MACROMEDIA FLEX 2-MIGRATING APPLICATIONS TO FLEX 2 Manuel d'utilisateur télécharger pdf (Page 13)

Step 1: Find and replace 13

Replace _root

Remove the use of “_root” from your application code if you used it to access the Application

instance. In Flex 1.x, you could use

_root to refer to the main application from anywhere in

your application or one of the components. This was never a recommended practice, but was

a convenient way to access the application root. To access the Application instance from

anywhere in your application, use

Application.application.

import mx.core.Application;

function myFunction():void {

//_root.ta1.text = "Thank you!"; // Flex 1.x

Application.application.ta1.text = "Thank you!"; // Flex 2

}

Also, “_global” and “_level0” no longer exist.

Alerts

The Application.alert() convenience method was removed. You must now use the

mx.controls.Alert.show() method. You import the mx.controls.Alert class and call the

Alert.show() method, as the following example shows:

import mx.controls.Alert;

public function myEventHandler(event:Event):void {

Alert.show("An event occurred!");

}

If you call the show() method in an MXML tag, then you must also include a script block

that imports the mx.controls.Alert class, as the following example shows:

<?xml version="1.0"?>

<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">

<mx:Script><![CDATA[

import mx.controls.Alert;

]]></mx:Script>

<mx:Button id="b1" label="Show Style" click="Alert.show('Alert!');"/>

</mx:Application>

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MACROMEDIA FLEX 2-MIGRATING APPLICATIONS TO FLEX 2 Manuel d'utilisateur Page 13