[OpenLayers-Users] filtering WFS layers

[David Herbert]

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?

Thanks for any help,

David Herbert
British Antarctic Survey.

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