FireFox不显示任何警告对话框窗口beforeunload事件 [英] FireFox doesn't display any warning dialog for window beforeunload event

问题描述

目前正在使用最新版本的Firefox桌面浏览器。尝试捕获事件之前的窗口。下面的代码适用于IE，Chrome和Safari，但不适用于Firefox。

  window.addEventListener（beforeunload，function（e） {
 var confirmationMessage =Test Test; 
 e.returnValue = confirmationMessage; 
 return confirmationMessage; 
}）; 
  

解决方案

b

为了防止不必要的弹出窗口，浏览器可能不会显示在beforeunload事件处理程序中创建的提示，除非页面已经被交互。
< blockquote>

如果用户之前没有与页面进行交互，则无法显示弹出窗口。另外，最好使用下面的代码：

  window.onbeforeunload = function（e）{
 var dialogText ='对话文本'; 
 e.returnValue = dialogText; 
返回dialogText; 
}; 
  

Currently working the latest version of Firefox desktop browser. Trying to capture the window beforeunload event. Below code works for IE, Chrome and Safari but not with Firefox.

window.addEventListener("beforeunload", function(e) {
  var confirmationMessage = "Test Test";
  e.returnValue = confirmationMessage;
  return confirmationMessage;
});

解决方案

From Firefox's documentation:

To combat unwanted pop-ups, browsers may not display prompts created in beforeunload event handlers unless the page has been interacted with.

You cannot show pop-up if user didn't interacted with the page before. Also, it is better to use the following code:

window.onbeforeunload = function(e){
  var dialogText = 'Dialog text here';
  e.returnValue = dialogText;
  return dialogText;
};

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