[OpenLayers-Dev] How can i get the extent of the WMS (JS, WFS)

[Bart van den Eijnden (OSGIS)]

The way to do this unfortunately is to also perform a WFS request with the
same filter. You can use GeoJSON as the output format. Then you can use the
bbox attribute of the GeoJSON featurecollection (note: this is very new in
Geoserver and has only been added yesterday) as the extent to zoom to.

Btw, it would be a nice enhancement if you could ask Geoserver only for the
bbox of the featurecollection, since you are not interested in the actual
features itself.

Best regards,
Bart

--
Bart van den Eijnden
OSGIS, Open Source GIS
http://www.osgis.nl


--------- Oorspronkelijk bericht --------
Van: springrider <springrider at hotmail.com>
Naar: dev at openlayers.org <dev at openlayers.org>
Onderwerp: [OpenLayers-Dev]  How can i get the extent of the WMS (JS, WFS)
Datum: 14/11/07 06:54

> 
> Good morning
> 
> I am generating  some maps using Geoserver and Openlayers which contain
WMS
> layers. I can not define in advance what should be the current extent
> because these WMS layers are generated from geoserver using cql_filter to
> select some specific polygons from my shapefile.
> The goal would be to know automatically the extent of the WMS in order to
> zoom on it.
> 
> This is my current map: http://www.nabble.com/file/p13725061/OL1.jpg  and
> this is what i would like to get automatically:
> http://www.nabble.com/file/p13725061/OL2.jpg .
> 
> Is there a way to obtain by coding the current extent of the WMS (At
> geoserver or openlayers levels...)??
> I saw by using WFS service, we can get the gml:ccordinates
>
(.../wfs?request=GetFeature&amp;typename=fifao:Fao_areas&amp;cql_filter=F_AREA=27),
> can we extract this information and use it to define the extent of the
map??
> 
> Thanks for helping me, i start becoming crazy about that point.
> 
> Sylvain
> -- 
> View this message in context:
http://www.nabble.com/How-can-i-get-the-extent-of-the-WMS-%28JS%2C-WFS%29-tf4797527.html#a13725061
> Sent from the OpenLayers Dev mailing list archive at Nabble.com.
> 
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