Clicking on a polygon-opening a page/link

Question

I have a many polygons on my map serving through WMS from geoserver. I want to implement the task such that when the user clicks on a particular polygon , he should be directed to a html page about that polygon. Like if I click on my CSE Dept I should be directed to my cse dept home page.

Need help in achieving this...

I have followed http://lyceum.massgis.state.ma.us/wiki/doku.php?id=generate_imagemap as but when I try "http://localhost:8080/geoserver/wms?service=WMS&version=1.1.0&request=GetMap&layers=IITKanpur:halls&styles=iitk_halllinks&bbox=80.226,26.504,80.235,26.512&width=512&height=455&srs=EPSG:4326&format=text/html" I am not getting anything.

My iitk_halllinks sld is :

<Rule> <Name>href</Name> <PointSymbolizer><Graphic><Size>16</Size></Graphic></PointSymbolizer> <TextSymbolizer><Label><PropertyName>halls_link</PropertyName></Label></TextSymbolizer> </Rule>

Answer 1

Use this example: http://openlayers.org/dev/examples/getfeatureinfo-popup.html

But instead of doing this:

    eventListeners: {
        getfeatureinfo: function(event) {
            map.addPopup(new OpenLayers.Popup.FramedCloud(
                "chicken", 
                map.getLonLatFromPixel(event.xy),
                null,
                event.text,
                null,
                true
            ));
        }
    }

replace the above for something like this:

eventListeners: {
    getfeatureinfo: function(event) {
        window.open("http://mydomain.com/polygoninfo.php?polygonid=" + event.feature.attributes.id, "window_name","location=1,status=1,scrollbars=1,resizable=no,width=650,height=650");
    }
}

Answer 2

You can install the imagemap extension and follow the the example http://docs.geoserver.org/latest/en/user/extensions/imagemap.html which allows you to request the map using text/html. This will provide the ability to click on a polygon