I have built a simple application in Flex. When the application loads, a GET request is made to the xmlService.php file with parameters "fetchData=letters". This tells the PHP to return the XML code.

In Flex Debug I can see the XML data being sent by the PHP to the flex client.

What I need it to do is populate the first drop down box (id="letter") with this data, however nothing is being received by Flex. I added an Alert.show() to check what was being returned but when the application runs, the alert is blank.

Can anyone help? Thanks in advance.

Image: http://static.readescdn.com/misc/flex.gif

// Flex
<?xml version="1.0" encoding="utf-8"?>
<s:WindowedApplication xmlns:fx="http://ns.adobe.com/mxml/2009" 
                       xmlns:s="library://ns.adobe.com/flex/spark" 
                       xmlns:mx="library://ns.adobe.com/flex/mx" width="300" height="300"
                       creationComplete="windowedapplication1_creationCompleteHandler(event)">
    <fx:Script>
        <![CDATA[
            import mx.collections.ArrayCollection;
            import mx.controls.Alert;
            import mx.events.FlexEvent;
            import mx.rpc.events.FaultEvent;
            import mx.rpc.events.ResultEvent;

            import spark.events.IndexChangeEvent;

            protected function windowedapplication1_creationCompleteHandler(event:FlexEvent):void
            {
                var params:Object    =    {'fetchData':'letters'};

                xmlService.send(params);
            }

            protected function xmlService_resultHandler(event:ResultEvent):void
            {
                var id:String    =    xmlService.lastResult.data.id.value;

                //Alert.show(xmlService.lastResult.data.id.value);

                if(id == 'letter')
                {
                    letter.dataProvider        =    xmlService.lastResult.data.letter;
                    letter.enabled            =    true;
                }
                else
                if(id == 'number')
                {
                    number.dataProvider        =    xmlService.lastResult.data.number;
                    number.enabled            =    true;
                    submit.enabled            =    true;
                }
                else
                {
                    submit.label            =    'No Data!';
                }
            }

            protected function xmlService_faultHandler(event:FaultEvent):void
            {
                Alert.show(event.fault.message);
            }

            protected function letter_changeHandler(event:IndexChangeEvent):void
            {
                var params:Object    =    {'fetchData':'numbers'};

                xmlService.send(params);
            }
        ]]>
    </fx:Script>
    <fx:Declarations>
        <s:HTTPService id="xmlService"
                       url="URL_GOES_HERE"
                       method="POST"
                       useProxy="false"
                       resultFormat="e4x"
                       result="xmlService_resultHandler(event)"
                       fault="xmlService_faultHandler(event)"/>
    </fx:Declarations>
    <s:DropDownList x="94" y="10" id="letter" enabled="false" change="letter_changeHandler(event)" labelField="value"></s:DropDownList>
    <s:DropDownList x="94" y="39" id="number" enabled="false" labelField="value"></s:DropDownList>
    <s:Button x="115" y="68" label="Submit" id="submit" enabled="false"/>
</s:WindowedApplication>

// PHP
<?
if(isset($_POST['fetchData']))
{
    if($_POST['fetchData'] == 'letters')
    {
        $xml    =    '<data>
  <id value="letters"/>
  <letter label="Letter A" value="a"/>
  <letter label="Letter B" value="b"/>
  <letter label="Letter C" value="c"/>
</data>';
    }
    else
    if($_POST['fetchData'] == 'numbers')
    {
        $xml    =    '<data>
  <id value="letters"/>
  <number label="Number 1" value="1"/>
  <number label="Number 2" value="2"/>
  <number label="Number 3" value="3"/>
</data>';
    }
    else
    {
        $xml    =    '<data>
  <result value="'.$_POST['fetchData'].'"/>
</data>';
    }

    echo $xml;
}
else
{
    echo '<data>
  <result value="NULL"/>
</data>';
}
?>