How to clear the input text value already entered ?

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Javascript

JSP

First the user clicks a button to make the modal appear, they then fill out form that is on the modal, and when they click save on the modal, the data entered on the modal displays in the form. i want to show , when user again clicks the ADDPOSITION , already entered text should be cleared and cannot be changed previous saved text.

What I have tried:

<form name="stuff">
<!-- Button trigger modal -->
<button class="btn btn-primary" data-toggle="modal" data-target="#myModal">
    add position
</button>

<!-- Modal -->
<div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="false">
<div class="modal-dialog">
    <div class="modal-content">
        <div class="modal-header">
            <button type="button" class="close" data-dismiss="modal" aria-hidden="false">
                ×
            </button>
            <h3 class="modal-title" id="myModalLabel">add Position</h3>
        </div>
        <div class="modal-body">
            <form name="modal-form" class="form-horizontal">
                <!-- form stuff goes here -->
                 <input type="text"  name="job_title" value="" />
     <input type="text"  name="from" value="" />  – <input type="text" name="to" value="" /> <input type="text"  name="total experience" value="" /> 
     <input type="text"  name="industries" value="" /> 
            </form>
        </div>
        <div class="modal-footer">
            <button type="button" class="btn btn-default" data-dismiss="modal">
                Close
            </button>
            <button type="button" type="submit" class="btn btn-primary" id="save" data-dismiss="modal">
                Save
            </button>
        </div>
        </div><!-- /.modal-content -->
      </div><!-- /.modal-dialog -->
    </div><!-- /.modal -->

    <!-- after save button data entered on modal goes here i.e. -->
     <input type="text" disabled name="job_title[]" value="Software Developer" />
     <input type="text" disabled name="from[]" value="November 2013" />  – <input type="text" disabled name="to[]" value="present" /> <input type="text" disabled name="total experience[]" value="2 months" /> 
     <input type="text" disabled name="industries[]" value="IT" /> 
</form>

javascript:
$('#save').click(function() {
$( "input[name='job_title[]']" ).val($("input[name='job_title']").val());
$( "input[name='from[]']" ).val($("input[name='from']").val());
$( "input[name='to[]']" ).val($("input[name='to']").val());
$( "input[name='total experience[]']" ).val($("input[name='total experience']").val());
$( "input[name='industries[]']" ).val($("input[name='industries']").val());
});