如何将行分组的结果移至DATATABLE

Question

我需要在<tfoot>中显示分组行的结果，因为导出时出现问题，所以不能导出行分组的结果。我想我可以通过在<tfoot>

中获得这些结果来解决我的问题

    $(document).ready(function () {
        var table = $('#example').DataTable({



            "footerCallback": function (row, data, start, end, display) {
                var api = this.api(), data;

                // Remove the formatting to get integer data for summation
                var intVal = function (i) {
                    return typeof i === 'string' ?
                        i.replace(/[\L,]/g, '') * 1 :
                        typeof i === 'number' ?
                        i : 0;
                };

                // Total over all pages
                total = api
                    .column(5)
                    .data()
                    .reduce(function (a, b) {
                        return intVal(a) + intVal(b);
                    }, 0);

                // Total over this page
                pageTotal = api
                    .column(5, { page: 'current' })
                    .data()
                    .reduce(function (a, b) {
                        return intVal(a) + intVal(b);
                    }, 0);

                // Update footer
                $(api.column(5).footer()).html(
                   // '' + pageTotal + ' ( L' + total + ' total)'
                   '' + total.toFixed(2)
                );
            },

            "columnDefs": [
                { "visible": false, "targets": 2 }
            ],
            "order": [[2, 'asc']],
            "displayLength": 25,
            "drawCallback": function (settings) {
                var api = this.api();
                var rows = api.rows({ page: 'all' }).nodes();
                var last = null;

                // Remove the formatting to get integer data for summation
                var intVal = function (i) {
                    return typeof i === 'string' ?
                          i.replace(/[\$,]/g, '') * 1 :
                          typeof i === 'number' ?
                        i : 0;
                };

                total = [];
                api.column(2, { page: 'all' }).data().each(function (group, i) {
                    group_assoc = group.replace(' ', "_");
                    console.log(group_assoc);
                    if (typeof total[group_assoc] != 'undefined') {
                        total[group_assoc] = total[group_assoc] + intVal(api.column(5).data()[i]);
                    } else {
                        total[group_assoc] = intVal(api.column(5).data()[i]);
                    }
                    if (last !== group) {
                        $(rows).eq(i).before(
                            '<tr class="group"><td colspan="4">' + group + '</td><td class="' + group_assoc + '"></td></tr>'
                        );

                        last = group;
                    }
                });
                for (var key in total) {
                    $("." + key).html("L" + total[key].toFixed(2));
                }


            }
        });


    });


<link href="https://cdn.datatables.net/1.10.19/css/jquery.dataTables.min.css" rel="stylesheet" />
<link href="https://cdn.datatables.net/rowgroup/1.0.4/css/rowGroup.dataTables.min.css" rel="stylesheet" />

<script src="https://code.jquery.com/jquery-3.3.1.js"></script>
<script src="https://cdn.datatables.net/1.10.19/js/jquery.dataTables.min.js"></script>
<script src="https://cdn.datatables.net/rowgroup/1.0.4/js/dataTables.rowGroup.min.js"></script>

<script src="//cdn.datatables.net/plug-ins/1.10.19/dataRender/intl.js"></script>


<div class="container">
    <div class="row">
        <div class="col-xs-12">

            <table id="example" class="table table-bordered table-hover dt-responsive display" cellspacing="0" width="100%">
                <thead>
                    <tr>
                        <th>Name</th>
                        <th>Position</th>
                        <th>Office</th>
                        <th>Age</th>
                        <th>Start date</th>
                        <th>Salary</th>
                    </tr>
                </thead>
                <tfoot>
                    <tr>
                        <th></th>
                        <th></th>
                        <th></th>
                        <th></th>
                        <th></th>
                        <th>Total:</th>


                    </tr>
                </tfoot>
                <tbody>

                    <tr>
                        <td>Garrett Winters</td>
                        <td>Accountant</td>
                        <td>Tokyo</td>
                        <td>63</td>
                        <td>2011/07/25</td>
                        <td>$170,750</td>
                    </tr>


                    <tr>
                        <td>Airi Satou</td>
                        <td>Accountant</td>
                        <td>Tokyo</td>
                        <td>33</td>
                        <td>2008/11/28</td>
                        <td>$162,700</td>
                    </tr>
                    <tr>
                        <td>Brielle Williamson</td>
                        <td>Integration Specialist</td>
                        <td>New York</td>
                        <td>61</td>
                        <td>2012/12/02</td>
                        <td>$372,000</td>
                    </tr>
                    <tr>
                        <td>Herrod Chandler</td>
                        <td>Sales Assistant</td>
                        <td>San Francisco</td>
                        <td>59</td>
                        <td>2012/08/06</td>
                        <td>$137,500</td>
                    </tr>


                    <tr>
                        <td>Sonya Frost</td>
                        <td>Software Engineer</td>
                        <td>Edinburgh</td>
                        <td>23</td>
                        <td>2008/12/13</td>
                        <td>$100,000</td>
                    </tr>

                    <tr>
                        <td>Quinn Flynn</td>
                        <td>Support Lead</td>
                        <td>Edinburgh</td>
                        <td>22</td>
                        <td>2013/03/03</td>
                        <td>$300,000</td>
                    </tr>



                    <tr>
                        <td>Doris Wilder</td>
                        <td>Sales Assistant</td>
                        <td>Sidney</td>
                        <td>23</td>
                        <td>2010/09/20</td>
                        <td>$85,600</td>
                    </tr>


                    <tr>
                        <td>Jennifer Chang</td>
                        <td>Regional Director</td>
                        <td>Singapore</td>
                        <td>28</td>
                        <td>2010/11/14</td>
                        <td>$357,650</td>
                    </tr>



                    <tr>
                        <td>Michelle House</td>
                        <td>Integration Specialist</td>
                        <td>Sidney</td>
                        <td>37</td>
                        <td>2011/06/02</td>
                        <td>$95,400</td>
                    </tr>


                    <tr>
                        <td>Timothy Mooney</td>
                        <td>Office Manager</td>
                        <td>London</td>
                        <td>37</td>
                        <td>2008/12/11</td>
                        <td>$136,200</td>
                    </tr>

                    <tr>
                        <td>Olivia Liang</td>
                        <td>Support Engineer</td>
                        <td>Singapore</td>
                        <td>64</td>
                        <td>2011/02/03</td>
                        <td>$234,500</td>
                    </tr>
                    <tr>
                        <td>Bruno Nash</td>
                        <td>Software Engineer</td>
                        <td>London</td>
                        <td>38</td>
                        <td>2011/05/03</td>
                        <td>$163,500</td>
                    </tr>


                    <tr>
                        <td>Finn Camacho</td>
                        <td>Support Engineer</td>
                        <td>San Francisco</td>
                        <td>47</td>
                        <td>2009/07/07</td>
                        <td>$87,500</td>
                    </tr>

                    <tr>
                        <td>Donna Snider</td>
                        <td>Customer Support</td>
                        <td>New York</td>
                        <td>27</td>
                        <td>2011/01/25</td>
                        <td>$112,000</td>
                    </tr>
                </tbody>
            </table>
        </div>
    </div>
</div>

我目前正以这种方式进行投影：

我需要这样的内容：