[OpenLayers-Users] Defining WFS-filter dynamically

[Kai Behncke]

Dear users,

> 
> I try to set a WFS-filter dynamically.

I found a solution now.

If I get e.g a list of comma-separated objekt_ids (4,20,56,.....) that shall be filtered in the wfs


I do:

 suchobjekte = new String(suchobjekte);
 y=suchobjekte.split(",");



  var filter_body;
  var filter_header = '<'+'?xml version="1.0" encoding="ISO-8859-1"?><wfs:GetFeature xmlns:ogc="http://www.opengis.net/ogc"xmlns:gml="http://www.opengis.net/gml"xmlns:wfs="http://www.opengis.net/wfs" service="WFS" version="1.0.0"maxFeatures="5" outputFormat="GML2"><wfs:Query srsName="epsg:4326" typeName="gastronomie_ows">';
            
         
 var filter_footer = '</wfs:Query></wfs:GetFeature>';

 var filter_1_1 = new OpenLayers.Format.Filter({version: "1.1.0"});
            var xml = new OpenLayers.Format.XML();
            var wfs_url = "http://www.xyz.de/cgi-bin/mapserv?map=/............./ows.map";

 




 if(y.length > 1) {
        
               
               
          filter_body_1='<ogc:Filter xmlns:ogc="http://www.opengis.net/ogc"><ogc:Or>';
          filter_body_2="";
          filter_body_3='</ogc:Or></ogc:Filter>';
        
          for(var i=0;i< y.length;i++){   
             alert (y[i]);                                                                                                                       
            filter_body_2= filter_body_2 +'<ogc:PropertyIsEqualTo matchCase="true"><ogc:PropertyName>objekt_id</ogc:PropertyName><ogc:Literal>'+y[i]+'</ogc:Literal></ogc:PropertyIsEqualTo>';
          }       
               
    filter_body=filter_body_1 + filter_body_2 + filter_body_3;            
               
            } else {
               

                
              var filter_body = new OpenLayers.Filter.Comparison({
                    type: OpenLayers.Filter.Comparison.EQUAL_TO,
                    property: "objekt_id",
                    value: y[0]
                    });
   
              filter_body = xml.write(filter_1_1.write(filter_body));     
                
                
                
                
            }  
 
         
          
            var final_filter = filter_header+filter_body+filter_footer;

  req = new OpenLayers.Request.POST({
                method: "POST",
                url: wfs_url,
                data: final_filter,
                callback: do_what_i_want
            });



....with that it works.



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