A review of the Form API properties that provide interactive user interface elements by automatically adding JavaScript behaviors to the form elements.
Goes through how to implement the AHAH framework in Drupal 6 in order to provide more dynamic interactions on a Drupal form.
See how the new JavaScript APIs and ajax framework in Drupal 7 allows you to implement dynamic behaviors without having to register a menu callback in the menu system or to write any jQuery code.
Create dependencies between form elements so that you can show/hide or disable/enable one form setting based upon the form state of another from setting.
Go on a brief tour of other jQuery and JavaScript-related contributed modules that are worth knowing about.
Jquery Overview
FreeProvides a high-level overview of jQuery to people who are brand new to this JavaScript library.