Difference between revisions of "Linden Lab Official:Map API Advanced Examples"

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{{:API Portal/navigation}}
{{Supported API}}
{{:API Portal/navigation|map}}


See [http://slurl.com/examples/ Second Life Map API Examples] to see these examples in action.
See [http://slurl.com/examples/ Second Life Map API Examples] to see these examples in action.
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For example, the following method call will pop-up the window illustrated here; the user can the click the "Teleport" button to open the Second Life Viewer and teleport to (997,1002).   
For example, the following method call will pop-up the window illustrated here; the user can the click the "Teleport" button to open the Second Life Viewer and teleport to (997,1002).   


<pre>
<javascript>gotoSLURL(997,1002, mapInstance);</javascript>
gotoSLURL(997,1002, mapInstance);
</pre>


The example code below provides several similar examples.
The example code below provides several similar examples.
Line 25: Line 24:
'''Source code'''
'''Source code'''


<html4strict>
<html4strict><!-- Insert HTML header here -->
<!-- Insert HTML header here -->
<script>
<script>
var mapInstance;
var mapInstance;
Line 43: Line 41:


<a href="javascript:gotoSLURL(1000, 1000, mapInstance)"> Go to (1000, 1000) </a><br />
<a href="javascript:gotoSLURL(1000, 1000, mapInstance)"> Go to (1000, 1000) </a><br />
</body>
</body></html4strict>
</html4strict>


== Working with maps ==
== Working with maps ==
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To disable dragging on the map, simply call '''disableDragging()''' on the map object.
To disable dragging on the map, simply call '''disableDragging()''' on the map object.


<pre>
<javascript>mapInstance.disableDragging();</javascript>
mapInstance.disableDragging();
</pre>


When you are done  call '''enableDragging()''' on the map object to re-enable dragging.
When you are done  call '''enableDragging()''' on the map object to re-enable dragging.
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'''Example source code'''
'''Example source code'''


<pre>
<html4strict><!-- Insert common HTML header -->
<!-- Insert common HTML header -->
<script>
<script>
var mapInstance;
var mapInstance;
Line 170: Line 164:


<div id="map-container"></div>
<div id="map-container"></div>
</body>
</body></html4strict>
</pre>


=== Panning or re-centering the map ===
=== Panning or re-centering the map ===
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For example:  
For example:  


<pre>
<javascript>mapInstance.panOrRecenterToSLCoord(new XYPoint(1000, 1000), true);</javascript>
mapInstance.panOrRecenterToSLCoord(new XYPoint(1000, 1000), true);
</pre>


The above code pans or recenters the map to (1000, 1000) depending on the current view.  
The above code pans or recenters the map to (1000, 1000) depending on the current view.  
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'''Example source code'''
'''Example source code'''


<pre>
<html4strict><!-- Insert common HTML header -->  
<!-- Insert common HTML header -->  
<script>
<script>
var mapInstance;
var mapInstance;
Line 218: Line 208:


<div id="map-container"></div>
<div id="map-container"></div>
</body>
</body></html4strict>
</pre>


=== Setting the onStateChangedHandler event handler ===
=== Setting the onStateChangedHandler event handler ===
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The map object has an onStateChangedHandler option that is a function called whenever the user pans or zooms the map.  Specify it in the [[Webmap_API_Reference#SLMapOptions|options]] when you initially create the map object.  For example:
The map object has an onStateChangedHandler option that is a function called whenever the user pans or zooms the map.  Specify it in the [[Webmap_API_Reference#SLMapOptions|options]] when you initially create the map object.  For example:


<pre>
<javascript>mapInstance = new SLMap(document.getElementById('map-container'), {onStateChangedHandler: doSomething});</javascript>
mapInstance = new SLMap(document.getElementById('map-container'), {onStateChangedHandler: doSomething});
</pre>


Whenever the user zooms or pans the map, the Map API will call the doSomething function.  
Whenever the user zooms or pans the map, the Map API will call the doSomething function.  
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'''Example source code'''
'''Example source code'''


<pre>
<html4strict><!-- Insert common HTML header -->   
<!-- Insert common HTML header -->   
<script>
<script>
function loadmap() {
function loadmap() {
Line 252: Line 238:
<p>This map will display an alert whenever the map's state changes (i.e. the map is panned or zoomed)
<p>This map will display an alert whenever the map's state changes (i.e. the map is panned or zoomed)
<div id="map-container"></div>
<div id="map-container"></div>
</body>
</body></html4strict>
</pre>


=== Setting click and double-click event handlers ===
=== Setting click and double-click event handlers ===
You can define a double click event handler function, that gets called when the user double-clicks on the map.  For example:
You can define a double click event handler function, that gets called when the user double-clicks on the map.  For example:


