A prompt box is often used if you want the user to input a value before entering a page.
<script language="javascript">
function displayDate()
{
alert(Date());
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Display</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<button type="button" onclick="displayDate()">DisplayDate</button>
</div>
</form>
</body>
</html>
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