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What is the JavaScript code/event(s) that is used by sites like stackoverflow and Gmail to test for the user exiting the page once they have begun editing and try to navigate away?

"Are you sure you want to navigate away from this page?"

What is the JavaScript code/event(s) that is used by sites like stackoverflow and Gmail to test for the user exiting the page once they have begun editing and try to navigate away?

"Are you sure you want to navigate away from this page?"
  • javascript
Share Improve this question asked Feb 25, 2010 at 2:24 Phillip SennPhillip Senn 47.7k91 gold badges261 silver badges378 bronze badges
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2 Answers 2

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The event used is called onbeforeunload.

<html>
<head>
    <script type="text/javascript" src="jquery.js"></script>
</head>
<body>
    <input id="foo"></input>

    <script type="text/javascript">
        function unloadMessage() {
            return "Are you sure you want to leave?";
        }

        function setConfirmUnload(enabled) {
            window.onbeforeunload = enabled ? unloadMessage : null;
        }

        $(document).ready(function() {
            $("#foo").keypress(function() {
                setConfirmUnload(true);
            });
        });
    </script>
</body>
</html>

onbeforeunload event. Mozilla provides useful example code. you just want to have a function that:

  1. Returns a string
  2. Sets e.returnValue to that string, where e is the argument or window.event.

The string will be used as your custom message.

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