1 files changed, 11 insertions, 0 deletions
diff --git a/web/static/dartboat.js b/web/static/dartboat.js
index aacb1bc..b2b8481 100644
--- a/web/static/dartboat.js
+++ b/web/static/dartboat.js
@@ -123,6 +123,17 @@ function storeOpt(opt, val) {
 	localStorage.setItem(UTF8ToString(opt), UTF8ToString(val));
 }
 
+function prevDef(e) {
+	e.preventDefault();
+}
+
+function enableExitDialogue(enable) {
+	if (enable)
+		window.addEventListener('beforeunload', prevDef);
+	else
+		window.removeEventListener('beforeunload', prevDef);
+}
+
 function boatAfloat() {
 	if (document.readyState === 'loading')
 		document.addEventListener('DOMContentLoaded', () => _init());