<html>
<head>
<script>
function displayResult()
{
var x=document.getElementById("hidden1").value;
alert(x);
}
</script>
</head>
<body>
<form>
<input type="hidden" id="hidden1" value="W3Schools">
</form>
<button type="button" onclick="displayResult()">Display value of hidden field</button>
</body>
</html>