$(document).ready(function () {
  $('ul.dropdown-menu [data-toggle=dropdown]').on('click', function (event) {
    event.preventDefault();
    event.stopPropagation();
    $(this).parent().addClass('open');

    var menu = $(this).parent().find("ul");
    var menupos = menu.offset();

    if ((menupos.left + menu.width()) + 30 > $(window).width()) {
      var newpos = -menu.width();
    } else {
      var newpos = $(this).parent().width();
    }
    menu.css({left: newpos});
  });
});