// (function waitForJQueryAndRun() if (typeof window.$ === function) // jQuery is loaded, run your code $(function() $(document).on(shown.bs.dropdown, .custom-header-menu div.menu.upper li.dropdown, function(e) var $dropdown = $(this); var $anchor = $dropdown.find(a[data-toggle=dropdown], a.dropdown-toggle).first(); var $menuPopover = $dropdown.children(ul.dropdown-menu).first(); if ($menuPopover.length && $anchor.length) // Focus the first focusable element when menu opens var focusableEls = $menuPopover.find(a[href], button:not([disabled]), [tabindex]:not([tabindex=-1])).filter(:visible); var first = focusableEls.first()[0]; if (first) first.focus(); $menuPopover.on(keydown.dropdown-navigation, function (e) // Only trap focus if menu is open if ($anchor.attr(aria-expanded) === true) if (e.key === Escape || e.key === Tab) $anchor.attr(aria-expanded, false); $dropdown.removeClass(open); $anchor.focus(); ); ); // Clean up event handlers when dropdown closes $(document).on(hidden.bs.dropdown, .custom-header-menu div.menu.upper li.dropdown, function(e) var $dropdown = $(this); var $menuPopover = $dropdown.children(ul.dropdown-menu).first(); $menuPopover.off(keydown.dropdown-navigation); ); ); else // jQuery not loaded yet, try again soon setTimeout(waitForJQueryAndRun, 50); )(); //