Select attributs of wms/wfs layers

Question

I want to select polygons in wms/wfs layers (openlayes). I used the code of this example http://openlayers.org/dev/examples/getfeature-wfs.html . Then, when I select a polygon in my the layer, nothing is selected, I don't no why. Could you help me please. Thanks

Here is the code :

WFS: GetFeature Example (GeoServer) var map, layer, select, hover, control;

    function init(){
        //OpenLayers.ProxyHost= "";
        //OpenLayers.ProxyHost= "proxy.cgi?url=";
        map = new OpenLayers.Map('map', {
            controls: [
                new OpenLayers.Control.PanZoom(),
                new OpenLayers.Control.Permalink(),
                new OpenLayers.Control.Navigation()
            ]
        });
        layer = new OpenLayers.Layer.WMS(
            "States WMS/WFS",
            "http://v2.suite.opengeo.org/geoserver/ows",
            {layers: 'usa:states', format: 'image/gif'}
        );
        select = new OpenLayers.Layer.Vector("Selection", {styleMap: 
            new OpenLayers.Style(OpenLayers.Feature.Vector.style["select"])
        });
        hover = new OpenLayers.Layer.Vector("Hover");
        map.addLayers([layer, hover, select]);

        control = new OpenLayers.Control.GetFeature({
            protocol: OpenLayers.Protocol.WFS.fromWMSLayer(layer),
            box: true,
            hover: true,
            multipleKey: "shiftKey",
            toggleKey: "ctrlKey"
        });
        control.events.register("featureselected", this, function(e) {
            select.addFeatures([e.feature]);
            alert("yes");
        });
        control.events.register("featureunselected", this, function(e) {
            select.removeFeatures([e.feature]);
        });
        control.events.register("hoverfeature", this, function(e) {
            hover.addFeatures([e.feature]);
        });
        control.events.register("outfeature", this, function(e) {
            hover.removeFeatures([e.feature]);
        });
        map.addControl(control);
        control.activate();

        map.setCenter(new OpenLayers.Bounds(-140.444336,25.115234,-44.438477,50.580078).getCenterLonLat(), 3);
    }
</script>

WFS GetFeature Example (GeoServer) WFS, GetFeature Shows how to use the GetFeature control to select features from a WMS layer.

Click or drag a box to select features, use the Shift key to add features to the selection, use the Ctrl key to toggle a feature's selected status. Note that this control also has a hover option, which is enabled in this example. This gives you a visual feedback by loading the feature underneath the mouse pointer from the WFS, but causes a lot of GetFeature requests to be issued.

Answer 1

you should set up a ProxyHost for getting information from remote server...more information is here...

OpenLayers.ProxyHost = "/cgi-bin/proxy.cgi?url=";

i hope it helps you...