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<html xmlns="http://www.w3.org/1999/xhtml"> |
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<head> |
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<title>OpenLayers Click Event Example</title> |
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|
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<link rel="stylesheet" href="../theme/default/style.css" type="text/css" /> |
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<link rel="stylesheet" href="style.css" type="text/css" /> |
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<script src="../lib/OpenLayers.js"></script> |
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<script type="text/javascript"> |
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OpenLayers.Control.Click = OpenLayers.Class(OpenLayers.Control, { |
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defaultHandlerOptions: { |
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'single': true, |
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'double': false, |
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'pixelTolerance': 0, |
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'stopSingle': false, |
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'stopDouble': false |
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}, |
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|
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initialize: function(options) { |
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this.handlerOptions = OpenLayers.Util.extend( |
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{}, this.defaultHandlerOptions |
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); |
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OpenLayers.Control.prototype.initialize.apply( |
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this, arguments |
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); |
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this.handler = new OpenLayers.Handler.Click( |
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this, { |
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'click': this.trigger |
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}, this.handlerOptions |
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); |
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}, |
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|
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trigger: function(e) { |
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var lonlat = map.getLonLatFromViewPortPx(e.xy); |
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alert("You clicked near " + lonlat.lat + " N, " + |
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+ lonlat.lon + " E"); |
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} |
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|
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}); |
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var map; |
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function init(){ |
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map = new OpenLayers.Map('map'); |
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|
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var ol_wms = new OpenLayers.Layer.WMS( "OpenLayers WMS", |
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"http://labs.metacarta.com/wms/vmap0?", {layers: 'basic'} ); |
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|
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var jpl_wms = new OpenLayers.Layer.WMS( "NASA Global Mosaic", |
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"http://t1.hypercube.telascience.org/cgi-bin/landsat7", |
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{layers: "landsat7"}); |
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jpl_wms.setVisibility(false); |
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map.addLayers([ol_wms, jpl_wms]); |
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map.addControl(new OpenLayers.Control.LayerSwitcher()); |
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|
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map.zoomToMaxExtent(); |
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|
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var click = new OpenLayers.Control.Click(); |
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map.addControl(click); |
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click.activate(); |
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|
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} |
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</script> |
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</head> |
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<body onload="init()"> |
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<h1 id="title">Click Event Example</h1> |
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|
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<div id="tags"> |
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</div> |
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|
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<p id="shortdesc"> |
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This example shows the use of the click handler and getLonLatFromViewPortPx functions to trigger events on mouse click. |
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</p> |
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|
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<div id="map" class="smallmap"></div> |
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|
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<div id="docs"> |
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Using the Click handler allows you to (for example) catch clicks without catching double clicks, something that standard browser events don't do for you. (Try double clicking: you'll zoom in, whereas using the browser click event, you would just get two alerts.) This example click control shows you how to use it. |
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</div> |
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</body> |
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</html> |
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