Add beforeunload

src/preload.ts

@@ -20,6 +20,15 @@ export function preLoadCheck(){
         localStorage.setItem('mainpage', searchParams.get('mainpage'));
     }
 
+    if(isWeb) {
+        //Add beforeunload event listener to prevent the user from leaving the page
+        window.addEventListener('beforeunload', (e) => {
+            e.preventDefault()
+            //legacy browser
+            e.returnValue = true
+        })
+    }
+    
     
     // Redirect to the main page if the user has not visited the main page
     if(localStorage.getItem('mainpage') !== 'visited') {