Book Image

Flex 3 with Java

Book Image

Flex 3 with Java

Overview of this book

Flex 3 is a great technology for developing Rich Internet Applications for the Web as well as for the desktop. If you are a developer looking to design great-looking and sophisticated user interfaces that resemble desktop-based applications, and want to utilize an existing server technology such as Java to develop RIAs, this book is for you. Targeting developers who want to get started with Adobe Flex 3 programming, this simple and clear handbook introduces Flex technology quickly and straightforwardly. Utilizing your existing knowledge of Java, it gives you the insight and hands-on experience to program with Flex 3. This book provides comprehensive information on various aspects of Flex 3 and ActionScript 3.0. These include developing simple applications, handling events, creating custom components and events, using RPC services, integration with Java and BlazeDS, styling and formatting, and how to package and deploy Flex applications. You will start with downloading, installing and configuring Flex 3 SDK and Flex Builder 3 and learn basic concepts such as what MXML and ActionScript are, understanding UI components, controls, compilers, and more. Further you will develop simple applications and slowly advance into more depth where you will learn advanced concepts such as creating custom components, debugging, integrating with Java, using RPC services, styling, internationalizing, and deploying Flex applications, and more. One of the things you're really going to love about this book is that you will develop a full-blown e-commerce application using a combination of Flex 3, ActionScript 3.0, BlazeDS 3.2, and Java. At the end of the book you will have the knowledge and experience needed to develop Rich Internet Applications.
Table of Contents (18 chapters)
Flex 3 with Java
Credits
About the Author
About the Reviewers
Preface
8
Communicating with Server-side Java

Validating and formatting data


When you are building forms for collecting user information, it's often necessary to validate the data entered by the user on the client to avoid unnecessary traffic to the server.

You saw how to add the required field indicators (*) in forms using the required field property of the FormItem control. However, this does not perform any validating; this just adds a red asterisk symbol before the field. To perform validation, you need to implement Flex framework validators.

The Flex framework provides common validators for validating common strings and number-based data, such as phone number, email address, and so on. The following list shows the available validators in Flex for common data entry needs:

Validators

Description

<mx:CreditCardValidator>

For validating credit card information

<mx:CurrencyValidator>

For currency

<mx:DateValidator>

For validating dates

<mx:EmailValidator>

For validating email addresses

&lt...