoWindow]
“restoreend” [GInfoWindow]
Event Object Parameters
“click” GDraggableObject browser-specific event object
“dblclick” GDraggableObject browser-specific event object
“drag” GDraggableObject browser-specific event object
“dragend” GDraggableObject browser-specific event object
“dragstart” GDraggableObject browser-specific event object
“mouseup” GDraggableObject browser-specific event object
“mousedown” GDraggableObject browser-specific event object
“move” GDraggableObject
Event Object Parameters
“visibilitychanged” GScreenOverlay true if the overlay is now visible, else false
Event Object Parameters
“visibilitychanged” GGroundOverlay true if the overlay is now visible, else false
Event Object Parameters
“load” GGeoXml
Event Object Parameters
“changed” GTrafficOverlay true if the viewport contains traffic data
Event Object Parameters
“error” GStreetViewPanorama error code
“initialized” GStreetViewPanorama location object
“pitchchanged” GStreetViewPanorama pitch
“yawchanged” GStreetViewPanorama yaw
“zoomchanged” GStreetViewPanorama zoom
Event Object Parameters
“changed” GStreetViewOverlay true if the viewport contains StreetView data

Notes

  1. Watch out for those parameters. The same event can have different parameters with different objects.
  2. The GInfoWindow class isn’t directly accessible, but you can use GEvent.addListener(map.getInfoWindow(),”closeclick” …).
  3. The “closeclick” event is only triggered when the user actually clicks on the info window close icon, not for anything else that closes the info window.
  4. Watch out for the difference between the “zoom” event (GMap() only) which returns zoom levels in APIv1 format and the “zoomend” event which returns zoom levels in APIv2 format.
  5. To differentiate the situation where the user moves the map rather than the map being moved by code, you can use drag* and dblclick events. The move* events are triggered by anything that moves the map, which can include calls made by your own Javascript code and the opening of an info window.

Custom Events

It’s also possible to use the GEvent system to pass messages between different parts of your own code with custom events. Simply use GEvent.addListener(marker, “myevent”) to listen for the event andGEvent.trigger(marker, “myevent”) to trigger it. You can pass up to two parameters.

You can pass these custom events on any object, these can be API objects, HTML elements, data structures, or any type of Object().

 GEvent.addListener(map, "myevent", ... GEvent.addListener(document.getElementById("message"), "thisevent", ... var fred = new Object(); GEvent.addListener(fred, "thatevent", ... 

GEvent.addDomListener

It’s also possible to use GEvent.addDomListener() to listen for Dom events on HTML Elements.

Writing GEvent.addDomListener(document.getElementById(“button”), “mouseover”, … has a similar effect to writing <input id=”button” onmouseover=”…”>, but there are one or two advantages to using the GEvent system:

  1. You may find it easier to add or remove GEvent listeners
  2. You can use GEvent.trigger on these events

You can use this system to handle any of the standard HTML Dom events: “blur”, “click”, “dblclick”, “focus”, “keydown”, “keypress”, “keyup”, “load”, “mousedown”, “mousemove”, “mouseout”, “mouseover”, “mouseup”.

When using this system, the full event details are passed in the first parameter. So for example you could write

GEvent.addDomListener(document.getElementById("map"), "click", function(e) {...

and then examine the details of the event “e” and behave differently if, say, the ALT or CTRL keys were pressed by testing if (e.altKey) or if (e.ctrlKey).

Note that if you write GEvent.addDomListener(map, “click” then you don’t get the Dom event because a GMap2() object isn’t a HTML element. You get the conventional “map click” event instead, with the parameters “overlay” and “latlng”.

Resources

Google Maps API Tutorial

Unofficial Reference

This page is an unofficial reference to all the objects, classes, properties and methods that are accessible in the API

See also the Official Google Maps API Documentation

GAddCopyright
GAddMessages
GAdsManager
GBounds
GBrowserIsCompatible
GClientGeocoder
GControl
GControlPosition
GCopyright
GCopyrightCollection
GDirections
GDownloadUrl
GDraggableObject
GEvent
GFactualGeocodeCache
GGeoXml
GGeocodeCache
GGroundOverlay
GHierarchicalMapTypeControl
GIcon
GInfoWindow
GInfoWindowTab
GKeyboardHandler
GLargeMapControl
GLargeMapControl3D
GLatLng
GLatLngBounds
GLayer
GLoad
GLoadMapsScript
GLog
GMap
GMap2
GMapType
GMapTypeControl
GMapUIOptions
GMarker
GMarkerManager
GMenuMapTypeControl
GMercatorProjection
GNavLabelControl
GOverlay
GOverviewMapControl
GPoint
GPolygon
GPolyline
GProjection
GRoute
GScaleControl
GScreenOverlay
GScreenPoint
GScreenSize
GScript
GSize
GSmallMapControl
GSmallZoomControl
GSmallZoomControl3D
GStep
GStreetviewClient
GStreetviewOverlay
GStreetviewPanorama
GTileLayer
GTileLayerOverlay
GTrafficOverlay
GUnload
GUnloadApi
GValidateKey
GVerify
GXml
GXmlHttp
GXslt
G_ANCHOR_BOTTOM_LEFT
G_ANCHOR_BOTTOM_RIGHT
G_ANCHOR_TOP_LEFT
G_ANCHOR_TOP_RIGHT
G_API_VERSION
G_DEFAULT_ICON
G_DEFAULT_MAP_TYPES
G_GEO_BAD_KEY
G_GEO_MISSING_ADDRESS
G_GEO_SERVER_ERROR
G_GEO_SUCCESS
G_GEO_TOO_MANY_QUERIES
G_GEO_UNAVAILABLE_ADDRESS
G_GEO_UNKNOWN_ADDRESS
G_GOOGLEBAR_LINK_TARGET_BLANK
G_GOOGLEBAR_LINK_TARGET_PARENT
G_GOOGLEBAR_LINK_TARGET_SELF
G_GOOGLEBAR_LINK_TARGET_TOP
G_GOOGLEBAR_RESULT_LIST_INLINE
G_GOOGLEBAR_RESULT_LIST_SUPPRESS
G_HYBRID_MAP
G_MAPMAKER_HYBRID_MAP
G_MAPMAKER_MAP_TYPES
G_MAPMAKER_NORMAL_MAP
G_MAP_FLOAT_PANE
G_MAP_FLOAT_SHADOW_PANE
G_MAP_MAP_PANE
G_MAP_MARKER_MOUSE_TARGET_PANE
G_MAP_MARKER_PANE
G_MAP_MARKER_SHADOW_PANE
G_MAP_OVERLAY_LAYER_PANE
G_MARS_ELEVATION_MAP
G_MARS_INFRARED_MAP
G_MARS_MAP_TYPES
G_MARS_VISIBLE_MAP
G_MOON_ELEVATION_MAP
G_MOON_MAP_TYPES
G_MOON_VISIBLE_MAP
G_NORMAL_MAP
G_PHYSICAL_MAP
G_SATELLITE_3D_MAP
G_SATELLITE_MAP
G_SKY_MAP_TYPES
G_SKY_VISIBLE_MAP
G_TRAVEL_MODE_DRIVING
G_TRAVEL_MODE_WALKING

G_ANCHOR_BOTTOM_LEFT

Constant containing the number 2. Can be used for setting a GControlPosition() anchor.
G_ANCHOR_BOTTOM_RIGHT

Constant containing the number 3. Can be used for setting a GControlPosition() anchor.
G_ANCHOR_TOP_LEFT

Constant containing the number 0. Can be used for setting a GControlPosition() anchor.
G_ANCHOR_TOP_RIGHT

Constant containing the number 1. Can be used for setting a GControlPosition() anchor.
G_API_VERSION

undocumented Constant indicating the digits after the “.” in the API version number. E.g. for v2.126 it returns 126.
G_DEFAULT_ICON

A GIcon() object describing the default icon.
Has all the properties and methods of the GIcon() class.
G_DEFAULT_MAP_TYPES

An array of GMapType() objects identifying the map types which will be available by default.
G_GEO_BAD_KEY

A constant containing the code number that represents a GClientGeocoder failure due to an incorrect API key being used.
G_GEO_MISSING_ADDRESS

A constant containing the code number that represents a GClientGeocoder failure due to no address being submitted.
G_GEO_SERVER_ERROR

A constant containing the code number that represents a GClientGeocoder failure but the reason is not known.
G_GEO_SUCCESS

A constant containing the code number that represents a GClientGeocoder success.
G_GEO_TOO_MANY_QUERIES

A constant containing the code number that represents a GClientGeocoder failure due to your quota being exceeded..
G_GEO_UNAVAILABLE_ADDRESS

A constant containing the code number that represents a GClientGeocoder failure due to legal or contractual reasons.
G_GEO_UNKNOWN_ADDRESS

A constant containing the code number that represents a GClientGeocoder failure due to no known location matching the address.
G_GOOGLEBAR_LINK_TARGET_BLANK

A string constant that can be used in googleBarOptions.
G_GOOGLEBAR_LINK_TARGET_PARENT

A string constant that can be used in googleBarOptions.
G_GOOGLEBAR_LINK_TARGET_SELF

A string constant that can be used in googleBarOptions.
G_GOOGLEBAR_LINK_TARGET_TOP

A string constant that can be used in googleBarOptions.
G_GOOGLEBAR_RESULT_LIST_INLINE

A string constant that can be used in googleBarOptions.
G_GOOGLEBAR_RESULT_LIST_SUPPRESS

A string constant that can be used in googleBarOptions.
G_HYBRID_MAP

A GMapType() object describing the Hybrid Map Type
Has all the properties and methods of the GMapType() class.
G_MAPMAKER_MAP_TYPES

An array of GMapType() objects identifying a set of MapMAker map types.
G_MAPMAKER_NORMAL_MAP

A GMapType() object describing a Map Type containing MapMaker street maps.
Has all the properties and methods of the GMapType() class.
This feature us currently disabled by loader token _mF[188].
G_MAPMAKER_HYBRID_MAP

A GMapType() object describing a Map Type that is a hybrid of the satellite tiles and the MapMaker streets.
Has all the properties and methods of the GMapType() class.
This feature us currently disabled by loader token _mF[188].
G_MAP_FLOAT_PANE

Constant containing the number 7. Can be used with the GMap2.getPane() method to get a reference to a pane.
G_MAP_FLOAT_SHADOW_PANE

Constant containing the number 5. Can be used with the GMap2.getPane() method to get a reference to a pane.
G_MAP_MAP_PANE

Constant containing the number 0. Can be used with the GMap2.getPane() method to get a reference to a pane.
G_MAP_MARKER_MOUSE_TARGET_PANE

Constant containing the number 6. Can be used with the GMap2.getPane() method to get a reference to a pane.
G_MAP_MARKER_PANE

Constant containing the number 4. Can be used with the GMap2.getPane() method to get a reference to a pane.
G_MAP_MARKER_SHADOW_PANE

Constant containing the number 2. Can be used with the GMap2.getPane() method to get a reference to a pane.
G_MAP_OVERLAY_LAYER_PANE

Constant containing the number 1. Can be used with the GMap2.getPane() method to get a reference to a pane.
G_MARS_ELEVATION_MAP

A GMapType() object describing the Mars Elevation Map Type
Has all the properties and methods of the GMapType() class.
G_MARS_INFRARED_MAP

A GMapType() object describing the Mars Infra Red Map Type
Has all the properties and methods of the GMapType() class.
G_MARS_MAP_TYPES

An array of GMapType() objects identifying the map types associated with Mars. You can use it like {mapTypes:G_MARS_MAP_TYPES} when creating the GMap2.
G_MARS_VISIBLE_MAP

A GMapType() object describing the Mars Visible Map Type
Has all the properties and methods of the GMapType() class.
G_MOON_ELEVATION_MAP

A GMapType() object describing the Lunar Elevation Map Type
Has all the properties and methods of the GMapType() class.
G_MOON_MAP_TYPES

An array of GMapType() objects identifying the map types associated with the Moon. You can use it like {mapTypes:G_MOON_MAP_TYPES} when creating the GMap2.
G_MOON_VISIBLE_MAP

A GMapType() object describing the Lunar Visible Map Type
Has all the properties and methods of the GMapType() class.
G_NORMAL_MAP

A GMapType() object describing the Normal Map Type
Has all the properties and methods of the GMapType() class.
G_PHYSICAL_MAP

A GMapType() object describing the Physical Map Type
Has all the properties and methods of the GMapType() class.
G_SATELLITE_3D_MAP

A GMapType() object describing the Google Earth Map Type
Has all the properties and methods of the GMapType() class.
The Google Earth Map Type requires the Google Earth Browser Plug-In.

Only a limited number of features are supported in this map type.

G_SATELLITE_MAP

A GMapType() object describing the Satellite Map Type
Has all the properties and methods of the GMapType() class.
G_SKY_MAP_TYPES

An array of GMapType() objects identifying the map types associated with the sky view. You can use it like {mapTypes:G_SKY_MAP_TYPES} when creating the GMap2.
G_SKY_VISIBLE_MAP

A GMapType() object describing the Sky Map Type
Has all the properties and methods of the GMapType() class.
G_TRAVEL_MODE_DRIVING

Constant containing the number 0. Can be used for GDirections travelMode.
G_TRAVEL_MODE_WALKING

Constant containing the number 1. Can be used for GDirections travelMode.

GAddCopyright()

This function can be used to add information about the copyright text for a region within a map type.
parameters
a string the getUrlArg() of the maptype to which the copyright applies.
b string id
c float min latitude
d float min longitude
e float max latitude
f float max longitude
g integer min zoom level
h string copyright text
i integer max zoom level
j boolean I’m not sure what this does
GAddMessages()

This undocumented function inserts text strings into the language specific message list.
parameters
a object An object specifying the list of messages.

For example:
GAddMessages({10093:’Conditions d\x27utilisation’,10507:’Déplacer vers la gauche’});
replaces the texts “Terms of Use” and “Pan Left” with their French equivalents.

GAdsManager()

Controls the display of AdSense adverts on the map.
parameters
map the map on which the ads are to be displayed.
AdSense Id Publisher id of your AdSense account
opts options

options
maxAdsOnMap Maximum number of ads to be displayed: default = 3.
channel AdSense channel, can be used to track ad revenue.
minZoomLevel Minimum zoom level for ad display: default = 6.

