Rails emerged at about the same time as Ajax did, and the two technologies can work tightly together. Ajax, a set of technologies for creating much more interactive interfaces in the browser, can connect neatly to Rails’ more server-based approach. There’s much more than that, though, as the Rails framework includes a number of components designed specifically for making it easier to build Ajax applications from inside of Rails.
Ajax development is itself worth a book or even a shelf of books, depending on how you want to go about it. ...