AJAX实战实例详解：威曼的清晰指南

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本文档是一本名为《AJAX实战》的书籍，作者包括DAVE CRANE、BEARBIBEAULT、JORDSONNEVELD等多名专家，共同编撰了一本深入浅出的AJAX技术指南。AJAX全称为Asynchronous JavaScript and XML，是一种用于创建交互式网页应用程序的技术，通过异步数据交换，使得用户在无需刷新整个页面的情况下与服务器进行实时通信，从而提升用户体验。书中详细讲解了AJAX的工作原理、关键技术和实际应用示例，涵盖了以下几个核心知识点： 1. **AJAX基础**：介绍了AJAX的起源和发展，以及它如何利用JavaScript、XMLHttpRequest对象（XHR）实现非阻塞的数据请求和响应。 2. **事件驱动编程**：展示了如何通过监听DOM（文档对象模型）事件来触发AJAX请求，比如点击、表单提交等，实现了动态更新网页内容。 3. **数据处理**：涵盖了XML、JSON等数据格式的解析和处理，以及如何将服务器返回的数据有效地整合到HTML页面中。 4. **错误处理与安全性**：讨论了处理网络请求失败的策略，以及如何确保AJAX应用的安全性，例如跨站脚本攻击（XSS）和跨站请求伪造（CSRF）的防范。 5. **高级技巧**：包括AJAX库（如jQuery、axios等）的使用，以及性能优化、响应式设计等方面的应用实践。 6. **实例详解**：书中提供了丰富的代码示例，帮助读者理解AJAX技术在实际项目中的应用，如动态加载内容、表单验证、数据图表更新等场景。 7. **版权与授权**：最后，文档强调了版权信息，指出未经出版商许可，不得复制或传播书中的内容，同时也提到了订购和联系Manning Publications获取更多信息的方式。《AJAX实战》是一本适合初学者和有一定经验的开发者深入学习AJAX技术的实用教程，有助于提升前端开发人员构建现代Web应用的技能。无论是想要了解AJAX基础知识还是寻求实战项目指导的读者，都能在这本书中找到所需的知识。

acknowledgments

This section of a book always includes a surprisingly long list of names

because it is indeed a collaborative effort of many different talents that results

in the book that you are now holding. We have learned that firsthand! The

authors do not work alone, although the long hours spent at the keyboard

sometimes make it feel that way.

The publisher and editors at Manning Publications worked along with us,

every step of the way, making sure the book was as good as it could be and we

would like to thank them for their encouragement, insistence on quality, and

attention to detail. There are many people who worked behind the scenes

and we would like to acknowledge them here, along with publisher Marjan

Bace and our editor Mike Stephens: Karen Tegtmayer, Howard Jones, Liz

Welch, Dottie Marsico, Katie Tennant, Mary Piergies, Gabriel Dobrescu, Ron

Tomich, and Olivia DiFeterici.

Our peer reviewers made many contributions, both large and small, to the

manuscript during development, from catching errors in the code and typos in

the text to suggestions on how to organize a chapter. The manuscript was

reviewed a number of times and each pass resulted in a much better book. We

would like to thank the following reviewers for taking time out of their busy

schedules to read our chapters: Curt Christianson, Anil Radhakrishna, Robert

W. Anderson, Srinivas Nallapati, Ernest Friedman-Hill, Jeff Cunningham,

Christopher Haupt, Bas Vodde, Bill Fly, Ryan Lowe, Aleksey Nudelman, Lucas

xvi ACKNOWLEDGMENTS

Carlson, Derek Lakin, Jonas Trindler, Eric Pascarello, Joel Webber, Jonathon

Esterhazy, and Benjamin Gorlick.

Special thanks to Valentin Crettaz who was the technical editor of the book.

He checked the code and reread certain chapters a number of times as we final-

ized them during production. His efforts are much appreciated.

Finally, thanks to Ted Goddard, Chris Gray, Ram Venkataraman, and Joe

Walker for their valuable contributions to the book on topics where they are the

experts. We appreciate their collaboration with us on this project.

Dave Crane

I’d like to thank my colleagues Simon Warrick, Tim Wilson, Susannah Ellis,

Simon Crossley, Rob Levine, and Miles Wilson at Historic Futures for their sup-

port for this project, and to Wendy, Nic, Graeme, and the team at Skillsmat-

ter.com—and all my talented students—for helping to shape my thoughts on how

this book should be written. Finally, and by no means least, I’d like to thank the

rest of the Crane family—Chia, Ben, and Sophie—for putting up with me while I

wrote two more programming books in parallel, my Mum and Dad, and my cats,

for making good use of the hot air from the fan exhaust of my laptop during late

night writing sessions.

Bear Bibeault

There are so many people to acknowledge and to thank. I want to thank all my

friends and fellow staffers at javaranch.com, who offered encouragement when I

expressed an interest in writing, and who include (but are not limited to): Ernest

Friedman-Hill, Ben Souther, Max Habibi, Mark Herschberg, and Kathy Sierra.

Special thanks go to Paul Wheaton, owner of javaranch.com, for creating such

a wonderful site and putting his trust in its staffers, and to Eric Pascarello for rec-

ommending me to Manning.

I want to thank my dogs Gizmo, Cozmo, and Little Bear, who provided com-

panionship by lying on my feet as I penned these chapters and code. Cozmo gets

special thanks for contributing random characters by swatting at the laptop key-

board as I typed. Thank goodness for editors.

And I want to thank my partner Jay, who put up with all the long hours it took

to work on two books in parallel and with all the ranting about Internet Explorer

and Word, and who offered nothing but encouragement for my efforts.

ABOUT THIS BOOK xix

■

Work hands-on with professional-grade reusable Ajax code designed to

solve real problems.

Audience

This book is aimed at web developers who want their applications to be best-in-class

examples of rich user interfaces, leveraging Ajax technology to achieve this goal.

While novices to Ajax will find the first two chapters helpful in getting kick-

started into the world of asynchronous requests, this book is primarily aimed at

developers with at least a basic background in developing web applications and

in the rudimentary use of JavaScript to effect client-side activity.

In the new world of rich client-side user interfaces, the amount of client-side

code has greatly increased and it is important to treat this code with the same

level of respect due its server-side counterpart. Advanced JavaScript techniques

that help to organize this client-side code and to use Ajax effectively are pre-

sented in this book.

If you are a web developer interested in expanding your coding skills not

only with new technologies, but also with techniques and patterns that make the

best use of that technology, we think that you will find that this book addresses

those needs.

Whether you are a seasoned client-side developer, or one that is just starting

out creating rich user interfaces to your web applications, we hope this book will

have something for you.

Roadmap

We’ve divided this book into two parts. Part 1, “Fundamentals of Ajax,” includes

four introductory chapters that make sure that you’ve got the know-how under

your belt that you’ll need to make best use of the second part of the book. The

chapters in part 2, “Ajax Best Practices,” present various practical topics in cli-

ent-side programming, with an emphasis on using Ajax directly, or on practices

and principles that work well in Ajax-enabled applications.

Chapter 1 dives head first into what makes Ajax different from other technol-

ogies and why there’s so much to be written (and learned) about it. It presents a

crash course in using Ajax across the various browsers and how to deal with the

responses it generates. Finally it closes with a brief look at how use of the Proto-

type library makes the whole process more streamlined.

In chapter 2, we examine the various categories of Ajax communication

including

JSON, XML and XSLT. We’ll also investigate the use of Ajax with SOAP

web services.

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