[OpenLayers-Users] Zoom to a Layer's Extent

[Bill Thoen]

All I know is that I have some vectors in a layer somewhere on the map, 
but I don't know where their center is or how far out I need to zoom to 
them all at the maximum zoom scale.  I need a bounding box for an entire 
layer, if that's possible because these layers are not the same (these 
are pipeline networks for different companies).

Eric Lemoine wrote:
> Hi. Why don't you use map.setCenter to zoom to a specific zoom level? Eric
>
> 2008/9/3, Bill Thoen <bthoen at gisnet.com>:
>   
>> I want to zoom a map to the extent of a layer (called baseLayer) but
>> when I try:
>> map.zoomToExtent(baseLayer.getDataExtent());
>> the baseLayer.getDataExtent() function returns null. When I don't
>> include this line everything works fine (the layer appears normally,
>> only without the zoom that I want.) What am I missing here?
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>
>