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24 Introducing Flex

Flex application characteristics

Many types of applications are appropriate for development in Flex. Some of the requirements

of these applications, and how Flex supports these requirements, include the following:

Client data collecting Collecting user input is one of the most common uses for web

applications. Flex supports forms, and all common form elements, to let you create rich and

dynamic user experiences. Flex forms include hooks to the Flex data modeling and data

validation mechanism, and the ability to identify required input fields. For more information,

see Chapter 15, “Using Layout Containers,” in the Flex 2 Developer’s Guide.

Configuration One of the most common applications using Flex lets users perform product

selection and configuration. The user works through a process to configure the features of a

product, views or inspects the configuration, and then proceed through the steps required to

complete a purchase.

Client-side processing of user input, including filtering and data validation Flex data

management, which includes data models, data validators, data binding, and data services, lets

you separate data representation from the way that a user views it. Typically, this design

pattern is called Model-View-Controller (MVC). Flex also provides a powerful way to validate

data and pass data between user-interface controls and external data sources with little or no

server interaction. For more information, see Chapter 37, “Representing Data,” in the Flex 2

Developer’s Guide.

Direct user feedback Complex tasks must provide feedback to users when the user makes

input errors or enters invalid information. Flex formatters and validators help ensure the

quality of input data.

Multistep processes Many applications present the user with a process that includes a

sequence of steps or decisions that require user input. For example, completing a registration

form or checkout form often requires multiple steps to complete.

Ideally, you want your users to be able to navigate through multiple steps on a single page

without losing the context of where they are in the process, and without losing any of the

previous information that they have already entered. Flex supports the development of these

applications by capturing state information, supporting browser Back and Forward buttons

by using the History Manager. For more information, see Chapter 16, “Using Navigator

Containers” and Chapter 32, “Using the History Manager,” in the Flex 2 Developer’s Guide.

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MACROMEDIA COLDFUSION MX 7.0.2-USING COLDFUSION MX WITH FLEX 2 Guia do Utilizador Página 24