This second edition updates the first edition to include the latest versions of all web browsers as well as introducing newer techniques and related technologies such as canvas, E4X, and JavaScript 2.0. The book sets the stage by covering JavaScript in HTML then explores the core of JavaScript, ECMAScript, to give the reader and understanding of the language's basic syntax, data types, statements, and memory management. Readers will learn about object-oriented programming in JavaScript, including defining their own objects and implementing JavaScript's innovative form of inheritance. The book discusses the Document Object Model (DOM) and the Browser Object Model, explaining how these can be used to alter the user's experience. All three levels of the Document Object Model are explained, including advanced topics such as event simulation, XML parsing, and Xpath queries. The book intermixes with this discussion about XML and XSLT. The last section of the book covers error handling and debugging, design patterns, and best practices for a variety of topics including performance and security. · What Is JavaScript? · JavaScript in HTML · Language Basics · Variables, Scope, and Memory · Reference Types · Object-Oriented Programming · Anonymous Functions · The Browser Object Model · Client Detection · The Document Object Model · DOM Levels 2 and 3 · Events · Scripting Forms · Error Handling and Debugging · XML in JavaScript · ECMAScript for XML · Ajax and JSON · Advanced Techniques · Client-Side Storage · Best Practices · Upcoming APIs · The Evolution of JavaScript