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Chapter 12. Ajax on Rails > Ajax and JavaScript
12.5. Ajax and JavaScript
The primary reason you want to work with a JavaScript response to an Ajax request is when it is for JSONP (JSON with Padding). JSONP pads, or wraps, JSON data in a call to a JavaScript function that exists on your page. You specify the name of that function in a callback query string parameter. Note that some public APIs may use something other than callback, but it has become the convention in Rails 3 and most JSONP applications.
Xavier says ...
Although the Wikipedia entry[4] for Ajax does not specifically mention JSONP and the request is not XHR by Rails’ definition, we’d like to think of it as Ajax anyways - it is after all asynchronous JavaScript.
