Introduction to Flex - About ActionScript 2.0 in MXML applications

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ActionScript extends the capabilities of Flex application developers. With ActionScript, you can define event listeners and handlers, get or set component properties, handle call-back functions, and create new classes, packages, and components.

You can use ActionScript in your Flex applications in the following ways:

• Insert ActionScript code blocks with the <mx:Script> tag. In these code blocks, you can add new functions, handle errors and events, and perform other tasks in your application or its supporting MXML files.
  
  
• Call global ActionScript functions that are stored in the system_classes directory structure.
  
  
• Reference external classes and packages in user_classes to handle more complex tasks. This lets you take advantage of ActionScript support for object-oriented programming concepts such as code reuse and inheritance.
  
  
• Use standard Flex components. The logic of components and helper classes in the Flex application model is based on ActionScript classes.
  
  
• Extend existing components with ActionScript classes.
  
  
• Create new components in ActionScript.
  
  
• Create new components in the Flash authoring environment (SWC files).

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