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This Fifth Edition is completely revised and expanded to cover JavaScript as it is used in today's Web 2.0 applications. This book is both an example-driven programmer's guide and a keep-on-your-desk reference, with new chapters that explain everything you need to know to get the most out of JavaScript, including:

• Scripted HTTP and Ajax
• XML processing
• Client-side graphics using the canvas tag
• Namespaces in JavaScript--essential when writing complex programs
• Classes, closures, persistence, Flash, and JavaScript embedded in Java applications

Part I explains the core JavaScript language in detail. If you are new to JavaScript, it will teach you the language. If you are already a JavaScript programmer, Part I will sharpen your skills and deepen your understanding of the language.

Part II explains the scripting environment provided by web browsers, with a focus on DOM scripting with unobtrusive JavaScript. The broad and deep coverage of client-side JavaScript is illustrated with many sophisticated examples that demonstrate how to:

• Generate a table of contents for an HTML document
• Display DHTML animations
• Automate form validation
• Draw dynamic pie charts
• Make HTML elements draggable
• Define keyboard shortcuts for web applications
• Create Ajax-enabled tool tips
• Use XPath and XSLT on XML documents loaded with Ajax
• And much more

Part III is a complete reference for core JavaScript. It documents every class, object, constructor, method, function, property, and constant defined by JavaScript 1.5 and ECMAScript Version 3.

Part IV is a reference for client-side JavaScript, covering legacy web browser APIs, the standard Level 2 DOM API, and emerging standards such as the XMLHttpRequest object and the canvas tag.

More than 300,000 JavaScript programmers around the world have made this their indispensable reference book for building JavaScript applications.

"A must-have reference for expert JavaScript programmers...well-organized and detailed."
-- Brendan Eich, creator of JavaScript

Most programming languages contain good and bad parts, but JavaScript has more than its share of the bad, having been developed and released in a hurry before it could be refined. This authoritative book scrapes away these bad features to reveal a subset of JavaScript that's more reliable, readable, and maintainable than the language as a whole-a subset you can use to create truly extensible and efficient code.

Considered the JavaScript expert by many people in the development community, author Douglas Crockford identifies the abundance of good ideas that make JavaScript an outstanding object-oriented programming language-ideas such as functions, loose typing, dynamic objects, and an expressive object literal notation. Unfortunately, these good ideas are mixed in with bad and downright awful ideas, like a programming model based on global variables.

When Java applets failed, JavaScript became the language of the Web by default, making its popularity almost completely independent of its qualities as a programming language. In JavaScript: The Good Parts, Crockford finally digs through the steaming pile of good intentions and blunders to give you a detailed look at all the genuinely elegant parts of JavaScript, including:

• Syntax
• Objects
• Functions
• Inheritance
• Arrays
• Regular expressions
• Methods
• Style
• Beautiful features

The real beauty? As you move ahead with the subset of JavaScript that this book presents, you'll also sidestep the need to unlearn all the bad parts. Of course, if you want to find out more about the bad parts and how to use them badly, simply consult any other JavaScript book.

With JavaScript: The Good Parts, you'll discover a beautiful, elegant, lightweight and highly expressive language that lets you create effective code, whether you're managing object libraries or just trying to get Ajax to run fast. If you develop sites or applications for the Web, this book is an absolute must.

So you're ready to make the leap from writing HTML and CSS web pages to creating dynamic web applications. You want to take your web skills to the next level. And you're finally ready to add "programmer" to the resume. It sounds like you're ready to learn the Web's hottest programming language: JavaScript. Head First JavaScript is your ticket to going beyond copying and pasting the code from someone else's web site, and writing your own interactive web pages.

With Head First JavaScript, you learn:

• The basics of programming, from variables to types to looping
• How the web browser runs your code, and how you can talk to the browser with your code
• Why you'll never have to worry about casting, overloading, or polymorphism when you're writing JavaScript code
• How to use the Document Object Model to change your web pages without making your users click buttons

If you're new to JavaScript, or an experienced web developer looking to improve your skills, Learning JavaScript provides you with complete, no-nonsense coverage of this quirky yet essential language for web development. You'll learn everything from primitive data types to complex features, including JavaScript elements involved with Ajax and dynamic page effects. By the end of the book, you'll be able to work with even the most sophisticated libraries and web applications.

