There arent any AJAX related gems, as far as I am aware. If you are referring to AJAX calls in Rails, they are usually done via helpers, which are ruby methods, like link_to_remote, etc.
As far as I remember, I didn't cover any AJAX in the book. In fact, I don't think there's even any Javascript, but I'd have to check. (There's a decent amount of HTML, though, both static and dynamic - rails, camping, and markaby, have chapters of their own as well as being used in a number of other gem chapters.)
Take it easy,
Dave
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