jQuery新手到高手：全面指南与实例解析

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《jQuery从新手到专家：由Earle Castledine和Craig Sharkie撰写》是一本深入浅出的jQuery教程，适合初学者和希望提升技能的开发人员阅读。这本书全面介绍了jQuery的基础知识和高级应用，旨在帮助读者掌握这个流行的JavaScript库，从而提高网页交互和动态效果的开发能力。 **第1章：Falling in Love with jQuery** 本书首先以激发读者对jQuery的兴趣开篇，概述了其在Web开发中的重要性和简洁易用性。通过实例展示，让新手理解jQuery如何简化DOM操作和事件处理。 **第2-9章：进阶主题** 1. **选择、装饰与增强**：这部分讲解了如何使用jQuery选择器高效地定位和操作HTML元素，以及如何通过CSS样式和动画功能美化页面。 2. **动画、滚动和调整大小**：深入探讨了如何使用jQuery创建平滑的动画效果，以及如何实现网页滚动和窗口大小调整的响应式设计。 3. **图像和幻灯片展示**：介绍如何使用jQuery控制图片和创建动态的幻灯片展示，如淡入淡出和切换效果。 4. **菜单、标签、提示和面板**：讲解如何构建用户友好的导航和组件，如下拉菜单、选项卡、工具提示和可折叠面板。 5. **构造、Ajax和互动性**：涵盖了使用jQuery进行前后端通信（Ajax）的基本原理，以及如何增强用户体验和交互性。 6. **表单、控件和对话框**：展示了如何利用jQuery处理表单输入、验证和创建模态对话框等复杂功能。 7. **列表、树和表格**：讲解如何使用jQuery操作数据驱动的列表、树状结构和表格，实现动态数据管理和显示。 8. **插件、主题和高级话题**：深入探讨jQuery插件的使用，以及如何定制和扩展jQuery的功能，并涉及了一些高级主题和设计模式。 **附录与参考资料** A. **参考材料**：提供了一个详尽的索引，方便读者查找特定功能或概念的详细介绍。 B. **JavaScript小贴士**：包含实用的JavaScript技巧，帮助读者扩展对整个JavaScript语言的理解。 C. **插件助手**：指导读者如何编写和使用自定义jQuery插件。 **版权与授权** 作者确保了版权权益，所有内容未经许可不得复制、存储或传输。《jQuery: Novice to Ninja》的初版发行于2010年2月，涵盖了由Program Director Andrew Tetlaw领导的团队的工作成果，包括技术编辑Louis Simoneau、编辑Kelly Steele等多位专业人士的贡献。《jQuery从新手到专家》是一本循序渐进的教程，无论是希望通过jQuery入门，还是希望提升技能的开发者，都能从中受益匪浅，掌握这一强大的前端工具。

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Flags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 373

Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 374

Callbacks and Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 376

$.support Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 376

Events . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 379

Event Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 379

Event Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 380

DIY Event Objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 380

Appendix B JavaScript Tidbits . . . . . . . . . . . . . . . . . . . . . . 381

Type Coercion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 381

Equality Operators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 382

Truthiness and Falsiness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 383

Appendix C Plugin Helpers . . . . . . . . . . . . . . . . . . . . . . . . . . . 387

Selector and Context . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 387

The jQuery Stack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 388

Minification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 389

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 393

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Preface

No matter what kind of ninja you are—a cooking ninja, a corporate lawyer ninja, or

an actual ninja ninja—virtuosity lies in first mastering the basic tools of the trade.

Once conquered, it’s then up to the full-fledged ninja to apply that knowledge in

creative and inventive ways.

In recent times, jQuery has proven itself to be a simple but powerful tool for taming

and transforming web pages, bending even the most stubborn and aging browsers

to our will. jQuery is a library with two principal purposes: manipulating elements

on a web page, and helping out with Ajax requests. Sure, there are quite a few

commands available to do this—but they’re all consistent and easy to learn. Once

you’ve chained together your first few actions, you’ll be addicted to the jQuery

building blocks, and your friends and family will wish you’d never discovered it!

On top of the core jQuery library is jQuery UI: a set of fine-looking controls and

widgets (such as accordions, tabs, and dialogs), combined with a collection of full-

featured behaviors for implementing controls of your own. jQuery UI lets you quickly

throw together awesome interfaces with little effort, and serves as a great example

of what you can achieve with a little jQuery know-how.

At its core, jQuery is a tool to help us improve the usability of our sites and create

a better user experience. Usability refers to the study of the principles behind an

object’s perceived efficiency or elegance. Far from being merely flashy, trendy design,

jQuery lets us speedily and enjoyably sculpt our pages in ways both subtle and ex-

treme: from finessing a simple sliding panel to implementing a brand-new user in-

teraction you invented in your sleep.

Becoming a ninja isn’t about learning an API inside out and back to front—that’s

just called having a good memory. The real skill and value comes when you can

apply your knowledge to making something exceptional: something that builds on

the combined insights of the past to be even slightly better than anything anyone

has done before. This is certainly not easy—but thanks to jQuery, it’s fun just trying.

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Who Should Read This Book

If you’re a front-end web designer looking to add a dash of cool interactivity to your

sites, and you’ve heard all the buzz about jQuery and want to find out what the fuss

is about, this book will put you on the right track. If you’ve dabbled with JavaScript,

but been frustrated by the complexity of many seemingly simple tasks, we’ll show

you how jQuery can help you. Even if you’re familiar with the basics of jQuery, but

you want to take your skills to the next level, you’ll find a wealth of good coding

advice and in-depth knowledge.

