From 4ea3163c314c78a9bf46f00451f28f959fc498c6 Mon Sep 17 00:00:00 2001
From: Patrizio Bekerle <patrizio@bekerle.com>
Date: Fri, 29 May 2020 10:56:35 +0200
Subject: [PATCH] Add beforeunload support (VPU/Apps/Signature#7)
---
packages/app-shell/src/app-shell.js | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/packages/app-shell/src/app-shell.js b/packages/app-shell/src/app-shell.js
index e6f191bc..acb3446e 100644
--- a/packages/app-shell/src/app-shell.js
+++ b/packages/app-shell/src/app-shell.js
@@ -286,6 +286,23 @@ export class AppShell extends ScopedElementsMixin(LitElement) {
onMenuItemClick(e) {
e.preventDefault();
+
+ // if not the current page was clicked we need to check if the page can be left
+ if (!e.currentTarget.className.includes("selected")) {
+ // simulate a "beforeunload" event
+ const event = new CustomEvent("beforeunload", {
+ bubbles: true,
+ cancelable: true,
+ });
+
+ const eventResult = window.dispatchEvent(event);
+
+ // if someone canceled the "beforeunload" event we don't want to leave the page
+ if (!eventResult) {
+ return;
+ }
+ }
+
const link = e.composedPath()[0];
const location = link.getAttribute('href');
this.router.updateFromPathname(location);
--
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