[OpenLayers-Users] Using Filter parameter in WFS request.

[Eric Lemoine]

Hi. Layer.WFS already sets a bbox param in the GetFeature request, and
bbox is incompatible with filter. I'm not familiar enough with
GeoServer to be sure, but it may be that the bbox param takes
precedence over the filter one. With MapServer 4 filter takes
precedence over bbox, while MapServer 5 returns an error. Hope this
helps. Eric

2008/8/25, lorkyo <lorkyo at 163.com>:
>  Hi,
>  I have come accross the layer when I use add  Filter parameters to request
> features. part of my codes are below and the features are not shown in the
> map:
> ***********code**********
>     layer = new OpenLayers.Layer.WFS(
>         "Analyze (WFS)",
>         "http://192.168.6.140:8080/geoserver/wfs",
>         {
>          request: 'GetFeature',
>          typeName:'topp:analyze',
>
> FILTER:'%3Cogc:Filter%20xmlns:ogc=%22http://www.opengis.net/ogc%22%3E%3Cogc:PropertyIsGreaterThan%3E%3Cogc:PropertyName%3EId%3C/ogc:PropertyName%3E%3Cogc:Literal%3E0%3C/ogc:Literal%3E%3C/ogc:PropertyIsGreaterThan%3E%3C/ogc:Filter%3E'
>     },
>      {maxExtent: bounds, maxResolution: 3.986275569928255E-5, projection:
> "EPSG:4326", buffer: 0},
>      { featureClass: OpenLayers.Feature.WFS}
>                    );
>          map.addLayer(layer);
> ***********code**********
> The feature is not shown on the map. However, after remove the parameter
> Filter like below, the wfs layer then appear on the map:
> ***********code**********
>   layer = new OpenLayers.Layer.WFS(
>         "Analyze (WFS)",
>         "http://192.168.6.140:8080/geoserver/wfs",
>         {
>          request: 'GetFeature',
>          typeName:'topp:analyze'},
>      {maxExtent: bounds, maxResolution: 3.986275569928255E-5, projection:
> "EPSG:4326", buffer: 0},
>      { featureClass: OpenLayers.Feature.WFS});
>          map.addLayer(layer);
>    **********code****************
>     And I'm sure with the value filter because I can get the result through
> browser with following url which is copied from the former js code:
>
> http://192.168.6.140:8080/geoserver/wfs?request=GetFeature&typeName=topp:analyze&FILTER=%3Cogc:Filter%20xmlns:ogc=%22http://www.opengis.net/ogc%22%3E%3Cogc:PropertyIsGreaterThan%3E%3Cogc:PropertyName%3EId%3C/ogc:PropertyName%3E%3Cogc:Literal%3E0%3C/ogc:Literal%3E%3C/ogc:PropertyIsGreaterThan%3E%3C/ogc:Filter%3E
> the result appear on my browser after I typed this url is:
> *******************
> <?xml version="1.0" encoding="UTF-8" ?>
> - <wfs:FeatureCollection xmlns="http://www.opengis.net/wfs"
> xmlns:wfs="http://www.opengis.net/wfs"
> xmlns:topp="http://www.openplans.org/topp"
> xmlns:gml="http://www.opengis.net/gml"
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
> xsi:schemaLocation="http://www.openplans.org/topphttp://192.168.6.140:8080/geoserver/wfs/DescribeFeatureType?typeName=topp:analyzehttp://www.opengis.net/wfshttp://192.168.6.140:8080/geoserver/schemas/wfs/1.0.0/WFS-basic.xsd">
> - <gml:boundedBy>
> - <gml:Box srsName="http://www.opengis.net/gml/srs/epsg.xml#4326">
>   <gml:coordinates xmlns:gml="http://www.opengis.net/gml" decimal="." cs=","
> ts="">97.51721382,0.00470831 97.52223518,0.00781349</gml:coordinates>
>   </gml:Box>
>   </gml:boundedBy>
> - <gml:featureMember>
> - <topp:analyze fid="analyze.1">
> - <topp:the_geom>
> - <gml:MultiLineString
> srsName="http://www.opengis.net/gml/srs/epsg.xml#4326">
> - <gml:lineStringMember>
> - <gml:LineString>
>   <gml:coordinates xmlns:gml="http://www.opengis.net/gml" decimal="." cs=","
> ts="">97.51721382,0.00540555 97.51963792,0.00542299</gml:coordinates>
>   </gml:LineString>
>   </gml:lineStringMember>
>   </gml:MultiLineString>
>   </topp:the_geom>
>   <topp:Id>1</topp:Id>
>   </topp:analyze>
>   </gml:featureMember>
>  </wfs:FeatureCollection>
>       So have anyone encountered this problem or can help me find out why?
>
>  Best regards!
>
>