Methods
enable() Enables ad display.
disable() Disables ad display.
GBounds()

Identifies a rectangular geographical region using APIv1 syntax, or a rectangular region specified in pixels
Constructor new GBounds(array)
An array of GPoint()s or GLatLng()s. The GBounds object that just includes those points is created.
properties
minX Coordinate of the West edge
maxX Coordinate of the East edge
minY Coordinate of the South edge
maxY Coordinate of the North edge
Methods
containsBounds(bounds) Returns true if it fully contains the other bounds
containsPoint(gpoint) Returns true if it contains the GPoint
copy() undocumented Returns a new GBounds that is a copy of this one.
equals(bounds) returns true if the two GBounds are equal
extend(point) Enlarges the bounds to be the smallest rectangle containing the previous area plus the specified location
toString() Returns a string in the format ((33.123, -120.123), (45.123, -100.234)).
max() Returns a GPoint() representing the Northeast corner.
min() Returns a GPoint() representing the SouthWest corner.
mid() Returns a GPoint() representing the centre.
Static Methods
GBounds().intersection(bounds,bounds) undocumented Returns a new GBounds representing the intersection of the two supplied GBounds
GBounds().intersects(bounds,bounds) undocumented Returns true if the two GBounds intersect.
GBrowserIsCompatible()

This function returns true if the current browser supports the Google Maps API.

parameters
a bool If true, the agent name is used as the class attribute of the <body> element. What it means in practice is that your page behaves as if you had written <body class=”firefox”> or <body class=”msie”>, etc.
So by calling GBrowserIsCompatible(true) you can have different CSS behaviour depending on the browser, simply by writing different CSS styles for .opera, .netscape etc. The known compatible agent names are “opera”, “msie”, “safari”, “firefox”, “netscape” and “mozilla”. If another browser happens to pass the compatibility tests (by supporting regExp and DOM, and not being a known incompatible browser) then you get whatever it uses as its agent name.

GClientGeocoder

Implements calls to the Google Geocoder.
Constructor new GClientGeocoder(gcache, key, client, channel). The parameters are optional.

If the first parameter is present it specifies the GGeocodeCache or GFactualGeocodeCache to be used. If omitted, a new GFactualGeocodeCache is created.

If the second parameter is present it specifies a key to be used for geocoding. This key is only used if the API code itself was loaded without a key.

Methods
getAddresses(glatlng,callback) undocumetned Sends a reverse geocode request to the server.
Returns a structure similar to that returned by .getLocations(). If the request fails, it returns a structure containing an error code. (Now that the server is switched on, this works in versions from v2.98)
getAddressInBounds(glatlngbounds,callback) undocumetned Sends a reverse geocode request to the server.
Returns a structure similar to that returned by .getLocations(), but containing a single Placemark. Presumably the Placemark that best fits the size of the bounds of those returned by a reverse geocode request on the bounds centre.
getCache() Returns a reference to the cache being used.
getLatLng(address,function) Passes a GLatLng to the function that identifies the location that most closely matches the address. If no address is found, “null” is passed to the function. (From v2.131a, getLatlng() also accepts a GLatLng as the first parameter, and returns the GLatLng of the nearest geocodable location).
getLocations(address or latlng,function) Attempts to geocode the address or reverse geocode the latlng. and passes an anonymous structure containing reply details to the function. (Reverse geocoding using getLocations() works in versions from v2.131a)
reset() Resets the geocoder and clears its cache entries.
setCache(gcache) Changes the cache being used by the geocoder. If the parameter is omitted, caching is switched off.

Reverse geocoded locations

The reverse geocoder seems to have two modes: street mode and town mode.

If your GLatLng is within about 100 metres of an addressable street known to the database, then the returned information is for the street address. If your GLatLng is more than about 100 metres from a known street address, then the returned information is for a nearby town, which could be tens of kilometres away.

Note that reverse-geocodable addresses are not the same as street locations known to GDirections. Roads that have no properties, such as country lanes and interstates, may have only one reverse-geocodable address along their entire length.

For example, reverse geocoding (28.48282,-82.04569) returns you the correct street name, “N Grade Rd, Webster, FL 33597, USA” but the returned coordinates are over 4 kilometers away. The nearby point (28.48400,-82.04697) is over 100 metres from “N Grade Rd” so it returns “Sumter South, Florida, USA” which is over 21 kilometres away.

GControl()

Creates a “control” structure, such as GMapTypeControl() or GLargeMapControl().
It is possible to create your own “control” structures with it, by applying your own methods.
Constructor new GControl(a,b);
a bool Set this true if the control structure is to be included when the map is printed.
If false or omitted, the structure is given the attribute class=”gmnoprint”.
b bool Set this true if the control structure is “selectable” (?).
Methods
clear() undocumented ?????
copy() undocumented Returns a copy of this GControl
getDefaultPosition() Set this to a function that returns the default position of your control structure as a GControlPosition() object.
initialize(a) Set this to a function that creates your control structure.
The optional parameter can be anything you want, just pass a suitable value when you use map.addControl() on it.
printable() Returns the first bool value you set in the constructor
selectable() Returns the second bool value you set in the constructor
GControlPosition()

Can be used to control the placement of GControl() objects.
Constructor new GControlPosition(anchor,offset);
anchor integer Specifies a corner of the map. Use one of the G_ANCHOR_BOTTOM_LEFT type variables.
offset GSize() Specifies the distance of the nearest point of the control div from the specified corner.
Methods
apply(element) Applies style attributes to an element that cause it to be positioned in the specified location. The element need not necessarily be the div of a GControl() object.
example
Suppose we have any HTML element with the attribute id=”message”. It can be positioned near the top left corner of the map by using

var pos = new GControlPosition(G_ANCHOR_TOP_LEFT, new GSize(100,10));
pos.apply(document.getElementById(“control”));
document.getElementById(“map”).appendChild(document.getElementById(“control”));
This simply positions the element on top of the map. It doesn’t turn it into a GControl(). Info windows will not attempt to avoid passing underneath it.
GCopyright

Stores the copyright texts for a region and range of zoom levels.
Constructor GCopyright(id, bounds, minZoom, text)
id integer Each GCopyright object must have a different id.
bounds GLatLngBounds Specifies the region of the map to which the copyright applies.
minZoom integer Specifies the lowest zoom level to which the copyright applies.
text string The copyright text to be displayed.
maxZoom integer Specifies the highest zoom level to which the copyright applies.
f boolean I’m not sure what this does

properties and methods GCopyright has no accessible properties or methods.

GCopyrightCollection()

Holds all the GCopyright() objects that are related to a particular GTileLayer().
This initially starts off empty, but whenever the map changes to display a region where the information has not been collected, a new GAddCopyright() object will be fetches from the server and added to the collection.
Constructor new GCopyrightCollection(prefix)

parameters
prefix text Text to appear in the copyright string before the name of the copyright owner.
methods
addCopyright(gcopyright) Adds information from a GCopyright object to the collection.
getCopyrightNotice(latlngbounds,zoom) Returns a string containing the assembled copyright notice for the specified region and zoom level.
getCopyrights(latlngbounds, zoom) Returns an array of copyright strings that apply to the specified region and zoom level.
GDirections()

Constructor new GDirections(map, sidebar)
Both paramters are optional.

If the first parameter is present, then the route will be plotted on the map as a polyline with start and end markers, and the map will be centred and zoomed to fit the route. (You don’t need to have previously performed map.setCenter().)

If the second parameter is present, then the route information will be appended to that HTMLElement, just like they are in the sidebar on maps.google.com.

If both parameters are used, then clicking on the entries in the sidebar will cause blowups to be shown on the map.

Methods
load(query,options) This is the Method that does all the hard work.
The first parameter is a string in the format “from: address to: address …”, e.g. “from: Chicago to: Pittsburgh to: New York”
The second parameter contains options
Note:GDirections.load() is asynchronous.
loadFromWaypoints(array,options) The same as .load() except that the first parameter is an array of locations, e.g. [“Chicago”, “Pittsburgh”]
clear() Removes the direction information, removes the overlays, clears out the sidebar info.
getBounds() returns a GLatLngBounds that bounds the directions
getCopyrightsHtml() returns a HTML string containing the copyright associated with the directions.
getDistance() returns an Object that contains the distance information
.getDistance().html is a HTML string that describes the distance in suitable units
.getDistance().meters is a number indicating the distance in metres
getDuration() returns an Object that contains the duration information
.getDuration().html is a HTML string that describes the duration in suitable units
.getDuration().seconds is a number indicating the estimated duration in seconds
getGeocode(n) returns an Object that contains Geocode information about the start and end points.
.getGeocode(n).AddressDetails contains the address details returned from the geocoder
.getGeocode(n).Point contains the coordinates as three entries in an array: longitude, latitude and altitude
.getGeocode(n).address is a string containing the parsed address
.getGeocode(n).id – I don’t know what this does.
getMarker(n) returns a reference to the start or end marker
getNumGeocodes() returns the number of geocodes
getNumRoutes() returns the number of routes (each waypoint adds an additional route)
getPolyline() returns a reference tot he polyline
getRoute(n) returns a GRoute Object
getStatus() returns an Object that contains the completion status
.getStatus().code returns the status code. 200=success. The error codes are the same as the error codes for geocoding.
.getStatus().request always seems to return “directions” even if the error obviously occurred in the geocoding.
getSummaryHtml() returns a HTML string containing something like “790 mi (about 12 hours 28 mins)”
Options
avoidHighways bool Set this true to obtain a route that avoids highways
getPolyline bool Instructs the system to return Polyline data. This defaults to true if the GDirections() Object was created with a map parameter.
getSteps bool Instructs the system to return text direstions. This defaults to true if the GDirections() Object was created with a sidebar parameter.
locale string Specifies the language to be used
preserveViewport bool Suppresses the zoom that normally fits the view to the direction results.
travelMode integer Set this to G_TRAVEL_MODE_WALKING to obtain a route that is allowed to do things like walk the wrong way up one-way streets, avoids highways, and walks at lower speeds (which affects the choice of fastest route). It even goes at different speeds uphill and downhill.

GDownloadUrl()

This function will perform the GXmlHttp() processing required to fetch the contents of a text file. The specified file is read asynchronously, and when the read is complete, the data is passed as one long string to specified function.
You could use this to read a plain text data file, and use the String.split() method to split the result.

You could use this to read snippets of HTML code from a server, and drop the whole thing into a side panel

loadPanel = function(a) {
document.getElementById(“sidePanel”).innerHTML = a;
}
GDownloadUrl(“server.php?query=getdetials&id=fred”, loadPanel);
parameters
a string The URL of the file to be loaded.
b function The function to be called when the load has completed.
c string (Optional) Request to be POSTed to the server. If absent, the GET method will be used rather than POST.
d string (Optional) MIME type of the POST request. The default is “application/x-www-form-urlencoded”.
With the GET method, any request data is limited to the 512 bytes that can be appended as parameters to the end of the URL.
With the POST method, large amounts of request data can be sent to the server, and the MIME type can be specified.
GDraggableObject

Constructor new GDraggableObject(HTMLElement, opts)
Options
container HTML Element An element that will act as a bounding box for the draggable object
draggableCursor string The cursor to show on mousover.
draggingCurosr string The cursor to show while dragging.
left Number The left starting position of the object.
top Number The top starting position of the object.
restrictX Boolean undocumented I have no idea what this does.
scroller object of unexposed class undocumented Object that performs the actual drag operation.

Properties
left Horizontal starting position of object
top Vertical starting position of object

Note Setting the .top and .left of a GDraggableObject() will not immediately move the html element. The element will jump to the specified position the next time it starts to be dragged.

Static Methods
getDraggableCursor() Returns a string containing the current draggable cursor setting.
getDraggingCursor() Returns a string containing the current dragging cursor setting.
setDraggableCursor(string) Sets the cursor to be used for subsequent draggable objects
setDraggingCursor(string) Sets the cursor to be used for subsequent draggable objects while they are being dragged

Standard cursors are “auto”, “crosshair”, “default”, “help”, “move”, “pointer”, “text”, “wait”, and in some browsers “hand”.

See Custom Cursors for info about using your own custom cursors.

Instance Methods
disable() Disables dragging
dragging() Returns true if the object is currently being dragged
enable() Enables dragging
enabled() Returns true if dragging is currently enabled
moveTo(see below) Moves the object to the specified location
moveBy(see below) Moves the object by the specified pixel offset

The parameters for .moveTo() in v2.84 to v2.88 were two integers: left, top.
From v2.89 there’s a single GPoint() parameter.

The parameters for .moveBy() in v2.86 to v2.88 were two integers: left, top.
From v2.89 there’s a single GSize() parameter.

GEvent

Handles event registration and triggering.
Here’s a list of the event types that can occur on directly accessible objects.
GCopyrightCollection newcopyright
GMap2 addmaptype, addoverlay, clearoverlays, click, dblclick, drag, dragend, dragstart, infowindowbeforeclose, infowindowclose, infowindowopen, infowindowprepareopen, infowindowupdate, load, maptypechanged, markerload, markerunload, move, moveend, movestart, mousemove, mouseout, mouseover, mousewheel, removemaptype, removeoverlay, resize, singlerightclick, tilesloaded, zoomend, zooming, zoomstart, DOMMouseScroll
GMap [all the GMap2 events], zoom
GMapType newcopyright
GMarker click, changed, dblclick, infowindowbeforeclose, infowindowclose, infowindowopen, infowindowprepareopen, mousedown, mouseout, mouseover, mouseup, remove, updatejson, visibilitychanged
GMarkerManager changed
GPolygon click, remove, visibilitychanged
GPolyline click, remove, visibilitychanged
GTileLayer newcopyright
GKeyboardHandler moveend, movestart
GInfoWindow animate, closeclick, maximizeclick, maximizeend, restoreclick, restoreend
anything clearlisteners
document logclick
GDraggableObject click, dblclick, drag, dragend, dragstart, mousedown, mouseup, move
GLargeMapControl zoomto
GGeoXml load, refreshpointhook
GStreetviewPanorama drivingdirectionsinfo

GEvent.addDomListener() Adds an event listener to a HTML element.
parameters
a object The html element on which the events may occur, e.g. document.getElementById(“button”)
b string The name of the event, e.g. “click” or “moveend”
c function A function to handle the event. Can be an anonymous function or a function name.

GEvent.addListener() Adds an event listener.
parameters
a object The object on which the events may occur, e.g. a marker or the map
b string The name of the event, e.g. “click” or “moveend”
c function A function to handle the event. Can be an anonymous function or a function name.

GEvent.bind() Binds the given method of the given object to the given source event
parameters
a object The object on which the events may occur, e.g. a marker or the map
b string The name of the event, e.g. “click” or “moveend”
c object The object which will be the “this” when the method is called
d method A method to handle the event

GEvent.bindDom() Binds the given method of the given HTML Element to the given source event
parameters
a object The HTML Element on which the events may occur, e.g. document.getElementById(“button”)
b string The name of the event, e.g. “click” or “moveend”
c object The object which will be the “this” when the method is called
d method A method to handle the event

GEvent.callback() Returns a function that calls the second parameter as a method of the first parameter.
parameters
a object the object to which the method is to be applied
b function the function to be used as a method of the object

GEvent.callbackArgs() Returns a function that calls the second parameter as a method of the first parameter.
parameters
a object the object to which the method is to be applied
b function the function to be used as a method of the object
Any additional parameters are passed to the method

GEvent.clearInstanceListeners() Removes all listeners on a specified object.
parameters
a object The object on which the events may occur, e.g. a marker or the map

GEvent.clearListeners() Removes all listeners of a specified type on a specified object.
parameters
a object The object on which the events may occur, e.g. a marker or the map
b string The name of the event, e.g. “click” or “moveend”

GEvent.clearNode() Removes all listeners on a specified object and those on its child nodes.
parameters
a object The object on which the events may occur, e.g. a marker or the map

GEvent.removeListener() Removes a named listener.
parameters
a listener The listener to be removed. Use the token that was returned from the GEvent.addListener() call

GEvent.trigger() Triggers an event.
parameters
a object The object on which the events is to be triggered, e.g. a marker or the map
b string The name of the event, e.g. “click” or “moveend”
Any additional parameters are passed tot he event handler function.
GFactualGeocodeCache

Stores Geocode information.
Constructor new GFactualGeocodeCache()

It is the same as the GGeocodeCache class, except that its .isCacheable() method performs stricter tests.

