QueryTask Called Multiple Times in a Row - Only Returns on Result

chuckfrank — Wed, 09 Jan 2013 13:05:05 GMT

Hi All,

In an effort to write reusable code, I wrote the function below that will query a feature layer (url paramater) by a polygon (poly parameter). This way I don't need to have a separate query and actionscript block for each feature layer that I'll query. The problem that will happen is that when the function is called multiple times in a row the second query will begin before the first one has completed because it's asynchronous. At that point I'm not sure how to know which result is which. I really want to avoid having to write a black of code for each specific query, but when I try to generalize it, like the example below, I'm running into the asynchonous issues. Does any body have any ideas to handle this or a code example of a better way? Is there a way I can understand which result is which?

Thanks,
Chuck

  private function FilterAttributeTablesByPolygon(poly:Polygon, strURL:String):void
  {
   querytaskFeaturesByPolygon.url = strURL;
   
   queryFeaturesByPolygon.geometry = poly;
   
   querytaskFeaturesByPolygon.execute(queryFeaturesByPolygon);
  }

                protected function querytaskFeaturesByPolygon_executeCompleteHandler(event:QueryEvent):void
   {
    
    // highlight the selected features - NOT DONE
    var fs:FeatureSet = event.featureSet;
    
    var attributes:Array = fs.attributes;
    var al:ArrayList = new ArrayList();
    
    for each (var objRec in attributes)
    {
     al.addItem(objRec);
    }

                      //code continues....

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QueryTask Called Multiple Times in a Row - Only Returns on Result