<pre>
<javascript>// creates a function that we will bind to the double click action
// creates a function that we will bind to the double click action
var doubleClickHandlerFunction = function(x,y) {
var doubleClickHandlerFunction = function(x,y) {
   alert("you double clicked at (" + x + "," + y + ")");
   alert("you double clicked at (" + x + "," + y + ")");
Line 272: Line 256:
                             {doubleClickHandler: doubleClickHandlerFunction
                             {doubleClickHandler: doubleClickHandlerFunction
                             clickHandler: clickHandlerFunction});
                             clickHandler: clickHandlerFunction});
mapInstance.centerAndZoomAtSLCoord(new XYPoint(997.5, 1001.5), 2);
mapInstance.centerAndZoomAtSLCoord(new XYPoint(997.5, 1001.5), 2);</javascript>
</pre>


{{Hilite|This does not appear to work currently.}}
{{Hilite|This does not appear to work currently.}}
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'''Example source code'''
'''Example source code'''


<pre>
<html4strict><!-- Insert common HTML header -->
<!-- Insert common HTML header -->
<script>
<script>
function doubleClickHandlerFunction() {
function doubleClickHandlerFunction() {
Line 306: Line 288:
<p>There should be a yellow marker in the center of this map:
<p>There should be a yellow marker in the center of this map:
<div id="map-container"></div>
<div id="map-container"></div>
</body>
</body></html4strict>
</pre>


=== Getting current map center and bounds ===
=== Getting current map center and bounds ===
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'''Example source code'''
'''Example source code'''


<pre>
<html4strict><!-- Insert common HTML header -->
<!-- Insert common HTML header -->
<script>
<script>
var mapInstance;
var mapInstance;
Line 367: Line 347:
<p>Y-Max: <span id='yMax'></span></p>
<p>Y-Max: <span id='yMax'></span></p>
<div id="map-container"></div>
<div id="map-container"></div>
</body>
</body></html4strict>
</pre>


== Working with markers ==
== Working with markers ==
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Set these event handlers to Javascript functions when you construct the Map object.  For example:
Set these event handlers to Javascript functions when you construct the Map object.  For example:


<pre>
<javascript>// creates a function that we will bind to the marker click action
// creates a function that we will bind to the marker click action
var doMarkerAction = function(marker) {
var doMarkerAction = function(marker) {
   alert("an event occured at (" + marker.slCoord.x + "," + marker.slCoord.y + ")");
   alert("an event occured at (" + marker.slCoord.x + "," + marker.slCoord.y + ")");
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                         {clickHandler: doMarkerAction,  
                         {clickHandler: doMarkerAction,  
                         onMouseOutHandler: doMarkerAction,  
                         onMouseOutHandler: doMarkerAction,  
                         onMouseOverHandler: doMarkerAction});
                         onMouseOverHandler: doMarkerAction});</javascript>
</pre>


The code above simple sets all three event handlers of the marker to the '''doMarkerAction()''' function. The marker is passed as a parameter to this function.
The code above simple sets all three event handlers of the marker to the '''doMarkerAction()''' function. The marker is passed as a parameter to this function.
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'''Example source code'''
'''Example source code'''


<pre>
<html4strict><html>
<html>
<head>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
Line 463: Line 439:
<p>Click handler installed:
<p>Click handler installed:
<div id="map-container2"></div>
<div id="map-container2"></div>
</body>
</body></html4strict>
</pre>


<!--  
<!--  
Line 602: Line 577:
Call the map object's '''removeMarker()''' method to remove a marker, passing the marker object as the parameter.  For example:  
Call the map object's '''removeMarker()''' method to remove a marker, passing the marker object as the parameter.  For example:  


<pre>
<javascript>mapInstance.removeMarker(myMarker);</javascript>
mapInstance.removeMarker(myMarker);
</pre>


The above code removes the marker myMarker.
The above code removes the marker myMarker.
Line 611: Line 584:
'''Example source code'''
'''Example source code'''


<pre>
<html4strict><script>
<script>
<!-- Insert common HTML header -->
<!-- Insert common HTML header -->
// mapInstance and marker are global, so removeMarker() can access them.
// mapInstance and marker are global, so removeMarker() can access them.
Line 641: Line 613:
<a href="javascript: removeMarker();">Click to remove the yellow marker from the map</a>
<a href="javascript: removeMarker();">Click to remove the yellow marker from the map</a>
<div id="map-container"></div>
<div id="map-container"></div>
</body>
</body></html4strict>
</pre>


