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javascript - open a custom popup on browser windowtab close - Stack Overflow

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I am trying to open a custom popup on browser window/tab close.

In details if a user clicks on the browser window/tab close button a custom popup will appear with some content or may be having some option asking to close or continue the page.

here is the code which only bring the default alert popup:

window.onbeforeunload = function() {
              var message = 'Do you want to leave this page?';
              return message;
          }

I am trying to open a custom popup on browser window/tab close.

In details if a user clicks on the browser window/tab close button a custom popup will appear with some content or may be having some option asking to close or continue the page.

here is the code which only bring the default alert popup:

window.onbeforeunload = function() {
              var message = 'Do you want to leave this page?';
              return message;
          }
Share Improve this question asked Oct 9, 2013 at 4:38 MufeedMufeed 1872 gold badges3 silver badges9 bronze badges 2
  • 6 No no, don't do this, it's a horrible user experience. Users expect a tab to get closed if they click to close it, showing a message reminds of spammy websites. – elclanrs Commented Oct 9, 2013 at 4:40
  • 1 thanks for your valuable words... but for the time being I want to achieve it for a important reason. – Mufeed Commented Oct 9, 2013 at 4:59
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6 Answers 6

Reset to default 8

<!DOCTYPE html>
<html>
<head>
	<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
	<script src="https://code.jquery.com/jquery-3.3.1.min.js"></script>
	<title>K3logics.com</title>
	<script>
		var mouseX = 0;
		var mouseY = 0;
		var popupCounter = 0;

		document.addEventListener("mousemove", function(e) {
			mouseX = e.clientX;
			mouseY = e.clientY;
			document.getElementById("coordinates").innerHTML = "<br />X: " + e.clientX + "px<br />Y: " + e.clientY + "px";
		});

		$(document).mouseleave(function () {
			if (mouseY < 100) {
				if (popupCounter < 1) {
					alert("Please do not close the tab!");
				}
				popupCounter ++;
			}
		});

	</script>
</head>
<body>
	<div id="page-wrap">
		<span id="coordinates"></span>	
		<h1>Hi, Move your mouse cursor around then try to close the window of browser! - <a href="https://www.k3logics.com" target="_blank">https://www.k3logics.com</a></h1>
	</div>
</body>
</html>

i would also suggest you dont do this, However, you asked a question and deserve an answer.

UPDATE (2022) This code does not work anymore due to new browser security settings.

var popit = true;
window.onbeforeunload = function() {
  if (popit == true) {
    popit = false;
    return "Are you sure you want to leave?";
  }
}

On october 2019 it's possible just in internet explorer https://developer.mozilla.org/en-US/docs/Web/API/Window/beforeunload_event

window.onbeforeunload = function (e) 
{
    e = e || window.event;

        e.returnValue = 'You want to leave ? ';


};

jsFiddle

The feature you're talking about is the window.onbeforeunload event, and unfortunately the only way it can be customized is to provide a custom string message for the user, because the potential for abuse is so high.

The api reference over at msdn for Internet Explorer states:

The default statement that appears in the dialog box, "Are you sure you want to navigate away from this page? ... Press OK to continue, or Cancel to stay on the current page.", cannot be removed or altered.

I take this to mean the dialog itself cannot be altered, all you can do is provide an additional context-specific message. I cant locate the same reference for Chrome, but it seems to be the same story there.

window.onbeforeunload = function() {
    //all you can do is provide a message..
    return "you have unsaved changes, if you leave they will be lost";
}

If you're open to use jQuery UI, then you can use Dialog. Simple and look attractive.

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