CommonJsAfterAjax

function addXMLRequestCallback() {                                     
      var oldSend, oldonreadystatechange;
      /*saving the orginal method*/
      oldSend = XMLHttpRequest.prototype.send;
      /*overrideing the default behaviour*/
      XMLHttpRequest.prototype.send = function() {               
          /*calling the default behaviour*/
          oldSend.apply(this, arguments);
          oldonreadystatechange = this.onreadystatechange;
          this.onreadystatechange = function ( progress ) {
             oldonreadystatechange(progress);                       
             onFinshAjaxRequest();
          };       
      }
}                              
function onFinshAjaxRequest(){
  //code which needs to be executed once the the ajax request is completed.
  /*************************************/
  /******HERE GOES YOUR JS CODE*********/
  /*************************************/
}