GGeocodeCache

Stores Geocode information.
Constructor new GGeocodeCache()

Methods
get(address) Returns the reply that was stored for this address.
isCacheable(reply) Returns true if the GClientGeocoder.getLocations() reply should be cached.
put(address,reply) Stores the address and its reply in the cache, if the reply is cacheable.
reset() Erases the contents of the cache.
toCanonical(address) Returns the address in “canonical” form, using standardized punctuation and lower case.
GGeoXml

Renders a KML or GeoRSS file as a map overlay.
Constructor
GGeoXml accepts an indefinite number of parameters, which include:

parameters
url string URL of KML or GeoRSS file
The file must be placed on a webhost where the Google server can read it
callback function Function to be called when processing is complete
sideBarHandler function undocumented Function to be notified of the structure and contents of the items added
opts options object undocumented I don’t know what options are available.
Use map.addOverlay() to add the overlay to the map.

methods
copy() Returns a new GOverlay that is a copy of this one.
initialize() Used by map.addOverlay() to set up the overlay.
redraw() The overlay is redrawn.
remove() Used by map.removeOverlay() to recover memory.
supportsHide() Returns false, thus indicating that the overlay does not support .hide(), .show() and .isHidden()
getDefaultBounds() Returns a GLatLngBounds that contains all the objects added.
getDefaultCenter() Returns a GLatLng at the centre of those bounds.
getDefaultSpan() Returns a GLatLng. The coordinates of the GLatLng represent the width abd height of those bounds.
getTileLayerOverlay() Returns the tile layer overay that GGoeXml has used, if there is one. Otherwise returns null.
gotoDefaultViewport() Sets the viewport to fit the objects added
hasLoaded() Returns true if the loading is complete
loadedCorrectly() Returns true if the XML file loaded correctly (only meaningful if .hasLoaded() is true)
hide() Hides all the child overlays that support .hide() .
show() Unhides all the child overlays that support .hide() .
isHidden() Returns true if currently hidden by .hide()
supportsHide() Returns true

Extra overlay properties

GGeoXml can add extra properties to the overlays that it creates. They are all undocumented. Note that not all overlays have all these properties. They always seem to have description, snippet and name but the presence of other properties varies. It’s possible that you either get hiddenInStream or (parentGeoXml and parentFolderForCallbackOverlayAddTimeout) I’m not sure about that.
description text from the <description> field in the KML
name text from the <name> field in the KML
snippet text from the <snippet> field in the KML
hiddenInStream boolean: I don’t know what this does
parentFolderForCallbackOverlayAddTimeout Integer: I don’t know what this does
parentGeoXml pointer to the parent GEoXml object
GGroundOverlay

Renders an image file as a map overlay.
Constructor new GGroundOverlay(url, latlngbounds, opts)

Use map.addOverlay() to add the overlay to the map.

methods
copy() Returns a new GOverlay that is a copy of this one.
hide() Hides the overlay
initialize(map) Used by map.addOverlay() to set up the overlay.
isHidden() returns true if the overlay is hidden
redraw() Redraws the overlay.
remove() Used by map.removeOverlay() to recover memory.
show() Shows the overlay
supportsHide() Returns true, thus indicating that the overlay supports .hide(), .show() and .isHidden()

The .hide() and .show() methods also exist, but they simply throw a “Interface not implemented” error.

I don’t know what options exist or what they do. The code that handles the opts is particularly obscure.

GHierarchicalMapTypeControl()

A GControl() structure that manages map type switching, typically in the top right corner of the map. Has all the properties and methods of the GControl() class.
Similar to GMapTypeControl() except that it uses a parent/child layout instead of a row of separate buttons.

It additionally accepts an optional parameters.

parameters
tiny bool If present and true, the control will use short names in the map type buttons.

methods
addRelationship(parent, child, name, isDefault) Makes one map type a child of another.
The first two parameters are required references to the parent and child GMapType instances.
The third optional parameter allows you to specify a different name for the child box in the layout.
The fourth optional parameter can be set true to cause the child maptype to be activated when the parent maptype is selected.
removeRealationship(child) Removes the relationship from a child GMapType.
clearRelationships() Clears all the relationships. All GMapTypes become parents.
GIcon()

Constructor new GIcon(gicon, image, label, shadow)
All parameters are optional.
If the first parameter is present, then all properties of that GIcon() object are copied to the new GIcon().

If the second parameter is present, then it is used for the GIcon().image property.
If the fourth undocumented parameter is present, then it is used for the GIcon().shadow property.
E.g. var myIcon = new GIcon(G_DEFAULT_ICON, “mymarker.png”)creates a GIcon() that has the same shape and size as the default icon, but has a different image.

If the third undocumented parameter is present it is used as a “label”
A “label” is an extra image component that lies on top of the main icon image. This feature allows you to build your icon from a background image plus a foreground label. Prior to the introduction of this feature, if you wanted to have markers with different letters and different background colours, you had to create a separate icon image for each combination.
The label is an object of unnamed class that has the following properties:
label undocumented
url This string identifies the URL of the label image file.
size A GSize() object that identifies the pixel size of the label image.
anchor A GPoint() object that identifies the position offset of the label image relative to the main image.
properties
image This string identifies the main image of the marker.
iconSize A GSize() object that identifies the pixel size of the main image.
shadow Optional string that identifies the image to be used for the shadow.
shadowSize A GSize() object that identifies the pixel size of the shadow image.
iconAnchor A GPoint() object which identifies the pixel which will be placed on the specified geographical location. You can think of it as the point that the image points at.
infoWindowAnchor A GPoint() object which identifies the pixel that the tip of the info window stem will touch.
label undocumented (Optional) see above
transparent (Optional) is the name of a transparent image used for capturing clicks and mouseovers in IE.
printImage (Optional) identifies a GIF file to be used for printing.
mozPrintImage (Optional) identifies a GIF file to be used for printing from the Mozilla or Firefox browser.
printShadow (Optional) identifies a GIF file to be used for printing the shadow.
imageMap (Optional) an array of integers representing the “shape” parameters of a HTML ImageMap. Used for capturing marker clicks in non-IE browsers.
imageMapType (Optional) Undocumented specifies the shape type of the ImageMap. Can be “poly”, “circle” or “rect”.
dragCrossAnchor GPoint(): indicates the hot spot of the drag cross image, but with the x coordinate negated. E.g. if you want the anchor point of your image to be the pixel (4,9) then you need to specify “new GPoint(-4,9)”
dragCrossImage String: indicates an image to be used as the drag cross. If you set it to the null string, you get the default drag_cross_67_16.png image.
dragCrossSize GSize(): indicates the size of the drag cross.
maxHeight integer: The maximum difference in height between the marker anchor and the drag cross anchor during dragging. Setting the maxHeight to zero causes it to use the default 13.
sprite Undocumented Object of format {image:string, width:number, height:number}. If it exists, it is used instead of .image and .iconSize
GInfoWindow()

There is only one object in the GInfoWindow class. You can obtain a reference to it via map.getInfoWindow() and then use its methods.
The class itself in no longer exposed, so you can’t create new GInfoWindow() objects.

Properties GInfoWindow has no accessible properties

methods
create(pane1,pane2) undocumented Used by .initialize() to create the divs.
The parameters are references to the panes in which the info window and the shadow are to be placed.
getContentContainers() Returns the array of HTML Elements reprenting the contents of each tab.
getTabs() Returns the array of GInfoWindowTab() objects in this info window
maximize(instant) Expands the infowindow. Only works if the infowindow has a maxUrl or maxContent.
If the undocumented parameter is true, then the large infowindow opens instantly, otherwise an animation is performed.
restore(instant) Contracts an expanded infowindow. Only works if the infowindow has a maxUrl or maxContent.
If the undocumented parameter is true, then the small infowindow opens instantly, otherwise an animation is performed.
getPixelOffset() Returns the pixel offset of the info window
getPoint() Returns a GLatLng indicating the location of the info window
getSelectedTab() Returns a number indicating which tab is selected, counting from zero.
hide() Makes the info window invisible
initialize(map) undocumented Used by the openInfoWIndow methods to create the info window if it does not exist
isHidden() Returns true if the info window is hidden or closed
redraw(force) undocumented Redaws the info window if the parameter is true.
remove() undocumented destroys the info window divs
reset(point, tabs, size, offset, selectedTab) Changes some or all of the info window properties.
The fourth and fifth arguments are optional.
point: a GLatLng() indicating the geographical location.
tabs: array of GInfoWindowTab()s with HTML DOM elements (not HTML text strings) in the contentElem.
size: a GSize() indicating the size of the info window display area. When using .reset(), the API will not automatically calculate the size for you, but will enforce the minimum size if you try to set it smaller.
offset: (optional) a GSize() indicating the pixel offset.
selectedTab: (optional) an integer indicating which tab is selected.
selectTab(i) Activates the specified tab
show() Makes the info window visible
supportsHide() Returns true, thus indicating that the overlay supports .hide(), .show() and .isHidden()
disableMaximize() If the info window is open, removes the “maximize” icon from the info window and disables maximization.
enableMaximize() If the info window is open, displays the “maximize” icon in the info window and enables maximization if the corresponding options are set.
copy() Undocumented Currently does nothing.

GInfoWindowTab()

These are used to hold information about the tabs of tabbed info windows.
Constructor
new GInfoWindowTab(label,contents)

properties
contentElem undocumented HTML elements representing the contents of the info window corresponding to this tab
It must be a HTML DOM element if using .openInfoWindow(), and must be a HTML string if using .openInfoWindowHtml().
name undocumented Text displayed in the tab to identify it
onclick undocumented Possibly an optional function to be called when the tab is clicked.
GKeyboardHandler()

Create one of these if you want your map to respond to keyboard input like Google Local does.
Constructor
new GKeyboardHandler(map,window)

(The second parameter is undocumented)

The GKeyboardHandler has no accessible properties or methods.

GLargeMapControl()

A GControl() object controlling zooming an panning
Has all the properties and methods of the GControl() class.
GLargeMapControl3D()

A GControl() object controlling zooming an panning, using the new “3D” graphics
Has all the properties and methods of the GControl() class.
GLatLng()

Identifies a geographical location.
Constructor new GLatLng(latitude,longitude, nofix)
(Note that the latitude and longitude are in the opposite order from GPoint)
If the optional nofix parameter is absent or false, the latitude is restricted to the range -90 to +90, and the longitude is wrapped round the globe to the value in the range -180 to +180. E.g. (-100,270) would become (-90,-90)

The constructor initially creates the x and y parameters as copies of the hidden parameters that control the location. Changing the values of the x and y parameters does not change the location of the GLatLng object.

Properties
y Latitude expressed in degrees (read only, deprecated)
x Longitude expressed in degrees (read only, deprecated)
Methods
lat() Returns the latitude
lng() Returns the longitude
latRadians() Returns the latitude expressed in radians
lngRadians() Returns the longitude expressed in radians
distanceFrom(latlng, radius of planet) Returns the distance expressed in metres from the specified location.
The second parameter is optional.
equals(latlng) Returns true if the two latlngs identify the same location
toString() undocumented Returns a string in the format “(1.123456789,-1.123456789)”
toUrlValue(n) Returns a string in the format “1.123457,-1.123457”. The values are rounded to n decimal places (default 6).

Static Methods
GLatLng.fromRadians(lat,lng,nofix) undocumented Constructs a GLatLng from radian values instead of degrees
GLatLng.fromUrlValue(string) undocumented Constructs a GLatLng from a string in the format “1.123457,-1.123457”.
GLatLngBounds()

Identifies a rectangular geographical region
Constructor new GLatLngBounds(latlng,latlng)
If two parameters are passed, they are taken to represent the SouthWest and NorthEast corners of the rectangle. The corners must be in the right order for it to work correctly.
If one parameter is passed, the region contains just that point.
If no parameters are passed, the regions is set to the empty region GLatLngBounds(new GLatLng(57.29577951308232, 180), GLatLng(-57.29577951308232, -180)). (The corners are in the wrong order).

All the coordinates are normalized into the range -90 to +90 for the latitudes and -180 to +180 for the longitudes.
properties: GLatLngBounds has no accessible properties

Methods
contains(latlng) Returns true if the bounds contain the location
containsBounds(latlngbounds) Returns true if it fully contains the other bounds
containsLatLng(glatlng) Returns true if it contains the GLatLng
equals(latlngbounds) Returns true if the bounds are equal
extend(latlng) Enlarges the bounds to be the smallest rectangle containing the previous area plus the specified location
getCenter() Returns a GLatLng representing the centre
getNorthEast() Returns a GLatLng representing the NorthEast corner
getSouthWest() Returns a GLatLng representing the SouthWest corner
intersects(latlngbounds) Returns true if the two bounds intersect
isEmpty() Returns true if the bounds specify a negative region (i.e. the corners are specified in the wrong order)
isFullLat() Returns true if the latitude range covers the whole Earth from -90 to +90
isFullLng() Returns true if the longitude range covers the whole Earth -180 to +180
toSpan() Returns a GLatLng object which represents the width and height of the region.
toString() undocumented Returns a string in the format ((33.123, -120.123), (45.123, -100.233)). The values may differ slightly from what you originally specified due to being converted to radians and back to degrees.
Static Methods
GLatLng.fromUrlValue(string) undocumented Constructs a GLatLngBounds from a string which contains four numbers separated by commas. Other punctuation is ignored, so a string with brackets, like that output by .toString(), will also work.
GLayer()

Adds a Panoramio or Wikipedia overlay to the map.
Constructor new GLayer(ID or LMC)

The list of official IDs is at spreadsheets.google.com/pub?key=p9pdwsai2hDN-cAocTLhnag . In additon to the official IDs, there are “com.paroramio.popular” and a few more Wikipedia languages than are officially listed.

It’s also possible to use an LMC instead of an ID. The only available LMC that I lnow of that doesn’t have an ID is “lmc:panoramio/1”. Use map.addOverlay() to add the overlay to the map.

methods
initialize(map) Used by map.addOverlay() to set up the overlay.
hide() Hides the layer
redraw(bool) Redraws the overlay.
remove() Used by map.removeOverlay() to recover memory.
show() Shows a hidden layer
setParameter() undocumented I don’t know what this does

static methods
addInitializer() undocumented I don’t know what this does
isHidden(ID) Returns true if the specified layer is hidden
GLoad()

undocumented
This function is used during the API loading sequence, to load the API.

