Book Image

YUI 2.8: Learning the Library

Book Image

YUI 2.8: Learning the Library

Overview of this book

The YUI Library is a set of utilities and controls written in JavaScript for building Rich Internet Applications, across all major browsers and independently of any server technology. There's a lot of functionality baked into YUI, but getting to and understanding that functionality is not for the faint of heart. This book gives you a clear picture of YUI through a step-by-step approach, packed with lots of examples.YUI 2.8: Learning the Library covers all released (non-beta) components of the YUI 2.8 Library in detail with plenty of working examples, looking at the classes that make up each component and the properties and methods that can be used. It includes a series of practical examples to reinforce how each component should/can be used, showing its use to create complex, fully featured, cross-browser, Web 2.0 user interfaces. It has been updated from its first edition with the addition of several chapters covering several new controls and enriched with lots of experience of using them.You will learn to create a number of powerful JavaScript controls that can be used straightaway in your own applications. Besides giving you a deep understanding of the YUI library, this book will expand your knowledge of object-oriented JavaScript programming, as well as strengthen your understanding of the DOM and CSS. The final chapter describes many of the tools available to assist you the developer in debugging, maintaining, and ensuring the best quality in your code. In this new edition, all the examples have been updated to use the most recent coding practices and style and new ones added to cover newer components. Since the basic documentation for the library is available online, the focus is on providing insight and experience.The authors take the reader from beginner to advanced-level YUI usage and understanding.
Table of Contents (18 chapters)
YUI 2.8 Learning the Library
About the Authors
About the Reviewers

A closer look at the response object

When the callback functions are called they will receive a response object as an argument. The response object has the following properties:

  • tId: A unique reference to this transaction

  • status: The HTTP status code

  • statusText: The HTTP status text

  • responseText: The reply in text format

  • responseXML: The reply in XML format

  • argument: Any arguments passed in the request

If the transaction fails, the response properties will be empty. The tId is mostly for internal use and we hardly care about it. The status and statusText are the usual HTTP codes, like the infamous 404 Not Found, or hopefully, 200 OK. If the communication was successful we will get either of the response properties. For XML data, responseXML will provide us with an XML DOM object representing that reply; for all other replies (even for badly formatted XML) we get it in responseText.

One of the properties we can set in the configuration object when calling .asyncRequest() is argument...