dojo编程指南：打造高效Web应用

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"《精通Dojo》是一本针对JavaScript基础的初学者设计的入门教程，尤其适合那些希望深入了解和掌握Dojo框架的读者。这本书不仅详尽地解释了Dojo API的使用方法，而且深入讲解了如何有效地利用这些工具进行互联网应用程序开发，确保在提升用户体验的同时，也能让开发者在编写过程中感到满足。作者们以其丰富的经验，带领读者穿越Dojo的世界，揭示了这个强大框架背后的复杂性与灵活性。他们特别关注如何在众多的API方法中做出明智选择，并展示了如何通过Dojo构建出令人印象深刻的Web组件，即使对于来自其他编程语言背景的开发者，也能够清晰地理解其JavaScript核心原理。书中强调了JavaScript在Dojo中的关键地位，以及它在现代Web开发项目中的价值。《精通Dojo》不仅提供了技术上的深度指导，还给人一种如同作者亲临指导的感觉，使读者能够在实践中快速上手，体验到Dojo的强大功能。对于寻求提升技能、实现高效开发的软件工程师和应用开发者来说，这是一本不可多得的参考资料，它将助力你在Web应用开发的道路上更进一步。书评人Bill Keese，作为Dijit项目的负责人，高度评价这本书，认为它不仅教导了如何编写能给终端用户留下深刻印象的应用，还兼顾了新入门者和转行者的教学需求。Ian Dees则称赞其为Dojo的“华丽亮相”，揭示了JavaScript的潜力和Dojo在其中的角色，使得原本看似简单的语言变得无比强大且实用。而Brian C. Reeves，作为一名应用开发者，更是强调了这本书的易懂性和实用性，强烈推荐每一个希望提升Web开发技能的读者购买。《精通Dojo》是一本全面而深入的指南，无论是初次接触Dojo的开发者，还是希望深化对其理解的专业人士，都能从中获益匪浅。它不仅教你如何运用Dojo构建高质量的Web应用，还将带你领略JavaScript在现代Web开发中的核心地位，是你在Dojo领域学习和成长的重要资源。"

USING THE BOOK 16

Assumptions

We assume you have at least some minimal web programming experi-

ence. Dojo builds on top of standards-based technologies, most notably,

(X)HTML, CSS, DOM, and JavaScript. Although we’ll often provide a

few orienting remarks on an underlying technology when discussing

a particular Dojo functional area, we will not attempt to teach these

technologies—that’s at least four more books! In case you are fairly

new to all of this, here are some recommendations:

• Yahoo h as published an excellent set of lectures about JavaScript

and DOM programming by Douglas Crockford.

• The canonical JavaScript reference is JavaScript: The Deﬁnitive

Guide [

Fla06]. It also includes a very good DOM tutorial and ref-

erence.

• CSS is often arcane and obtuse. Cascading Style Sheets: The Deﬁn-

itive Guide [Mey06] makes a good attempt, but there are several

other references with different str engths and weaknesses.

• On the other hand, HTML is fairly simple to grasp. HTML and

XHTML: The Deﬁnitive Guide [MK08] is a nice reference, but any

number of free, online references are also probably sufﬁcient.

JavaScript i s a great language. Contrary to popular—and very mis-

informed—belief, it is closer to Lisp than BASIC. It allows you to express

very powerful ideas quickly and with elegance. Dojo pushes JavaScript

hard; so will we.

The Example Code

We’ve constructed real, working examples throughout the book. We’ve

tried to ﬁnd a good balance between including enough code in line with

the narrative so that you can understand the code but not so much that

the ﬂow is interrupted with pages of code. If you ﬁnd th at a particular

code fragment is missing some detail that you ﬁnd perplexing, you can

ﬁnd the complete working examples online at

http://www.pragprog.com/

titles/rgdojo/source_code.

5. http://yuiblog.com/blog/2007/01/24/video-crockford-tjpl, http://yuiblog.com/blog/2006/11/27/video-crockford-advjs/,

and

http://yuiblog.com/blog/2006/10/20/video-crockford-domtheory/

ACKNOWLEDGMENTS 17

Debugging

Web programming is a very dynamic activity. Typically, you’ll write a few

lines, hi t Ref resh in your browser, and see what happens. Still, a good

debugging environment is critical to maximize programmer efﬁciency.

Since Firefox + Firebug are among the best options (and they’re free!),

we use them in the narrative. If you’re using something other than

Firefox (for example, Internet Explorer), then you probably already have

a good debugging environment scoped out. If not, Dojo includes the

Firebug Lite console th at you can use with any browser. See the Alex

Says. . . , on page

79 for more debugging advice from Alex.

The Plan

The book is divided into four parts. Part I demonstrates how Dojo helps

you build power ful apps quickly and easily. These chapters include

complete details on the examples they present, but they intentionally

do not dissect the areas of Dojo they touch. Part II gives an ext en-

sive exploration of Dojo Core—the foundation upon which all things

Dojo are built. Part III covers Dijit, the Dojo widget system, and Part IV

demonstrates how to construct a Rich Internet Application.

1.3 Acknowledgments

Above all, the three of us would like to recognize and thank the Dojo

contributors. Without such a dedicated and truly talented community

Dojo simply wouldn’t be. We hope this book reﬂects well upon their her-

culean ef forts. We also owe special thanks to Bill Keese, Adam Peller,

Ian Dees, and Brian Reeve for taking the time to read and cr i tique the

manuscript. Nearly every page includes improvements recommended

by these experts. Finally, a tip of the hat to the folks at Pragmatic

Programmers—clearly a publisher by programmers for pr ogrammers.

Thanks for giving us the opportunity and all of the support along the

way. —R aw l d, Craig, and Alex

I would like to especially thank my coauthors, Craig and Alex, and the

development editor, Jackie. What a wonderful set of people to work

with, each highly skilled i n completely diff erent ways, all helping me

get out a better product. —Rawld

At the risk of sounding like a long Academy Awards speech, I would

like to thank my writing teachers Carolyn Goodwin, James Alsop, Gerry

Shapiro, and Judith Sornberger. They encouraged me t o keep writing,

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