GLoadMapsScript()

undocumented
This function is used during the API loading sequence to load the selected API Javascript file.

GLog()

A system that allows debugging information to be displayed.
The GLog() methods are all static. You call them like ‘GLog.write(text);’ rather than using ‘var log = new GLog(); log.write(text)’
methods
write(txt,colour) Writes the text to a log window that appears at the bottom of the screen.
The optional colour parameter can be a string containing a colour specification, like “blue” or “#FF8888”.
writeHtml(txt) Writes the text to a log window that appears at the bottom of the screen, applying any HTML formatting.
writeUrl(txt) Writes the text to a log window that appears at the bottom of the screen, formatted as a clickable link.
getMessages() undocumented Returns an array of strings containing the text of all messages perviously written.
GMap()

A Gmap() object is a GMap2() object with a few extra methods layered on top, to provide backward compatibility.
Constructor new GMap(a,b,c,d)

parameters
a html element The map container, usually a <div>
b[ ] array of maptypes (optional) list of map types allowed on this map
c integer (optional) Width of map
d integer (optional) Height of map
properties GMap() has no accessible properties

additional methods
centerAndZoom(point,zoom) Centres and zooms the map
centerAtLatLng(point) Centres the map
getBoundsLatLng() Returns a GBounds() object identifying the map bounds.
getCenterLatLng() Returns a GPoint() identifying the centre
getSpanLatLng() Returns a GSize() identifying the width and height of the map in lng and lat degrees
getZoomLevel() Returns the APIv1 type zoom level.
Note that this can be a negative value when the new deep v2 zoom levels are active.
openInfoWindowXslt() Does nothing
recenterOrPanToLatLng(point) Centres the map, doing a fluid pan to the point if it is within the current viewport
zoomTo(zoom)
overwritten methods These methods overwrite the GMap2() methods of the same name
setMapType(a) Sets the map type. The parameter is a GMapType() object.
openInfoWindow(a,b,c,d,e) Opens the info window, see below for parameters
openInfoWindowHtml(a,b,c,d,e) Opens the info window, see below for parameters
Modified Event Returns
zoomend oldZoom, newZoom (using APIv1 zoom level syntax)
GMap2()

Constructor new GMap2(container,opts)
parameters
container html element The map container, usually a <div>
opts (optional)Anonymous object may contain more information

opts If you want to set up any of the other internal properties of your GMap2() you have to bundle them into an anonymous object. The constructor copies the named properties of this anonymous object into the hidden internal properties of the GMap2. E.g.

var map = new GMap2(document.getElementById(“map”),{mapTypes:[G_SATELLITE_TYPE]});
option type purpose
draggableCursor string Specifies a cursor to use when the map is draggable
draggingCursor string Specifies a cursor to use when the map is being dragged
googleBarOptions options object Specifies a set of options to be applied to the Google Bar, if present
logoPassive string undocumented Set true to make the Google Logo unclickable.
mapOrderMarkers function(GMarker,GMarker) returning an integer undocumented The API will use this as an “order function” in an Array.sort() call, to sort its internal array of markers.
The function should return a negative or positive value depending on whether the first GMarker is to be sorted before or after the second GMarker.
I have no idea why you might want to do this.

mapTypes Array of GMapType()s List of map types allowed on this map
noResize bool undocumented Suppresses “resize” events
size GSize() Size of map
suppressCopyright bool undocumented Set true to suppress the copyright message (e.g. for overview maps and blowup maps)
usageType string undocumented Possible values are “o” for overview maps and “p” for blowup maps.
Standard cursors are “auto”, “crosshair”, “default”, “help”, “move”, “pointer”, “text”, “wait”, and in some browsers “hand”.

See Custom Cursors for info about using your own custom cursors.

googleBarOptions

The possible entries in the googleBarOptions are:
option type purpose
linkTarget string Use one of these string variables to control the link target pane G_GOOGLEBAR_LINK_TARGET_BLANK, G_GOOGLEBAR_LINK_TARGET_PARENT, G_GOOGLEBAR_LINK_TARGET_SELF, G_GOOGLEBAR_LINK_TARGET_TOP
resultList string Use one of these string variables to control result list suppression G_GOOGLEBAR_RESULT_LIST_INLINE, G_GOOGLEBAR_RESULT_LIST_SUPPRESS
onGenerateMarkerHtmlCallback function Function to be called when the info window is about to be opened on one of the results. Must return the (modified) html string to be used for the info window contents.
onIdleCallback function Function be be called when the GoogleBar finishes searching
onMarkersSetCallback function Function to be called after the markers have been placed on the map.
onSearchCompleteCallback function Function to be called when the search is complete, before the reults are plotted
showOnLoad bool If true, the Google Bar will be expanded when the map has loaded.
suppressInitialResultSelection bool If true, the info window is not opened on the firest result.
suppressZoomToBounds bool If true, the map does not zoom and pan to fit the results.

methods
addControl(control,controlposition) Causes the GControl() object to be added to the map If a GControlPosition() is not specified, the getDefaultPosition() is used.
addMapType(maptype) Adds a map type to the map
addOverlay(overlay) Causes the overlay to be added to the map.
checkResize() Checks to see if the map container has changed size, and if so resizes the map
clearOverlays() Removes all overlays except GTileLayerOverlay()s.
closeInfoWindow() Closes the info window
continuousZoomEnabled() Returns true if “continuous zoom” animations are enabled.
disableContinuousZoom() Disables the “continuous zoom” animations.
disableDoubleClickZoom() Causes double-click to just centre the map.
disableDragging() Disables map dragging
disableGoogleBar() Removes the Google Bar
disableInfoWindow() Disables the info window
diablePinchToZoom() Disables the Pinch-to-zoom feature on multitouch capable devices.
disableScrollWheelZoom() Disables the scroll wheel zoom.
doubleClickZoomEnabled() Returns true if double click zoom is enabled.
draggingEnabled() Returns true if map dragging is enabled.
enableContinuousZoom() Enables the “continuous zoom” animations – zooming in or out by one level is then amimated.
enableDragging() Enables map dragging.
enableDoubleClickZoom() Causes double-click to zoom in by one level and centre the map.
enableInfoWindow() Enables the info window
enableGoogleBar() Activates a Google Bar on top of the Google Logo
enablePinchToZoom() Enables the Pinch-to-zoom feature on multitouch capable devices.
enableScrollWheelZoom() Enables the scroll wheel zoom.
focus() Undocumented If the info window is open, returns its location as a GLatLng().
fromContainerPixelToLatLng(point) Converts a container pixel to a GLatLng()
fromDivPixelToLatLng(latlng,nofix) Converts a “dragObject” div pixel to a GLatLng()
If the optional second undocumented parameter is true, then the output is not normalized.
Note: The values for ContainerPixel and DivPixel are initially the same, but the div moves when the map pans and the container doesn’t. Markers keep the same DivPixel position when the map moves, and only get a new value when it zooms.

fromLatLngToContainerPixel(latlng) Converts a GLatLng() to a pixel relative to the map container.
fromLatLngToDivPixel(latlng,point) Converts a GLatLng() to a “dragObject” div pixel
The optional second parameter is for resolving normalization ambiguities. When zoomed out, the same latlng position can be present on more than one tile. Without the second parameter, the copy nearest the centre is chosen. If the second parameter is present, its .x value controls which copy is chosen.
getBounds() Returns a GLatLngBounds which indicates the bounds of the region covered by the map.
getBoundsZoomLevel(latlngbounds) Returns the number of the deepest permitted zoom level of the current map type which is large enough to contain the specified region.
getCenter() Returns a GLatLng() indicating the centre point of the map.
getContainer() Returns a reference to the map <div>
getCurrentMapType() Returns a reference to the current GMapType()
getDefaultUI() Returns the default User Interface for this map.
.getDragObject() Returns a reference to the special GDraggableObject that contains all the parts of the map that move when the map pans: the map tiles and overlays, but not the map controls.
All the properties and instance methods of GDraggableObject are accessible.
.getEarthInstance(callbackfn) Obtains the instance of the Google Eath Plugin. The instance reference is returned to the callback function.
Posessing the instance reference allows Google Earth API calls to be performed on the Google Earth maptype within Google Maps. For example this call makes the Google Map “borders” layer visible.

map.getEarthInstance(function(earth) {
earth.getLayerRoot().enableLayerById(earth.LAYER_BORDERS, true);
});
getInfoWindow() Returns a reference to the info window object.
getMapTypes() Returns an array of GMapType()s that are allowed on this map.
getPane(i) Returns a reference to one of the map panes.
The draggable part of the map contains seven html <div> elements referred to as “panes”. Different types of map elements are placed in different panes, e.g. the map tiles are placed in the lowest pane, markers are placed on a higher plane.
The values G_MAP_MARKER_SHADOW_PANE, G_MAP_MARKER_PANE, G_MAP_FLOAT_SHADOW_PANE, G_MAP_MARKER_MOUSE_TARGET_PANE, G_MAP_FLOAT_PANE can be used to specify a specific pane.

getSize() Returns a GSize() object indicating the size of the map in pixels.
getZoom() Returns the current zoom level number.
hideControls() undocumented Hides all hideable controls. The Logo, copyright and Terms are not hideable, all other controls are hideable.
infoWindowEnabled() Returns true if the info window is enabled
infoWindowSizeWatcher() undocumented This has something to do with GGeoXml.
isLoaded() Returns true if the map has a map type.
When initially created, a map has no map type. It will be given a map type the first time that setCenter() or setMapType() or setZoom() is used.
openInfoWindow(a,b,c) Opens the info window, see below for parameters
openInfoWindowHtml(a,b,c) Opens the info window, see below for parameters
openInfoWindowTabs(a,b,c) Opens the info window, see below for parameters
openInfoWindowTabsHtml(a,b,c) Opens the info window, see below for parameters
panBy(gsize) Pans the map by the specified number of pixels in the x and y directions.
panDirection(a,b) Pans in the direction specified by (a,b)
e.g. map.panDirection(2,-1) causes the screen to pan two units North and one unit West
Each pan unit is equal to half a screen.
panTo(a) Recentres or pans to the specified GLatLng() position
pinchToZoomEnabled() Returns true if the Pinch-to-zoom feature for multitouch capable devices is enabled.
removeControl(a) Removes a GControl(). The parameter is the token returned from addControl()
removeMapType(maptype) Removes a map type
removeOverlay(a) Removes an overlay.
returnToSavedPosition() Resets the map to the values saved by map.savePosition()
savePosition() Saves the map centre and zoom level information which gets used when the user clicks on the “Return to last result” icon
scrollWheelZoomEnabled() Returns true if the scroll wheel zoom is enabled.
setCenter(a,b,c) If “a” is present, it is a GLatLng() specifying the new map centre.
If “b” is present, it is n integer specifying the new zoom level.
If “c” is present, it is a GMapType() specifying the new map type.
All three parameters are optional.
setUI(gmapuioptions) Activates the specified User Interface.
setUIToDefault() Activates the default User Interface for this map.
setFocus(latlng,force) undocumented Normally when you zoom in or out, the centre point stays in a fixed location on the screen. setFocus(latlng) changes this behaviour so that the specified point is the one that remains in a fixed location. If a zoom animation is in progress, then setFocus is ignored unless the second parameter is set true.
setFocus() with no parameters changes things back to the default behaviour.
setMapType(a) Sets the map type. The parameter is a GMapType() object.
setZoom(a) Sets the zoom level. The parameter is an integer.
showControls() undocumented Makes hidden controls visible.
showMapBlowup(a,b) Opens the info window with a blowup maplet, see below for parameters
zoomIn(latlng,bool,bool) Zooms in by one zoom level
If the first undocumented parameter is present and the second parameter is present and true, then the map is centred at the specified GLatLng
If the first undocumented parameter is present and the second parameter is absent or false, then the map centre is shifted in such a way that the specified GLatLng remains in the same position relative to the map container
If the third undocumented parameter is present and set to true, then an animated zoom is performed if continuous zoom is enabled.
zoomOut(latlng,bool) Zooms out by one zoom level
If the first undocumented parameter is present then the map centre is shifted in such a way that the specified GLatLng remains in the same position relative to the map container
If the second undocumented parameter is present and set to true, then an animated zoom is performed if continuous zoom is enabled.
updateCurrentTab(modifier function, onupdate function) Updates the currently selected info window tab, causing a resize of the info window, without repositioning. The modifier function is used to modify the currently selected tab and is passed a GInfoWindowTab as an argument.
updateInfoWindow(tabs, onupdate function) Updates the content of the currently open info window, without repositioning. The info window is resized to fit the new content.
Event Returns
addmaptype maptype
addoverlay overlay
clearoverlays none
click overlay, latlng
dblclick overlay, latlng (the first parameter is always null)
drag none
dragend none
dragstart none
infowindowbeforeclose none
infowindowclose none
infowindowopen none
load none
maptypechanged none
move none
moveend none
movestart none
mousemove latlng
mouseout latlng
mouseover latlng
removemaptype maptype
removeoverlay overlay
resizeundocumented none
singlerightclick latlng, src, overlay
zoomend oldZoom, newZoom
zoomingundocumented none
zoomstartundocumented direction (+1=in, -1=out), latlng pivot, bool recentering
openInfoWindow() Methods

There are a set of 15 methods for opening info windows, 5 methods each for GMap(), GMap2() and GMarker() objects. Some of the methods are inherited by the GMap() class from the GMap2() class, and some are overwritten with different parameters.
I’m documenting them all in one chunk here, rather than repeating all the details 15 times.

