Hi,
2000+ features is way too much for rendering in the browser.
if you use mapserver already, then you can also query the layer as WMS
layer, using sld_body with a filter. If your query is complex, use
Layer.WMS.Post instead of Layer.WMS to avoid urls that are too long for IE.
Regards,
Andreas.
On 2010-01-06 16:29, steve.tout...@inspq.qc.ca wrote:
>
> Hi,
> I created a WMS (mapserver) layer containing 13400 polygons. It loads
> in less then 3 seconds. Good.
>
> I need to develop a tool for the user so he can create a custom query
> on this layer to retreive specific polygons. In a form, the user
> select the parameters and launch the request. Here is the code below.
> That works, but it takes minutes to render. Per example, a query that
> returns 2482 polygons, In firebug I see that the query runs in less
> then 2 seconds.
> But, It seems that the creation of the geometries is an heavy task. I
> get this warning in FF
>
>
> I click on Continue several times and then I get geometries in the map.
>
> I guess 2482 polygons is simply too much for a vector layer. If that
> is the case, is there another format then GeoJson I could use? Maybe
> my approach is totally wrong...
>
> Any comments would be appreciated.
> Thanks for your help,
> Steve
>
> The code used:
>
> Ext.Ajax.request({
> url: 'requeteVulnerabilite.php',
> method:'POST',
> params: { inddef: cb_inddefValue},
> failure: function(){alert("Ca pas marché");},
> success: function(result, request )
> {
> //alert(result.responseText);
> vulnerabiliteLayer.destroyFeatures();
> var features = new
> OpenLayers.Format.GeoJSON({'internalProjection':map.baseLayer.projection,'externalProjection':map.baseLayer.projection
>
>
> }).read(result.responseText);
> var bounds;
> if(features)
> {
> if(features.constructor != Array) {
> features = [features];
> }
> for(var i=0; i<features.length; ++i) {
> if (!bounds) {
> bounds =
> features[i].geometry.getBounds();
> } else {
>
> bounds.extend(features[i].geometry.getBounds());
> }
> }
> vulnerabiliteLayer.addFeatures(features);
> map.zoomToExtent(bounds);
> }
>
> }
> });
>
>
>
>
> /Steve Toutant, M. Sc./
> Analyste en géomatique
> Secteur environnement
> Direction de la santé environnementale et de la toxicologie
> Institut national de santé publique du Québec
> 945, avenue Wolfe
> Québec, Qc G1V 5B3
>
> Tél.: (418) 650-5115 #5281
> Fax.: (418) 654-3144_
> __steve.tout...@inspq.qc.ca_ <mailto:steve.tout...@inspq.qc.ca>_
> __http://www.inspq.qc.ca_ <http://www.inspq.qc.ca/>
>
>
>
>
> _______________________________________________
> Users mailing list
> Users@openlayers.org
> http://openlayers.org/mailman/listinfo/users
>
--
Andreas Hocevar
OpenGeo - http://opengeo.org/
Expert service straight from the developers.
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