Datatables Server Side

$(document).ready(function() {
    table = $('#tableData').DataTable({
        "responsive": true,
        "processing": false,
        "serverSide": true,
        "order": [2, 'asc'],
        "lengthMenu": [
                [20, 50, 75, 100, -1],
                [20, 50, 75, 100, "All"]
        ],
        "pageLength": 20,
        "ajax": {
            "url": "<?php echo site_url('admin/rtlh/pengajuan/data_list/'.$this->uri->segment(4).'/'.$this->uri->segment(5)); ?>",
            "type": "POST",
            "data": function(data) {
                data.lstStatusUsulan    = $('#lstStatusUsulan').val();
                data.lstStatusRTLH      = $('#lstStatusRTLH').val();
            }
        },
        "columnDefs": [
        {
            "targets": [ 0 ],
            "orderable": false,
        },
        ],
    });

    $('#btn-filter').click(function() {
        table.ajax.reload();
        $('#filterData').modal('hide');
    });

    $('#btn-reset').click(function() {
        $('#form-filter')[0].reset();
        table.ajax.reload();
        $('#filterData').modal('hide');
    });
});