jQuery CookBook：专家指南

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"jQuery CookBook" 《jQuery CookBook》是一本由jQuery社区专家编写的书籍，旨在帮助读者深入理解和掌握jQuery库的使用技巧。该书由Cody Lindley撰写，版权归属2010年的Cody Lindley。这本书在美国印刷出版，由O'Reilly Media, Inc.发行。 jQuery是一款广泛使用的JavaScript库，它简化了HTML文档遍历、事件处理、动画以及Ajax交互等任务。《jQuery CookBook》的内容涵盖了jQuery的核心功能和高级应用，是开发者提升jQuery技能的实用参考资料。书中可能包含了各种代码示例、最佳实践和解决方案，帮助开发者解决在实际项目中遇到的问题。编辑团队包括由Simon St. Laurent领导的编辑团队，Sarah Schneider担任生产编辑，Kim Wimpsett负责校对，Andrea Fox作为校阅者，以及由Molly Sharp管理的生产服务团队。此外，Fred Brown负责索引，封面设计由Karen Montgomery完成，内页设计出自David Futato之手，插图由Robert Romano绘制，第一版于2009年11月发布。本书适合教育、商业或销售推广使用，同时也提供在线版本（http://my.safaribooksonline.com）。对于团体购买或企业客户，可以通过联系O'Reilly的公司/机构销售部门800-998-9938或corporate@oreilly.com获取更多信息。通过阅读《jQuery CookBook》，读者可以学习到如何利用jQuery高效地进行网页动态效果的创建、DOM操作、事件处理、AJAX通信等，从而提高网页开发效率和用户体验。此外，书中可能还讨论了性能优化、插件开发以及与其它库的集成策略，使开发者能够更好地应对复杂项目的需求。无论你是初学者还是经验丰富的开发者，这本书都能为你提供宝贵的知识和实践经验。

on client-side optimization techniques as well as speaking and writing about jQuery.

His website is http://www.codylindley.com.

Remy Sharp is a developer, author, speaker, and blogger. Remy started his professional

web development career in 1999 as the sole developer for a finance website and, as

such, was exposed to all aspects of running the website during, and long after, the

dotcom boom. Today he runs his own development company called Left Logic in

Brighton, UK, writing and coding JavaScript, jQuery, HTML 5, CSS, PHP, Perl, and

anything else he can get his hands on.

Mike Hostetler is an inventor, entrepreneur, programmer, and proud father. Having

worked with web technologies since the mid-1990s, Mike has had extensive experience

developing web applications with PHP and JavaScript. Currently, Mike works at the

helm of A Mountain Top, LLC, a web technology consulting firm in Denver, Colorado.

Heavily involved in open source, Mike is a member of the jQuery core team, leads the

QCubed PHP5 Framework project, and participates in the Drupal project. When not

in front of a computer, Mike enjoys hiking, fly fishing, snowboarding, and spending

time with his family.

Ralph Whitbeck is a graduate of the Rochester Institute of Technology and is currently

a senior developer for BrandLogic Corporation in Rochester, New York. His respon-

sibilities at BrandLogic include interface design, usability testing, and web and appli-

cation development. Ralph is able to program complex web application systems in

ASP.NET, C#, and SQL Server and also uses client-side technologies such as XHTML,

CSS, and JavaScript/jQuery in order to implement client-approved designs. Ralph of-

ficially joined the jQuery team as an evangelist in October 2009. Ralph enjoys spending

time with his wife, Hope, and his three boys, Brandon, Jordan, and Ralphie. You can

find out more about Ralph on his personal blog.

Nathan Smith is a goofy guy who has been building websites since late last century.

He enjoys hand-coding HTML, CSS, and JavaScript. He also dabbles in design and

information architecture. He has written for online and paper publications such as

Adobe Developer Center, Digital Web, and .NET Magazine. He has spoken at venues

including Adobe MAX, BibleTech, Drupal Camp, Echo Conference, Ministry 2.0, Re-

fresh Dallas, and Webmaster Jam Session. Nathan works as a UX developer at Fellow-

shipTech.com. He holds a Master of Divinity degree from Asbury Theological Semi-

nary. He started Godbit.com, a community resource aimed at helping churches and

ministries make better use of the Web. He also created the 960 Grid System, a frame-

work for sketching, designing, and coding page layouts.

