gistfile1.js

// before:

function ajax(obj, options, errorMessage, ajaxOptions) {
  options = $.extend({successStatus: 200}, options);
  errorMessage = errorMessage || "Unknown error";

  $.ajax($.extend($.extend({
    type: "GET", dataType: "json",
    complete: function(req) {
      var resp = $.httpData(req, "json");
      if (req.status == options.successStatus) {
        if (options.success) options.success(resp);
      } else if (options.error) {
        options.error(req.status, resp.error, resp.reason);
      } else {
        alert(errorMessage + ": " + resp.reason);
      }
    }
  }, obj), ajaxOptions));
}


// after:

function ajax(obj, options, errorMessage, ajaxOptions) {
  options = $.extend({successStatus: 200}, options);
  errorMessage = errorMessage || "Unknown error";

  $.ajax($.extend($.extend({
    type: "GET", dataType: "json",
    complete: function(req) {
      var resp = $.httpData(req, "json");
      if (options.ajaxStart) {
        options.ajaxStart(resp);
      }
      if (req.status == options.successStatus) {
        if (options.success) options.success(resp, obj);
      } else if (options.error) {
        options.error(req.status, resp.error, resp.reason);
      } else {
        alert(errorMessage + ": " + resp.reason);
      }
    }
  }, obj), ajaxOptions));
}