Created
September 21, 2012 09:09
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OL ClientZoom & img loading
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| var map; | |
| function init() { | |
| map = new OpenLayers.Map('map'); | |
| var wms = new OpenLayers.Layer.WMS( | |
| "OpenLayers WMS", | |
| "http://vmap0.tiles.osgeo.org/wms/vmap0", | |
| {layers: 'basic'}, | |
| {serverResolutions: [1.40625,0.703125,0.3515625,0.17578125]} | |
| ); | |
| map.addLayers([wms]); | |
| // changing the blankImageUrl to a big orange star so that we easily see | |
| // that the valid src url is not loaded | |
| OpenLayers.Tile.Image.prototype.blankImageUrl = "data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAAKCAYAAACNMs+9AAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAAIdJREFUeNpi/D9VhwENqEDpO8iCLAyYYAKU9sGn0B6IvZHYB5EVmgGxMRT7IWlaDcSbgPgsCDMC3ZgDZExmwA9ymYDEFCCuwaMIJDeFCcppBeJ9WBTtg8oxMCEJCmFRyI/N13JA/AWIZ0H5aUCsiK6QB4i7gXg6EH+EijUBcSYQcwLxd4AAAwD5xRdUKc1DEwAAAABJRU5ErkJggg=="; | |
| map.zoomToMaxExtent(); | |
| map.zoomTo(4); | |
| function myFunction() { | |
| map.zoomTo(3); | |
| } | |
| window.setTimeout(myFunction, 400); | |
| } |
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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>Slow Client Zoom Example</title> | |
| <link rel="stylesheet" href="../theme/default/style.css" type="text/css"/> | |
| <link rel="stylesheet" href="style.css" type="text/css"> | |
| <script src="http://www.openlayers.org/dev/lib/OpenLayers.js"></script> | |
| <script src="clientzoom_slow.js"></script> | |
| <style> | |
| .olControlAttribution { | |
| bottom: 5px; | |
| } | |
| #map { | |
| width: 800px; | |
| height: 600px; | |
| } | |
| </style> | |
| </head> | |
| <body onload="init();"> | |
| <h1 id="title">Client Zoom</h1> | |
| <div id="tags"> | |
| client zoom continuous zooming | |
| </div> | |
| <div id="map"></div> | |
| </body> | |
| </html> |
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