The different methods take slightly different parameters. Chosen from this list:
point GLatLng() Geographical location.
htmlElem HTML DOM element Info Window contents expressed as a DOM Element.
htmlStr HTML string Info Window contents expressed as a string.
tabElemArray array of GInfoWindowTab()s One for each tab, with a HTML DOM element in the contentElem
tabStrArray array of GInfoWindowTab()s One for each tab, with a HTML string in the contentElem
offset GSize() (Optional) Pixel offset from the point.
selectedTab integer (Optional) Specifies the number of the tab to be initially selected. Counting from zero. If omitted, tab zero is selected.
maxWidth integer (Optional) (Possibly) Maximum width that can be considered for info window contents size calculations.
If omitted, the screen.width is used.
The height calculations go wrong if this is set less than 217, the minimum infoWindow contents width.
openFn function (Optional) Function to be called when the info window opens.
closeFn function (Optional) Function to be called when the info window closes.
opts anonymous object (Optional) may contain some or all of the following object properties:
selectedTab: integer
maxWidth: integer
noCloseOnClick: boolean
onOpenFn: function
onCloseFn: function
zoomLevel: integer
mapType: GMapType()
maxContent: string
maxTitle: string
pixelOffset: GSize()
undocumented maxHeight: integer
undocumented autoScroll: boolean
undocumented onPrepareOpenFn: function
undocumented onBeforeCloseFn: function
undocumented suppressMapPan: boolean
undocumented limitSizeToMap: boolean
undocumented contentSize: GSize
undocumented noClearOnClose: boolean
undocumented noCloseBeforeOpen: boolean
undocumented onCloseClick:function
undocumented onMaximizeClick:function
undocumented onRestoreClick:function
undocumented buttons: See below
for example: {pixelOffset:new GSize(32,5), maxWidth: 540}
Note: The onOpenFn, onPrepareOpenFn, onCloseFn and onBeforeCloseFn options only work for the map methods. When using marker.infoWindowOpen*(), those options are hijacked and replaced by calls to API internal functions that throw the corresponding events on the marker.

zoom integer (Optional) Zoom level for the contained map.
maptype GMapType() (Optional) Map type for the contained map

The individual methods take the following parameters:

GMap2().openInfoWindow(point,htmlElem, opts)
GMap2().openInfoWindowHtml(point, htmlStr, opts)
GMap2().openInfoWindowTabs(point, tabElemArray, opts)
GMap2().openInfoWindowTabsHtml(point, tabStrArray, opts)

GMap().openInfoWindow(point, htmlElem, offset, openFn, closeFn)
GMap().openInfoWindowHtml(point, htmlStr, offset, openFn, closeFn)
GMap().openInfoWindowTabs(point, tabElemArray, opts)
GMap().openInfoWindowTabsHtml(point, tabStrArray, opts)

marker.openInfoWindow(htmlElem, opts)
marker.openInfoWindowHtml(htmlStr, opts)
marker.openInfoWindowTabs(tabElemArray, opts)
marker.openInfoWindowTabsHtml(tabStrArray, opts)

GMap2().showMapBlowup(point, opts)
GMap().showMapBlowup(point, zoom, maptype, offset, openFn, closeFn)
marker.showMapBlowup(opts)

In addition there is GMap().openInfoWindowXslt() and marker.openInfoWindowXslt(). These methods do nothing. They do not open an info window. They exist only so that maps written using this documented v1 syntax don’t crash.

openInfoWindow() {buttons} option

Controls the display of the info window buttons.
It’s a bit complicated, because there are three layers of options:

The {buttons} option itself
The options for specifying the four types of button: close, maximise, restore and fullscreen
The options for specifying the details of each button.
For example
marker.openInfoWindowHtml(html, {buttons:{close:{height:16,width:5}}});
moves the close button up nearer the corner of the info window.
The syntax allows for lots of different button details to be set, but many of them get countermanded by the API. The only ones that you can actually change are

width:
height:
padding:
show:
width: height: and padding: accept integers which control the position of the button.
The show: option is bit coded, except that show:0 has a special meaning

show:0 show in all situations
show:1 not used in the API
show:2 show when the info window is normal
show:4 not used in the API
show:8 show when the info window is maximised
show:16 not used in the API (info window is full screen)
For example, the close button is typically available all the time, so that’s {show:0}. The restore button is typically only available if the window has a maxUrl and is currently either maximised or full screen, so that’s {show:24}. The maximize button will only show if the infoWindow also has maxUrl, maxConetnt or maxTitle (in earlier releases, this could be controlled via the “group” option but that now gets countermanded).
If you cause a button to be displayed in an inappropriate context, e.g. the restore button in a non-maximized info window, then the button will do nothing. So the options are really only useful for adjusting the positions of the buttons and for switching them off (e.g. switching off the restore button so that the user can’t switch back to the non-maximized info window).

The details of this option have changed from time to time. If you do use it, I recommend locking in to a specific release of the API code, so that if the syntax changes in later releases it won’t affect your page.

GMapType()

Holds the information about a map type.
Constructor new GMapType(tileLayers, projection, name, opts)
parameters
tilelayers An array of GTileLayer() objects
projection A reference to the projection function, e.g. new GMercatorProjection(22)
name The long name for the map type
opts (optional)An anonymous object which may contain more information

opts If you want to set up any of the other internal properties of your GMapType() you have to bundle them into an anonymous object. The constructor copies the named properties of this anonymous object into the hidden internal properties of the GMapType.

option purpose default
shortName Name to be used if GMapTypeControl() is in “tiny” mode “”
urlArg A string which can be used to identify the map type. It can be used to link copyright information to map types. “c”
maxResolution Maximum zoom level supported The highest zoom level supported by any of the GTileLayers
minResolution Minimum zoom level supported The lowest zoom level supported by any of the GTileLayers
textColor the text colour to by used for any text drawn above the map (e.g. the copyright text, and the numbers in GScaleControl). Can use a named colour, like “black”, or a hex value like “#ffffff”. “black”
linkColor the text colour to be used for any links that are drawn above the map (e.g. “Terms of Use”). It can use a named colour, like “black”, or a hex value like “#ffffff”. “#7777cc”
tileSize an integer that specifies the size of the tiles. Tiles are always square. 256
errorMessge a string containing the error message to be used if no tile can be served. “”
alt a string containing the tooltip text to be used in the GMapTypeControl. “”
radius Radius of planet (not currently used) defaults to 6378137 “”
enableZoomLevelLimits ???? “”
properties
PIXEL_MARGIN Margin to be added when using getSpanZoomLevel. Defaults to 3 pixels.
methods
getBoundsZoomLevel(latlngbounds,viewsize) Returns the highest supported zoom level for which the latlngbounds will fit in the specified viewsize.
getErrorMessage() Returns a string containing the error message to be used if no tile can be served.
getLinkColor() Returns the text colour to be used for any links that are drawn above the map (e.g. “Terms of Use”). It can use a named colour, like “black”, or a hex value like “#ffffff”.
getMaximumResolution(a) Returns the number of the highest Zoom level that the map type supports. The function is coded to accept an optional parameter, but that parameter is always void.
getMinimumResolution() Returns the number of the lowest Zoom level that the map type supports.
getName(bool) Returns the name to be used in GMapTypeControl(). If the optional parameter is present and true, returns the short name to be used on tiny maps.
getProjection() Returns the GProjection() object associated with the map type.
getSpanZoomLevel(latlng,latlng,viewsize) Returns the highest supported zoom level for which a map centred at the first latlng will have a span greater than or equal to that specified by the second latlng plus the PIXEL_MARGIN. If no supported zoom level achieves that, it will return zero, even if that’s not supported by this map type.
getTextColor() Returns the text colour to by used for any text drawn above the map (e.g. the copyright text, and the numbers in GScaleControl). Can use a named colour, like “black”, or a hex value like “#ffffff”.
getTileLayers() Returns an array of GTileLayer() objects. A map type can have more than one layer (as does G_HYBRID_MAP)
getTileSize() Returns an integer that specifies the size of the tiles. Tiles are always square.
getUrlArg() Returns a (one-character) string which can be used to identify the map type. It is used to identify the map type in the &t= parameter of Google Local.
getAlt() Returns the alternate text associated with the map type button for this map type
GMapTypeControl()

A GControl() structure that manages map type switching, typically in the top right corner of the map.
Has all the properties and methods of the GControl() class.
It additionally accepts an optional parameter.
parameters
a bool If present and true, the control will use short names in the map type buttons.
GMapUIOptions()

A GMapUIOptions() object holds details about a set of user interface options.
Constructor
new GMapUIOptions(gsize)

If the parameter is omitted, the returned GMapUIOptions has no properties (the “controls”, “maptypes” and “zoom” properties must then be added before it can be used in a map.setUI() call).

If the gsize parameter is present, then the default UIOptions for a map of the specified size is returned.

properties
controls specifies the map controls to be displayed. The options are: {largemapcontrol3d}, {smallzoomcontrol3D}, {maptypecontrol}, {menumaptypecontrol}, {scalecontrol} each of which are boolean
keyboard (optional) boolean
maptypes specifies the maptypes to be used.The options are: {hybrid}, {normal}, {physical}, {satellite} each of which are boolean
zoom specifies whether double clicks or scroll wheel movements zoom the map.The options are: {doubleclick}, {scrollwheel} each of which are boolean
E.g.

var ui = new GMapUIOptions();
ui.maptypes = {normal:true, physical:true}
ui.zoom = {};
ui.controls = {largemapcontrol3d:true};
ui.keyboard = false;
map.setUI(ui);
GMarker()

A GMarker() object plots an icon at a specified point on a map.
Constructor format 1 new GMarker(point, icon, inert) deprecated
point GLatLng() Specifies the geographical location where the marker is to be plotted.
icon GIcon() (Optional) Icon to be plotted. If omitted, G_DEFAULT_ICON is used.
inert bool (Optional) If true, the .clickable property is set false.

Constructor format 2 new GMarker(point, opts)
point GLatLng() Specifies the geographical location where the marker is to be plotted.
opts (optional)Anonymous object may contain more information

opts You can use either format for the GMarker constructor. The “draggable” option can only be set using format 2.

E.g. var marker = new GMarker(point, {icon: myIcon, draggable:true});

option type purpose
autoPan boolean Set false to disable map autopanning when this marker is dragged to the edge of the map.
bouncy boolean Set false to disable the silly bounce animation of draggable markers.
bounceGravity float Controls the downward acceleration of a released draggable marker
bounceTimeout integer undocumented Controls the time between animation frames of a released draggable marker (and hence the velocity)
clickable bool false to make the marker inert
description string undocumented I don’t know what this does.
draggable bool true to make the marker draggable
dragCrossMove bool true to make the cross move downwards rather than the icon move upwards during dragging.
hide bool true to make marker initially hidden
icon GIcon() Icon to be plotted. If omitted, G_DEFAULT_ICON is used.
id string undocumented sets the marker.id property
name string undocumented I don’t know what this does.
title string tooltip text
zIndexProcess function(GMarker) returning an integer Instead of having the API determine the way that one marker overlays another, you can associate a zIndexProcess with a marker which returns the value that that API will use for the z-index.
See Setting the z-index of markers

A GMarker() has no accessible properties

methods
copy() undocumented Returns a new GMarker that is a copy of this one.
disableDragging() Disables marker dragging.
dragabble() Returns true if this marker was created as a draggable marker
dragging() undocumented returns true if this marker is currently being dragged
draggingEnabled() Returns true if dragging is enabled on this marker
enable Dragging() Enables dragging, if the marker was created as a draggable marker
getIcon() Returns the GIcon() associated with the marker
getPoint() Returns the GLatLng() where the marker is located
getLatLng() Returns the GLatLng() where the marker is located [an alias of getPoint().]
hide() Hides the marker
initialize(map) Used by map.addOverlay() to set up the marker.
isHidden() Returns true if the marker is hidden
openInfoWindow(a,b) Opens the info window, see above for parameters
openInfoWindowHtml(a,b) Opens the info window, see above for parameters
openInfoWindowTabs(a,b) Opens the info window, see above for parameters
openInfoWindowTabsHtml(a,b) Opens the info window, see above for parameters
redraw(bool) If the optional parameter is present and true, the marker is redrawn.
remove() Destroys the images[ ]. Used by map.removeOverlay() to recover memory.
setImage(filename) Changes the marker image.
setPoint(latlng) Changes the location of the marker, recalculates the z-index and redraws it.
setLatLng(latlng) Changes the location of the marker, recalculates the z-index and redraws it. [an alias of setPoint().]
show() Makes a hidden marker visible
showMapBlowup(a,b) Opens the info window with a blowup maplet, see above for parameters
getTitle() Returns the {title} associated with this marker.
closeInfoWindow() Closes the info window only if the info window is associated with this marker.
bindInfoWindow(node,options) See below.
bindInfoWindowHtml(text,options) See below.
bindInfoWindowTabs(tabElemArray,options) See below.
bindInfoWindowTabsHtml(tabStrArray,options) See below.

The marker.bindInfoWindow*() methods create GEvent listeners that perform the corresponding marker.openInfoWindow*() calls when the marker is clicked.

E.g.
marker.bindInfoWindowHtml(“hello world”,{maxWidth:500})
seems to be shorthand for

GEvent.addListener(marker,”click”, function() {
marker.openInfoWindowHtml(“hello world”,{maxWidth:500});
});

There are differences in the timing of the evaluation of the variables. You don’t need a createMarker() function to hold function closure on the .bindInfoWindow() parameters.

GMarkerManager()

A GMarkerManager() can be used to manage large numbers of markers efficiently as long as you’re careful to only have a modest number of markers visible in the viewport at any one time.
Constructor new GMarkerManager(map, options)

properties
There are no accessible properties

Options
borderPadding integer Specifies, in pixels, the extra padding outside the map’s current viewport monitored by a manager. Increasing the value makes it more likely that a marker will be already rendered when the map pans, but decreases the efficiency of redrawing the markers (e.g. when the zoom level changes).
maxZoom integer The maximum zoom level to be managed. Defaults to the max zoom of the map type that is current when the manager is created.
trackMarkers boolean Automatically refresh the marker display when a managed marker changes position with .setPoint().

methods
addMarker(marker, minzoom, maxzoom) Adds a marker to be displayed when the zoom number is in the specified range.
addMarkers(markerArray, minzoom, maxzoom) Adds an array of markers to be displayed when the zoom number is in the specified range.
getMarkerCount(zoom) Returns the number of managed markers for the specified zoom level.
refresh() Redraws the managed markers.
GMenuMapTypeControl()

A GControl() structure that manages map type switching, typically in the top right corner of the map. Has all the properties and methods of the GControl() class.
Similar to GMapTypeControl() except that it uses a drop down menu instead of separate buttons.

It additionally accepts two optional parameters.
parameters
a bool If present and true, the control will use short names in the map type buttons.
b bool undocumented If present and true, the control will have an extra border.
GMercatorProjection()

Handles the translation between geographical locations and pixel positions for a map type that uses Mercator maps.
The GMercatorProjection() constructor and methods assume a tile size of 256 by 256. The getTileSize() information from the GMapType() is not used.

