On taint, also prevent user from closing/reloading window without confirmation.

diff --git a/src/templates/_macros.tmpl b/src/templates/_macros.tmpl
index dc25e0b80eb57995e73bf1bb9f18edccaa6aea57..05dc359775b55f9a4aee1439ea24bd3341a8605d 100644 (file)
--- a/src/templates/_macros.tmpl
+++ b/src/templates/_macros.tmpl
@@ -128,6 +128,11 @@ function taint() {
     Array.from(document.getElementsByClassName('disable_on_change')).forEach((el) => {
         recursive_span_disable(el);
     });
+    // try to catch user closing or reloading window
+    window.addEventListener('beforeunload', function(e) {
+        e.preventDefault();
+        e.returnValue = true; }
+    );
     // remove oninput handlers no longer needed (since we only ever go one way)
     Array.from(document.querySelectorAll('*')
         ).filter(el => (el.oninput !== null)