[OpenLayers-Users] how select the right feature between 2 superimposed ?

[Indika Tantrigoda]

Hi,

After looking at
http://gis.ibbeck.de/ginfo/apps/OLExamples/OL26/examples/styles_unique_with_group_wfs.htmlI
managed to find a
work around . I have two wfs point layers, and can activate the
selectFeature for the currently selected layer via a radio button.

Some of my features were superimposed on top of other layers. However when
the needed layer is selected via the radio buttons the selected layer is
superimposed.

Heres my code

//inside init()

var myHTML = "<input type=radio name=myRadio
onclick=test(2)><label>Cities</label> <img src='./img/marker-blue.png'>
<br>" myHTML += "<input type=radio name=myRadio
onclick=test(3)><label>Stations</label> <img src='./img/marker-gold.png'>"

            document.getElementById("controls").innerHTML = myHTML;
//

//outside init()

     var myLayer;  //global variable
     var myObj;     //global variable

     function test(id) {

            myLayer =id;

            if(selectControl)
             {
                    //alert("Hiiiiiiiiiiiii");
                    selectControl.destroy();
             }

             selectControl = new
OpenLayers.Control.SelectFeature(map.layers[id],

{

onSelect : onFeatureSelect,

onUnselect: onFeatureUnselect

});

            map.addControl(selectControl);
            selectControl.activate();

            //I didnt think this it necessary to unregister because the
control is destroyed above
            //map.layers[id].events.unregister('featureselected',
map.layers[id], regFeatureSelected);
            //map.layers[id].events.unregister('featureunselected',
map.layers[id], regFeatureUnselected);
   }

           function onFeatureSelect()
           {
               var currentLayer = map.layers[myLayer];
               var obj = currentLayer.selectedFeatures[0];
               myObj = obj
               //alert(obj.attributes['name']);

               popup = new OpenLayers.Popup.FramedCloud("chicken",

obj.geometry.getBounds().getCenterLonLat(),
                                     null,
                                     "<div style='font-size:.8em'>" +
obj.attributes['name'] +"<br />" + "</div>",
                                     null, true, onPopupClose);
               obj.popup = popup;
               map.addPopup(popup);
            }

           function onPopupClose(evt) {
                     selectControl.unselect(myObj);
           }

           function onFeatureUnselect()
           {
               //alert("from regFeatureUnselected");

              map.removePopup(myObj.popup);
              myObj.popup.destroy();
              myObj.popup = null;
           }


Hope this was helpful.

Indika


2008/11/26 Eric Lemoine <eric.c2c at gmail.com>

> On Wed, Nov 26, 2008 at 10:20 AM, Sébastien Geindre
> <sebastien.geindre at meteo.fr> wrote:
> > Eric Lemoine a écrit :
> >>
> >> Seb, I don't understand your question. If you're trying to get the
> >> select feature control to work with multiple layers then you must know
> >> that that isn't currently supported by OpenLayers. Sorry for not
> >> understanding your question. Eric
> >
> > you guessed it !
> >
> > is there any workaround ?
> >
> > all features must be on the same layer ?
>
> Yes.
>
> --
> Eric
> _______________________________________________
> Users mailing list
> Users at openlayers.org
> http://openlayers.org/mailman/listinfo/users
>
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