Constructor
new GMercatorProjection(maxResolution)

properties
There are no accessible properties

methods
fromLatLngToPixel(latlng,zoom) Returns a GPoint() containing the pixel position (in the tilespace) corresponding to the geographical location.
fromPixelToLatLng(point,zoom,nofix) Returns a GLatLng() containing the geographical location corresponding to the point in tilespace. If the optional nofix parameter is not present, out of range latitudes are fixed to +-90, and out of range longitudes are wrapped around the globe into the range +-180.
getWrapWidth(zoom) Returns the wrap width of the tile space in pixels.
tileCheckRange(point,zoom,tilesize) Returns true if point.y is within the tilespace for the specified zoom level, and wraps point.x around the globe to a value that is within the tilespace.
If point.y is outside the tilespace, then it returns false without wrapping point.x.
The tilespace is a square array of tiles that cover the Earth.
The Mercator projection never actually reaches the poles. In this implementation, the mapping stops at about latitude 85.0511.
The pixel represented by GPoint(0,0) always represents the geographical location GLatLng(85.0511, -180).
At zoom level 0, there is one tile, tileBounds[0] is 1, pixelOrigo[0] is GPoint(128,128) – the distance from a corner of that tile to the centre.
At zoom level 1, there are four tiles in a 2*2 grid, tileBounds[1] is 2, pixelOrigo[1] is GPoint(256,256).
At zoom level 17, there are 17,179,869,184 tiles in a 131072*131072 grid, tileBounds[17] is 131072, pixelOrigo[17] is GPoint(16777216, 16777216).
GNavLabelControl()

GControl() structure that reverse geocodes the current map position and displays some of the upper levels of the address details as clickable links.
GOverlay()

This class holds the common methods that are inherited by GMarker(), GPolyline() , GPolygon(), GInfoWindow(), GGeoXml(), GTrafficOverlay(), GGroundOverlay() and GTileLayerOverlay()
This class can also be used to create custom overlays, in which case you may need to create your own copies of the methods.

methods
copy() Returns a new GOverlay that is a copy of this one.
hide() Hides the overlay
initialize(map) Used by map.addOverlay() to set up the overlay.
redraw(bool) If the optional parameter is present and true, the overlay is redrawn.
remove() Used by map.removeOverlay() to recover memory.
show() Shows the overlay
Static Method
GOverlay.getZIndex(lat) Returns a z-index value for a given latitude. It computes a z index such that overlays further south are on top of overlays further north, thus creating the 3D appearance of marker overlays.
GOverviewMapControl()

A GControl() object providing an overview map
Has all the properties and methods of the GControl() class plus the methods described below.
parameters
a GSize() undocumented Specifies the size of the overview map.
methods
getOverviewMap() undocumented Returns a pointer to the overview map div.
hide(instant) Reduces the overview map to a small icon.
If the undocumented parameter is set true then the overview closes instantly, otherwise there’s a short animation.
show(instant) Expands a hidden overview map. If the undocumented parameter is set true then the overview opens instantly, otherwise there’s a short animation.
setMapType(a) undocumented Sets the map type. The parameter is a GMapType() object.
GPoint()

Identifies a pixel position or a pixel offset.
Constructor new GPoint(x,y)

properties
x horizontal position
y vertical position
methods
equals(point) Returns true if the two points are equal.
toString Returns a string in the format “(123,123)”

GPolyline()

Describes a vector polyline.
Constructor new GPolyline(points, color, weight, opacity, opts)

parameters
points An array of GLatLng() or GPoint() objects
color String: the colour of the line in the format “#ffffff”
weight Integer: the width of the line
opacity Float: the opacity of the line in the range 0.0 to 1.0
opts Object Literal: A set of GPolylineOptions
options
id undocumented I don’t know what this does.
mapsdt undocumented I don’t know what this does.
name undocumented I don’t know what this does.
geodesic When set true, a geodesic line is drawn instead of a straight line on the screen.
clickable When set false the clicks drop through to the underlying map.

properties
undocumented
color The colour of the line
opacity The opacity of the line
weight The width of the line
If you change any of the properties, call the .redraw(true) method to cause the changes to take effect.
Now that the documented .setStrokeStyle() Method is available, there’s no need to use these undocumented properties.

methods
copy() Returns a new GPolyline that is a copy of this one.
deleteVertex(N) Removes the specified vertex.
The poly must already be addOverlay()ed to a map
disableEditing() Cancels .enableEditing()
enableDrawing(opts) Allows the user to contruct or modify the poly.
The poly must already be addOverlay()ed to a map
The options are: {maxVertices:integer, fromStart:true}
enableEditing(opts) Allows the user to edit an existing poly.
The poly must already be addOverlay()ed to a map
The options are: {maxVertices:integer}
getVertex(N) Returns a GLatLng() object specifying the location of the Nth point.
getVertexCount() Returns the number of points in the polyline.
initialize(map) Used by map.addOverlay() to set up the polyline.
insertVertex(N,latlng) Inserts a new vertex.
redraw() The polyline is redrawn. [Prior to V2.101 you had to use .redraw(true)]
remove() Used by map.removeOverlay() to recover memory.
supportsHide() Returns true or false indicating whether the overlay supports .hide(), .show() and .isHidden()
Currently true if SVG or VML is used to draw the graphic, and false otherwise.
hide() Hides the polyline
show() Shows the polyline
isHidden() returns true if the polyline is hidden
getLength() Returns the length of the polyline in metres
getBounds(v1,v2) Returns the bounds for the polyline as a GLatLngBounds. The undocumented optional parameters can be used to specify the vertex numbers of a section of the polyline.
setStrokeStyle(opts) Changes the style of the poly.
The poly must already be addOverlay()ed to a map.
The options are: {color:string, weight:number, opacity:number}

defaults
If you omit the colour, weight or opacity, the default values will be used: “#0000ff”, 5, 0.45

Static methods
fromEncoded(code,opts) Creates a polyline from an encoded string. See The official documentation
GPolygon()

Describes a filled polygon.
Constructor new GPolygon(points, strokeColor, strokeWeight, strokeOpacity, fillColor, fillOpacity, opts)

parameters
points An array of GLatLng() or GPoint() objects
strokeColor String: the colour of the boundary in the format “#ffffff”
strokeWeight Integer: the width of the boundary
strokeOpacity Float: the opacity of the boundary in the range 0.0 to 1.0
fillColor String: the colour of the fill in the format “#ffffff”
fillOpacity Float: the opacity of the fill in the range 0.0 to 1.0
opts Object Literal: A set of GPolygonOptions
options

id undocumented I don’t know what this does.
name undocumented I don’t know what this does.
mapsdt undocumented I don’t know what this does.
outline undocumentedBoolean: set false to switch off the boundary
clickable When set false the clicks drop through to the underlying map.

properties
undocumented
color The colour of the polygon fill
opacity The opacity of the polygon fill
outline Boolean: set to false to switch off the boundary
If you change any of the properties, call the .redraw(true) method to cause the changes to take effect.
Now that the documented .setStrokeStyle() and .setFillStyle() Methods are available, there’s no need to use these undocumented properties.

methods
copy() Returns a new GPolygon that is a copy of this one.
deleteVertex(N) Removes the specified vertex.
The poly must already be addOverlay()ed to a map
disableEditing() Cancels .enableEditing()
enableDrawing(opts) Allows the user to contruct or modify the poly.
The poly must already be addOverlay()ed to a map
The options are: {maxVertices:integer, fromStart:true}
enableEditing(opts) Allows the user to edit an existing poly.
The poly must already be addOverlay()ed to a map
The options are: {maxVertices:integer}
getVertex(N) Returns a GLatLng() object specifying the location of the Nth point.
getVertexCount() Returns the number of points in the polyline.
initialize(map) Used by map.addOverlay() to set up the polyline.
insertVertex(N,latlng) Inserts a new vertex.
redraw(bool) If the optional parameter is present and true, the polygon is redrawn.
remove() Used by map.removeOverlay() to recover memory.
supportsHide() Returns true or false indicating whether the overlay supports .hide(), .show() and .isHidden()
Currently true if SVG or VML is used to draw the graphic, and false otherwise.
hide() Hides the polygon
show() Shows the polygon
isHidden() returns true if the polygon is hidden
getArea() Returns the area of the polygon in square metres.
getBounds() Returns the bounds of the polygon as a GLatLngBounds
setFillStyle(opts) Changes the fill style of the poly.
The poly must already be addOverlay()ed to a map.
The options are: {color:string, opacity:number}
setStrokeStyle(opts) Changes the stroke style of the poly.
The poly must already be addOverlay()ed to a map.
The options are: {color:string, weight:number, opacity:number}

defaults
Although GPolygon defines defaults for strokeWeight and fillColour, it never uses them.

If you omit the strokeWeight, the stroke is not performed.

If you omit the fillColor, GPolygon sets the fill colour to the default value, “#0055ff”, but then doesn’t perform the fill.

The default fillOpacity is 0.25.

The defaults for strokeColour and strokeOpacity are the same as those for GPolyline: “#0000ff” and 0.45

Static methods
fromEncoded(code,opts) Creates a polygon from an encoded string.
GProjection()

This class provides a general structure for projection calculations. It is only used internally by GMercatorProjection() since that’s the projection system that Google maps use.
The methods provided by GProjection() are empty stubs. Any real GProjection() object would have to overwrite them with its own methods that perform the relevant calculations.

It is possible to write your own GProjection() instance that uses a non-Mercator projection, such as Gall-Peters or Mollweide, or to write a flat projection for mapping non-spherical domains by writing suitable code to replace the method stubs.
methods
fromLatLngToPixel(latlng,zoom) Stub: Throws a an error “Required interface method not implemented”
fromPixelToLatLng(point,zoom,nofix) Stub: Throws a an error “Required interface method not implemented”
getWrapWidth(zoom) Returns Infinity.
tileCheckRange(point,zoom,tilesize) Returns true.
GRoute()

A GDirections() object can contain one or more routes, an additional route for each additional waypoint. The GRoute() object describes information specific to one route. There is no GRoute() constructor, you can only obtain a GRoute() by using GDirections.getRoute(n).
methods
getDistance() returns an Object that contains the distance information
.getDistance().html is a HTML string that describes the distance in suitable units
.getDistance().meters is a number indicating the distance in metres
getDuration() returns an Object that contains the duration information
.getDuration().html is a HTML string that describes the duration in suitable units
.getDuration().seconds is a number indicating the estimated duration in seconds
getEndGeocode Returns geocode information for the end point
getEndLatLng Returns a GLatLng object specifying the end point of the actual polyline.
getNumSteps Returns the number of steps in this route
getStartGeocode Returns geocode information for the start point
getStep(n) Returns a GStep() object
getSummaryHtml() returns a HTML string containing something like “790 mi (about 12 hours 28 mins)”
GScaleControl()

A GControl() structure that displays a map scale, typically in the bottom left corner of the map.
Has all the properties and methods of the GControl() class, and additionally has the properties shown below.
If _mPreferMetric is set to true, then the metric scale is on top instead of below the feet/miles scale.

It additionally accepts an optional parameter.
parameters
a integer undocumented (Optional) Max length of the scale in pixels.
properties
bar A div containing part of the graphics
cap A div containing part of the graphics
container A div containing all the other divs
fpsBar A div containing part of the graphics
fpsLbl A div containing the text for non-metric measurements
map A reference to the map that contains this Scale
maxLength Max length of the scale in pixels
metricBar A div containing part of the graphics
metricLbl A div containing the text for metric measurements
GScreenOverlay

Places an image on the screen which remains in a fixed position. It does not move when the map drags.
The overlay does not capture mouse clicks. You can drag the map through the overlay. You can’t, however, click on markers through the overlay.

The overlay is below the map controls, so clicks on the map controls do work.

The info window does not attempt to avoid opening underneath a GScreenOverlay.

In MSIE, the API throws the image to the DirectX AlphaImageLoader. One consequence of this is that animated gifs are inanimate in MSIE.

GScreenOverlay() accepts an indeterminate number of parameters, among which are:

parameters
image string URL of the image
position GScreenPoint position of the image on the screen
anchor GScreenPoint point of the scaled image which is anchored to that position
size GScreenSize size

methods
GScreenOverlay is a GOverlay and has all the methods of that Class, however some of those methods (e.g. .redraw()) don’t actually do anything.

GScreenPoint

Something like a GPoint(), used for placing a GScreenOverlay().
parameters
x number horizontal position
y number vertical position
xunits optional string can be “pixels” or “fraction”
yunits optional string can be “pixels” or “fraction”

properties
point GPoint(x,y)
xunits can be “pixels” or “fraction”
yunits can be “pixels” or “fraction”

If you modify the properties, the new values only take effect the next time you addOverlay() the GScreenOverlay that uses it.

GScreenSize

Something like a GSize(), used for placing a GScreenOverlay().
parameters
x number width
y number height
xunits optional string can be “pixels” or “fraction”
yunits optional string can be “pixels” or “fraction”

properties
size GSize(x,y)
xunits can be “pixels” or “fraction”
yunits can be “pixels” or “fraction”

If you modify the properties, the new values only take effect the next time you addOverlay() the GScreenOverlay that uses it.

GSize()

Represents the pixel size of a region or object.
Constructor new GSize(width, height)
properties
width Width in pixels.
height Height in pixels
methods
equals(gsize) Returns true if the GSize() objects are equal.
toString() Returns a string in the format “(123,123)”
getHeightString() undocumented Returns the height in the format “123px”
getWidthString() undocumented Returns the width in the format “123px”
There is also a class property GSize.ZERO, which constructs a new GSize() object with zero height and width.

GSmallMapControl()

A GControl() structure that provides zoom and pan controls, typically in the top left corner of the map.
Has all the properties and methods of the GControl() class.
GSmallZoomControl()

A GControl() structure that provides zoom controls, typically in the top left corner of the map.
Has all the properties and methods of the GControl() class.
GSmallZoomControl3D()

A GControl() structure that provides zoom controls using the new “3D” graphics, typically in the top left corner of the map.
Has all the properties and methods of the GControl() class.
GScript()

undocumented
This function loads a Javscript file into the current page.

parameters
url URL of the .js file to be loaded
GStreetviewClient()

Obtains details of Streetview locations from the Streetview server.
Constructor
new GStreetviewClient(client)
The optional parameter is a string which defaults to “api”.

properties
A GStreetviewClient() has no accessible properties

methods
getNearestPanorama(latlng,callback) Returns full details of the Streetview location to the callback function.
getNearestPanoramaLatLng(latlng,callback) Returns the latlng of the Streetview location, or null
getPanoramaById(id,callback) Returns full details of the Streetview location to the callback function.

reply
The full details reply may look like this: In APIv2.103, the “copyright”, “location” and “links” elements are absent.
code Status code. 200 is supposed to mean success, but a reply may well contain only a success code and no further details
Data.copyright undocumented Copyright text
location.description Description of the location
location.latlng GLatLng of the actual view point.
location.panoId ID of the panorama
location.pov Initial point of view
location.zoomLevels undocumented Number of zoom levels
Links undocumented Array of up to two adjacent View points
copyright Copy of .Data.copyright
Location Copy of .location
links Copy of .Links

The Links information looks like this:
description Description of the adjacent location
panoId Panorama ID of the adjacent location
yawDeg bearing to the adjacent location
The panorama has a yellow band which points in the “yawDeg” directions, is labelled with the “description” texts and clicking on the arrows moves to the viewpoint specified by the corresponding “panoId”.

GStreetviewOverlay()

Creates a GTileLayerOverlay containing tiles that indicate locations which have Streetview imagery.
Constructor
new GStreetviewOverlay()

properties
A GStreetviewOverlay() has no accessible properties

methods
costructor(tilelayer) undocumented This might not be a real Method, it may be a weird back reference from an instance to its constructor.
copy() Returns a new GTileLayerOverlay that is a copy of this one.
getTileLayer() undocumented Returns a reference to the GTileLayer()
hide() Hides the overlay
initialize(map) Used by map.addOverlay() to set up the overlay.
isHidden() returns true if the overlay is hidden
redraw() Does nothing.
refresh() undocumented Performs a .refresh() on the GTileLayerOverlay
remove() Used by map.removeOverlay() to recover memory.
show() Unhides the overlay
supportsHide() Returns true, thus indicating that the overlay supports .hide(), .show() and .isHidden()
GStreetviewPanorama()

Displays Streetview imagery.
Constructor
new GStreetviewPanorama(container,client/options)

parameters

The fist parameter is the HTML element, typically a <div>, in which the panorama is to be displayed.

