topic Re: Getting a value from AsyncResponder in ArcGIS API for Flex Questions

Getting a value from AsyncResponder

ShannakaBeveridge — Thu, 14 Apr 2011 01:38:49 GMT

Hi,

I'm having an issue with the code below. The issue is that "return name;" is running before "onResult", so it returns null even though the onResult function is getting the correct name. Is there anyway to get it to wait until onResult or onFault are complete?

private function getRel(geometry:Geometry,lyr:String):String
   {
    var name:String;
    
    var query:Query = new Query();
    query.geometry = geometry;

    var featureLayer:FeatureLayer = map.getLayer(lyr) as FeatureLayer;
    featureLayer.queryFeatures(query, new AsyncResponder(onResult, onFault));
    
    function onResult(featureSet:FeatureSet, token:Object = null):void
    {
     if (featureSet.features.length > 0)
     {
      for each (var myGraphic:Graphic in featureSet.features)
      {
       if (myGraphic.attributes["NAME"])
       {
        name = name + myGraphic.attributes["NAME"];
        Alert.show("name =" + name);        
       }
      }      
     }
     else
     {
      //Alert.show("No " + lyr + " found. Please enter " + lyr + " name.");
     }    
    }
    
    function onFault(info:Object, token:Object = null):void
    {
     //Alert.show(info.faultString + "\n\n" + info.faultDetail, "queryTask fault " + info.faultCode);
    }
    
    return name;
   }

Cheers,

Shannaka

Re: Getting a value from AsyncResponder

ReneRubalcava — Thu, 14 Apr 2011 02:53:02 GMT

In a situation like that, you'd probably want to wrap that whole function into it's own class that extends EventDispatcher, then have the function dispatch the result "name". You could make a custom event or use a DynamicEvent to save some time.

Re: Getting a value from AsyncResponder

eddiequinlan — Thu, 23 Feb 2012 12:46:36 GMT

I'm sorry if my question gets posted twice, but I don't see my first post on the thread.

I'm having a very similar problem, but I don't understand how to implement the eventdispatcher method. Could you post a sample of your code either extending the EventDispatcher or the other way of a custom dynamic event. I'm confused on this.

Sincerely,
Eddie