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
Credits
About the Authors
About the Reviewers
Preface

Debugging


If we can't get things working, we need to go to our debugger. Most major browsers have their debuggers. The most popular for quite some time and, perhaps, the most evolved is FireBug (http://getfirebug.com/) a free debugger for the equally free Firefox browser (http://www.mozilla.com/) available for most operating systems. Internet Explorer has recently incorporated a debugger and Safari has had one for some time now.

Most of them are pretty intuitive and, anyway, each has its own documentation. We'll just mention a few things as they relate to the YUI Library.

JavaScript always tries to carry on in spite of errors. Sometimes an error that is not immediately fatal allows the interpreter to keep going until it really gets messed up and stops. At that point, the error is long past and hard to find. It is better to run all debuggers with the "break on all errors" (or however it might be called in each debugger) option on. This makes the interpreter stop at the first hint of an error...