Identify on WMS Layer

Anonymous User

Are there any snippets out there for this? Samples, etc.?

Thanks in advance....

rGibson

PaulHastings1

in the interests of a quick reply, this is for WFS identify all from a project i have on disk that is based on google maps & geoserver. you'll have to change the map mouse event to ESRI's & build your own display as well as the cleanup routine to remove the event handlers.

when i get a chance i'll dig up a proper WMS getFeatures example.

// this snippet is set in the app init
// where: 
//  wfsURL==String var
//  campusMapParams.geoserver == your WFS server
//  qLayers==Array holding layer names you want to query
//  srs==spatial reference that applies to the WFS server you want to query, for geoserver its EPSG references
wfsURL=campusMapParams.geoserver+"wfs?request=GetFeature&version=1.1.0&typeName="+qLayers.toString()+"&srs="+srs;



protected function doIdentifyAll(event:MapMouseEvent): void {
 var getWFS:HTTPService=new HTTPService;       
 // we'll use a DWITHIN filter to grab any features that are within 25 meters or so
 // NOTE DWITHIN units MUST match the point coords, ie degrees!!
 var idPoint:String=String(event.latLng.lng())+","+String(event.latLng.lat());    
 // google's coords are all geographic so we'll stick w/EPSG:4326
 getWFS.url=wfsURL+'&FILTER=<Filter xmlns="http://www.opengis.net/ogc" xmlns:gml="http://www.opengis.net/gml">' + 
  '<DWithin><PropertyName>the_geom</PropertyName>' + 
  '<gml:Point srsName="EPSG:4326"><gml:coordinates>'
  +idPoint
  +'</gml:coordinates></gml:Point><Distance units="deg">0.000050</Distance></DWithin></Filter>';
 getWFS.method="GET";
 getWFS.resultFormat="e4x";
 getWFS.addEventListener("result", identifyAllFeaturesHandler);
 getWFS.addEventListener("fault", httpServiceFault);
 getWFS.useProxy=false;
 try {
  getWFS.send();
 }   
 catch (error:Error) {
  informUser("Fatal error: Unable to perform identify features on geoserver " + error,"WFS identify all","error");
 }
}

protected function identifyAllFeaturesHandler(event:ResultEvent):void {
 var results:XML=event.result as XML;
 var features:XMLList=results.gml::featureMembers.children();
 var gid:String="";
 var featureAttributes:ArrayCollection=new ArrayCollection();
 for (var i:int = 0; i < features.length(); i++) {
  gid=features.@gml::id;
  var thisFeature:Object=parseAttributes(features);
  for (var x:String in thisFeature) {
   featureAttributes.addItem({layer:gid,attribute:x,value:thisFeature});
  }
 }
 if (featureAttributes.length==0)
  informUser("No features found at that point","Identify");
 else {
  if (idResultWindow) // get rid of last one no matter what
   PopUpManager.removePopUp(idResultWindow);
  // clean slate 
  idResultWindow=IdentifyResultWindow(PopUpManager.createPopUp(this,IdentifyResultWindow,false));
  idResultWindow.dataSource=featureAttributes;
 }     
}

protected function parseAttributes(xmlNode:XML):Object {
 var nodes:XMLList = xmlNode.children();
 var attributes:Object = {};
 for(var i:int = 0; i < nodes.length(); i++) {
  var name:String = nodes.localName();
  var value:Object = nodes.valueOf();
          if(name == null || name=="the_geom")
               continue;
  // Check for a leaf node
          if((nodes.children().length() == 1)
              && !(nodes.children().children()[0] is XML))
              attributes[name] = value.children()[0].toXMLString();              
    extend(attributes, this.parseAttributes(nodes));    
 }
     return attributes;
}