=== Triggering a marker click ===
=== Triggering a marker click ===
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For example:
For example:
<pre>
<javascript>// creates the icons
// creates the icons
var forsale_sign = new Img("forsale.png", 80, 83, true); // note how the fourth parameter is set true!
var forsale_sign = new Img("forsale.png", 80, 83, true); // note how the fourth parameter is set true!
var forsale_shadow = new Img("forsale-shadow.png", 98, 83, true);
var forsale_shadow = new Img("forsale-shadow.png", 98, 83, true);
Line 668: Line 638:
// creates the marker
// creates the marker
var marker = new Marker(all_images, new XYPoint(995, 1004));
var marker = new Marker(all_images, new XYPoint(995, 1004));
mapInstance.addMarker(marker);
mapInstance.addMarker(marker);</javascript>
</pre>


== Additional examples ==
== Additional examples ==
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=== Aligning marker images ===
=== Aligning marker images ===
<pre>
<html4strict><html>
<html>
<head>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
Line 769: Line 737:
<p>Marker icon aligned to bottom-right:
<p>Marker icon aligned to bottom-right:
<div id="map-container2"></div>
<div id="map-container2"></div>
</body>
</body></html4strict>
</pre>


=== Centering the map on a marker when user clicks it ===
=== Centering the map on a marker when user clicks it ===
<pre>
<html4strict><html>
<html>
<head>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
Line 828: Line 794:
<p>Clicking on this marker should center the map on the marker:
<p>Clicking on this marker should center the map on the marker:
<div id="map-container2"></div>
<div id="map-container2"></div>
</body>
</body></html4strict>
</pre>
 


=== Controlling marker z-order ===
=== Controlling marker z-order ===
<pre>
<html4strict><html>
<html>
<head>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
Line 903: Line 866:
<p>The '2' marker icon should be on top of the '1' marker icon:
<p>The '2' marker icon should be on top of the '1' marker icon:
<div id="map-container2"></div>
<div id="map-container2"></div>
</body>
</body></html4strict>
</pre>


=== Removing all markers from a map ===
=== Removing all markers from a map ===
<pre>
<html4strict><html>
<html>
<head>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
Line 958: Line 919:
<a href="javascript: mapInstance.removeAllMarkers();">Click to remove all the markers</a>
<a href="javascript: mapInstance.removeAllMarkers();">Click to remove all the markers</a>
<div id="map-container"></div>
<div id="map-container"></div>
</body>
</body></html4strict>
</pre>


'''Example source code'''
'''Example source code'''


<pre>
<html4strict><!-- Insert common HTML header -->
<!-- Insert common HTML header -->
<script>
<script>
function loadmap() {
function loadmap() {
Line 986: Line 945:
<p>The map shows a 'for sale' sign marker with smooth edges, and an anti-aliased shadow.
<p>The map shows a 'for sale' sign marker with smooth edges, and an anti-aliased shadow.
<div id="map-container"></div>
<div id="map-container"></div>
</body>
</body></html4strict>
</pre>


<!--
<!--

Latest revision as of 13:28, 4 May 2011

NOTE: This is an official Second Life API provided and documented by Linden Lab. Its use is subject to the API Terms of Use.

See Second Life Map API Examples to see these examples in action.

NOTE: This API is still in beta. URLs and API signatures may change. See the Release Notes for information on new features and known issues.

Linking to a Second Life coordinate (NEW)

Teleport window.png

The gotoSLURL() global function enables the user to teleport to the specified x,y coordinates, given a valid SLMap instance. It first opens a window displaying the region name and a "Teleport" button, for example as shown at right.



For example, the following method call will pop-up the window illustrated here; the user can the click the "Teleport" button to open the Second Life Viewer and teleport to (997,1002).

<javascript>gotoSLURL(997,1002, mapInstance);</javascript>

The example code below provides several similar examples.

Source code

<html4strict> <script> var mapInstance; function loadmap() { 

 // creates the map
 mapInstance = new SLMap(document.getElementById('map-container'));
 mapInstance.centerAndZoomAtSLCoord(new XYPoint(997, 1002), 2);

} </script> </head> <body onload="loadmap()" onunload="GUnload()">

Click on these links to be teleported into Second Life via a SLURL:

<a href="javascript:gotoSLURL(997, 1002, mapInstance)"> Go to (997, 1002) </a>(where the welcome fountain is)
<a href="javascript:gotoSLURL(996.5, 1001.6, mapInstance)"> Go to (996.5, 1001.6) </a>
<a href="javascript:gotoSLURL(1000, 1000, mapInstance)"> Go to (1000, 1000) </a>
</body></html4strict>

Working with maps

The SLMap object provides a great deal of control over how you display and interact with the map. You can:

  • Customize the zoom and pan controls.
  • Disable and enable dragging the map.
  • Pan/re-center the map to a specified location.
  • Define event handler functions, called when:
    • The user zooms or pans the map.
    • The user clicks on the map.
    • The user double-clicks on the map.
  • Get the cooridnates of the map's center and bounds.

See Second Life Map API Examples to see these examples in action.

