Javascript 如何捕获浏览器关闭事件？
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How to capture browser close event?
提问by Lan
I want to capture the browser close event in my application and show a confirm box to user. I am using JSF 2.0 and richfaces 4.0.
我想在我的应用程序中捕获浏览器关闭事件并向用户显示一个确认框。我使用的是 JSF 2.0 和 Richfaces 4.0。
回答by Praveen Prasad
window.onbeforeunload = function ()
{
var shallIAlertUser = Do_Whatever(); //get boolen value
if (shallIAlertUser) {
//this will alert user
return 'Are you sure?';
}
else {
//this wont
window.onbeforeunload = undefined;
}
};
回答by alex
Use the beforeunloadevent.
使用beforeunload事件。
window.onbeforeunload = function(event) {
event = event || window.event;
var confirmClose = 'Are you sure?';
// For IE and Firefox prior to version 4
if (event) {
event.returnValue = confirmClose;
}
// For Safari
return confirmClose;
}
Keep in mind this will be fire for other events besides closing the window, such as reloading and form submission.
请记住，除了关闭窗口外，其他事件也会触发，例如重新加载和表单提交。
回答by Jigar Joshi
onbeforeunload
onbeforeunload
< body onbeforeunload="alert('Closing');">
Example :
例子 ：
<html>
<head>
<title>`onbeforeunload` Event Demo</title>
</head>
<body onbeforeunload="return 'Are you sure you want to exit ?';">
</body>
</html>
回答by Aaron Digulla
Attach a handler to the unloadevent.
将处理程序附加到unload事件。
