Book Image

Backbase 4 RIA Development

Book Image

Backbase 4 RIA Development

Overview of this book

Backbase is a very powerful and complex JavaScript library, with many user interface components to help make web development easier. It allows the development of Rich Internet Applications (RIA) that run within all major browsers but its powers and complexity mean that the choice of component can be overwhelming. Understanding when and how to use the right component might not always be straightforward. This book makes that easier. This is a practical book that teaches you how to use the Backbase Client Framework effectively, with a complete overview and many examples. A core developer of the framework puts the technologies used into a wider perspective of existing web standards and a seasoned software architect explains why XML-based UI definition produces better web applications. The transparent use of AJAX technologies, for example to submit forms, or to retrieve updates for data grids, can be taken for granted with the Backbase framework. Packed with examples, the book shows you how to get the most from the library of UI components, and then extend the library with its own custom language. With this book in hand, it is easy to enable AJAX within your web application. You will be able to use the Backbase framework effectively, from basic applications to complex, custom-defined UI components. This book contains a complete overview of all the UI libraries available within the Backbase framework and shows examples for each element described. The Backbase framework offers an innovative Tag Definition Language (TDL), which allows developers to create new UI components that can be used as XML elements, in the same way as using the built-in GUI library. Using TDL brings considerable development advantages, and this book explains how. Significant attention is also given to architectural aspects of designing a web-application, showing sample applications using a model-view-controller approach.
Table of Contents (16 chapters)
Backbase 4 RIA Development
About the Authors
About the Reviewers

Widgets as objects

In the introductory sections of this chapter, we have already discussed TDL as an object-oriented language. We will now look at the TDL elements involved in more detail.

Defining classes with TDL

You already know how to create a TDL class definition: this is done by defining an element with the name element, where the name attribute is the name of the class.

All the elements that define the state and behavior of a TDL class are defined using child tags of the element tag.

In TDL, you use property elements to the define the state of an object. We have seen the attribute element that may seem similar to a property. However, attributes and properties are not the same:



An attribute is always of type string and its value can be set like any XHTML attribute when placing the widget on a page.

Properties can be of any type, including of type object.

Attributes can be retrieved by using the getAttribute method.

Properties can be retrieved by using the getProperty...