Customizing zoom and pan controls

It's easy to remove all the zoom and pan controls or create your own. When you create the SLMap object, simply specify false for the SLMapOptions properties hasZoomControls and hasPanningControls, for example:

<javascript>mapInstance = new SLMap(document.getElementById('map-container'), 

                       {hasZoomControls: false, 
                        hasPanningControls: false});</javascript>

This code creates a map with no zoom and pan controls.

To create your own zoom controls use the SLMap methods:

  • setCurrentZoomLevel()
  • getCurrentZoomLevel()
  • zoomIn()
  • zoomOut()

To create your own panning controls, use the SLMap methods:

  • panLeft()
  • panRight()
  • panUp()
  • panDown()

The following example contains a set of anchored links that call a function when clicked.

Example source code

<html4strict> <script> var mapInstance;

function loadmap() { 

 // creates the map
 mapInstance = new SLMap(document.getElementById('map-container'), 
                         {hasZoomControls: false, hasPanningControls: false});
 mapInstance.centerAndZoomAtSLCoord(new XYPoint(997, 1002), 2);
 
 (document.getElementById('zoom_level')).innerHTML = mapInstance.getCurrentZoomLevel();

}

function setZoom(level) { 

 mapInstance.setCurrentZoomLevel(level);
 (document.getElementById('zoom_level')).innerHTML = mapInstance.getCurrentZoomLevel();

}

function zoomIn() { 

 mapInstance.zoomIn();
 (document.getElementById('zoom_level')).innerHTML = mapInstance.getCurrentZoomLevel();

}

function zoomOut() { 

 mapInstance.zoomOut();
 (document.getElementById('zoom_level')).innerHTML = mapInstance.getCurrentZoomLevel();

} </script> </head> <body onload="loadmap()" onunload="GUnload()">

This map has the usual pan/zoom controls disabled, and the hyperlinks below implement custom pan/zoom controls via SLMap Javascript calls.

Set the zoom level

The Current Zoom Level is

<a href="javascript: setZoom(1);">1</a> <a href="javascript: setZoom(2);">2</a> <a href="javascript: setZoom(3);">3</a> <a href="javascript: setZoom(4);">4</a> <a href="javascript: setZoom(5);">5</a> <a href="javascript: setZoom(6);">6</a> <a href="javascript: setZoom(7);">7</a> <a href="javascript: setZoom(8);">8</a> <a href="javascript: zoomIn();">zoom in</a> <a href="javascript: zoomOut();">zoom out</a>

Pan Around

<a href="javascript: mapInstance.panLeft();">left</a> <a href="javascript: mapInstance.panRight();">right</a> <a href="javascript: mapInstance.panUp();">up</a> <a href="javascript: mapInstance.panDown();">down</a>

</body></html4strict>

Disabling and enabling dragging

To disable dragging on the map, simply call disableDragging() on the map object.

<javascript>mapInstance.disableDragging();</javascript>

When you are done call enableDragging() on the map object to re-enable dragging.

Example source code

<html4strict> <script> var mapInstance;

function loadmap() { 

 mapInstance = new SLMap(document.getElementById('map-container'));
 mapInstance.centerAndZoomAtSLCoord(new XYPoint(997, 1002), 2);

}

</script> </head> <body onload="loadmap()" onunload="GUnload()">

<a href="javascript: mapInstance.disableDragging();">Click to disable dragging map</a>

<a href="javascript: mapInstance.enableDragging();">Click to enable dragging map</a>

</body></html4strict>

Panning or re-centering the map

Use the map object's panOrRecenterToSLCoord() method to pan the map to a specific point, providing the following parameters:

  • An XYPoint object, that identifies a specific x, y point.
  • Whether to recenter the map if the specified point is not currently visible. This parameter is optional and defaults to false.

For example:

<javascript>mapInstance.panOrRecenterToSLCoord(new XYPoint(1000, 1000), true);</javascript>

The above code pans or recenters the map to (1000, 1000) depending on the current view.

Example source code

<html4strict> <script> var mapInstance;

function loadmap() { 

 // creates the map
 mapInstance = new SLMap(document.getElementById('map-container'));
 mapInstance.centerAndZoomAtSLCoord(new XYPoint(998.5, 1001), 2);
 
 var mapWindow1 = new MapWindow("This is (997, 1002)");
 var mapWindow2 = new MapWindow("This is (1000, 1000)");
 var mapWindow3 = new MapWindow("This is (1010.5, 1000.5)");
 
 mapInstance.addMapWindow(mapWindow1, new XYPoint(997, 1002));
 mapInstance.addMapWindow(mapWindow2, new XYPoint(1000, 1000));
 mapInstance.addMapWindow(mapWindow3, new XYPoint(1010.5, 1000.5));

}

</script> </head> <body onload="loadmap()" onunload="GUnload()">

Click the links to pan or re-center the map on the indicated co-ordinates:

