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POClear WMS layer before redraw on OpenLayers
 

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    <p>I'm currently successfully displaying multiple layers using OpenLayers (Vector and WMS). My application allow the user to modify some parameters, which will :<br> * modify bound<br> * modify map center<br> * modify the WMS image<br> I use Ajax to avoid page reload, it works nicely, however when some layers take a while to load, the others which are not yet redrawn are still shown in the background (but aren't related at all to my new context). I would like to clear WMS layers (if possible) before re-asking the server for the new image but didn't find anything yet. I do this on the vector layer by calling removeAllFeature();</p> <p>Thanks for any help !</p> <p>Here is my pseudo-code when the user click the button :</p> <pre><code>$.getJSON("url/updateMapConfig.php", { data: $(this).serialize() , ajax: 'true', cache: 'false' }, function(j){ if (j.result == 'ok') { var layersToShow = []; // Refresh vector layer for(var i=0;i&lt;map.layers.length;i++) { if (map.layers[i].isVector) { map.layers[i].removeAllFeatures(); map.layers[i].refresh({force:true}); // Vector layer } } // Refresh visible layers for(var i=0;i&lt;map.layers.length;i++) { if (map.layers[i].visibility &amp;&amp; !map.layers[i].isBaseLayer &amp;&amp; !map.layers[i].isVector) { // Refresh visible non base map.layers[i].redraw(true); // Other layer } } // Set new bounds var bounds = new OpenLayers.Bounds(); bounds.extend(new OpenLayers.LonLat(j.bounds.xmin-100, j.bounds.ymin-100)); bounds.extend(new OpenLayers.LonLat(parseInt(j.bounds.xmax)+100, parseInt(j.bounds.ymax)+100)); map.zoomToExtent(bounds); // Move to destination point if (j.poiCenter != "") { eval("map.setCenter(new OpenLayers.LonLat("+j.poiCenter+"))"); } } } ); </code></pre>
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