If you're a web developer with previous javascript and DOM scripting experience, Pro DOM Scripting with Ajax, APIs, and Libraries is perfect for you to take your knowledge up to the next level. It provides a thorough walkthrough of all the fundamentals needed to build effective dynamic web applications.
The first part of the book focuses on methodology and technologies for rapid development with javascript, including OOP and events, but also Ajax frameworks and javascript libraries. The second part includes three complete projects for you to learn from: form validation, mashups, and UI design.