| 1 | <!DOCTYPE html> |
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| 2 | <html> |
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| 3 | <head> |
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| 4 | <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> |
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| 5 | <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0"> |
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| 6 | <meta name="apple-mobile-web-app-capable" content="yes"> |
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| 7 | <title>OpenLayers Mousewheel Interval Example</title> |
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| 8 | <link rel="stylesheet" href="../theme/default/style.css" type="text/css"> |
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| 9 | <link rel="stylesheet" href="style.css" type="text/css"> |
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| 10 | <script src="../lib/OpenLayers.js"></script> |
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| 11 | <script type="text/javascript"> |
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| 12 | var map, layer; |
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| 13 | |
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| 14 | function setCumulative() { |
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| 15 | var nav = map.getControlsByClass("OpenLayers.Control.Navigation")[0]; |
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| 16 | var cumulative = document.getElementById("cumulative"); |
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| 17 | nav.handlers.wheel.cumulative = cumulative.checked; |
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| 18 | } |
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| 19 | |
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| 20 | function init(){ |
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| 21 | map = new OpenLayers.Map( 'map', {controls: [ |
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| 22 | new OpenLayers.Control.Navigation( |
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| 23 | {mouseWheelOptions: {interval: 100}} |
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| 24 | ), |
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| 25 | new OpenLayers.Control.PanZoom(), |
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| 26 | new OpenLayers.Control.ArgParser(), |
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| 27 | new OpenLayers.Control.Attribution() |
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| 28 | ]} ); |
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| 29 | layer = new OpenLayers.Layer.WMS( "OpenLayers WMS", |
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| 30 | "http://vmap0.tiles.osgeo.org/wms/vmap0", |
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| 31 | {layers: 'basic'} ); |
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| 32 | map.addLayer(layer); |
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| 33 | map.zoomToMaxExtent(); |
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| 34 | } |
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| 35 | </script> |
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| 36 | </head> |
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| 37 | <body onload="init()"> |
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| 38 | <h1 id="title">OpenLayers Mousewheel Interval Example</h1> |
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| 39 | |
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| 40 | <div id="tags"> |
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| 41 | performance, zoom by wheel |
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| 42 | </div> |
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| 43 | |
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| 44 | <div id="shortdesc">Let OpenLayers send less tile requests to the server when wheel-zooming.</div> |
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| 45 | |
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| 46 | <div id="map" class="smallmap"></div> |
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| 47 | |
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| 48 | <div id="docs"> |
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| 49 | <p>This example shows how to configure the Navigation control to use |
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| 50 | the mousewheel in a less server resource consuming way: as long as you |
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| 51 | spin the mousewheel, no request will be sent to the server. Instead, |
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| 52 | the zoomlevel delta will be recorded. After a delay (in this example |
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| 53 | 100ms), a zoom action with the cumulated delta will be performed.</p> |
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| 54 | <div> |
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| 55 | <input id="cumulative" type="checkbox" checked="checked" |
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| 56 | onchange="setCumulative()"/> |
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| 57 | <label for="cumulative">Cumulative mode. If this mode is deactivated, |
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| 58 | only one zoom event will be performed after the delay.</label> |
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| 59 | </div> |
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| 60 | |
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| 61 | </div> |
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| 62 | </body> |
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| 63 | </html> |
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