[OpenLayers-Users] Highlight features in WMS Layer

[Phil Scadden]

> control: new OpenLayers.Control.SLDSelect(
> OpenLayers.Handler.Polygon, {
>     displayClass: 'olControlSLDSelectPolygon',
>     layers: features,

"features" need to be layer you are doing the select on - it should be a 
WMS layer since SLDSelect works on WMS layers.

>     eventListeners: {
>         "selected": function (evt) {
>             //features.removeFeatures();
>             var pfilter = new OpenLayers.Filter.Spatial({
>                 type: OpenLayers.Filter.Spatial.INTERSECTS,
>                 value: evt.feature.geometry
>             });

>             var propNames = [];
This isnt used yet  I notice. If you call wfsProtocol.read without 
propertyNames specified, it will return features in GML, negating the 
point of using SLDSelect. You need to specify which attributes you want 
back.
>             //var layerNode = getLayerNode(combo.value);
>             var layerNode = tree.getSelectionModel().getSelectedNode();
>             if (layerNode !== null) {
>                 wfsProtocol = new 
> OpenLayers.Protocol.WFS.fromWMSLayer(layerNode.layer);
>                 wfsProtocol.read({
>                     filter: pfilter,
>                     callback: processSpatialQuery,
>                     scope: new OpenLayers.Strategy.BBOX()
>                 });

>                 features.removeAllFeatures();
This is implies "features" is a vector drawing layer. Since SLDSelect is 
doing the drawing, this isnt necessary
>             } else {
>                 alert("Please select a Map Layer");
>                 features.removeAllFeatures();
>             }
>         }
>     }
> })

I would get SLDSelect working first, then get the WFS fetch of 
attributes. Firebug tells you errors, but you should be checking what 
request it is sending to Geoserver and what the response looks like. 
 From memory, you are using geoserver so I think you will also need to 
convert the polygon from map coordinates to native coordinates.


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