Topics
Ajax/JavaScript libraries in Rails
PrototypeHelper
ScriptaculousHelper
JavaScriptMacrosHelper
JavaScript related utility methods
Ruby JavaScript template

Ajax/JavaScript Libraries in Rails
• Prototype – used mainly for Ajax
> ActionView::Helpers::PrototypeHelper
• Scriptaculous – used mainly for visual effects, drag and drop, auto-completion
> ActionView::Helpers::ScriptaculousHelper
• JavaScript related utility methods
> ActionView::Helpers::JavaScriptHelper
• Others can be easily added

How to Include Ajax?JavaScript Libraries
• Option 1: Use <%= javascript_include_tag :defaults %> in the HEAD section of your page (recommended):
> Return references to the JavaScript files in your public/javascripts directory.
> Recommended as the browser can then cache the libraries instead of fetching all the functions anew on every request.
• Option 2: Use <%= javascript_include_tag ‘prototype’ %>
> Will only include the Prototype core library
• Option 3: Use <%= define_javascript_functions %>
> Will copy all the JavaScript support functions within a single script block. Not recommended.

SEE MORE DETAILS VIA Download the PDF stuff.