Complete with best practices and examples of JavaScript use, this new edition shows you how to integrate the language with the browser environment, and how to practice proper coding techniques for standards-compliant websites. This book will help you:

• Learn the JavaScript application structure, including basic statements and control structures
• Identify JavaScript objects -- String, Number, Boolean, Function, and more
• Use browser debugging tools and troubleshooting techniques
• Understand event handling, form events, and JavaScript applications with forms
• Develop with the Browser Object Model, the Document Object Model, and custom objects you create
• Learn about browser cookies and more modern client-side storage techniques
• Get details for using XML or JSON with Ajax applications

JavaScript is an essential language for creating modern, interactive websites, but its complex rules challenge even the most experienced web designers. With JavaScript: The Missing Manual, you'll quickly learn how to use JavaScript in sophisticated ways -- without pain or frustration -- even if you have little or no programming experience.

JavaScript expert David McFarland first teaches you the basics by having you build a simple program. Then you'll learn how to work with jQuery, a popular library of pre-built JavaScript components that's free and easy to use. With jQuery, you can quickly build modern, interactive web pages -- without having to script everything from scratch!

• Learn how to add scripts to a web page, store and manipulate information, communicate with the browser window, respond to events like mouse clicks and form submissions, and identify and modify HTML
• Get real-world examples of JavaScript in action
• Learn to build pop-up navigation bars, enhance HTML tables, create an interactive photo gallery, and make web forms more usable
• Create interesting user interfaces with tabbed panels, accordion panels, and pop-up dialog boxes
• Learn to avoid the ten most common errors new programmers make, and how to find and fix bugs
• Use JavaScript with Ajax to communicate with a server so that your web pages can receive information without having to reload

What's the best approach for developing an application with JavaScript? This book helps you answer that question with numerous JavaScript coding patterns and best practices. If you're an experienced developer looking to solve problems related to objects, functions, inheritance, and other language-specific categories, the abstractions and code templates in this guide are ideal -- whether you're writing a client-side, server-side, or desktop application with JavaScript.

Written by JavaScript expert Stoyan Stefanov -- Senior Yahoo! Technical and architect of YSlow 2.0, the web page performance optimization tool -- JavaScript Patterns includes practical advice for implementing each pattern discussed, along with several hands-on examples. You'll also learn about anti-patterns: common programming approaches that cause more problems than they solve.

• Explore useful habits for writing high-quality JavaScript code, such as avoiding globals, using single var declarations, and more
• Learn why literal notation patterns are simpler alternatives to constructor functions
• Discover different ways to define a function in JavaScript
• Create objects that go beyond the basic patterns of using object literals and constructor functions
• Learn the options available for code reuse and inheritance in JavaScript
• Study sample JavaScript approaches to common design patterns such as Singleton, Factory, Decorator, and more
• Examine patterns that apply specifically to the client-side browser environment

If you're like most developers, you rely heavily on JavaScript to build interactive and quick-responding web applications. The problem is that all of those lines of JavaScript code can slow down your apps. This book reveals techniques and strategies to help you eliminate performance bottlenecks during development. You'll learn how to improve execution time, downloading, interaction with the DOM, page life cycle, and more.

Yahoo! frontend engineer Nicholas C. Zakas and five other JavaScript experts -- Ross Harmes, Julien Lecomte, Steven Levithan, Stoyan Stefanov, and Matt Sweeney -- demonstrate optimal ways to load code onto a page, and offer programming tips to help your JavaScript run as efficiently and quickly as possible. You'll learn the best practices to build and deploy your files to a production environment, and tools that can help you find problems once your site goes live.

• Identify problem code and use faster alternatives to accomplish the same task
• Improve scripts by learning how JavaScript stores and accesses data
• Implement JavaScript code so that it doesn't slow down interaction with the DOM
• Use optimization techniques to improve runtime performance
• Learn ways to ensure the UI is responsive at all times
• Achieve faster client-server communication
• Use a build system to minify files, and HTTP compression to deliver them to the browser