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I use wms layer from geoserver on my map and i use openlayers3 api. I want to zoom to my selected layer but for this i have too use extent of my selected layer.

mySelectedLayer=map.getLayers().getArray()[map.getLayers().getLength()-1];
mySelectedLayer.getExtent()// result is undefined

why?

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It seems you didn't search before asking or I misunderstand. You can already have the answer at this question.

Edit due to comment

Ok, WPS can be a bit annoying. So, another way is to call GetCapabilities if you use a WMS. You can convert the XML result to JSON and extract layer extent. See this official example illustrating the concept.

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    I saw that answer but i dont know how to use or control wps services in openlayers3
    – Mürsel Dogrusözlü
    Commented Oct 27, 2014 at 18:02

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