<a href="javascript: mapInstance.panOrRecenterToSLCoord(new XYPoint(1000, 1000), true);"> Pan or recenter to (1000, 1000)</a>

<a href="javascript: mapInstance.panOrRecenterToSLCoord(new XYPoint(1010.5, 1000.5), true);"> Pan or recenter to (1010.5, 1000.5)</a>

</body></html4strict>

Setting the onStateChangedHandler event handler

The map object has an onStateChangedHandler option that is a function called whenever the user pans or zooms the map. Specify it in the options when you initially create the map object. For example:

<javascript>mapInstance = new SLMap(document.getElementById('map-container'), {onStateChangedHandler: doSomething});</javascript>

Whenever the user zooms or pans the map, the Map API will call the doSomething function.

This feature is handy when you want to show markers only currently in the user's viewport: in the event handler function, simply remove all the current markers, then place a new set of markers on the map based on the current map bounds.

Example source code

<html4strict> <script> function loadmap() { 

 // creates the map
 mapInstance = new SLMap(document.getElementById('map-container'), 
                         {onStateChangedHandler: doSomething});
 mapInstance.centerAndZoomAtSLCoord(new XYPoint(997, 1002), 2);

} function doSomething() { 

 alert("The map state has changed!!");

} </script> </head> <body onload="loadmap()" onunload="GUnload()">

This map will display an alert whenever the map's state changes (i.e. the map is panned or zoomed)

</body></html4strict>

Setting click and double-click event handlers

You can define a double click event handler function, that gets called when the user double-clicks on the map. For example:

<javascript>// creates a function that we will bind to the double click action var doubleClickHandlerFunction = function(x,y) { 

 alert("you double clicked at (" + x + "," + y + ")");

};

var clickHandlerFunction = function(x,y) { 

 alert("you double clicked at (" + x + "," + y + ")");

};

// creates the map var mapInstance = new SLMap(document.getElementById('map-container'), 

                           {doubleClickHandler: doubleClickHandlerFunction
                            clickHandler: clickHandlerFunction});

mapInstance.centerAndZoomAtSLCoord(new XYPoint(997.5, 1001.5), 2);</javascript>

This does not appear to work currently.

The above code pops up a Javascript alert box showing the X and Y coordinate clicked. The X and Y coordinate will be passed as parameters to event handler functions. Is this still true?

Example source code

<html4strict> <script> function doubleClickHandlerFunction() { 

     alert("You double-clicked!")

}

function clickHandlerFunction() { 

     alert("You clicked!")

}

function loadmap() { 

 // creates the map
 var mapInstance = new SLMap(document.getElementById('map-container'),
                             {doubleClickHandler: doubleClickHandlerFunction,
                               clickHandler: clickHandlerFunction});

 mapInstance.centerAndZoomAtSLCoord(new XYPoint(997, 1002), 2);

}

</script> <body onload="loadmap()" onunload="GUnload()">

There should be a yellow marker in the center of this map:

</body></html4strict>

Getting current map center and bounds

Use the map object's getViewportBounds() method to get the bounds of the map. This method returns a Bounds object that has xMin, xMax, yMin, and yMax properties for the current viewport. For example: 

var bounds = mapInstance.getViewportBounds();

Use the map object's getMapCenter() method to get the coordinates of map. This method returns an XYPoint object representing the center of the map. For example: 

var center = mapInstance.getMapCenter();

These methods are handy to display only markers inside the current map viewport, or display markers based on the proximity from the map center.

Example source code

<html4strict> <script> var mapInstance;

function loadmap() { 

 // creates the map
 mapInstance = new SLMap(document.getElementById('map-container'));
 mapInstance.centerAndZoomAtSLCoord(new XYPoint(998.5, 1001), 2);
 
 var mapWindow1 = new MapWindow("This is (997, 1002)");
 var mapWindow2 = new MapWindow("This is (1000, 1000)");
 var mapWindow3 = new MapWindow("This is (1020, 1020)");
 
 mapInstance.addMapWindow(mapWindow1, new XYPoint(997, 1002));
 mapInstance.addMapWindow(mapWindow2, new XYPoint(1000, 1000));
 mapInstance.addMapWindow(mapWindow3, new XYPoint(1020, 1020)); 
 
 checkBounds();

}

function checkBounds() { 

 var bounds = mapInstance.getViewportBounds();
 var center = mapInstance.getMapCenter();
 
 document.getElementById('cent').innerHTML = "(" + center.x + "," + center.y + ")";
 document.getElementById('xMin').innerHTML = bounds.xMin;
 document.getElementById('xMax').innerHTML = bounds.xMax;
 document.getElementById('yMin').innerHTML = bounds.yMin;
 document.getElementById('yMax').innerHTML = bounds.yMax;

} </script> </head> <body onload="loadmap()" onunload="GUnload()">

Drag/zoom the map and then <a href="javascript: checkBounds();">click here</a> to check the current viewport bounds and center coordinate

Center:

X-Min:

X-Max:

Y-Min:

Y-Max:

</body></html4strict>

Working with markers

The Marker object displays a small image at a particular x, y point on the map.

