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About the Flex coding process 69

Moving to Flex from an HTML templating

environment

In contrast to environments like JSP, ASP, and ColdFusion, Flex is not a templating system.

MXML files are not templates that contain rules processed on the server to return a filled-in

template. Instead, MXML code is compiled into a fully formed client application that is able

to process server-side logic, and change what is displayed using its own client-side logic.

A Flex application does not go to the server every time the user interface must change or an

event must be handled. Presentation logic and logic for server-side requests and responses is

executed on the client as part of your application’s SWF file. In Flex, changes to the user

interface occur on the client, based on client-side code execution.

A Flex application makes HTTP requests to contact external data services, such as web

services; this interaction with the server does not require you to refresh the application.

Moving to Flex from Flash Professional

Developing a Flex application is different from developing an application in Macromedia

Flash Professional 8 from Adobe, even though in both environments the application is

compiled into a SWF file. You create a Flex application in text files, which you can create and

edit in a simple text editor or a more sophisticated development environment, such as Flex

Builder. You compile your application into a SWF file, and then publish the application on a

web or application server.

You create a Flash document file (a FLA binary file) in the Flash Authoring environment, and

save it as a SWF file before publishing it to a website; it is usually referenced inside an HTML

page. Flash Professional uses concepts such as the Timeline, animation frames, and layers for

organizing and controlling an application’s content over time. In Flex, you write the

declarative parts of an application, such as user-interface components and connections to data

sources, in MXML tags. You must use the tags in the proper hierarchy within the application,

but there is no external notion of Timelines, frames, or layers. Just by using a few MXML

tags, you can create a useful application with built-in behavior.

Although the development models for Flash and Flex are different, Flash is a powerful tool for

creating custom components and visual assets that you can use in Flex applications. You can

export files created in Flash in component package files called SWC files, which you can

reference as custom tags in MXML files. You can also use the MXML

<mx:Image> and

<mx:SWFLoader> tags to import SWF files into a Flex application.

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MACROMEDIA COLDFUSION MX 7.0.2-USING COLDFUSION MX WITH FLEX 2 Guida Utente Pagina 69