jQuery makes it easy to build interactive websites and applications. As rich and powerful as it is, however, it can't do everything, so numerous extension points have been provided that allow additional functionality to be integrated into the normal jQuery processing. Extending jQuery shows how to build custom extensions to the jQuery library. It teaches how to write plugins by providing guidelines and techniques to make use of all the extension points within jQuery. Readers will learn how to design plugins for maximum reuse and learn how to write new widgets and effects for jQuery UI. They'll also explore extensions in key areas including Ajax, events, animation, and validation. * Covers all the extension points within jQuery * Provides best practice guidelines and techniques * Connect with a thriving third-party plugin community Intermediate-level knowledge of JQuery and JavaScript needed. No experience writing plugins or other extensions is required. JavaScript is the driving force behind the Web 2.0 experience. jQuery is the most popular JavaScript library on the internet and it allows developers to more easily interact with the elements appearing on a Web page.