See Second Life Map API Examples to see these examples in action.

Setting a marker's event handlers

The Marker object has three event handlers:

  • clickHandler - function called when user clicks on the marker.
  • mouseOverHandler - function called when user moves mouser pointer over marker.
  • mouseOutHandler - function called when user moves mouse pointer off marker.

Set these event handlers to Javascript functions when you construct the Map object. For example:

<javascript>// creates a function that we will bind to the marker click action var doMarkerAction = function(marker) { 

 alert("an event occured at (" + marker.slCoord.x + "," + marker.slCoord.y + ")");

};

// creates the marker and sets its event handlers var marker = new Marker(all_images, 

                       new XYPoint(997, 1002), 
                       {clickHandler: doMarkerAction, 
                        onMouseOutHandler: doMarkerAction, 
                        onMouseOverHandler: doMarkerAction});</javascript>

The code above simple sets all three event handlers of the marker to the doMarkerAction() function. The marker is passed as a parameter to this function.

Example source code

<html4strict><html> <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <style> div#map-container1 { 

     width: 400px;
     height: 400px;

}

div#map-container2 { 

     width: 400px;
     height: 400px;

} </style>

<script src="http://maps.google.com/maps?file=api&v=2&key=[GOOGLE MAP API KEY]" 

 type="text/javascript"></script>

<script src="http://slurl.com/_scripts/slmapapi.js" type="text/javascript"></script> <script> // mapInstance and marker is set as a global, so that the removeMarker function can access them var mapInstance, marker;

var myClickHandler = function(marker) { 

   alert("Click handler for marker at ("+ marker.slCoord.x + ", " + marker.slCoord.y + ")");

}

function loadmap() { 

 // create the icons for use as a marker
 var yellow_dot_image = new Img("b_map_yellow.gif", 9, 9);
 var yellow_icon = new Icon(yellow_dot_image);
 var all_images = [yellow_icon, yellow_icon, yellow_icon, yellow_icon, yellow_icon, yellow_icon];
 
 // First map
 mapInstance1 = new SLMap(document.getElementById('map-container1'));
 mapInstance1.centerAndZoomAtSLCoord(new XYPoint(997, 1002), 2);
 
 // creates the marker
 marker1 = new Marker(all_images, new XYPoint(997, 1002));
 mapInstance1.addMarker(marker1);

 // Second map
 mapInstance2 = new SLMap(document.getElementById('map-container2'));
 mapInstance2.centerAndZoomAtSLCoord(new XYPoint(997, 1002), 2);
 
 // creates the marker
 marker2 = new Marker(all_images, new XYPoint(997, 1002), {clickHandler: myClickHandler});
 mapInstance2.addMarker(marker2);

} </script> </head> <body onload="loadmap()" onunload="GUnload()">

No clickhandler (default):

Click handler installed:

</body></html4strict>


Removing a marker

Call the map object's removeMarker() method to remove a marker, passing the marker object as the parameter. For example:

<javascript>mapInstance.removeMarker(myMarker);</javascript>

The above code removes the marker myMarker.


Example source code

<html4strict><script> // mapInstance and marker are global, so removeMarker() can access them. var mapInstance, marker;

function loadmap() { 

 // Creates the map
 mapInstance = new SLMap(document.getElementById('map-container'));
 mapInstance.centerAndZoomAtSLCoord(new XYPoint(997, 1002), 2);
 
 // Creates the icons
 var yellow_dot_image = new Img("b_map_yellow.gif", 9, 9);
 var yellow_icon = new Icon(yellow_dot_image);
 var all_images = [yellow_icon, yellow_icon, yellow_icon, yellow_icon, yellow_icon, yellow_icon];
 
 // Creates the marker
 marker = new Marker(all_images, new XYPoint(997, 1002));
 mapInstance.addMarker(marker);

}

function removeMarker() { 

 // Removes the marker
 mapInstance.removeMarker(marker);

} </script> </head> <body onload="loadmap()" onunload="GUnload()"> <a href="javascript: removeMarker();">Click to remove the yellow marker from the map</a>

</body></html4strict>

Triggering a marker click

To simulate clicking on a marker, use the Map object's clickMarker() method, passing the marker as the parameter. For example: 

mapInstance.clickMarker(marker);

This method can come in handy if you are listing links somewhere else on the page, and want links to open up markers with more information.

