feat: caching for sidebar items from data

assets/css/components/sidebar.css

@@ -30,4 +30,8 @@
   .sidebar-item-inactive {
     @apply hx-text-gray-500 hover:hx-bg-gray-100 hover:hx-text-gray-900 contrast-more:hx-border contrast-more:hx-border-transparent contrast-more:hx-text-gray-900 contrast-more:hover:hx-border-gray-900 dark:hx-text-neutral-400 dark:hover:hx-bg-primary-100/5 dark:hover:hx-text-gray-50 contrast-more:dark:hx-text-gray-50 contrast-more:dark:hover:hx-border-gray-50;
   }
+
+  .sidebar-item-list-container {
+    @apply hx-relative hx-flex hx-flex-col hx-gap-1 before:hx-absolute before:hx-inset-y-1 before:hx-w-px before:hx-bg-gray-200 ltr:hx-ml-3 ltr:hx-pl-3 ltr:before:hx-left-0 rtl:hx-mr-3 rtl:hx-pr-3 rtl:before:hx-right-0 dark:before:hx-bg-neutral-800;
+  }
 }

assets/js/sidebar.js

@@ -1,3 +1,12 @@
+/**
+ * Check if the element is visible.
+ * @param {Element} element Dom element
+ * @returns boolean
+ */
+function isVisible(element) {
+  return element.offsetWidth > 0 || element.offsetHeight > 0;
+}
+
 document.addEventListener("DOMContentLoaded", function () {
   const buttons = document.querySelectorAll(".hextra-sidebar-collapsible-button");
   buttons.forEach(function (button) {
@@ -5,8 +14,41 @@ document.addEventListener("DOMContentLoaded", function () {
       e.preventDefault();
       const list = button.parentElement.parentElement;
       if (list) {
-        list.classList.toggle("open")
+        list.classList.toggle("open");
       }
     });
   });
+
+  const isCached = "{{- site.Params.page.sidebar.cache | default false -}}" === "true";
+  const currentPagePath = window.location.href;
+
+  if (isCached) {
+    // find the current page in the sidebar and open the parent lists
+    const sidebar = document.querySelector(".hextra-sidebar-container");
+    if (sidebar) {
+      // find a tags and compare href with current page path
+      const links = sidebar.querySelectorAll("a");
+      links.forEach(function (link) {
+        const linkPath = link.href;
+
+        if (currentPagePath === linkPath) {
+          // add active class to the link
+          link.classList.add("sidebar-item-active");
+          link.classList.remove("sidebar-item-inactive");
+
+          if (!isVisible(link)) {
+            return;
+          }
+          // recursively open parent lists
+          let parent = link.parentElement;
+          while (parent && !parent.classList.contains("hextra-sidebar-container")) {
+            if (parent.tagName === "LI" && parent.classList.contains("sidebar-item-list")) {
+              parent.classList.add("open");
+            }
+            parent = parent.parentElement;
+          }
+        }
+      });
+    }
+  }
 });