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94 Using ActionScript

Using ActionScript in Flex applications

When you write a Flex application, you use MXML to lay out the user interface of your

application, and you use ActionScript to handle the user interactions with the application.

You can use a variety of methods to mix ActionScript and MXML. You can include inline

ActionScript in MXML, or supplement a codeless MXML document with an external

ActionScript controller class.

To use ActionScript in your Flex applications, you can add script blocks using the

<mx:Script> tag or include external ActionScript files. In addition, you can import external

class files or entire packages of class files for use by your MXML application. Flex extracts the

ActionScript and creates a class file, which is linked to the final SWF file. For more

information, see Flex 2 Developer’s Guide.

Using ActionScript blocks in MXML files

ActionScript blocks can contain ActionScript functions and variable declarations when used

in MXML applications.

Statements and expressions are only allowed if they are wrapped in a function. In addition,

you cannot define new classes or interfaces in

<mx:Script> blocks. All ActionScript in the

blocks is added to the enclosing file’s class when Flex compiles the application.

When using an

<mx:Script> block, you must wrap the contents in a CDATA construct. This

prevents the compiler from interpreting the contents of the script block as XML, and allows

the ActionScript to be properly generated. As a result, Adobe recommends that you write all

your

<mx:Script> open and close tags as the following example shows:

<mx:Script>

<![CDATA[

...

]]>

</mx:Script>

The script within a given <mx:Script> tag is accessible from any component in the MXML

file. The

<mx:Script> tag must be located at the top level of the MXML file (within the

Application tag or other top-level component tag). You can define multiple script blocks in

your MXML files, but you should try to keep them in one location to improve readability.

NOTE

In general, Adobe recommends that you import ActionScript class files when possible

rather than use

<mx:Script> blocks in your MXML files or include snippets of

ActionScript code from multiple files.

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MACROMEDIA COLDFUSION MX 7.0.2-USING COLDFUSION MX WITH FLEX 2 Betriebsanweisung Seite 94