JavaScript - filtros de busquda individual en cabezera datatables [miniAporte]

<div class="table-responsive">

             <table id="employee_data" class="table table-striped table-bordered">

                  <thead>

                       <tr>

                        <td>MSDS LINK</td>

						<td>Num Spec</td>

						<td>Substance</td>

						<td>Casnum</td>

						<td>Status Reach</td>

						<td>Date Prohibition</td>

					</tr>

	               </tr>

					 <tfoot style="display: table-header-group;">

					 <tr>

					                        <th >MSDS LINK</th>

						<th>Num Spec</th>

						<th>Substance</th>

						<th>Casnum</th>

						<th>Status Reach</th>

						<th>Date Prohibition</th>

				 </tr>

					</tfoot>

                  </thead>

                  <?php

                  while($row = mysqli_fetch_array($result))

                  {

                       echo '

                       <tr>

                            <td> <a href="'.$row["Hiperlink"].' ">'.$row['Hiperlink'].'</a></td>

                            <td>'.$row["name_vendor"].'</td>

                            <td>'.$row["Name_contact"].'</td>

                            <td>'.$row["Part_number"].'</td>

							<td>'.$row["second_number"].'</td>

							<td>'.$row["lado_parte"].'</td>

							<td>'.$row["Pack_ml"].'</td>

							<td>'.$row["Usein_prod"].'</td>

							<td>'.$row["status_part"].'</td>

							<td>'.$row["num_spec"].'</td>

							<td>'.$row["name_sus"].'</td>

							<td>'.$row["casnum_sus"].'</td>

							<td>'.$row["status_sus"].'</td>

							<td>'.$row["Prohi_sus"].'</td>

                       </tr>

                       ';

                  }

                  ?>

             </table>

        </div>

   </div>

<script>

$(document).ready(function() {

    $('#employee_data').DataTable( {

        "lengthMenu": [[5,10, 25, 50, -1], [5,10, 25, 50, "All"]]

    } );

} );

</script>

  <script>

$(document).ready(function() {

    // Setup - add a text input to each footer cell

    $('#employee_data tfoot th').each( function () {

        var title = $(this).text();

        $(this).html( '<input type="text" placeholder="Filter by " />' );

    } );

    // DataTable

    var table = $('#employee_data').DataTable();

    // Apply the search

    table.columns().every( function () {

        var that = this;

        $( 'input', this.footer() ).on( 'keyup change', function () {

            if ( that.search() !== this.value ) {

                that

                    .search( this.value )

                    .draw();

            }

        } );

    } );

} );

</script>