[OpenLayers-Users] filtering WFS layers

[goeserver developer]

hi,

I want to use the filter option with WFS.('filter':'myfilterstring' ) . But
results are not displayed.
Can Suggest a way out.

Thanks

Christopher Schmidt-4 wrote:
> 
> On Fri, Sep 07, 2007 at 03:11:27PM +0100, David Herbert wrote:
>> I have a requirement to apply a property filter to a WFS layer of my map
>> e.g:
>> 
>> <Filter>
>> <PropertyIsEqualTo>
>> <PropertyName>species</PropertyName>
>> <Literal>chinstrap penguin</Literal>
>> </PropertyIsEqualTo>
>> </Filter>
>> 
>> for a WFS layer displaying bird colonies.  Looking at the docs at:
>> 
>> http://dev.openlayers.org/docs/files/OpenLayers/Layer/WFS-js.html 
>> 
>> leads me to believe a method called mergeNewParams is available, which
>> will modify the layer parameters and redraw it.  I am using OL 2.4
>> stable.  However, trying to use this method results in "mergeNewParams
>> is not a function" errors.  Looking at WFS.js, I see this method is not
>> there.  Should it be? If not, what's the best approach to filtering
>> layers this way? Should I remove the layer and recreate with new
>> parameters? Or is there a better way?
> 
> mergeNewParams is only in trunk. But if you're not changing the filtero
> n the fly, you don't need to use it anyway: simply add a
> 'filter':'myfilterstring' in the parameters when you construct your
> layer. The parameters are the third argument to the WFS constructor.  
> 
> If you do need to do on-the-fly filtering, then you'll need to either go
> to trunk, or you'll need to destroy the layer and re-add it with a new
> filter when it changes.  
> 
> Regards,
> -- 
> Christopher Schmidt
> MetaCarta
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> 
> 

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