Ajax is no longer an experimental approach to website development, but the key to building browser-based applications that form the cornerstone of Web 2.0. Head First Ajax gives you an up-to-date perspective that lets you see exactly what you can do -- and has been done -- with Ajax. With it, you get a highly practical, in-depth, and mature view of what is now a mature development approach.

Using the unique and highly effective visual format that has turned Head First titles into runaway bestsellers, this book offers a big picture overview to introduce Ajax, and then explores the use of individual Ajax components -- including the JavaScript event model, DOM, XML, JSON, and more -- as it progresses. You'll find plenty of sample applications that illustrate the concepts, along with exercises, quizzes, and other interactive features to help you retain what you've learned.

Head First Ajax covers:

• The JavaScript event model
• Making Ajax requests with XMLHTTPREQUEST objects
• The asynchronous application model
• The Document Object Model (DOM)
• Manipulating the DOM in JavaScript
• Controlling the browser with the Browser Object Model
• XHTML Forms
• POST Requests
• XML Syntax and the XML DOM tree
• XML Requests & Responses
• JSON -- an alternative to XML
• Ajax architecture & patterns
• The Prototype Library

The book also discusses the server-side implications of building Ajax applications, and uses a "black box" approach to server-side components.

Head First Ajax is the ideal guide for experienced web developers comfortable with scripting -- particularly those who have completed the exercises in Head First JavaScript -- and for experienced programmers in Java, PHP, and C# who want to learn client-side programming.

Is Ajax a new technology, or the same old stuff web developers have been using for years? Both, actually. This book demonstrates not only how tried-and-true web standards make Ajax possible, but how these older technologies allow you to give sites a decidedly modern Web 2.0 feel.

Ajax: The Definitive Guide explains how to use standards like JavaScript, XML, CSS, and XHTML, along with the XMLHttpRequest object, to build browser-based web applications that function like desktop programs. You get a complete background on what goes into today's web sites and applications, and learn to leverage these tools along with Ajax for advanced browser searching, web services, mashups, and more. You discover how to turn a web browser and web site into a true application, and why developing with Ajax is faster, easier and cheaper.

The book also explains:

• How to connect server-side backend components to user interfaces in the browser
• Loading and manipulating XML documents, and how to replace XML with JSON
• Manipulating the Document Object Model (DOM)
• Designing Ajax interfaces for usability, functionality, visualization, and accessibility
• Site navigation layout, including issues with Ajax and the browser's back button
• Adding life to tables & lists, navigation boxes and windows
• Animation creation, interactive forms, and data validation
• Search, web services and mash-ups
• Applying Ajax to business communications, and creating Internet games without plug-ins
• The advantages of modular coding, ways to optimize Ajax applications, and more

Of all the Ajax-specific frameworks that have popped up in recent years, one clearly stands out as the industrial strength solution. Dojo is not just another JavaScript toolkit -- it's the JavaScript toolkit -- and Dojo: The Definitive Guide demonstrates how to tame Dojo's extensive library of utilities so that you can build rich and responsive web applications like never before. Dojo founder Alex Russell gives a foreword that explains the "why" of Dojo and of this book.

Dojo provides an end-to-end solution for development in the browser, including everything from the core JavaScript library and turnkey widgets to build tools and a testing framework. Its vibrant open source community keeps adding to Dojo's arsenal, and this book provides an ideal companion to Dojo's official documentation.

Dojo: the Definitive Guide gives you the most thorough overview of this toolkit available, showing you everything from how to create complex layouts and form controls closely resembling those found in the most advanced desktop applications with stock widgets, to advanced JavaScript idioms to AJAX and advanced communication transports. With this definitive reference you get:

• Get a concise introduction to Dojo that's good for all 1.x versions
• Well-explained examples, with scores of tested code samples, that let you see Dojo in action
• A comprehensive reference to Dojo's standard JavaScript library (including fundamental utilities in Base, Dojo's tiny but powerful kernel) that you'll wonder how you ever lived without
• An extensive look at additional Core features, such as animations, drag-and-drop, back-button handling, animations like wipe and slide, and more
• Exhaustive coverage of out-of-the-box Dijits (Dojo widgets) as well as definitive coverage on how to create your own, either from scratch or building on existing ones
• An itemized inventory of DojoX subprojects, the build tools, and the DOH, Dojo's unit-testing framework that you can use with Dojo -- or anywhere else

If you're a DHTML-toting web developer, you need to read this book -- whether you're a one-person operation or part of an organization employing scores of developers. Dojo packs the standard JavaScript library you've always wanted, and Dojo: The Definitive Guide helps you transform your ideas into working applications quickly by leveraging design concepts you already know.