[OpenLayers-Users] SelectFeature usage in OpenLayers 2.7

[Christopher Schmidt]

On Fri, Jan 30, 2009 at 06:40:56PM +0530, Subha Ramakrishnan wrote:
> Hi
> 
> I am using Openlayers with mapserver and recently upgraded to Openlayers 
> 2.7.
>  From the documentation and the mail archive, I found that there is a 
> change with this control from 2.6 to 2.7.
> 
> I've a vector layer with multiple points on it. And for every point i 
> add a selectFeature to show a pop up on clicking it.
> The problem here is the z-index of the layer. The moment i add the first 
> selectFeature to the layer, the z-index goes up to "725" from some value 
> in 300 range. Then with every control's activate call 
> [selectControl.activate()], the z-index of the layer increases by 1 and 
> it goes beyond 750, resulting in problems with displaying pop up.
> 
> This is my code:
> 
> var point = new 
> OpenLayers.Geometry.Point(parseFloat(loc1),parseFloat(loc2));
> var pointFeature = new OpenLayers.Feature.Vector(point);
> vectorLayer.addFeatures([pointFeature]);
> selectControl = new OpenLayers.Control.SelectFeature(vectorLayer,
> {onSelect: onPointSelect, onUnselect: onPointUnselect,toggle : true});
> map.addControl(selectControl);
> selectControl.activate();
> 
> Am i doing something wrong here?
> Is there any other way to show a pop up on clicking the point?

There is no need to register a selectFeature control per point. Instead,
register a single selectFeature control for the layer.

This is demonstrated in:
 
  http://openlayers.org/dev/examples/select-feature-openpopup.html
  http://openlayers.org/dev/examples/sundials-spherical-mercator.html

It is also documented as pat of a tutorial in: 

  http://docs.openlayers.org/library/overlays#displaying-popups

Regards,
-- 
Christopher Schmidt
MetaCarta