fixing website

docs/theme/gotenberg/js/index.js

@@ -0,0 +1,46 @@
+/**
+ * Setup.
+ */
+
+const items = document.querySelectorAll('.Page')
+const links = document.querySelectorAll('.Menu a')
+
+/**
+ * Check if `el` is out out of view.
+ */
+
+function isBelowScroll(el) {
+  return el.getBoundingClientRect().bottom > 0
+}
+
+/**
+ * Activate item `i`.
+ */
+
+function activateItem(i) {
+  links.forEach(e => e.classList.remove('active'))
+  links[i].classList.add('active')
+}
+
+/**
+ * Activate the correct menu item for the
+ * contents in the viewport.
+ */
+
+function activate() {
+  let i = 0
+
+  for (; i < items.length; i++) {
+    if (isBelowScroll(items[i])) {
+      break
+    }
+  }
+
+  activateItem(i)
+}
+
+/**
+ * Activate scroll spy thingy.
+ */
+
+window.addEventListener('scroll', e => activate())