Mozilla firefox not working with [removed]

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I\'m using window.onbeforeunload to display a message to the user on windows close, the function works well with Chrome and IE but it doesn\'t work with Firefox

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悲&欢浪女

2020-11-30 12:13

I looked for a Firefox onbeforeunload solution over 2 days and with no luck, so I worked hard on this, and did it with a little trick.

In my trick, the user needs to click on the browser window at least once. If the user clicks on the window and then clicks on the back button, refreshes the page, or tries to exit the page, onbeforeunload events will fire,

$(window).on('beforeunload', function () {
    return "Are you sure you want to exit this page?";
});
$(window).one('click',function(){
    alert('hi');
    $('.javavoid').trigger('click');
});

.hide{display:none;}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<body>
    <a class="hide javavoid" href="javascript:void(0)">asdf</a>
    <p>Welcome, click anywhere then click on back button or refresh page</p>
</body>

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Happy的楠姐

2020-11-30 12:16
Why are you doing browser-sniffing here? The "Firefox" branch of your code is returning the return value of window.confirm, which is a boolean. But a boolean isn't callable, so assigning it to window.onbeforeunload is the same as assigning null.

What you probably want to do is remove the browser-sniffing and just do:
```
window.onbeforeunload = confirmExamClose;
```
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轻奢々

2020-11-30 12:21
Using the code given in the MDN works for me in firefox/chrome/IE11 (haven't try other browser for now).
```
window.onbeforeunload = function (e) {
  var e = e || window.event;

  // For IE and Firefox
  if (e) {
    e.returnValue = 'Any string';
  }

  // For Safari
  return 'Any string';
};
```
here is the doc : Mdn window.onbeforeunload doc
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灰色年华

2020-11-30 12:26

Here is working solution for Firefox and Chrome. I haven't yet tested in Safari and Opera.

var myEvent = window.attachEvent || window.addEventListener;
var chkevent = window.attachEvent ? 'onbeforeunload' : 'beforeunload'; /// make IE7, IE8 compitable

myEvent(chkevent, function(e) { // For >=IE7, Chrome, Firefox
    var confirmationMessage = 'Are you sure to leave the page?';
    (e || window.event).returnValue = confirmationMessage;
    return confirmationMessage;
});

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