Creating markers with shadows

You can use a PNG image to make a marker appear to have a "shadow." To do this:

  • Create two Img objects, one for the marker image and one for the shadow image.
  • When creating the Img objects, provide "true" as the fourth argument to the constructor, indicating to create the image with an alpha channel (which provides transparency).
  • When creating the Icon object, provide both Img objects as arguments to the constructor.

For example: <javascript>// creates the icons var forsale_sign = new Img("forsale.png", 80, 83, true); // note how the fourth parameter is set true! var forsale_shadow = new Img("forsale-shadow.png", 98, 83, true); var forsale_icon = new Icon(forsale_sign, forsale_shadow); var all_images = [forsale_icon, forsale_icon, forsale_icon, forsale_icon, forsale_icon, forsale_icon];

// creates the marker var marker = new Marker(all_images, new XYPoint(995, 1004)); mapInstance.addMarker(marker);</javascript>

Additional examples

See Second Life Map API Examples to see these examples in action.


Aligning marker images

<html4strict><html> <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <style> div#map-container1 { 

     width: 400px;
     height: 400px;

}

div#map-container2 { 

     width: 400px;
     height: 400px;

} </style>

<script src="http://maps.google.com/maps?file=api&v=2&key=[GOOGLE MAP KEY]" 

 type="text/javascript"></script>

<script src="http://slurl.com/_scripts/slmapapi.js" type="text/javascript"></script> <script> // mapInstance and marker is set as a glabal, so that the removeMarker function can access them var mapInstance, marker;

function loadmap() { 

 // create the icons for use as a marker
 var yellow_dot_image = new Img("b_map_yellow.gif", 9, 9);
 var yellow_icon = new Icon(yellow_dot_image);
 var all_images = [yellow_icon, yellow_icon, yellow_icon, yellow_icon, yellow_icon, yellow_icon];
 
 // First map
 mapInstance1 = new SLMap(document.getElementById('map-container1'));
 mapInstance1.centerAndZoomAtSLCoord(new XYPoint(997, 1002), 2);
 
 // creates the marker
 marker1 = new Marker(all_images, new XYPoint(997,1002),
                       {verticalAlign: "top", horizontalAlign: "left"});
 mapInstance1.addMarker(marker1);

 // Second map
 mapInstance2 = new SLMap(document.getElementById('map-container2'));
 mapInstance2.centerAndZoomAtSLCoord(new XYPoint(997, 1002), 2);
 
 // creates the marker
 marker2 = new Marker(all_images, new XYPoint(997,1002), 
                       {verticalAlign: "bottom", horizontalAlign: "right"});
 mapInstance2.addMarker(marker2);

} </script> </head> <body onload="loadmap()" onunload="GUnload()">

Marker icon aligned to top-left:

Marker icon aligned to bottom-right:

</body></html4strict>

Centering the map on a marker when user clicks it

<html4strict><html> <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <style> div#map-container1 { 

     width: 400px;
     height: 400px;

}

div#map-container2 { 

     width: 400px;
     height: 400px;

} </style>

<script src="http://maps.google.com/maps?file=api&v=2&key=[GOOGLE MAP KEY]" 

 type="text/javascript"></script>

<script src="http://slurl.com/_scripts/slmapapi.js" type="text/javascript"></script> <script> // mapInstance and marker is set as a glabal, so that the removeMarker function can access them var mapInstance, marker;

function loadmap() { 

 // create the icons for use as a marker
 var yellow_dot_image = new Img("b_map_yellow.gif", 9, 9);
 var yellow_icon = new Icon(yellow_dot_image);
 var all_images = [yellow_icon, yellow_icon, yellow_icon, yellow_icon, yellow_icon, yellow_icon];
 
 // First map
 mapInstance1 = new SLMap(document.getElementById('map-container1'));
 mapInstance1.centerAndZoomAtSLCoord(new XYPoint(996,1001),2);
 
 // creates the marker
 marker1 = new Marker(all_images, new XYPoint(997,1002));
 mapInstance1.addMarker(marker1);

 // Second map
 mapInstance2 = new SLMap(document.getElementById('map-container2'));
 mapInstance2.centerAndZoomAtSLCoord(new XYPoint(996,1001),2);
 
 // creates the marker
 marker2 = new Marker(all_images, new XYPoint(997,1002), {centerOnClick: true});
 mapInstance2.addMarker(marker2);

} </script> </head> <body onload="loadmap()" onunload="GUnload()">

Clicking on this marker should have no effect:

Clicking on this marker should center the map on the marker:

</body></html4strict>

Controlling marker z-order

<html4strict><html> <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <style> div#map-container1 { 

     width: 400px;
     height: 400px;

}

div#map-container2 { 

     width: 400px;
     height: 400px;