Brian Cherne is a software developer with more than a decade of experience blue-

printing and building web-based applications, kiosks, and high-traffic e-commerce

websites. He is also the author of the hoverIntent jQuery plugin. When not geeking

out with code, Brian can be found ballroom dancing, practicing martial arts, or studying

Russian culture and language.

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Jörn Zaefferer is a professional software developer from Cologne, Germany. He cre-

ates application programming interfaces (APIs), graphical user interfaces (GUIs), soft-

ware architectures, and databases, for both web and desktop applications. His work

focuses on the Java platform, while his client-side scripting revolves around jQuery.

He started contributing to jQuery in mid-2006 and has since cocreated and maintained

QUnit, jQuery’s unit testing framework; released and maintained a half dozen very

popular jQuery plugins; and contributed to jQuery books as both author and tech

reviewer. He is also a lead developer for jQuery UI.

James Padolsey is an enthusiastic web developer and blogger based in London, UK.

He’s been crazy about jQuery since he first discovered it; he’s written tutorials teaching

it, articles and blog posts discussing it, and plenty of plugins for the community. James’

plans for the future include a computer science degree from the University of Kent and

a career that allows him to continually push boundaries. His website is http://james

.padolsey.com.

Scott González is a web application developer living in Raleigh, North Carolina, who

enjoys building highly dynamic systems and flexible, scalable frameworks. He has been

contributing to jQuery since 2007 and is currently the development lead for jQuery UI,

jQuery’s official user interface library. Scott also writes tutorials about jQuery and

jQuery UI on nemikor.com and speaks about jQuery at conferences.

Michael Geary started developing software when editing code meant punching a paper

tape on a Teletype machine, and “standards-compliant” meant following ECMA-10

Standard for Data Interchange on Punched Tape. Today Mike is a web and Android

developer with a particular interest in writing fast, clean, and simple code, and he enjoys

helping other developers on the jQuery mailing lists. Mike’s recent projects include a

series of 2008 election result and voter information maps for Google; and StrataLogic,

a mashup of traditional classroom wall maps and atlases overlaid on Google Earth. His

website is http://mg.to.

Maggie Wachs, Scott Jehl, Todd Parker, and Patty Toland are Filament Group.

Together, they design and develop highly functional user interfaces for consumer- and

business-oriented websites, wireless devices, and installed and web-based applications,

with a specific focus on delivering intuitive and usable experiences that are also broadly

accessible. They are sponsor and design leads of the jQuery UI team, for whom they

designed and developed ThemeRoller.com, and they actively contribute to ongoing

development of the official jQuery UI library and CSS Framework.

Richard D. Worth is a web UI developer. He is the release manager for jQuery UI and

one of its longest-contributing developers. He is author or coauthor of the Dialog,

Progressbar, Selectable, and Slider plugins. Richard also enjoys speaking and consulting

on jQuery and jQuery UI around the world. Richard is raising a growing family in

Northern Virginia (Washington, D.C. suburbs) with his lovely wife, Nancy. They have

been blessed to date with three beautiful children: Naomi, Asher, and Isaiah.

Richard’s website is http://rdworth.org/.

Contributors | xv

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Tech Editors

Karl Swedberg, after having taught high school English, edited copy for an advertising

agency, and owned a coffee house, began his career as a web developer four years ago.

He now works for Fusionary Media in Grand Rapids, Michigan, where he specializes

in client-side scripting and interaction design. Karl is a member of the jQuery project

team and coauthor of Learning jQuery 1.3 and jQuery Reference Guide (both published

by Packt). You can find some of his tips and tutorials at http://www.learningjquery.com.

Dave Methvin is the chief technology officer at PCPitstop.com and one of the founding

partners of the company. He has been using jQuery since 2006, is active on the jQuery

help groups, and has contributed several popular jQuery plugins including Corner and

Splitter. Before joining PC Pitstop, Dave served as executive editor at both PC Tech

Journal and Windows Magazine, where he wrote a column on JavaScript. He continues

to write for several PC-related websites including InformationWeek. Dave holds bach-

elor’s and master’s degrees in computer science from the University of Virginia.

David Serduke is a frontend programmer who is recently spending much of his time

server side. After programming for many years, he started using jQuery in late 2007

and shortly after joined the jQuery core team. David is currently creating websites for

financial institutions and bringing the benefits of jQuery to ASP.NET enterprise ap-

plications. David lives in northern California where he received a bachelor’s degree

from the University of California at Berkeley in electrical engineering and an MBA from

St. Mary’s College.

