Let’s suppose on your website you have a form. When the user fills the form and navigates to a different URL location, you want to warn the user that you will lose your form data. Check out the following code.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<script type="text/jscript">
var leaving=true;
window.onbeforeunload = function(e)
{
if (!e) e = event;
if (leaving) e.returnValue = "You might loose your changes";
}
</script>
<title></title>
</head>
<body>
<a href="http://www.google.com/">Leave</a>
<a href="page1.htm" onClick="leaving=false">stay on site</a>
</body>
</html>
Tags:
Javascript