view :
<div id="plotingSiswa" class="modal fade" role="dialog">
          <div class="modal-dialog">

            <!-- Modal content-->
            <div class="modal-content">
              <div class="modal-header">
                <button type="button" class="close" data-dismiss="modal">&times;</button>
                <h4 class="modal-title"></h4>
              </div>
              <div class="modal-body">
                <div class="form-body">
                  <div class="form-group">
                    <label class="control-label col-md-3">Tahun Pelajaran</label>
                    <div class="col-md-9">
                      <input id="kodexx" name="kode" class="form-control" type="hidden">
                      <input id="tapel" name="kode" class="form-control" type="text" disabled>
                      <span class="help-block"></span>
                    </div>
                  </div>
                  <div class="form-group" id="divFormGroup">

                  </div>

                </div>
              </div>
              <div class="modal-footer">
                <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
              </div>
            </div>

          </div>
    </div>
</section>
    <!-- /.content -->
  </div>

<script>
$(function() {
  $('#tablePersetujuan').dataTable({
    "ajax": {
      "url":"<?php echo site_url();?>admin/home_admin/getDataPersetujuan",
      "type":"POST"
    },
  });
});
$('#plotingSiswa').on('show.bs.modal', function(event) {
  var button = $(event.relatedTarget);
  var id = button.data('kode');
  var jurusan = button.data('jurusan');
  var jumlah = button.data('jumlah');
  var namaDudi = button.data('nama_dudi');
  var taPel = button.data('tapel');
  var modal = $(this);
  modal.find('#kodexx').val(id);
  modal.find('#tapel').val(taPel);
  modal.find('.modal-title').text('Ploting Siswa Jurusan ' + jurusan +' - '+namaDudi);
  for(i=1;i<=jumlah;i++) {
        $("#divFormGroup").append('<label class="control-label col-md-3">Nama Siswa</label><div class="col-md-9"><input name="namaSiswa" placeholder="Nama Siswa" id="namaSiswax'+i+'" class="form-control" type="text"><span class="help-block"></span></div>');
        $( "#namaSiswax"+i ).autocomplete({
          source: "<?php echo site_url('admin/home_admin/get_SiswaPloting'); ?>",
          select: function (event, ui) {
            $('[name="namaSiswa"]').val(ui.item.namenya);
          }
        });
  }
});
Controller :
function get_SiswaPloting()
  {
    if(isset($_GET['term'])) {
      $result = $this->login_model->showgetSiswaPloting($_GET['term']);
      if (count($result)>0) {
        foreach ($result as $key) {
          $array_result[] = array (
            'namenya' => $key->NAMA,
            'nisnya' => $key->NIS,
          );
          echo json_encode($array_result);
          # code...
        }
      }
    }
  }
Model :
public function showgetSiswaPloting($namaSiswa)
  {

    $this->db->like('NAMA',$namaSiswa,'both');
    return $this->db->get('m_siswa')->result();
  }