How to capture browser close event?

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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.

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萌比男神i

2020-11-29 10:45

Use the beforeunload event.

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.

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说谎

2020-11-29 10:46

onbeforeunload

< body onbeforeunload="alert('Closing');">

Example :

<html> 
<head>
<title>`onbeforeunload` Event Demo</title>
</head>
<body onbeforeunload="return 'Are you sure you want to exit ?';">
</body> 
</html>

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醉话见心

2020-11-29 10:46

Attach a handler to the unload event.

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心在旅途

2020-11-29 10:48

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;
  }
};

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