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Foundations of Ajax
Foundations
of Ajax
Ryan Asleson
Nathaniel T. Schutta
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Foundations of Ajax
Copyright © 2006 by Ryan Asleson and Nathaniel T. Schutta
All rights reserved. No part of this work may be reproduced or transmitted in any form or by any means,
electronic or mechanical, including photocopying, recording, or by any information storage or retrieval
system, without the prior written permission of the copyright owner and the publisher.
ISBN (pbk): 1-59059-582-3
Printed and bound in the United States of America 9 8 7 6 5 4 3 2 1
Trademarked names may appear in this book. Rather than use a trademark symbol with every occurrence
of a trademarked name, we use the names only in an editorial fashion and to the benefit of the trademark
owner, with no intention of infringement of the trademark.
Lead Editor: Ewan Buckingham
Technical Reviewer: Keith Harvey
Editorial Board: Steve Anglin, Dan Appleman, Ewan Buckingham, Gary Cornell, Tony Davis,
Jason Gilmore, Jonathan Hassell, Chris Mills, Dominic Shakeshaft, Jim Sumser
Production Director and Project Manager: Grace Wong
Copy Edit Manager: Nicole LeClerc
Copy Editor: Kim Wimpsett
Assistant Production Director: Kari Brooks-Copony
Production Editor: Linda Marousek
Compositor: Linda Weidemann, Wolf Creek Press
Proofreader: Patrick Vincent
Indexer: Tim Tate
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Cover Designer: Kurt Krames
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The information in this book is distributed on an “as is” basis, without warranty. Although every pre-
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or indirectly by the information contained in this work.
The source code for this book is available to readers at http://www.apress.com in the Source Code section.
 
For Sara and Adam
—Ryan Asleson
To Christine, without whom
none of this would matter
—Nathaniel T. Schutta
 
 
Contents at a Glance
About the Authors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiii
About the Technical Reviewer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xv
Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvii
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xix
n CHAPTER 1
Introducing Ajax . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
n CHAPTER 2
Using the XMLHttpRequest Object . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
n CHAPTER 3
Communicating with the Server:
Sending Requests and Processing Responses . . . . . . . . . . . . . . . . . . 39
n CHAPTER 4
Implementing Basic Ajax Techniques . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
n CHAPTER 5
Building the Ultimate Ajax Developer’s Toolbox . . . . . . . . . . . . . . . . 131
n CHAPTER 6
Testing JavaScript with JsUnit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161
n CHAPTER 7
Exploring JavaScript Debugging
Tools and Techniques . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193
n CHAPTER 8
Putting It All Together . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 219
n APPENDIX A Developing Cross-Browser JavaScript . . . . . . . . . . . . . . . . . . . . . . . . . 251
n APPENDIX B Introducing Ajax Frameworks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 257
n INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 265
v
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