Demo - set-hidden-field-jquery

Edit This Code :
<html>
<head>
</head>
<body>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script><br/>
<input id="txtName" value="" type="text"/>
<input id="myInputHidden" name="myInputName" type="hidden" value="Codepedia" />
<button id="btnShow1"> Set Hidden field Value by ID</button> 
<button id="btnShow2"> Set Hidden field Value by Name</button> 
<br/>
<script>
$(document).ready(function(){
$("#btnShow1").on('click', function () {
  var getTxtValue = $("#txtName").val(); // this gives textbox value   
  $("#myInputHidden").val(getTxtValue); // this will set hidden field value
  alert(getTxtValue);  

});

$("#btnShow2").on('click', function () {
  var getTxtValue = $("#txtName").val(); // this gives textbox value   
  $("input[name=myInputName]").val(getTxtValue); // this will set hidden field value
  alert(getTxtValue);   
});
});
</script>
</body>
</html>
Result :