In v2.103, the second paramter is optional “context”, and defaults to “api”

In v2.104 onwards, the second paramter is optional set of options. The options can include {latlng}, {pov} and {context}. The context defaults to “api”, the pov defaults to {yaw:0,pitch:5,zoom:0}. If the {latlng} is absent, the panorama it not initiated until one of the .setLocation methods is used.

properties
A GStreetviewPanorama() has no accessible properties

methods
blur() undocumented Removes the input focus from the panorama. The view will no longer respond to key presses
checkResize() Call this if the size of the container changes
focus() undocumented Applies the input focus to the panorama. The view will respond to the arrow keys, page up, page down, plus and minus.
followLink(bearing) Follows the link to the next panorama that’s closest to the requested bearing
Doesn’t seem to work when testing locally.
getPOV Returns an anonymous POV object which contains {pitch: yaw: zoom:} information.
NOTE: When testing locally, this is the initial point of view that you requested, it doesn’t reflect movements performed by the user within the Flash. When testing on a real web site, it does reflect movements performed by the user within the Flash.
hide() Hides the panorama.
Doesn’t seem to work when testing locally.
isHidden() Returns true is the panoram is hidden.
panTo(POV,longWayRound) Pans to the specified point of view.
The first parameter is a POV object which may contain some or all of {pitch: yaw: zoom: viewHeight:}
If the second parameter is true, it yaws the long way round (performing a 360 degree spin if the yaw was already correct).
Doesn’t seem to work when testing locally.
remove() Deletes the current panorama. You must call .remove() before setting a new location. It is safe to call .remove() on a panorama which is alrady removed.
You should call .remove() before closing the container or exiting the page, otherwise the memory used by the Flash Player will not be recovered in some browsers.

retarget(container) undocumented Removes the current panorama, and changes the container in which the panoramas will be displayed.
setContainer() Performs a .retarget(), then redisplays the current panorama in the new container
setLocationAndPOV(latlng,POV) Sets the panorama view.
The first parameter is a GLatLng.
The second optional parameter is a POV object which may contain some or all of {pitch: yaw: zoom: viewHeight:}
setLocationAndPOVFromServer Response(reply,POV) undocumented Sets the panorama view.
The first parameter is a reply from GStreetviewClient(). Only the panoId is used.
The second optional parameter is a POV object which may contain some or all of {pitch: yaw: zoom: viewHeight:}
setPOV(POV) Jumps to the specified point of view.
The parameter is a POV object which may contain some or all of {pitch: yaw: zoom: viewHeight:}
Doesn’t seem to work when testing locally.
show() Performs an .unhide() then redisplays the panorama. It’s the opposite of .remove()
unhide() undocumented Displays a panorama that was hidden with .hide(), but not .remove()d

POV

Describes the point of view from the Viewpoint. The parameters are
pitch Elevation angle of the view direction. Default=5
yaw Bearing of the view direction, 0=looking North. Default=0
zoom Zoom level. Default=0
viewHeight undocumented Not used? Default=0
All the parameters are optional.
Event Returns
error error code
yawchanged yaw
pitchchanged pitch
zoomchanged zoom
flashstart undocumented none
flashresponse undocumented string, see below
initialized object, see below
infolevel undocumented ?? don’t know

The “yawchanges”, “pitchchanged” and “zoomchanged” events trigger when the corresponding parameter changes.

The “flashstart” event triggers when Flash Player is launched.

I think the “flashresponse” triggers when new information is received from the panorama server, but I don’t understand what provokes the exchange of information.

The “initialized” event triggers when the viewpoint moves to a new location (but not when the moved by GStreetviewPanorama.setLocationAndPOV). It triggers when the user moves the viewpoint along the street, and when GStreetviewPanorama.followLink() is used.

I don’t know what causes the “infolevel” event to trigger.

The “flashresponse” string looks something like this: “324:1,325:39.740116;-104.987404,327:119768;6,322:1;1”.

It looks like it breaks down into a series of sections separated by commas. Each section is formatted like tag:value;value. The only one I can recognise is tag 325 which contains the latitude and longitude.

The object returned from the “initialized” event contains the following properties:
description String: name of street.
lat number: latitude
lng number: longitude
latlng GLatLng object
panoId string: panorama ID
pov POV object. The zoom: and pitch: elements are always void, even if the panorama is zoomed and pitched
streetRange string: ?
yaw number
GTileLayer()

A GMapType() can have more than one layer of tiles. For example the G_HYBRID_MAP has one GTileLayer() that contains the satellite imagery, and a second GTileLayer() that contains the roads and town names.
Some or all of the methods provided by the GMapType() class need to be overwritten by code specific to the tile layer when defining the GTileLayer() object.
Constructor new GTileLayer(copyCollection,minResolution,maxResolution)

parameters
copyCollection A GCopyrightCollection() object
minResolution The minimum zoom level
maxResolution The maximum zoom level
The API code seems to be intended to allow you to omit the copyCollection parameter, but if you do, the code will crash later, so you need to create some sort of GCopyrightCollection(), even if you never use it. E.g. new GTileLayer(new GCopyrightCollection(“”), 7, 14) sets up a tile layer which supports zoom levels 7 to 14.

methods
getCopyright(latlngbounds,zoom) Reads data from the GCopyrightCollection
getOpacity() Returns 1
getTileUrl(tile,zoom) Stub: Throws a an error “Required interface method not implemented”
The “tile” parameter is a GPoint(x,y) object, but the x and y represent tile numbers, not pixels.
isPng() Returns false
maxResolution() Returns the maximum resolution of the layer
minResolution() Returns the minimum resolution of the layer
getCopyrights(latlngbounds,zoom) Returns copyright information.
GStep()

A GRoute() object can contain several steps. The GStep() object describes information specific to one step. There is no GStep() constructor, you can only obtain a GStep() by using GRoute.getStep(n).
methods
getDescriptionHtml() Returns a HTML string containing the driving instructions.
getDistance() returns an Object that contains the distance information
.getDistance().html is a HTML string that describes the distance in suitable units
.getDistance().meters is a number indicating the distance in metres
getDuration() returns an Object that contains the duration information
.getDuration().html is a HTML string that describes the duration in suitable units
.getDuration().seconds is a number indicating the estimated duration in seconds
getLatLng Returns a GLatLng object specifying the location of the step.
getPolylineIndex Returns a number which indicates the corresponding Vertex number in the polyline
GTileLayerOverlay()

Places a tilelayer above a base map as a separate object rather than as part of a map type.
Constructor
new GTileLayerOverlay(tilelayer,opts)

parameters
tile layer The GTileLayer() object to be used as an overlay.
opts Currently the only option is {zPriority} whicha can be used to set the z-index. Defaults to 10

properties
zPriority undocumented z-index relative to other elements on this Pane

methods
copy() Returns a new GTileLayerOverlay that is a copy of this one.
initialize(map) Used by map.addOverlay() to set up the GTileLayerOverlay.
redraw(bool) Does nothing.
remove() Used by map.removeOverlay() to recover memory.
supportsHide() Returns false, thus indicating that the overlay does not support .hide(), .show() and .isHidden()
getTileLayer() Returns a reference to the GTileLayer associated with this overlay
refresh() Causes all the tileUrls to be recalculated and the tile layer to be redrawn.

GTrafficOverlay

Adds a traffic overlay to the map.
Constructor new GTrafficOverlay()

Use map.addOverlay() to add the overlay to the map.

methods
initialize(map) Used by map.addOverlay() to set up the overlay.
redraw(bool) Redraws the overlay.
remove() Used by map.removeOverlay() to recover memory.
disableTrafficButton() Stops the traffic button being displayed alongside the map type control.
disableTrafficLayer() Disables the traffic layer.
enableTrafficButton() Displays the traffic button alongside the map type control
enableTrafficLayer() Causes the traffic layer to be displayed.
trafficButtonEnabled() Returns true if the traffic button is enabled
trafficLayerEnabled() Returns true if the traffic layer is enabled
hasTrafficInView() Returns true if there is trafic data within the current viewport.
Note: There’s a lag between the map movement and the availability of this information. Don’t try to use it within a map “moveend” listener.

By default, the traffic button is enabled and the layer is disabled. Clicking the button enables and disables the traffic layer.

The .copy(), .hide() and .show() methods also exist, but they simply throw a “Interface not implemented” error.
GUnload()

Call this function to destroy the structures created by the API, so that the memory can be recovered.
Typically, use <body onunload=”GUnload()”> to avoid memory leaks.

GUnloadApi()

Function called by GUnload() to destroy the structures created by the API.
GUnload() is included in the API loader, rather than the main API code, and behaves sensibly in situations where the main API code has not been laoded, e.g. if the browser was found to be not compatible.

GValidateKey()

undocumented
This function performs API key validation.

Hashes various subsets and variations of the current windows.location information. If one of the hashes matches the key has it returns true.
parameters
a string Key hash (typically provided by the API loader code)
GVerify()

undocumented
I’ve no idea what this is intended to do.

parameters
a string URL of an image file.
GXmlHttp()

GXmlHttp() just provides the .create() method, which accesses browser-specific XML request mechanisms.
methods
create() Creates a new ActiveXObject(“Microsoft.XMLHTTP”) or a new XMLHttpRequest() depending on the browser environment.

GXml()

GXml provides methods for processing XML content. methods
parse(text) Performs XML parsing on a text string and returns the corresponding XML DOM.
This can be used if your webserver is unable to set the MIME type correctly on your XML data file.
value(xmlNode) Returns the text content of an XML node.
This can be used to obtain data from an XML file where the data structured like this <xmltag>content</xmltag> rather than <xmltag attribute=”content” />.
GXslt()

Constructor
new GXslt(xslt)
parameters
xslt DOM element The DOM element that describes the XSLT document
methods
transformToHtml(xmlDoc, container) Transforms the XML to HTML DOM elements, placing the result into the HTML container

Third Party Extensions

Google Maps API Tutorial

Using the EBubble extension

The EBubble extension provides an alternative to custom info windows.

You can use EBubbles in a similar manner to info windows, but the technology is completely different, and causes significant differences in the behaviour.

  1. The background of an EBubble is fixed-size image file. That allows you to make the graphic as fancy as you like, but it’s obviously only suitable in situations where your contents conform to a standard size.
  2. The EBubble is not attached to the map, it’s attached directly to the <body>. This has the advantage that the EBubble can lie partly outside the map, but has the disadvantage that it doesn’t move when the map moves.
  3. In order not to look silly when the map moved from under it, the EBubble closes when the map moves.
  4. In order to minimise strange click-through behaviour, by default the EBubble closes when clicked.

Here’s an example

The background image for that EBubble was created in PaintShopPro using a simple speech bubble object. I applied the Inner Bevel effect to make it look a little 3D, added a central drop shadow, and gave the whole image partial transparency.

The basic procedure for using an EBubble is:

  1. Download ebubble.js and place it on your web site.
  2. Load the Javascript code like this <script type=”text/javascript” src=”ebubble.js”></script>
  3. Create one or more EBubble instances.
  4. Open the EBubble with bubble.openOnMarker(marker,html) or bubble.openOnMap(point, html, offset)

EBubble Constructor

The parameters for new EBubble() are:

map The map on which the EBubble is to appear.
image URL of the background image
imageSize GSize() specifying the size of that image
contentSize GSize() specifying the size of the inner area when the contents can be written.
contentOffset GPoint() specifying the offset of top left corner of the inner area from the top left corner of the background image
anchor GPoint() specifying the anchor point of the image
noCloseOnClick Optional: set to true to not close the EBubble when it is clicked

The content is not actually constrained by the contentSize parameter. If you put more content into it, then the contens will overflow.

Specifying noCloseOnClick may sometimes cause strange click-through behaviour, but it might improve things if you’re experiencing problems with clickable elements inside your EBubble contents.

Opening an EBubble

There are two methods provided for opening an EBubble

bubble.openOnMap

This opens the EBubble on the map that you specified in the EBubble constructor.

point A GLatLng() or GPoint() specifying the geographical location
html A string containing the HTML to be displayed.
offset (optional) A GPoint() specifying a pixel offset.

bubble.openOnMarker

This opens the EBubble on the map that you specified in the EBubble constructor, with a location derived from the specified marker.

This call uses the infoWindowAnchor parameter of the icon that is being used by the marker.

marker The marker on which the EBubble is to be opened.
html A string containing the HTML to be displayed.

Multiple EBubbles

You can have as many EBubbles as you like on the same map.

You can use different background images for different EBubbles.

Closing an EBubble

Use bubble.hide()

The EBubble wil also close automatically if the map moves or if the user clicks on the EBubble.

I provide a bubble.show() method, but I don’t recommend using it, because it doesn’t track map movements. If you want to re-open the bubble, use .openOnMap() or .openOnMarker() again.

Events

When an EBubble is clicked, it throws a “click” event.

More About The Parameters

Consider this bubble image:

While creating the image, I recorded the following information:

The total size of the image is (297,243), which makes the 3rd parameter new GSize(297,243)

The contents go in the rectangular area marked by the black box. The size of the box is (224,126), which makes the 4th parameter new GSize(224,126)

The green dot indicates the position of the black box. It is located at (36,28), which makes the 5th parameter new GPoint(36,28)

The red dot at the tip of the stem is the point which will be anchored to the map location. It is located at (175,238), which makes the 6th parameter new GPoint(175,238)

Here’s an example which uses that image.

Credits

Inspired by the Radio Shack Store Locator: www.radioshack.com/storeLocator3 (but not using any of their code) (I couldn’t understand it).

Custom Maps

Google Maps API Tutorial

Custom Map Types

To create a custom map, you first need to create a set of 256*256 tiles, or obtain a set for which you have the relevant permissions. Or, alternatively, write your own tileserver code that runs on your server and can create the tile images on the fly.

A Simple Custom Map

To use these tiles as a simple Custom Map Type, you need to do following:

  • Create a GCopyright object
  • Create a GCopyrightCollection
  • Add the GCopyright to the GCopyrightCollection
  • Create a GTileLayer object
  • Create a GMapType object
  • Add the GMapType to the map

These steps are well described in The Mapki so I’ll not repeat that information here.

Here’s an example.

The only significant difference between this example and the Makpki information is that my tiles are stored as images in my web folder, rather than being generated by a tileserver script.

Aligning your map

There’s a very nice facility at open.atlas.free.fr/GMapsTransparenciesImgOver.php which can be used to align a map image in the correct place on top of a Google map.

