jQuery.ajax 2xx statusCode callbacks are invoked with error-callback parameters when parsererror is raised

[karns.17@…]

Given an ajax request with json dataType and a 2xx statusCode callback, if a parsererror occurs during handling then the parameters passed to the 2xx callback are incorrect. According to the documentation, 2xx handlers receive the same parameters as the success callback. However, after a parsererror, the success callback is treated as an error callback (the parameters received match the function signature for error callbacks).

[gibson042]

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[jaubourg]

From the documentation:

If the request is successful, the status code functions take the same parameters as the success callback; if it results in an error, they take the same parameters as the error callback.

Not being able to parse the response is an error and statusCode callbacks are called no matter what (like always and complete callbacks). It's easy enough to control what state you're in from inside the callback:

{
  200: function() {
    if ( this.state() === "rejected" ) {
      // An client-side error occured
    } else {
      // Success!
    }
  }
}

If you used the context option then just keep a reference to the jqXHR in your closure.