Run queued AJAX requests

ajax_queue.js

$(function () {
  //setup an array of AJAX options, each object is an index that will specify information for a single AJAX request
  var ajaxes  = [{ url : '<url>', dataType : 'json' }, { url : '<url2>', dataType : 'xml' }],
      current = 0;

  //declare your function to run AJAX requests
  function do_ajax() {
    
      //check to make sure there are more requests to make
      if (current < ajaxes.length) {
        
          //make the AJAX request with the given data from the `ajaxes` array of objects
          $.ajax({
              url      : ajaxes[current].url,
              dataType : ajaxes[current].dataType,
              success  : function (serverResponse) {
                  // ...
                  //increment the `current` counter and recursively call this function again
                  current++;
                  do_ajax();
              }
          });
      }
  }

  //run the AJAX function for the first time once `document.ready` fires
  do_ajax();
});