[OpenLayers-Users] Creating an ogc:Filter combining ogc:BBOX and others

[Roald de Wit]

Just created a ticket for this:
http://trac.openlayers.org/ticket/2061

Roald de Wit wrote:
> Hi David,
>
> As you figured and Chris advised, use the new WFS protocol (available in 
> 2.8-rc1 onwards).
> Have a look here how to have OL create the filter for you [1].
>
> A 'hidden' feature of the new WFS Protocol, or better: the BBOX strategy 
> is to combine the BBOX with your own filter!
> Here is an example of how to do it:
>
>     var propertyFilter = new OpenLayers.Filter.Comparison({
>         type: OpenLayers.Filter.Comparison.EQUAL_TO,
>         property: 'STATE_NAME',
>         value: 'New York'
>     });
>
>     var layer = new OpenLayers.Layer.Vector("WFS", {
>         strategies: [new OpenLayers.Strategy.BBOX()],
>         filter: propertyFilter, // undocumented!
>         protocol: new OpenLayers.Protocol.WFS({
>             url:  "http://publicus.opengeo.org/geoserver/wfs",
>             featureType: "states",
>             featureNS: "http://www.openplans.org/topp"
>         }),
>     });
>
> This is an undocument feature that probably deserves some more attention 
> since your use case is far from unique.
>
> [1] http://www.openlayers.org/dev/examples/filter.html
>
> dalsinao wrote:
>   
>> Hello,
>>
>> I have seen that there are some changes in the WFS protocol coming in the
>> next release.
>> One that particularly affects me is that now the BBOX parameter is not
>> always added in the WFS requests as before. That's fine, but now I have a
>> related question.
>>
>> If you have your own ogc:filter and you want to combine it with BBOX, how
>> can you do it?
>> I would like to combine my ogc:filter (static) with the dynamically
>> generated ogc:BBOX filter (changing according to the viewport I understand). 
>>
>> Is it possible to do so? and if so, how? 
>>
>> I have seen the example in wfs-protocol.html, using "strategies" and
>> "protocol", which at the end produces an HTTP/POST request having an
>> ogc:filter like the one (for WFS 1.1.0):
>>
>> <ogc:Filter xmlns:ogc="http://www.opengis.net/ogc">
>>     <ogc:BBOX>
>>         <ogc:PropertyName>the_geom</ogc:PropertyName>
>>         <gml:Envelope xmlns:gml="http://www.opengis.net/gml"
>> srsName="EPSG:4326">
>>             <gml:lowerCorner>-37.4060546875 15.1189453125</gml:lowerCorner>
>>             <gml:upperCorner>-14.9939453125 26.2810546875</gml:upperCorner>
>>         </gml:Envelope>
>>     </ogc:BBOX>
>> </ogc:Filter>
>>
>> What I would like to do is to combine this ogc:filter with mine to get e.g
>> something like this:
>>
>> <ogc:Filter xmlns:ogc="http://www.opengis.net/ogc">
>>     <ogc:And>
>>         <ogc:BBOX>
>>             <ogc:PropertyName>the_geom</ogc:PropertyName>
>>             <gml:Envelope xmlns:gml="http://www.opengis.net/gml"
>> srsName="EPSG:4326">
>>                 <gml:lowerCorner>-37.4060546875
>> 15.1189453125</gml:lowerCorner>
>>                 <gml:upperCorner>-14.9939453125
>> 26.2810546875</gml:upperCorner>
>>             </gml:Envelope>
>>         </ogc:BBOX>
>>         <ogc:PropertyIsEqualTo>
>>             <ogc:PropertyName>Scenario</ogc:PropertyName>
>>             <ogc:Literal>Demo</
>>             ogc:Literal>
>>         </ogc:PropertyIsEqualTo>
>>     </ogc:And>
>> </ogc:Filter>
>>
>>
>> And parallel to this. Is it the intention in the long term to get rid of the
>> OpenLayers.Layer.WFS layer and use only the OpenLayers.Layer.Vector?
>>
>> Any info you may have or reference on where to look at will be appreciated.
>>
>> Thanks in advance and regards.
>> David
>>   
>>     
>
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