Using this codebase
You can get the original codebase either from the book’s homepage, as an archive file, or using its Github repository.
This codebase is the official jQuery variant. I (Christophe, the book’s author) created it myself immediately after creating the original repository, but it's not adapted yet, and even when it is, it likely won't be entirely idiomatic, jQuery-wise, so I'll get a few top-notch contributors to smooth it in.
All necessary files are present and most files can be run locally in your web browser. A few files use a tiny PHP backend to simulate processing times or demonstrate server-related stuff like Ajax, JSON-P and the like, so you may need to run these through an HTTP server on your machine.
The entire original (Prototype-based) codebase is also accessible through a couple domain names; the reason for multiple domain names is to help demonstrate cross-domain “Ajax” requests. The domains are:
The codebase contains a number of pure-JS, no-framework items for the bread-and-butter tasks. Then it relies heavily on a well-known library. Except for the lightbox task, where I went with the jQuery-based Fancybox plugin, the original codebase relies on Prototype everywhere else.
Many people will prefer jQuery, or MooTools, or YUI, or Dojo, or what-have-you. In order to accomodate this need, I put the codebase on Github to facilitate people forking it towards a version relying on another framework than Prototype. You’re right now looking at the jQuery variant of it.
So check out the README.md of the original codebase to find your flavor, and if it doesn't exist yet, be bold and fork away!