动手学习jQuery：构建互动前端的实战指南

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"《Learning jQuery：动手指南，构建丰富的交互式Web前端》是Addison-Wesley Learning Series系列的一部分，该系列专注于提供实践导向的编程教程，帮助读者快速掌握新技术或语言，以便立即应用所学知识。本书以实战为主导，通过深入浅出的方式引导读者进入jQuery的世界。书中包含示例代码，这些代码经过详尽注释，可以直接在个人项目中复用，无需任何限制。作者通过章节间的练习题，鼓励读者检验所学知识，进行代码调整，以此加深理解和熟练程度。学习过程中，本书强调实践操作，确保读者能够立即上手，并将所学技术运用到实际工作中。作为一本动手指南，它不仅介绍了jQuery的基础概念，还涵盖了丰富的交互设计技巧和实现策略，如DOM操作、事件处理、动画效果和Ajax通信等，使读者能够构建功能强大的动态网页。该书适合Web开发者初学者，也对有一定基础的开发者提供进阶学习的机会。 Addison-Wesley Learning Series是一套全球发行的高质量出版物，覆盖多个城市，包括但不限于美国的Upper Saddle River、Boston、印度纳波利斯等地。对于想深入了解jQuery并提升Web前端开发技能的人来说，《Learning jQuery》是一本不可或缺的参考资料。如果你对这本书感兴趣，可以在InformIT网站的Learning Series部分查找更多出版物，或者直接在美国亚马逊官网搜索获取详细信息。通过这本书，读者将建立起坚实的jQuery基础，为创建富有活力和交互性的Web应用打下坚实基础。"

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Contents

About the Author

Ralph Steyer is a computer programmer, consultant, journalist, and book author with

decades of experience in a wide variety of computer programming languages and technologies.

He has a degree in mathematics from Frankfurt/Main University and is the author of

several books on web programming, including JavaScript Handbook and AJAX Frameworks

(Addison-Wesley).

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Introduction

Rich Internet Applications (RIAs), with their somewhat vaguely worded rich opportunities, have

significantly changed the way we use the Web over the past few years. And the speed of this

change keeps increasing. The significance of classic desktop applications is being repositioned.

Many types of programs that were traditionally used only as desktop application now suddenly

appear on the Web, be it personal calendars, entire office programs, games, route planners, or

communication programs. But apps for cell phones or smartphones are also increasingly based

on web technology. This changes both the user behavior and the user expectation for Internet

applications in general and the availability of services. As classic web applications, but with a

certain extra value, RIAs are, on the one hand, always available if you have a halfway decent

Internet access and a modern browser.

On the other hand, they are hardly distinguishable

any more from classic desktop or mobile apps in terms of operation, performance, and visual

appearance.

The most effective way to ensure that these rich opportunities are available usually involves

using an appropriate web framework. Be aware, however, that if you use a framework, you

become significantly dependent on a manufacturer or a project, and that you then no longer

have complete control over the source code in your applications. In any case, using frameworks

requires familiarizing yourself sufficiently with the relevant function libraries and working

methods of the system. In contrast to grandiose advertising claims of some frameworks (and

some tools), you can usually use them effectively only after you understand web programming

concepts and have at least a basic knowledge of the underlying technology. Strictly speaking,

you will profit most from frameworks the less you actually need them and the more you master

the basics.

Regardless of these problems and disadvantages, however, there is much to be said for making

use of frameworks and toolkits. They will certainly help you develop and maintain sophisti-

cated websites much more quickly, effectively, and efficiently; and they enable you to offer a

richer and more robust site.

1. The browser becomes a multifunctional access instrument for a specific task and thus replaces clas-

sic application types. In the future, users might only need a browser as application, or the operating sys-

tem and the browser may merge so that they become indistinguishable.

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Chapter 1 Introduction

Note

The preceding text included the terms framework and toolkit a few times. There is no standard

definition for exactly what a framework is and how it differs from a toolkit. In fact, a reliable def-

inition and differentiation is not very straightforward. But generally, the term framework implies

a programming framework that already offers certain functionalities. A framework is not yet a

finished program in itself, but merely provides a frame within which one or several programmers

can create an application. A framework usually contains a library with useful predefined code

structures, but also (in contrast to a pure library) specifies a certain control of the behavior pat-

terns involved in using it (for example, a syntax or grammar). With a toolkit, the main focus is

on a collection of programs (tools), but these can also be based on specific libraries or

a syntax concept. Both a framework and, in particular, toolkits often provide widgets or

components—in other words, elements that constitute a graphical user interface (GUI).

1.1 What Is This Book About?

This book provides an easy introduction to web programming with jQuery, jQuery UI , and

Mobile jQuery . jQuery is a free and comprehensive framework built on top of the JavaScript

language. It was originally developed by John Resig and released in January 2006 at BarCamp

(NYC). It is now consistently developed further as an open source project. jQuery UI is built

on top of jQuery and extends the jQuery framework with UI specific components. Similarly,

jQuery Mobile is also built on top of jQuery and extends the jQuery framework with mobile

device-specific components.

The framework offers a whole range of very helpful features (for example, easy-to-use functions

for DOM manipulation and navigation, as well as basic AJAX support). Beyond this, the frame-

work offers support for Cascading Style Sheets (CSS), an expanded event system, impressive

effects and animations, various auxiliary functions, and numerous free plug-ins.

But where jQuery particularly excels is the seamless integration of the framework in many

web platforms by large industry providers or their official support. For example, Microsoft uses

jQuery in the development environment Visual Studio in combination with the ASP.NET MVC

framework and Microsoft Asynchronous JavaScript and XML (AJAX). For example, if you create

a new ASP.NET project, you can also integrate jQuery automatically (although not necessarily

in the latest version).

In an ASP.NET MVC 3 or later web application in Visual Studio, you can even choose to inte-

grate some jQuery plug-ins (such as jquery.validate.js for validating user input).

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