From c0480f888db7e5418a2e05da0dbc90edbf1fe1c5 Mon Sep 17 00:00:00 2001
From: duanyu5871 <344094952@qq.com>
Date: Thu, 16 Oct 2025 09:50:09 +0800
Subject: [PATCH] beforeunload event listener update (#1107)

* beforeunload update

* Rename to EJS_disableAutoUnload

* Remove value from index.html since undefined is a falsy value

---------

Co-authored-by: Ethan O'Brien <ethan.a.obrien@gmail.com>
Co-authored-by: Ethan O'Brien <77750390+ethanaobrien@users.noreply.github.com>
---
 data/loader.js       | 1 +
 data/src/emulator.js | 5 +++++
 2 files changed, 6 insertions(+)

diff --git a/data/loader.js b/data/loader.js
index 4c0ec1a..96796ab 100644
--- a/data/loader.js
+++ b/data/loader.js
@@ -127,6 +127,7 @@
     config.browserMode = window.EJS_browserMode;
     config.shaders = Object.assign({}, window.EJS_SHADERS, window.EJS_shaders ? window.EJS_shaders : {});
     config.fixedSaveInterval = window.EJS_fixedSaveInterval;
+    config.disableAutoUnload = window.EJS_disableAutoUnload;
 
     let systemLang;
     try {
diff --git a/data/src/emulator.js b/data/src/emulator.js
index ca74f56..7c16a70 100644
--- a/data/src/emulator.js
+++ b/data/src/emulator.js
@@ -1159,6 +1159,11 @@ class EmulatorJS {
             }, 0);
         });
         this.addEventListener(window, "beforeunload", (e) => {
+            if (this.config.disableAutoUnload) {
+                e.preventDefault();
+                e.returnValue = "";
+                return
+            } 
             if (!this.started) return;
             this.callEvent("exit");
         });