Warn about unsaved settings using jquery.areyousure

library/jquery.AreYouSure/ays-beforeunload-shim.js

@@ -0,0 +1,31 @@
+/*!
+ * An experimental shim to partially emulate onBeforeUnload on iOS.
+ * Part of https://github.com/codedance/jquery.AreYouSure/
+ *
+ * Copyright (c) 2012-2014, Chris Dance and PaperCut Software http://www.papercut.com/
+ * Dual licensed under the MIT or GPL Version 2 licenses.
+ * http://jquery.org/license
+ *
+ * Author:  chris.dance@papercut.com
+ * Date:    19th May 2014
+ */
+$(function() {
+  if (!navigator.userAgent.toLowerCase().match(/iphone|ipad|ipod|opera/)) {
+    return;
+  }
+  $('a').bind('click', function(evt) {
+    var href = $(evt.target).closest('a').attr('href');
+    if (href !== undefined && !(href.match(/^#/) || href.trim() == '')) {
+      var response = $(window).triggerHandler('beforeunload', response);
+      if (response && response != "") {
+        var msg = response + "\n\n"
+          + "Press OK to leave this page or Cancel to stay.";
+        if (!confirm(msg)) {
+          return false;
+        }
+      }
+      window.location.href = href;
+      return false;
+     }
+  });
+});