Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<body>

<h3>A demonstration of how to access a Hidden Input Field</h3>

<input type="hidden" id="myInput" value="W3Schools">

<p>Click the button to get the value of the hidden input field.</p>

<button onclick="myFunction()">Try it</button>

<p id="demo"></p>

<script>
function myFunction() {
    var x = document.getElementById("myInput").value;
    document.getElementById("demo").innerHTML = x;
}
</script>

</body>
</html>