foo

assets/js/topbar.js

@@ -0,0 +1,27 @@
+function topbarInjector() {
+    document.body.addEventListener("click", function (ev) {
+      const thisIsExpanded = ev.target.matches(".nav-expanded > .dropdown-label");
+      if (!ev.target.matches(".nav-dropdown-container")) {
+        Array.prototype.forEach.call(
+          document.getElementsByClassName("dropdown-label"),
+          function (el) {
+            el.parentElement.classList.remove("nav-expanded");
+          }
+        );
+      }
+      if (!thisIsExpanded && ev.target.matches(".dropdown-label")) {
+        ev.target.parentElement.classList.add("nav-expanded");
+      }
+    });
+  }
+
+  if (
+    document.readyState === "complete" ||
+    document.readyState === "interactive"
+  ) {
+    // call on next available tick
+    setTimeout(topbarInjector, 1);
+  } else {
+    document.addEventListener("DOMContentLoaded", topbarInjector);
+  }
+