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96 Using ActionScript

Referring to Flex components in ActionScript

When you refer to Flex components in ActionScript, the component must have an id

property set. You then use the

id to refer to that component.

For example, you can define a TextArea control in MXML using the

<mx:TextArea> tag. To

access that component’s methods or properties, use dot syntax. The following example sets the

value of the

text property of the TextArea named ta1:

<?xml version="1.0" encoding="utf-8"?>

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

creationComplete="setTextValue()">

<mx:Script>

<![CDATA[

public function setTextValue():void {

ta1.text = "Congratulations. You are a winner.";

}

]]>

</mx:Script>

<mx:TextArea id="ta1"/>

</mx:Application>

You can refer to the current enclosing document or current object using the this keyword.

For more information, see Chapter 4, “Using ActionScript,” in Flex 2 Developer’s Guide.

Including ActionScript code versus importing

ActionScript classes

To make your MXML code more readable, you can also reference ActionScript files in your

<mx:Script> tags, rather than insert large blocks of script. You can include or import

ActionScript files.

There is a distinct difference between including and importing in ActionScript. Including is

copying lines of code from one file into another. Importing is adding a reference to a class file

or package so that you can access objects and properties defined by external classes. Files that

you import must be found in the ActionScript classpath. Files that you include must be

located relative to the application root or use an absolute path.

You use the

include directive or the <mx:Script source="filename"> tag to add

ActionScript code snippets to your Flex applications.

You use

import statements in an <mx:Script> block to add ActionScript classes and packages

to your Flex applications.

For more information, see Chapter 4, “Using ActionScript,” in Flex 2 Developer’s Guide.

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MACROMEDIA COLDFUSION MX 7.0.2-USING COLDFUSION MX WITH FLEX 2 Guide de l'utilisateur Page 96