1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 | <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>OpenLayers Click Event Example</title> <link rel="stylesheet" href="../theme/default/style.css" type="text/css" /> <link rel="stylesheet" href="style.css" type="text/css" /> <script src="../lib/OpenLayers.js"></script> <script type="text/javascript"> OpenLayers.Control.Click = OpenLayers.Class(OpenLayers.Control, { defaultHandlerOptions: { 'single': true, 'double': false, 'pixelTolerance': 0, 'stopSingle': false, 'stopDouble': false }, initialize: function(options) { this.handlerOptions = OpenLayers.Util.extend( {}, this.defaultHandlerOptions ); OpenLayers.Control.prototype.initialize.apply( this, arguments ); this.handler = new OpenLayers.Handler.Click( this, { 'click': this.trigger }, this.handlerOptions ); }, trigger: function(e) { var lonlat = map.getLonLatFromViewPortPx(e.xy); alert("You clicked near " + lonlat.lat + " N, " + + lonlat.lon + " E"); } }); var map; function init(){ map = new OpenLayers.Map('map'); var ol_wms = new OpenLayers.Layer.WMS( "OpenLayers WMS", "http://labs.metacarta.com/wms/vmap0?", {layers: 'basic'} ); var jpl_wms = new OpenLayers.Layer.WMS( "NASA Global Mosaic", "http://t1.hypercube.telascience.org/cgi-bin/landsat7", {layers: "landsat7"}); jpl_wms.setVisibility(false); map.addLayers([ol_wms, jpl_wms]); map.addControl(new OpenLayers.Control.LayerSwitcher()); // map.setCenter(new OpenLayers.LonLat(0, 0), 0); map.zoomToMaxExtent(); var click = new OpenLayers.Control.Click(); map.addControl(click); click.activate(); } </script> </head> <body onload="init()"> <h1 id="title">Click Event Example</h1> <div id="tags"> </div> <p id="shortdesc"> This example shows the use of the click handler and getLonLatFromViewPortPx functions to trigger events on mouse click. </p> <div id="map" class="smallmap"></div> <div id="docs"> 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. </div> </body> </html> |