plomlompom.com Git - misc/blob - todo_templates/watch_form.html

   1 <script>
   2     var formHasChanged = false;
   3     var submitted = false;
   4     var form_to_watch = document.getElementById('form_to_watch');
   5     form_to_watch.addEventListener('input', function() {
   6         formHasChanged = true;
   7     });
   8     form_to_watch.addEventListener('submit', function() {
   9         submitted = true;
  10     });
  11     window.addEventListener('beforeunload', function(event) {
  12         if (formHasChanged && !submitted) {
  13             var confirmationMessage = 'You have unsaved changes. Are you sure you want to leave?';
  14             event.returnValue = confirmationMessage;
  15             return confirmationMessage;
  16         }
  17     });
  18 </script>
  19