Added navbar options (#906)

assets/js/dropdown.js

@@ -0,0 +1,81 @@
+(function () {
+    const mediaQuery = window.matchMedia('(max-width: 991px)');
+
+    const menu = document.querySelector('.gh-head-menu');
+    const nav = menu.querySelector('.nav');
+    if (!nav) return;
+
+    const logo = document.querySelector('.gh-head-logo');
+    const navHTML = nav.innerHTML;
+
+    if (mediaQuery.matches) {
+        const items = nav.querySelectorAll('li');
+        items.forEach(function (item, index) {
+            item.style.transitionDelay = 0.03 * (index + 1) + 's';
+        });
+    }
+
+    const makeDropdown = function () {
+        if (mediaQuery.matches) return;
+        const submenuItems = [];
+
+        while ((nav.offsetWidth + 64) > menu.offsetWidth) {
+            if (nav.lastElementChild) {
+                submenuItems.unshift(nav.lastElementChild);
+                nav.lastElementChild.remove();
+            } else {
+                return;
+            }
+        }
+
+        if (!submenuItems.length) {
+            document.body.classList.add('is-dropdown-loaded');
+            return;
+        }
+
+        const toggle = document.createElement('button');
+        toggle.setAttribute('class', 'nav-more-toggle');
+        toggle.setAttribute('aria-label', 'More');
+        toggle.innerHTML = '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 32 32" fill="currentColor"><path d="M21.333 16c0-1.473 1.194-2.667 2.667-2.667v0c1.473 0 2.667 1.194 2.667 2.667v0c0 1.473-1.194 2.667-2.667 2.667v0c-1.473 0-2.667-1.194-2.667-2.667v0zM13.333 16c0-1.473 1.194-2.667 2.667-2.667v0c1.473 0 2.667 1.194 2.667 2.667v0c0 1.473-1.194 2.667-2.667 2.667v0c-1.473 0-2.667-1.194-2.667-2.667v0zM5.333 16c0-1.473 1.194-2.667 2.667-2.667v0c1.473 0 2.667 1.194 2.667 2.667v0c0 1.473-1.194 2.667-2.667 2.667v0c-1.473 0-2.667-1.194-2.667-2.667v0z"></path></svg>';
+
+        const wrapper = document.createElement('div');
+        wrapper.setAttribute('class', 'gh-dropdown');
+
+        if (submenuItems.length >= 10) {
+            document.body.classList.add('is-dropdown-mega');
+            wrapper.style.gridTemplateRows = 'repeat(' + Math.ceil(submenuItems.length / 2) + ', 1fr)';
+        } else {
+            document.body.classList.remove('is-dropdown-mega');
+        }
+
+        submenuItems.forEach(function (child) {
+            wrapper.appendChild(child);
+        });
+
+        toggle.appendChild(wrapper);
+        nav.appendChild(toggle);
+
+        document.body.classList.add('is-dropdown-loaded');
+
+        toggle.addEventListener('click', function () {
+            document.body.classList.toggle('is-dropdown-open');
+        });
+
+        window.addEventListener('click', function (e) {
+            if (!toggle.contains(e.target) && document.body.classList.contains('is-dropdown-open')) {
+                document.body.classList.remove('is-dropdown-open');
+            }
+        });
+    }
+
+    imagesLoaded(logo, function () {
+        makeDropdown();
+    });
+
+    window.addEventListener('resize', function () {
+        setTimeout(function () {
+            nav.innerHTML = navHTML;
+            makeDropdown();
+        }, 1);
+    });
+})();