MediaWiki:Common.js

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mw.loader.using('jquery', function () {
    $(function () {
        // Select top-level sidebar items with submenus
        $('.vector-menu-portal .vector-menu-content-list > li').each(function () {
            var $item = $(this);
            var $subMenu = $item.children('ul');

            if ($subMenu.length) {
                $item.addClass('collapsible-header');
                $subMenu.hide(); // Hide by default

                // Click to toggle submenu
                $item.on('click', function (e) {
                    // Prevent links in submenu from triggering collapse
                    if (e.target.tagName !== 'A') {
                        e.preventDefault();
                        $item.toggleClass('open');
                        $subMenu.slideToggle(200);
                    }
                });
            }
        });
    });
});