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static/js/menu.js

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+const container = document.querySelector(".container");
+const allMenus = document.querySelectorAll(".menu");
+
+// Hide menus on body click
+document.body.addEventListener("click", () => {
+  allMenus.forEach(menu => {
+    if (menu.classList.contains("open")) {
+      menu.classList.remove("open");
+    }
+  });
+});
+
+// Reset menus on resize
+window.addEventListener("resize", () => {
+  allMenus.forEach(menu => {
+    menu.classList.remove("open");
+  });
+});
+
+// Handle desktop menu
+allMenus.forEach(menu => {
+  const trigger = menu.querySelector(".menu__trigger");
+  const dropdown = menu.querySelector(".menu__dropdown");
+
+  trigger.addEventListener("click", e => {
+    e.stopPropagation();
+
+    if (menu.classList.contains("open")) {
+      menu.classList.remove("open");
+    } else {
+      // Close all menus...
+      allMenus.forEach(m => m.classList.remove("open"));
+      // ...before opening the current one
+      menu.classList.add("open");
+    }
+
+    if (dropdown.getBoundingClientRect().right > container.getBoundingClientRect().right) {
+      dropdown.style.left = "auto";
+      dropdown.style.right = 0;
+    }
+  });
+
+  dropdown.addEventListener("click", e => e.stopPropagation());
+});