Similar questions have been asked before BUT all/most of them suggested that I used this:
$(document).ready(function() {
    // put your Javascript here
});
Even with using that It still does not work:
Code is JSFiddle: http://jsfiddle.net/Guruprasad_Rao/ooexfj26/
HTML:
<html>
  <head>
  </head>
  <body>
    <div class="row">
      <div class="col-xs-12 col-md-12">
        <table class="table table-condensed table-hover table-bordered">
          <thead>
            <tr>
              <th>Firstname</th>
              <th>Lastname</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td>Johnn</td>
              <td>Doe</td>
            </tr>
            <tr>
              <td>Sam</td>
              <td>Smith</td>
            </tr>
          </tbody>
        </table>
      </div>
    </div>
    <div class="modal fade" id="myModal">
      <div class="modal-dialog">
        <div class="modal-content">
          <div class="modal-header">
            <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">×</span></button>
            <h4 class="modal-title">EDIT</h4>
          </div>
          <div class="modal-body">
            <p><input type="text" class="input-sm" id="txtfname"/></p>
            <p><input type="text" class="input-sm" id="txtlname"/></p>
          </div>
          <div class="modal-footer">
            <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
            <button type="button" class="btn btn-primary">Save changes</button>
          </div>
        </div>
        <!-- /.modal-content -->
      </div>
      <!-- /.modal-dialog -->
    </div>
    <!-- /.modal -->
    <script src="modal.js" type="text/javascript"></script>
  </body>
</html>
jQuery:
$(document).ready(function () {
  $('table tbody tr  td').on('click', function () {
    $("#myModal").modal("show");
    $("#txtfname").val($(this).closest('tr').children()[0].textContent);
    $("#txtlname").val($(this).closest('tr').children()[1].textContent);
  });
});
I have even tried adding these at the end still no difference:
  <script src= "http://code.jquery.com/jquery-1.10.2.min.js" type="text/javascript"></script>
  <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
The result: All components of html show and no JS functionality seems to be present
 
     
     
    