(function() { const itemSelector = "#main-nav .menu-item"; const activeClass = 'active-menu-item'; document.querySelectorAll(itemSelector).forEach(el=>{ el.onclick = function(e) { let wasActive = this.classList.contains(activeClass); document.querySelectorAll(itemSelector + "." + activeClass).forEach(active => active.classList.remove(activeClass)); if (!wasActive) this.classList.add(activeClass); } }); })();