Set the value of an input field
This is one way of doing it:
document.getElementById("mytext").value = "My value";
I use 'setAttribute' function:
<input type="text" id="example"> // Setup text field <script type="text/javascript"> document.getElementById("example").setAttribute('value','My default value');</script>
if your form contains an input field like
<input type='text' id='id1' />then you can write the code in javascript as given below to set its value as
document.getElementById('id1').value='text to be displayed' ;