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I've been going through the source to find out the critiera for jQuery.ajax()'s success/failure methods being called. It is not based solely on the status code, it seems to also involve the data type.
I always resort to writing custom error handlers using the 'complete'-callback.
Exactly which are the critera for the success/failure calls?
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AJAX success is a global event. Global events are triggered on the document to call any handlers who may be listening. The ajaxSuccess event is only called if the request is successful. It is essentially a type function that's called when a request proceeds.
jQuery - ajaxSuccess( callback ) Method The ajaxSuccess( callback ) method attaches a function to be executed whenever an AJAX request completes successfully. This is an Ajax Event.
If an AJAX request fails, you can react to the failure inside the callback function added via the fail() function of the object returned by the $. ajax() function. Here is a jQuery AJAX error handling example: var jqxhr = $.
Response is the object passed as the first argument of all Ajax requests callbacks. This is a wrapper around the native xmlHttpRequest object. It normalizes cross-browser issues while adding support for JSON via the responseJSON and headerJSON properties.
As you said, it depends on the data type, script is a special one for instance, the check is:
readyState "loaded" or "complete"?For other requests it's checks the following:
Does jQuery.httpSuccess() return true?
Is it modified? (do we care about the [not] updated result?)
Note: The above is for jQuery 1.4.3, jQuery 1.4.2 and below had an additional "success" scenario where a response code of 0 was also "successful", this was done because Opera returns a 0 when it's really a 304. This is incorrect behavior, and the jQuery team opted to drop support for this quirk, since it caused false-positives in other actual 0 response code cases.
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