(function($) {
      var boostrap_script = document.createElement('script');
      boostrap_script.setAttribute('src','https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js');

      var bootstrap_enabled = (typeof $.fn.modal == 'function');
        if(!bootstrap_enabled) {
          $(window).load(function(){
              document.head.appendChild(boostrap_script);
          });
        }
})(jQuery);