Server side datatable checkboxes

<script type="text/javascript">
var id_materi = <?php echo $id_materi_log ?>;
var id_ujian = <?php echo $id_ujian ?>;
var table = $('#table_pilih_soal').DataTable({

    "processing": true,
    "serverSide": true,
    "order": [],

    "ajax": {
        "url": "<?php echo site_url('admin/ujian/table_pilih_soal/')?>"+id_materi,
        "type": "POST",
        "data":{id_ujian:id_ujian},
    },

    "columnDefs": [
    {
        "targets": [ 0 ],
        "orderable": false,
        "checkboxes": {
          'selectRow' : true,
        },
    },
    ],
    'select': {
      'style': 'multi'
   },

});

</script>