} </style>

<script src="http://maps.google.com/maps?file=api&v=2&key=[GOOGLE MAP KEY]" 

 type="text/javascript"></script>

<script src="http://slurl.com/_scripts/slmapapi.js" type="text/javascript"></script> <script> // mapInstance and marker is set as a glabal, so that the removeMarker function can access them var mapInstance, marker;

function loadmap() { 

 // create the icons for use as a marker
 var marker1_image = new Img("marker_1.gif", 64, 64);
 var marker1_icon = new Icon(marker1_image);
 var marker1_images = [marker1_icon, marker1_icon, marker1_icon, marker1_icon, marker1_icon, marker1_icon];
 
 var marker2_image = new Img("marker_2.gif", 64, 64);
 var marker2_icon = new Icon(marker2_image);
 var marker2_images = [marker2_icon, marker2_icon, marker2_icon, marker2_icon, marker2_icon, marker2_icon];
 
 // First map
 var mapInstance1 = new SLMap(document.getElementById('map-container1'));
 mapInstance1.centerAndZoomAtSLCoord(new XYPoint(997, 1002), 2);
 
 // creates the marker
 var marker1a = new Marker(marker1_images, new XYPoint(997, 1002),
                       {zLayer: 1});
 mapInstance1.addMarker(marker1a);

 var marker1b = new Marker(marker2_images, new XYPoint(997.15, 1002.15),
                       {zLayer: 0});
 mapInstance1.addMarker(marker1b);

 // Second map
 mapInstance2 = new SLMap(document.getElementById('map-container2'));
 mapInstance2.centerAndZoomAtSLCoord(new XYPoint(997, 1002), 2);
 
 // creates the marker
 var marker2a = new Marker(marker1_images, new XYPoint(997, 1002),
                       {zLayer: 0});
 mapInstance2.addMarker(marker2a);

 var marker2b = new Marker(marker2_images, new XYPoint(997.15, 1002.15),
                       {zLayer: 1});
 mapInstance2.addMarker(marker2b);

} </script> </head> <body onload="loadmap()" onunload="GUnload()">

The '1' marker icon should be on top of the '2' marker icon:

The '2' marker icon should be on top of the '1' marker icon:

</body></html4strict>

Removing all markers from a map

<html4strict><html> <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <style> div#map-container { 

     width: 500px;
     height: 500px;

} </style>

<script src="http://maps.google.com/maps?file=api&v=2&key=[GOOGLE MAP KEY]" 

 type="text/javascript"></script>

<script src="http://slurl.com/_scripts/slmapapi.js" type="text/javascript"></script> <script> // mapInstance and marker is set as a glabal, so that the removeMarker function can access them var mapInstance, marker;

function loadmap() { 

 // creates the map
 mapInstance = new SLMap(document.getElementById('map-container'));
 mapInstance.centerAndZoomAtSLCoord(new XYPoint(997, 1002), 2);
 
 // creates the icons
 var yellow_dot_image = new Img("b_map_yellow.gif", 9, 9);
 var yellow_icon = new Icon(yellow_dot_image);
 var all_images = [yellow_icon, yellow_icon, yellow_icon, yellow_icon, yellow_icon, yellow_icon];
 
 // creates the markers
 var marker = new Marker(all_images, new XYPoint(997,1002));
 mapInstance.addMarker(marker);
 marker = new Marker(all_images, new XYPoint(997.4,1002));
 mapInstance.addMarker(marker);
 marker = new Marker(all_images, new XYPoint(997.2,1002.8));
 mapInstance.addMarker(marker);
 marker = new Marker(all_images, new XYPoint(997.8,1002.2));
 mapInstance.addMarker(marker);
 marker = new Marker(all_images, new XYPoint(997.1,1002.65));
 mapInstance.addMarker(marker);

}

function removeAllMarkers() { 

 // removes all the the marker
 mapInstance.removeAllMarkers();

} </script> </head> <body onload="loadmap()" onunload="GUnload()"> <a href="javascript: mapInstance.removeAllMarkers();">Click to remove all the markers</a>

</body></html4strict>

Example source code

<html4strict> <script> function loadmap() { 

 // creates the map
 var mapInstance = new SLMap(document.getElementById('map-container'));
 mapInstance.centerAndZoomAtSLCoord(new XYPoint(995,1004),2);
 
 // creates the icons
 var forsale_sign = new Img("forsale.png",80,83, true);
 var forsale_shadow = new Img("forsale-shadow.png", 98, 83, true);
 var forsale_icon = new Icon(forsale_sign, forsale_shadow);
 var all_images = [forsale_icon, forsale_icon, forsale_icon, forsale_icon, forsale_icon, forsale_icon];
 
 // creates the marker
 var marker = new Marker(all_images, new XYPoint(995, 1004));
 mapInstance.addMarker(marker);

} </script> </head> <body onload="loadmap()" onunload="GUnload()">

The map shows a 'for sale' sign marker with smooth edges, and an anti-aliased shadow.

</body></html4strict>


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