It specifies the preprocessing (scaling and padding) that should be performed on your image before using something like the Automatic Tile Cutter mapki.com/wiki/Automatic_Tile_Cutter to cut your image into tiles.

Bounds checks

One problem with the previous example is that it causes the API to perform standard error tile handling when the user drags the map out of the custom region. This is a bit ugly and slow.

So what we can do is to add a check in the CustomGetTileUrl() code to see if the tile is in the custom region, and if not return a special “blank.jpg” tile.

Here’s an example.

It would have been nice to have been able to store the information about the custom region tiles in a series of GBounds() objects (one for each supported zoom level) and test to see if the GPoint() representing the tile number is inside the GBounds(), but there is no GBounds.contains(point) method.

Bounds Checks 2

Instead of returning a blank tile for tiles that are outside the custom region, you could return the URL of a tile from G_NORMAL_MAP or G_SATELLITE_MAP.

The problem with this is that you should then display the Google copyright string whenever a Google tile is visible. This turns out to be extremely tricky to get right.

In this example, I display the custom copyright string whenever a custom tile is visible and the Google copyright string whenever no custom tiles are visible.

If you know a better way of handling the copyright, please let me know atlas@econym.demon.co.uk

Common CustomGetTileUrl formats

This code returns URLs in the format created by the Photoshop tile splitter: “http://mydomain.com/tiles/5295_5922_3.jpg&#8221;

      CustomGetTileUrl=function(a,b){
          return "http://mydomain.com/tiles/"+a.x+"_"+a.y+"_"+(17-b)+".jpg";
      }

This code returns URLs in the format created by the Paint Shop Pro tile splitter: “http://mydomain.com/tiles/14_5922x5295.jpg&#8221;

      CustomGetTileUrl=function(a,b){
          return "http://mydomain.com/tiles/"+b+"_"+a.y+x+a.x+".jpg";
      }

This code returns URLs in the format used by the Google Normal Map tileserver: “http://mydomain.com/tileserver.php?x=5295&y=5922&zoom=3&#8221;

      function CustomGetTileUrl(a,b) {
        var z = 17 - b;
        var f = "http://mydomain.com/tileserver.php?x="+a.x+"&y="+a.y+"&zoom="+z;
        return f;
      }

Potential Pitfalls

  1. Some API features, such as polylines and ground overlays, perform their calculations at zoom level 17, rather than at the max zoom level of the map type. These features will fail if the GProjection() of the map type ahs less than 18 zoom levels.

More advanced stuff

Google Maps API Tutorial

A Custom Slider

Writing a custom slider isn’t particularly easy. I’m not going to go through the code in detail. I’ll just give you two versions of some example code that have lots of comments, and point out some of the interesting points.

Here’s an example that doesn’t work correctly in MSIE6.

Here’s an example that works correctly, but is a little less readable.

The code is the same apart from the extra code to pass transparent PNG files to the AlphaImageLoader. If you’re using GIFs, JPEGs or PNGs without transparency then use the first version.

The Javascript that drives the slider is here and here.

Points of Interest

In the GEvent callback functions, the “this” isn’t a reference to our GControl, but we do need such a reference. We could set up a global variable to hold the reference, but then things would go wrong if we had two maps using the same slider code on the same web page. My solution is to store a reference to the “this” in a local variable on which we obtain Function Closure.

When the zoom level is changed by other code, we have to move the contents of the GDraggableObject by setting its style.top, and we also need to set the .top property of the GDraggableObject itself, so that the API knows about the new position.

When the user moves the slider, YSliderControl.setZoom() changes the zoom level of the map. This then triggers a zoomend event, which then triggers YSliderControl.setSlider(). I hadn’t really indended for that to happen, but it actually turns out nice, because if the user moves the slider to an inermediate position, the .setSlider() call causes the slider to snap to the exact position that represents the selected zoom level.

The slider movement performed by .setSlider() doesn’t trigger a dragend event on the GDraggableObject, so we don’t get into a loop.

More advanced stuff

Google Maps API Tutorial

Geocoding with error handling

The mechanics of geocoding without error handling are well explained in the official documentation but the examples shown there do not include error handling.

Geocoding requests can fail for a variety of reasons, so it’s a good idea to check for successful completion before attempting to plot markers using the returned information.

It’s also helpful to display the failure reason to your users, where possible, otherwise your users might waste their time doing things like trying to guess the correct spelling of “Sauchiehall Street, Glasgow, UK”, if the problem isn’t the spelling but the fact that you’ve used up youir geocoding quota already.

What you can do is to set up an array like this

 var reasons=[];

 reasons[G_GEO_SUCCESS]            = "Success";

 reasons[G_GEO_MISSING_ADDRESS]    = "Missing Address: The address was either missing or had
                                      no value.";

 reasons[G_GEO_UNKNOWN_ADDRESS]    = "Unknown Address:  No corresponding geographic location
                                      could be found for the specified address.";

 reasons[G_GEO_UNAVAILABLE_ADDRESS]= "Unavailable Address:  The geocode for the given address
                                      cannot be returned due to legal or contractual reasons.";

 reasons[G_GEO_BAD_KEY]            = "Bad Key: The API key is either invalid or does not match
                                      the domain for which it was given";

 reasons[G_GEO_TOO_MANY_QUERIES]   = "Too Many Queries: The daily geocoding quota for this site
                                      has been exceeded.";

 reasons[G_GEO_SERVER_ERROR]       = "Server error: The geocoding request could not be
                                      successfully processed.";

and display the text associated with the reply.Status.code.

When using geocoder.getLocations(), accessing the status code is straight forward, see this example

When using geocoder.getLatLng(), the status code is not returned. You could follow a failed getLatLng() with a getLocations() request and examine its status code. There is a possibility that the status code might be different, in particular, if there was a server timeout on the first attempt, the second attempt might even succeed.

I recommend avoiding geocoder.getLatLng(). It might seem to make the coding easier, but the lack of error handling makes things more difficult in the long run.

Fitting the zoom

The geocoder now returns an ExtendedData section which gives details of a Lat/Lon box that can be used to zoom the map appropriately. Here’s an example.

In that example, if you search for “France” you get zoom level 6. If you search for “123 Avenue des Champs-Elysees, Paris, France” you get zoom level 16.

Note that the Lat/Lng box isn’t a perfect fit for the target location. It’s just there to provide sensible zooming.

Potential Pitfalls

  1. Be aware that geocoder requests are asyncrhonous. The request is sent to the geocoder and processing continues immediately without waiting for the reply to come back.Make sure that all the code that operates on the results is placed inside the event handler function.
  2. Don’t send lots of requests at once. There’s a rate limit on the number of geocode requests that you can send per second.

More advanced stuff

Google Maps API Tutorial

Custom GEvent types

You don’t have to be limited to using the GEvent event types that Google supply.

If you want to pass information from one part of your own code to another you can use your own GEvents. You don’t have to do anything special to get this to happen, you just perform GEvent.addListener and GEvent.trigger using your custom event type, just as if it were one of the inbuilt event types.

Here’s an example that uses the new events “to” and “from” to handle the “get directions” options in an info window. By using events in this way, it’s not necessary to use the to_htmls[ ] and from_htmls[ ] arrays that were used in map 4, since we can now hold the information by function closure.

You can pass these custom events on any object, these can be API objects, HTML elements, data structures, or any type of Object().

   GEvent.addListener(map, "myevent", ...
   GEvent.addListener(document.getElementById("message"), "thisevent", ...
   var fred = new Object();
   GEvent.addListener(fred, "thatevent", ...

The Basics

Google Maps API Tutorial

Data in JSON files

Another format in which your data can be stored is JSON.

The Javascript to process JSON data is simpler and more efficient than that required to process XML or plain text files. On the downside: the JSON data format has a more complicated structure, so it’s more difficult to create and maintain the data file or to write server-side code that will generate JSON files.

If your JSON file comes from a trusted source, then you can simply perform an eval command on the JSON data to convert the JSON text into a Javascript object. Treat JSON files obtained from a third party source with as much care as you would with third-part Javascript files. A JSON file can include calls to any accessible Javascript function.

Although JSON files parse very efficiently, their file size tends to be larger than XML, so they end up only being slightly faster than XML. Plain text files take longer to parse, but their file size can be much smaller so they take less time to fetch.

In my tests, with Firefox, JSON was 7% faster than XML overall, and plain text files were 2% faster than XML. The timings of my test with IE were so wildly variable that the results were meaningless.

Here’s an example

You can see the JSON file that I used here

The code defines a function “process_it()” which processes the retrieved data.

The entire data file is passed to process_it() as a single string, which we can then parse with the evalcommand. This creates a Javascript Object that has the properties specified in the JSON file.

Unlike XML, JSON files can contain < and >.

There’s no problem with MIME types either. The code should work whatever MIME type is served.

If your JSON file contains numeric data (e.g. {“lat”:43.65654} rather than {“lat”:”43.65654″}) then you won’t need to use parseFloat() and parseInt() to convert the data.

Constructors

It is also possible to use calls to constructors and other functions inside a JSON file. This can make the Javascript even simpler without making the JSON file much more complicated.

This example uses a JSON file that includes calls to new GLatLng()

You can see the JSON file that I used here

This might give you a clue about possible security issues with using eval to parse JSON data from an untrusted source.

Potential Pitfalls

  1. Be aware that Javascript i/o is asynchronous, so that the browser can get on with doing other things like fetching images if the i/o request takes a while to complete.
    If you’re used to programming languages that wait for i/o to complete, you might tend to put code that uses the data read from the file after the “GDownloadUrl()” statement. That would be wrong because code placed there would get executed immediately rather than waiting for the data to arrive. Any code that acts on the retrieved data should be placed inside the process_it() function.
  2. If you’re using an application or script to create your JSON file, watch out for the data types. If the numeric data is being served as strings, then you will need to use parseInt() and parseFloat() in your Javascript, just like you would do when using XML.

The Basics

Google Maps API Tutorial

The AJAX Philosophy

Note: It’s possible to use the basic philosophy behind AJAX without necessarily using ajaxslt.js or any of the specific technologies that happen to be mentioned in the AJAX acronym (Asynchronous Javascript And XML).

The fundamental philosophy of AJAX is to load the static parts of your webpage only once, and request a small amount of information about the bits that change from a server. This makes changing the displayed data much faster.

My new website does have PHP, so this example now uses it. Clicking the [A], [B] and [C] buttons causes the current markers to be cleared and a fresh set of information to be loaded from the corresponding XML file.

Here’s what the source of the PHP server script looks like PHP script, and here’s the server script actually running: map11.php?q=amap11.php?q=bmap11.php?q=c.

In a real application you could use a server side script to respond to a query based on user input or map position. The Javascript would construct a query string to be sent to the server containing all the relevant information and pass a URL something like ‘myserver.php?lat=-123.5&lng=44.2&zoom=11&selection=houses,schools,hotels’. The server would search the database for location information that matches the query and output XML code rather than HTML.

Here’s a really simple PHP script that reads this data file, finds the marker that’s “nearest” to the ?lat= &lng= parameters that are passed in the URL, and outputs the data as XML. [Somebody with more experience in PHP could probably write it a lot better than that].

Here’s that script in action map11a.php?lat=43.85&lng=-79.1

Non-AJAX Philosophy

There’s a temptation to write server side PHP or ASP script to generate the whole HTML page from scratch every time the data changes, generating a whole new set of HTML with the location specific information coded into Javascript commands. It works, but it means that a lot more data has to be sent from the server to the client, and the whole of the API code has to be reloaded, and, depending on the browser settings, it may mean that some or all of the map tiles, marker images and web page images get reloaded.

You can see the difference by reloading the example page, instead of clicking on the [A] icon.

Instant Maps

Google Maps API Tutorial

Instant maps with the Google Wizard

Google provides a Wizard which will generate a chunk of code that you can add to your own web page.

Here’s an example

Maps generated by the Wizard only show a single marker, and you don’t get any control over the contents of the info window.

The generated map will also have a Google AJAX Search API box, and direction finding (in a new maps.google.com window)

You don’t even have to sign up for an API key. The Wizard creates its own key for your domain.

Restrictions

The Wizard only works for locations that can be found with the Google AJAX Search API.

How to use it

  1. Go to the Wizard page and follow the three simple steps.
  2. Copy and paste the generated code into your own web page.Cut the code into two pieces. The bit that looks something like this can be placed anywhere on your page
      <div id="mapsearch">
        <span style="color:#676767;font-size:11px;margin:10px;padding:4px;">Loading...</span>
      </div>

    The rest of the code should be placed just before the </body> at the bottom of your page.

  3. Double-click your page to test it, then upload it to your website.

Customisation

You can make some minor changes to the behaviour and style of the map by studying the GSmapSearchControl documentation.

Google Maps API Tutorial

Google Maps API Tutorial

This tutorial is intended to help you create your own interactive maps using the Google API.

Do take a look at the Google documentation.

There are two ways to use this tutorial:

  1. Read it and try to understand the principles involved.
  2. Use the example files as templates. Paste the code into your own web page and change the API key and data. Read the “potential pitfalls” sections, and try to avoid them.

Using the Google Map API is not easy if you don’t have much Javascript experience.
If you find the Google documentation too difficult to understand, it’s not because it’s badly written it’s just that the subject is not easy.

Basic function

Heart Disease

Modern pacemakers usually have multiple functions. The most basic form monitors the heart’s native electrical rhythm. When the pacemaker fails to sense a heartbeat within a normal beat-to-beat time period, it will stimulate the ventricle of the heart with a short low voltage pulse. This sensing and stimulating activity continues on a beat by beat basis.
The more complex forms include the ability to sense and/or stimulate both the atrial and ventricular chambers.
I II III IV V
Chamber(s) paced Chamber(s) sensed Response to sensing Rate modulation Multisite pacing
O = None O = None O = None O = None O = None
A = Atrium A = Atrium T = Triggered R = Rate modulation A = Atrium
V = Ventricle V = Ventricle I = Inhibited V = Ventricle
D = Dual (A+V) D = Dual (A+V) D = Dual (T+I) D = Dual (A+V)

From this the basic ventricular “on demand” pacing mode is VVI or with automatic rate adjustment for exercise VVIR – this mode is suitable when no synchronization with the atrial beat is required, as in atrial fibrillation. The equivalent atrial pacing mode is AAI or AAIR which is the mode of choice when atrioventricular conduction is intact but the natural pacemaker the sinoatrial node is unreliable – sinus node disease (SND) or sick sinus syndrome. Where the problem is atrioventricular block (AVB) the pacemaker is required to detect (sense) the atrial beat and after a normal delay (0.1-0.2 seconds) trigger a ventricular beat, unless it has already happened – this is VDD mode and can be achieved with a single pacing lead with electrodes in the right atrium (to sense) and ventricle (to sense and pace). These modes AAIR and VDD are unusual in the US but widely used in Latin America and Europe.[19][20] The DDDR mode is most commonly used as it covers all the options though the pacemakers require separate atrial and ventricular leads and are more complex, requiring careful programming of their functions for