I've got an OpenLayers application that uses WFS heavily, and I see a steady
increase in the memory footprint of IE7 and IE8 over time when I use the
application.
Memory usage grows when new WFS features and attributes are loaded, which
happens each time the users pans or zooms to a new area. I'd like the
application to discard all the previous view's features and free up resources
each time the map is panned or zoomed, but it doesn't look like this is
happening, despite a call to WFS.destroyFeatures(). As the user pans and zooms,
memory usage always goes up, never down.
As an experiment, I tried to create a simple map with a WFS layer and a button
that destroys and rebuilds the map (code snippet below). Each time I click the
button, memory use goes up in IE7 and IE8. It looks like the map resources are
never released.
Can anyone offer suggestions on how to free up memory when using WFS with
Internet Explorer?
Code snippet:
var init = function() {
...
this.olMap = new OpenLayers.Map('map', this.mapOptions);
this.olMap.addLayer(this.wms);
this.olMap.addLayer(this.wfs);
var bounds = new OpenLayers.Bounds(-13617640.95107214,
4551675.8443209315,
-13608257.831193173, 4558220.8066184);
this.olMap.zoomToExtent(bounds);
};
var redraw = function() {
this.wfs.destroyFeatures();
this.wfs.destroy();
this.wms.destroy();
this.olMap.destroy();
this.init();
};
...
<body onload="init();">
<div id="map" style="height: 700px; width: 1000px"></div>
<form>
<input type="button" onclick="redraw();" name="Redraw" value="Redraw" />
</form>
</body>
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