From d6b90271b87f22f6e71ed6279c5d86ad660080b6 Mon Sep 17 00:00:00 2001
From: Helen Chong <119173961+helenclx@users.noreply.github.com>
Date: Tue, 29 Aug 2023 13:41:45 +0800
Subject: [PATCH] Add condition for left sidebar's existence

---
 js/toc.js | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/js/toc.js b/js/toc.js
index 4658285b..d095f839 100644
--- a/js/toc.js
+++ b/js/toc.js
@@ -47,13 +47,24 @@ window.addEventListener('DOMContentLoaded', (event) => {
         }
         tocOl.append(tocFragment);
         toc.append(tocOl);
+        
         const tocClone = tocOl.cloneNode(true);
-        tocSidebar.appendChild(tocClone);
+        if (tocSidebar) {
+            tocSidebar.appendChild(tocClone);
+        }
     } else {
         toc.classList.add('hidden');
         leftSidebar.classList.add('hidden');
     }
 
+    // Close article ToC accordion and the left sidebar for small screen sizes
+    if (window.innerWidth < 480) {
+        toc.removeAttribute("open");
+        leftSidebar.classList.add("hidden");
+    } else {
+        toc.setAttribute("open", true);
+    }
+
     // Remove the stickiness of the sidebar ToC if it is larger than screen height
     function preventSidebarOverflow() {
         if (document.documentElement.clientHeight < tocSidebar.offsetHeight + 50) {