e8960054a9
git-svn-id: http://svn.openlayers.org/trunk/openlayers@12082 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
64 lines
2.5 KiB
HTML
64 lines
2.5 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
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<meta name="apple-mobile-web-app-capable" content="yes">
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<title>OpenLayers Mousewheel Interval Example</title>
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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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var map, layer;
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function setCumulative() {
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var nav = map.getControlsByClass("OpenLayers.Control.Navigation")[0];
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var cumulative = document.getElementById("cumulative");
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nav.handlers.wheel.cumulative = cumulative.checked;
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}
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function init(){
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map = new OpenLayers.Map( 'map', {controls: [
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new OpenLayers.Control.Navigation(
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{mouseWheelOptions: {interval: 100}}
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),
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new OpenLayers.Control.PanZoom(),
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new OpenLayers.Control.ArgParser(),
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new OpenLayers.Control.Attribution()
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]} );
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layer = new OpenLayers.Layer.WMS( "OpenLayers WMS",
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"http://vmap0.tiles.osgeo.org/wms/vmap0",
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{layers: 'basic'} );
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map.addLayer(layer);
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map.zoomToMaxExtent();
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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">OpenLayers Mousewheel Interval Example</h1>
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<div id="tags">
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performance, zoom by wheel
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</div>
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<div id="shortdesc">Let OpenLayers send less tile requests to the server when wheel-zooming.</div>
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<div id="map" class="smallmap"></div>
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<div id="docs">
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<p>This example shows how to configure the Navigation control to use
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the mousewheel in a less server resource consuming way: as long as you
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spin the mousewheel, no request will be sent to the server. Instead,
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the zoomlevel delta will be recorded. After a delay (in this example
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100ms), a zoom action with the cumulated delta will be performed.</p>
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<div>
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<input id="cumulative" type="checkbox" checked="checked"
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onchange="setCumulative()"/>
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<label for="cumulative">Cumulative mode. If this mode is deactivated,
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only one zoom event will be performed after the delay.</label>
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</div>
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</div>
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</body>
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</html>
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