You should already have intermediate to advanced HTML and CSS skills, as jQuery

uses CSS-style selectors to zero in on page elements. Some rudimentary programming

knowledge will be helpful to have, as jQuery—despite its clever abstractions—is

still based on JavaScript. That said, we’ve tried to explain any JavaScript concepts

as we use them, so with a little willingness to learn you’ll do fine.

What’s in This Book

By the end of this book, you’ll be able to take your static HTML and CSS web pages

and bring them to life with a bit of jQuery magic. You’ll learn how to select elements

on the page, move them around, remove them entirely, add new ones with Ajax,

animate them … in short, you’ll be able to bend HTML and CSS to your will! We

also cover the powerful functionality of the jQuery UI library.

This book comprises the following nine chapters. Read them in order from beginning

to end to gain a complete understanding of the subject, or skip around if you only

need a refresher on a particular topic.

Chapter 1: Falling in Love with jQuery

Before we dive into learning all the ins and outs of jQuery, we’ll have a quick

look at why you’d want to use it in the first place: why it’s better than writing

your own JavaScript, and why it’s better than the other JavaScript libraries out

there. We’ll brush up on some CSS concepts that are key to understanding

jQuery, and briefly touch on the basic syntax required to call jQuery into action.

Chapter 2: Selecting, Decorating, and Enhancing

Ostensibly, jQuery’s most significant advantage over plain JavaScript is the ease

with which it lets you select elements on the page to play with. We’ll start off

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this chapter by teaching you how to use jQuery’s selectors to zero in on your

target elements, and then we’ll look at how you can use jQuery to alter those

elements’ CSS properties.

Chapter 3: Animating, Scrolling, and Resizing

jQuery excels at animation: whether you’d like to gently slide open a menu, or

send a dialog whizzing across the screen, jQuery can help you out. In this

chapter, we’ll explore jQuery’s wide range of animation helpers, and put them

into practice by enhancing a few simple user interface components. We’ll also

have a quick look at some animation-like helpers for scrolling the page and

making elements resizable.

Chapter 4: Images, Slideshows, and Cross-fading

With the basics well and truly under our belts, we’ll turn to building some of

the most common jQuery widgets out there: image galleries and slideshows.

We’ll learn how to build lightbox displays, scrolling thumbnail galleries, cross-

fading galleries, and even take a stab at an iPhoto-style flip-book.

Chapter 5: Menus, Tabs, Tooltips, and Panels

Now that we’re comfortable with building cool UI widgets with jQuery, we’ll

dive into some slightly more sophisticated controls: drop-down and accordion-

style menus, tabbed interfaces, tooltips, and various types of content panels.

We’re really on a roll now: our sites are looking less and less like the brochure-

style pages of the nineties, and more and more like the Rich Internet Applications

of the twenty-first century!

Chapter 6: Construction, Ajax, and Interactivity

This is the one you’ve all been waiting for: Ajax! In order to make truly desktop-

style applications on the Web, you need to be able to pass data back and forth

to and from the server, without any of those pesky refreshes clearing your inter-

face from the screen—and that’s what Ajax is all about. jQuery includes a raft

of convenient methods for handling Ajax requests in a simple, cross-browser

manner, letting you leave work with a smile on your face. But before we get too

carried away—our code is growing more complex, so we’d better take a look at

some best practices for organizing it. All this and more, in Chapter 6.

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Chapter 7: Forms, Controls, and Dialogs

The bane of every designer, forms are nonetheless a pivotal cornerstone of any

web application. In this chapter, we’ll learn what jQuery has to offer us in terms

of simplifying our form-related scripting. We’ll learn how to validate forms on

the fly, offer assistance to our users, and manipulate checkboxes, radio buttons,

and select lists with ease. Then we’ll have a look at some less conventional

ways of allowing a site’s users to interact with it: a variety of advanced controls

like date pickers, sliders, and drag and drop. We’ll round it off with a look at

modal dialogs in the post-popup world, as well as a few original nonmodal

notification styles. What a chapter!

Chapter 8: Lists, Trees, and Tables

No matter how “Web 2.0” your application may be, chances are you’ll still need

to fall back on the everyday list, the humdrum tree, or even the oft-derided table

to present information to your users. This chapter shows how jQuery can make

even the boring stuff fun, as we’ll learn how to turn lists into dynamic, sortable

data, and transform tables into data grids with sophisticated functionality.

Chapter 9: Plugins, Themes, and Advanced Topics

jQuery is more than just cool DOM manipulation, easy Ajax requests, and funky

UI components. It has a wealth of functionality aimed at the more ninja-level

developer: a fantastic plugin architecture, a highly extensible and flexible core,

customizable events, and a whole lot more. In this chapter, we’ll also cover the

jQuery UI theme system, which lets you easily tailor the appearance of jQuery

UI widgets to suit your site, and even make your own plugins skinnable with

themes.

Where to Find Help

jQuery is under active development, so chances are good that, by the time you read

this, some minor detail or other of these technologies will have changed from what’s

described in this book. Thankfully, SitePoint has a thriving community of JavaScript

and jQuery developers ready and waiting to help you out if you run into trouble.

We also maintain a list of known errata for this book, which you can consult for the

latest updates; the details are below.

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