Help! How do I dispatch an event from one class to another?

Hi!

I want to dispatch an event from the MODEL(Stations) to the VIEW, when the Stations.onResult() function has been executed.

How do I do this??

This is the MODEL:

Code:

---

package classes.model {
    import mx.rpc.events.ResultEvent;
    import mx.rpc.http.HTTPService;
    import XMLList;
    import mx.collections.XMLListCollection;
    import flash.system.Security;
   
    public class Stations {
       
        private var _httpService:HTTPService = new HTTPService();
        private var _xmlData:XMLList = new XMLList();
        [Bindable]
        private var _xmlDataCollection:XMLListCollection;
       
       
        public function Stations():void {
            _httpService.url = "http://localhost/te.php";
            _httpService.useProxy = false;
            _httpService.method = "POST";
            _httpService.resultFormat = "e4x";
            _httpService.addEventListener(ResultEvent.RESULT, onResult)
            _httpService.send();

        }
       
        public function onResult(event:ResultEvent):void {
            _xmlData = event.result.fields.field;
            _xmlDataCollection = new XMLListCollection(_xmlData);
        }
       
        public function getTheData():XMLListCollection {
            return _xmlDataCollection;
        }
    }
}

---

This is the VIEW:

Code:

---

<?xml version="1.0" encoding="utf-8"?>
<mx:Panel xmlns:mx="http://www.adobe.com/2006/mxml" initialize="init()">

    <mx:Script>
        <![CDATA[
            import classes.model.Stations;
            import mx.collections.XMLListCollection;

            [Bindable]
            private var stationData:Stations = new Stations();
           
            private function init():void {
                trace (stationData.getTheData());
            }
        ]]>
    </mx:Script>
    <mx:VBox>
        <mx:DataGrid id="stationGrid" dataProvider="{stationData.getTheData()}" />
    </mx:VBox>
</mx:Panel>

---

Please help!

PHP Code:

---

public function onResult(event:ResultEvent):void {
    _xmlData = event.result.fields.field;
    _xmlDataCollection = new XMLListCollection(_xmlData);
    dispatchEvent(new Event('onModelResult'));
}


// ...

private function init():void {
    stationData.addEventListener('onModelResult', someFunction);
    trace (stationData.getTheData());
} 


---

Quote:

---

Originally Posted by neznein9

PHP Code:

---

public function onResult(event:ResultEvent):void {
    _xmlData = event.result.fields.field;
    _xmlDataCollection = new XMLListCollection(_xmlData);
    dispatchEvent(new Event('onModelResult'));
}


// ...

private function init():void {
    stationData.addEventListener('onModelResult', someFunction);
    trace (stationData.getTheData());
} 


---

---

Thanks! But it does not work for me though..

What I need here is the _xmlDataCollection to be filled with the data from the HTTPService, and THEN be passed to the VIEW. I thought that if I'd dispatch an event from the onResult() function, that the the _xmlDataCollecition would be filled with the data...but I was wrong..instead it gives me an
" Cannot access a property or method of a null object reference" error...:mad: :confused:

Could someone just give me a code sample on HOW TO DISPATCH AN XMLLISTCOLLECTION FILLED WITH DATA FROM A HTTPSERVIDE TO ANOTHER CLASS??

In that case you'll need to make a custom event class that holds a variable:

PHP Code:

---

package classes.model {

     //--------------------------------------
    // PACKAGES
    //--------------------------------------

        import flash.events.Event;
        import mx.collections.XMLListCollection;

    public final class ResultEvent extends Event {

        //--------------------------------------
        //  CONSTRUCTOR
        //--------------------------------------

            public function ResultEvent(s:String, xx:XMLListCollection){
                this.xmlData = xx;
                super(s);
            }

        //--------------------------------------
        //  PUBLIC VARIABLES
        //--------------------------------------
        
            public var xmlData:XMLListCollection;
    }
} 


---

And plug that into the existing setup:

PHP Code:

---

public function onResult(event:ResultEvent):void { 
    _xmlData = event.result.fields.field; 
    _xmlDataCollection = new XMLListCollection(_xmlData); 
    dispatchEvent(new ResultEvent('onModelResult', _xmlDataCollection));
} 


// ... 

private function init():void { 
    stationData.addEventListener('onModelResult', function(evt:ResultEvent):void{
        trace('Result Received: ' + evt.xmlData);
    });

    trace (stationData.getTheData()); 
} 


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