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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
<meta name="apple-mobile-web-app-capable" content="yes">
<title>OpenLayers Event Handling</title>
<link rel="stylesheet" href="style.css" type="text/css">
<style type="text/css">
#panel {
margin: 5px;
height: 30px;
width: 200px;
}
#panel div {
float: left;
margin-left: 5px;
width: 25px;
height: 25px;
border: 1px solid gray;
}
#output {
position: absolute;
left: 550px;
top: 4em;
width: 350px;
height: 400px;
}
div.blueItemInactive {
background-color: #aac;
}
div.blueItemActive {
background-color: #33c;
}
div.orangeItemInactive {
background-color: #ca6;
}
div.orangeItemActive {
background-color: #ea0;
}
div.greenItemInactive {
background-color: #aca;
}
div.greenItemActive {
background-color: #3c3;
}
</style>
<script src="../lib/OpenLayers.js"></script>
<script type="text/javascript">
var map, panel;
function init(){
// define custom map event listeners
function mapEvent(event) {
log(event.type);
}
function mapBaseLayerChanged(event) {
log(event.type + " " + event.layer.name);
}
function mapLayerChanged(event) {
log(event.type + " " + event.layer.name + " " + event.property);
}
map = new OpenLayers.Map('map', {
eventListeners: {
"moveend": mapEvent,
"zoomend": mapEvent,
"changelayer": mapLayerChanged,
"changebaselayer": mapBaseLayerChanged
}
});
panel = new OpenLayers.Control.Panel(
{div: document.getElementById("panel")}
);
// define custom event listeners
function toolActivate(event) {
log("activate " + event.object.displayClass);
}
function toolDeactivate(event) {
log("deactivate " + event.object.displayClass);
}
// Multiple objects can share listeners with the same scope
var toolListeners = {
"activate": toolActivate,
"deactivate": toolDeactivate
};
var blue = new OpenLayers.Control({
type: OpenLayers.Control.TYPE_TOGGLE,
eventListeners: toolListeners,
displayClass: "blue"
});
var orange = new OpenLayers.Control({
type: OpenLayers.Control.TYPE_TOGGLE,
eventListeners: toolListeners,
displayClass: "orange"
});
var green = new OpenLayers.Control({
type: OpenLayers.Control.TYPE_TOGGLE,
eventListeners: toolListeners,
displayClass: "green"
});
// add buttons to a panel
panel.addControls([blue, orange, green]);
map.addControl(panel);
var vmap = new OpenLayers.Layer.WMS(
"OpenLayers WMS",
"http://vmap0.tiles.osgeo.org/wms/vmap0",
{layers: 'basic'}
);
var landsat = new OpenLayers.Layer.WMS(
"NASA Global Mosaic",
"http://t1.hypercube.telascience.org/cgi-bin/landsat7",
{layers: "landsat7"}
);
var nexrad = new OpenLayers.Layer.WMS(
"Nexrad",
"http://mesonet.agron.iastate.edu/cgi-bin/wms/nexrad/n0r.cgi",
{layers:"nexrad-n0r-wmst", transparent: "TRUE", format: 'image/png'},
{isBaseLayer: false}
);
map.addLayers([vmap, landsat, nexrad]);
map.addControl(new OpenLayers.Control.LayerSwitcher());
map.zoomToMaxExtent();
}
function log(msg) {
document.getElementById("output").innerHTML += msg + "\n";
}
</script>
</head>
<body onload="init()">
<h1 id="title">Event Handling</h1>
<div id="tags">
event, events, handler, listener, cleanup
</div>
<p id="shortdesc">
Demonstrating various styles of event handling in OpenLayers.
</p>
<div id="map" class="smallmap"></div>
<div id="panel"></div>
<textarea id="output"></textarea>
<div id="docs"></div>
</body>
</html>
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