[OpenLayers-Users] data extent for wms layer?

[Andreas Hocevar]

Hi,

the best way to do this is to issue a GetCapabilities request, parse the response with OpenLayers.Format.WMSCapabilities, and look for the layer's bbox or llbbox in the capabilities object. An untested snippet to show you what I mean:

var myLayerName = "my_layer";
var obj = new OpenLayers.Format.WMSCapabilities().read(response.responseText);
var capability = obj.capability;
for (var i=0, len=capability.layers.length; i<len; i++) {
    var layerObj = capability.layers[i];
    if (layerObj.name === myLayerName) {
        map.zoomToExtent(OpenLayers.Bounds.fromArray(layerObj.llbbox));
        break;
    }
}

Andreas.

On Nov 9, 2011, at 15:54 , Charles Galpin wrote:

> I'm drawing a blank on the best way to do this.  I have a wms layer (for performance)  that I'd like to zoom to the data extent for, but it looks like this is not available for a wms layer like you can for a vector layer.  
> 
> Is there a fast call I can make to get the extent only and then use this to zoom?  I am using geoserver on the server side.  Any suggestions would be appreciated.
> 
> Thanks,
> charles
> 
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-- 
Andreas Hocevar
OpenGeo - http://opengeo.org/
Expert service straight from the developers.