Открытие выпадающих списков по наведению (Bootstrap)

bootstrap_hover_dropdowns.js

function is_touch_device() {  
    try {  
        document.createEvent("TouchEvent");  
        return true;  
    } catch (e) {  
        return false;  
    }  
}
if (is_touch_device) return;
$('.pane-system-main-menu .nav .dropdown .dropdown-toggle').hover(function() {
  $('.dropdown').removeClass('open');
  $(this).parent().addClass('open');
  $(this).attr('aria-expanded', true);
});

$('.pane-system-main-menu .nav .dropdown').on('mouseleave', function(e) {
  var cursorX;
  var cursorY;
  document.onmousemove = function(e) {
    cursorX = e.pageX - window.pageXOffset;
    cursorY = e.pageY - window.pageYOffset;
  }
  var canCloseDropdown = function(dropdown) {
    var onParent = $(document.elementFromPoint(cursorX, cursorY)).parent()[0] === dropdown.parent()[0];
    var inMenu = $.contains(dropdown[0], $(document.elementFromPoint(cursorX, cursorY))[0]);
    if (!onParent && !inMenu) {
      $(dropdown).parent().removeClass('open');
      $(dropdown).parent().find('.dropdown-toggle').attr('aria-expanded', false);
    }
  }
  setTimeout(canCloseDropdown, 500, $(this).find('.dropdown-menu'));
});