This book focuses on teaching by example. Chapters are packed with example code, providing hands-on examples you can play with and then release to your own Drupal sites. By introducing short projects interspersed with discussion, the pace is rapid yet practical. This book is for web designers and developers who want to add JavaScript elements to Drupal themes or modules to create more flexible and responsive user interfaces. You are expected to know about the basic operation of Drupal, and be familiar with the concept of theming and modules in Drupal. No experience of creating themes or modules is required. You will need to know the basics of client-side web development; this means HTML, CSS, but also have a rudimentary grasp of the syntax of JavaScript. Familiarity with PHP programming will be an advantage, since we will be writing PHPTemplate files and (at the end) creating Drupal modules. However, the PHP is covered thoroughly enough that even the PHP neophyte will not find the text too demanding. The book also covers the jQuery JavaScript library and its use in Drupal, but no knowledge of jQuery is expected – you will learn everything you need in this book.