我有一个菜单，但当我转到子菜单页面时，该子菜单的父菜单不会突出显示。如何做到这一点？
如果没有子菜单，它可以正常工作：
我的菜单结构是：
<nav class="x-nav-wrap desktop" role="navigation">
<ul id="menu-x-demo-menu" class="partial-refreshable-nav-menu partial-refreshable-nav-menu-1 x-nav">
<li id="menu-item-224" class="menu-item menu-item-type-taxonomy menu-item-object-category menu-item-224 tax-item tax-item-1"><a href="http://serwer1475046.home.pl/pstrony/vocal/index.php/category/newsy/"><span>Newsy</span></a></li>
<li id="menu-item-5" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-5"><a href="http://serwer1475046.home.pl/pstrony/vocal/"><span>O nas</span></a></li>
<li id="menu-item-197" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-has-children menu-item-197"><a href="#"><span>Dorośli</span></a>
<ul class="sub-menu">
<li id="menu-item-200" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-200"><a href="http://serwer1475046.home.pl/pstrony/vocal/index.php/o-szkole/"><span>O szkole</span></a></li>
<li id="menu-item-310" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-310"><a href="http://serwer1475046.home.pl/pstrony/vocal/index.php/program-ksztalcenia-dorosli-dorosli/"><span>Program kształcenia i opłaty</span></a></li>
<li id="menu-item-202" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-202"><a href="http://serwer1475046.home.pl/pstrony/vocal/index.php/rekrutacja/"><span>Rekrutacja</span></a></li>
<li id="menu-item-199" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-199"><a href="http://serwer1475046.home.pl/pstrony/vocal/index.php/kadra/"><span>Kadra</span></a></li>
<li id="menu-item-279" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-279"><a href="http://serwer1475046.home.pl/pstrony/vocal/index.php/galeria-dorosli-i-mlodziez/"><span>Galeria</span></a></li>
</ul>
</li>
<li id="menu-item-208" class="menu-item menu-item-type-custom menu-item-object-custom current-menu-ancestor current-menu-parent menu-item-has-children menu-item-208"><a href="#"><span>Młodzież</span></a>
<ul class="sub-menu">
<li id="menu-item-205" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-205"><a href="http://serwer1475046.home.pl/pstrony/vocal/index.php/o-szkole-mlodziez/"><span>O szkole</span></a></li>
<li id="menu-item-206" class="menu-item menu-item-type-post_type menu-item-object-page current-menu-item page_item page-item-81 current_page_item menu-item-206"><a href="http://serwer1475046.home.pl/pstrony/vocal/index.php/program-ksztalcenia-dorosli/"><span>Program kształcenia i opłaty</span></a></li>
<li id="menu-item-207" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-207"><a href="http://serwer1475046.home.pl/pstrony/vocal/index.php/rekrutacja/"><span>Rekrutacja</span></a></li>
<li id="menu-item-204" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-204"><a href="http://serwer1475046.home.pl/pstrony/vocal/index.php/kadra/"><span>Kadra</span></a></li>
<li id="menu-item-278" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-278"><a href="http://serwer1475046.home.pl/pstrony/vocal/index.php/galeria-dorosli-i-mlodziez/"><span>Galeria</span></a></li>
</ul>
</li>
<li id="menu-item-321" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-has-children menu-item-321"><a href="#"><span>Dzieci</span></a>
<ul class="sub-menu">
<li id="menu-item-65" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-65"><a href="http://serwer1475046.home.pl/pstrony/vocal/index.php/dzieci/"><span>O szkole</span></a></li>
<li id="menu-item-337" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-337"><a href="http://serwer1475046.home.pl/pstrony/vocal/index.php/program-ksztalcenia-dzieci/"><span>Program kształcenia</span></a></li>
<li id="menu-item-342" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-342"><a href="http://serwer1475046.home.pl/pstrony/vocal/index.php/rekrutacja-dzieci/"><span>Rekrutacja</span></a></li>
<li id="menu-item-273" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-273"><a href="http://serwer1475046.home.pl/pstrony/vocal/index.php/kadra/"><span>Kadra</span></a></li>
<li id="menu-item-343" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-343"><a href="http://serwer1475046.home.pl/pstrony/vocal/index.php/galeria-dzieci/"><span>Galeria</span></a></li>
</ul>
</li>
<li id="menu-item-280" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-has-children menu-item-280"><a href="http://serwer1475046.home.pl/pstrony/vocal/index.php/galeria-dorosli-i-mlodziez/"><span>Galeria</span></a>
<ul class="sub-menu">
<li id="menu-item-263" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-263"><a href="http://serwer1475046.home.pl/pstrony/vocal/index.php/galeria-dorosli-i-mlodziez/"><span>Dorośli i Młodzież</span></a></li>
<li id="menu-item-264" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-264"><a href="http://serwer1475046.home.pl/pstrony/vocal/index.php/galeria-dzieci/"><span>Dzieci</span></a></li>
</ul>
</li>
<li id="menu-item-69" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-69"><a href="http://serwer1475046.home.pl/pstrony/vocal/index.php/szkolenia/"><span>Seniorzy</span></a></li>
<li id="menu-item-67" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-67"><a href="http://serwer1475046.home.pl/pstrony/vocal/index.php/kontakt/"><span>Kontakt</span></a></li>
<li class="menu-item x-menu-item x-menu-item-search"><a href="#" class="x-btn-navbar-search"><span><i class="x-icon-search" data-x-icon="" aria-hidden="true"></i><span class="x-hidden-desktop"> Search</span></span></a></li>
</ul>
</nav>
