From e4b0467f9f4b054723528c93c4cda56a266f8687 Mon Sep 17 00:00:00 2001
From: Hanusz Leszek <leszek.hanusz@gmail.com>
Date: Sun, 29 Sep 2024 06:14:19 +0200
Subject: [PATCH] Add beforeunload event to add confirmation dialog when
 leaving page (#6279)

---
 js/main.js | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/js/main.js b/js/main.js
index 899bd8f0..71489f14 100644
--- a/js/main.js
+++ b/js/main.js
@@ -600,4 +600,15 @@ headerBar.addEventListener("click", (e) => {
   }
 });
 
+//------------------------------------------------
+// Add a confirmation dialog when leaving the page
+// Useful to avoid data loss
+//------------------------------------------------
+window.addEventListener('beforeunload', function (event) {
+  // Cancel the event
+  event.preventDefault();
+  // Chrome requires returnValue to be set
+  event.returnValue = '';
+});
+
 moveToChatTab();