Support ajax callbacks for specific status codes

[nbubna]

From this thread: ​http://groups.google.com/group/jquery-dev/browse_thread/thread/41be75884cc2aead

It would be nice to be able to specify callbacks to handle specific status codes. Supporting this would make extending $.ajax behavior more difficult (for things like ​http://plugins.jquery.com/project/rest). So, along with this, it would be nice to support a 'ready' callback that would be called once the XHR is done and before any other callbacks are executed.

I've attached a patch to support both.

[nbubna]

Suggested implementation

[nbubna]

Suggested implementation

[nbubna]

Just attached an updated patch with proper tabs, proper brace style and the correct success/status handler.

[jaubourg]

Fixes #4964. Adds a statusCode object together with a new statusCode method on the jXHR object (deferred behaviour). They accept a map of statusCode/callback(s). Callbacks are fired when the status code of the response correponds to the key (as a success or an error callback depending on how the request completed). Unit tests added.

Changeset: 44fc87f66ca54278e37f15885a80c2407036df57