Create a hidden field in JavaScript

How do you create a hidden field in JavaScript into a particular form ?

    <html>
    <head>
      <script type="text/javascript">
      var a =10;
function test() {
      if (a ==10)  {
        //  ... Here i need to create some hidden field for form named = chells
      }
}
      </script>  
    </head>   
    <body >
      <form id="chells" name="formsdsd">
      <INPUT TYPE=BUTTON OnClick="test();">
     </form> 
    </body>
    </html>

var input = document.createElement("input");

input.setAttribute("type", "hidden");

input.setAttribute("name", "name_you_want");

input.setAttribute("value", "value_you_want");

//append to form element that you want .
document.getElementById("chells").appendChild(input);

You can use jquery for create element on the fly

$('#form').append('<input type="hidden" name="fieldname" value="fieldvalue" />');

or other way

$('<input>').attr({
    type: 'hidden',
    id: 'fieldId',
    name: 'fieldname'
}).appendTo('form')

I've found this to work:

var element1 = document.createElement("input");
element1.type = "hidden";
element1.value = "10";
element1.name = "a";
document.getElementById("chells").appendChild(element1);

Create a hidden field in JavaScript

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