Scott Mark is an enterprise application architect at Medtronic. He works on web-based

personalized information portals and transactional applications with an eye toward

maintaining high usability in a regulated environment. His key interest areas at the

moment are rich Internet applications and multitouch user interface technologies. Scott

lives in Minnesota with his lovely wife, two sons, and a black lab. He blogs about

technology at http://scottmark.wordpress.com and long-distance trail running at http://

runlikemonkey.com.

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Preface

The jQuery library has taken the frontend development world by storm. Its dead-simple

syntax makes once-complicated tasks downright trivial—enjoyable, even. Many a de-

veloper has been quickly seduced by its elegance and clarity. If you’ve started using the

library, you’re already adding rich, interactive experiences to your projects.

Getting started is easy, but as is the case with many of the tools we use to develop

websites, it can take months or even years to fully appreciate the breadth and depth of

the jQuery library. The library is chock-full of features you might never have known to

wish for. Once you know about them, they can dramatically change how you approach

the problems you’re called upon to solve.

The goal of this cookbook is to expose you, dear reader, to the patterns and practices

of some of the leading frontend developers who use jQuery in their everyday projects.

Over the course of 18 chapters, they’ll guide you through solutions to problems that

range from straightforward to complex. Whether you’re a jQuery newcomer or a griz-

zled JavaScript veteran, you’re likely to gain new insight into harnessing the full power

of jQuery to create compelling, robust, high-performance user interfaces.

Who This Book Is For

Maybe you’re a designer who is intrigued by the interactivity that jQuery can provide.

Maybe you’re a frontend developer who has worked with jQuery before and wants to

see how other people accomplish common tasks. Maybe you’re a server-side developer

who’s frequently called upon to write client-side code.

Truth be told, this cookbook will be valuable to anyone who works with jQuery—or

who hopes to work with jQuery. If you’re just starting out with the library, you may

want to consider pairing this book with Learning jQuery 1.3 from Packt, or jQuery in

Action from Manning. If you’re already using jQuery in your projects, this book will

serve to enhance your knowledge of the library’s features, hidden gems, and

idiosyncrasies.

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What You’ll Learn

We’ll start out by covering the basics and general best practices—including jQuery in

your page, making selections, and traversing and manipulation. Even frequent jQuery

users are likely to pick up a tip or two. From there, we move on to real-world use cases,

walking you through tried-and-true (and tested) solutions to frequent problems

involving events, effects, dimensions, forms, and user interface elements (with and

without the help of jQuery UI). At the end, we’ll take a look at testing your jQuery

applications and integrating jQuery into complex sites.

Along the way, you’ll learn strategies for leveraging jQuery to solve problems that go

far beyond the basics. We’ll explore how to make the most of jQuery’s event manage-

ment system, including custom events and custom event data; how to progressively

enhance forms; how to position and reposition elements on the page; how to create

user interface elements such as tabs, accordions, and modals from scratch; how to craft

your code for readability and maintainability; how to optimize your code to ease testing,

eliminate bottlenecks, and ensure peak performance; and more.

Because this is a cookbook and not a manual, you’re of course welcome to cherry-pick

the recipes you read; the individual recipes alone are worth the price of admission. As

a whole, though, the book provides a rare glimpse into the problem-solving approaches

of some of the best and brightest in the jQuery community. With that in mind, we

encourage you to at least skim it from front to back—you never know which line of

code will provide the “Aha!” moment you need to take your skills to the next level.

jQuery Style and Conventions

jQuery places a heavy emphasis on chaining—calling methods on element selections

in sequence, confident in the knowledge that each method will give you back a selection

of elements you can continue to work with. This pattern is explained in depth in

Chapter 1—if you’re new to the library, you’ll want to understand this concept, because

it is used heavily in subsequent chapters.

jQuery’s features are organized into a handful of simple categories: core functionality,

selecting, manipulating, traversing, CSS, attributes, events, effects, Ajax, and utilities.

Learning these categories, and how methods fit into them, will greatly enhance your

understanding of the material in this book.

One of the best practices this book will cover is the concept of storing element selections

in a variable, rather than making the same selection repeatedly. When a selection is

stored in a variable, it is commonplace for that variable to begin with the $ character,

indicating that it is a jQuery object. This can make code easier to read and maintain,

but it should be understood that starting the variable name with the $ character is merely

a convention; it carries no special meaning, unlike in other languages such as PHP.

xviii | Preface

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