MACROMEDIA COLDFUSION MX 7.0.2-USING COLDFUSION MX WITH FLEX 2 Guida Utente Scaricare il pdf (Pagina 62)

62 Building a Flex Application

Adding ActionScript to a Flex application

ActionScript follows the ECMA-262 Edition 4 (the specification written by the European

Computer Manufacturers Association) unless otherwise noted. For more information on

ActionScript, see Chapter 7, “Using ActionScript,” on page 91.

You use ActionScript for the following purposes:

Handling events The Flex user interface is event-driven. For example, when a user selects a

Button control, the Button generates an event. You handle events by defining functions in

ActionScript called event listeners. Your event listener could open a window, play a SWF file,

or perform whatever action is necessary for your application.

Handling errors You handle runtime errors in ActionScript. You can detect data validation

errors and signal the error to the user, resubmit a request to the server, or perform some other

actions based on your application.

Binding data objects to a Flex control within an MXML statement You can use data

binding to populate a data model from a Flex component, populate a component from a data

model, or copy data from one component to another.

Defining custom components You can derive custom components from the Flex

component class hierarchy to create components specific to your application requirements.

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MACROMEDIA COLDFUSION MX 7.0.2-USING COLDFUSION MX WITH FLEX 2 Guida Utente Pagina 62