Fernando Correia’s Weblog

July 17, 2008

Flex client talking to GAE

Filed under: Software Development — Fernando Correia @ 10:29 pm
Tags: ,

In a new iteration of my Flex and Python Test project, I created a crude Flex client. It is able to talk to the GAE server using AMF and perform two operations: retrieve all projects, and insert a new project. Both the client and the server see the data as objects.

This is what the user interface looks like:

And this is the Flex source code:

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" creationComplete="onInit()">
        import flash.net.Responder;
        import mx.controls.Alert;

        public var dataProvider:Array;

        public var statusMsg:String;

        public var gateway:NetConnection;

        public function onInit():void
            statusMsg = "Loading data...";
               gateway = new NetConnection();

        public function getProjects():void {
            gateway.call("ProjectService.get_all", new Responder(getResult, onFault));

        public function getResult(result:Array):void {
            dataProvider = result;
            statusMsg = "Data loaded.";

        public function submitProject():void {
            var newProject:Object = new Object();
            newProject.code = project_code.text;
            newProject.name = project_name.text;
            gateway.call("ProjectService.insert", new Responder(null, onFault), newProject);

        public function onFault(info:Object):void {
            statusMsg = info.toString();

    <mx:DataGrid id="dgProjects" x="10" y="10" dataProvider="{dataProvider}"
        width="356" height="183">
            <mx:DataGridColumn headerText="Code" dataField="code"/>
            <mx:DataGridColumn headerText="Name" dataField="name"/>
    <mx:Button x="374" y="11" label="Reload" click="onInit()"/>
    <mx:Label x="10" y="203" text="Created at"/>

    <mx:TextInput x="103" y="201" id="selected_created_at"
        text="{dgProjects.selectedItem.created_at}" width="263"/>
    <mx:Form x="10" y="240" width="356" borderStyle="solid" cornerRadius="2">
      <mx:FormHeading label="New Project"/>
         <mx:Label text="Code"/>
         <mx:TextInput id="project_code" width="159"/>
         <mx:Label text="Name"/>
         <mx:TextInput id="project_name"/>
      <mx:Button label="Insert" click="submitProject()"/>
    <mx:Label x="10" y="384" text="{statusMsg}" width="356"/>

The project is hosted in github. Feedback is welcome.


1 Comment »

  1. […] under: Software Development — fernandoacorreia @ 9:23 am Tags: flex While I was building my Flex client to a Google App Engine application, I was not able to make the Flex 3 debugger […]

    Pingback by Debugging Flex apps with Firefox « Fernando Correia’s Weblog — July 18, 2008 @ 9:23 am

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