Javascript 除非单击“保存”或“提交”按钮，否则在卸载之前启用

除非单击提交或保存按钮，否则我希望在卸载之前显示

on

弹出窗口。有什么想法吗

到目前为止，我有：

Drupal.behaviors.PreventNavigation = function() {
  window.onbeforeunload = function ()   {
    return "Please save your work before navigating from this page";
  }
}

以下是我的解决方案：

Drupal.behaviors.PreventNavigation = function() {
  var clicked = false;
  $('#edit-save').click(function() {
    clicked = true;
  });
  $('#edit-submit-application').click(function() {
    clicked = true;
  });
  window.onbeforeunload = confirmExit;
  function confirmExit() {
   if (!clicked) {
     return "Please Save your work";
   }
  }
}