window.onbeforeunload和window.onunload在Firefox，Safari，Opera中不起作用? [英] window.onbeforeunload and window.onunload is not working in Firefox, Safari, Opera?

问题描述

在我的聊天应用程序中，我需要在关闭应用程序时得到用户的确认.

In my chat application I need to get confirmation from user, when my application closes.

因此我将window.onbeforeunload用于确认警报，将window.onunload用于 logout().

So I used the window.onbeforeunload for confirmation alert and window.onunload for logout().

1. 但是这两个功能都可以在IE和Chrome中使用. (应用程序运行正常)

1. But both functions are working in IE and Chrome. (Application works fine)

window.onbeforeunload在Opera中不起作用，我的消息也不会在Firefox中显示.

window.onbeforeunload not working in Opera and my message will not get displayed in Firefox.

window.onunload在Safari，Opera和Firefox中不起作用.

window.onunload not working in Safari, Opera and Firefox.

我的JavaScript代码将是:

My JavaScript code will be:

// Used for confirmation, to closing the window 
window.onbeforeunload = function () {

    return  "Are you sure want to LOGOUT the session ?";
}; 

// Used to logout the session, when browser window was closed 
window.onunload = function () {

    if((sessionId != null)&&(sessionId!="null")&& (sessionId != ""))
        logout();
};

我也尝试过使用JQuery进行相同的功能，

I also tried the same function with JQuery,

<script type="text/javascript">

    $(window).on('beforeunload', function() {
        return 'Are you sure want to LOGOUT the session ?';
    });

    $(window).unload(function() {
        if ((sessionId != null) && (sessionId != "null") && (sessionId != "")) {
            logout();
        }
    });
    
</script>

推荐答案

我通过将Ajax异步请求更改为同步请求，获得了除Opera以外的所有浏览器中onunload的解决方案.

I got the solution for onunload in all browsers except Opera by changing the Ajax asynchronous request into synchronous request.

xmlhttp.open("POST","LogoutAction",false);

它适用于除 Opera 以外的所有浏览器.

It works well for all browsers except Opera.

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