On Thu, Mar 26, 2009 at 12:07:42PM -0700, TrevorQuinn wrote:
>
> 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.
This is, I believe, expected behavior in all browser environments;
memory is primarily released across page loads. Within page loads, there
is little to no way to ensure that objects are released, as far as I'm
aware.
-- Chris
> 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>
> --
> View this message in context:
> http://n2.nabble.com/WFS%2C-memory%2C-and-IE-7-8-tp2540478p2540478.html
> Sent from the OpenLayers Users mailing list archive at Nabble.com.
>
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--
Christopher Schmidt
MetaCarta
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