jQuery DataTables Checkboxes: RowGroup

Example for https://www.gyrocode.com/projects/jquery-datatables-checkboxes/

HTML

<link rel="stylesheet" href="https://cdn.datatables.net/v/dt/dt-1.10.16/rg-1.0.2/sl-1.2.4/datatables.min.css">
<script src="https://cdn.datatables.net/v/dt/dt-1.10.16/rg-1.0.2/sl-1.2.4/datatables.min.js"></script>
<link rel="stylesheet" href="//gyrocode.github.io/jquery-datatables-checkboxes/1.2.9/css/dataTables.checkboxes.css">
<script src="//gyrocode.github.io/jquery-datatables-checkboxes/1.2.9/js/dataTables.checkboxes.min.js"></script>
<h3><a target="_blank" href="https://www.gyrocode.com/projects/jquery-datatables-checkboxes/">jQuery DataTables Checkboxes:</a> <a target="_blank" href="https://www.gyrocode.com/projects/jquery-datatables-checkboxes/examples/integration/rowgroup/">RowGroup</a></h3>
    
<table id="example" class="display" cellspacing="0" width="100%">
   <thead>
      <tr>
        <th></th>
         <th></th>
         <th>Name</th>
         <th>Position</th>
         <th>Office</th>
         <th>Salary</th>
      </tr>
   </thead>
   <tfoot>
      <tr>
         <th></th> 
         <th></th>
         <th>Name</th>
         <th>Position</th>
         <th>Office</th>
         <th>Salary</th>
      </tr>
   </tfoot>
</table>

<hr><a target="_blank" href="https://www.gyrocode.com/projects/jquery-datatables-checkboxes/examples/integration/rowgroup//">See full article on Gyrocode.com</a>

CSS

td.details-control {
    background: url('https://cdn.rawgit.com/DataTables/DataTables/6c7ada53ebc228ea9bc28b1b216e793b1825d188/examples/resources/details_open.png') no-repeat center center;
    cursor: pointer;
}
tr.shown td.details-control {
    background: url('https://cdn.rawgit.com/DataTables/DataTables/6c7ada53ebc228ea9bc28b1b216e793b1825d188/examples/resources/details_close.png') no-repeat center center;
}

JavaScript

function format ( d ) {
    return 'The child row can contain any data you wish, including links, images, inner tables etc.';
}

$(document).ready(function (){
   var table = $('#example').DataTable({
      'ajax': 'https://gyrocode.github.io/files/jquery-datatables/objects.json',
      'orderFixed': [3, 'asc'],
      'rowGroup': {
         'dataSrc': 'office',
         'startRender': function(rows, group) {
            // Assign class name to all child rows
            var groupName = 'group-' + group.replace(/[^A-Za-z0-9]/g, '');
            var rowNodes = rows.nodes();
            rowNodes.to$().addClass(groupName);
            
            // Get selected checkboxes
            var checkboxesSelected = $('.dt-checkboxes:checked', rowNodes);
            
            // Parent checkbox is selected when all child checkboxes are selected
            var isSelected = (checkboxesSelected.length == rowNodes.length);
            
            return '<label><input type="checkbox" class="group-checkbox" data-group-name="' 
                   + groupName + '"' + (isSelected ? ' checked' : '') +'> ' + group + ' (' + rows.count() + ')</label>';
         }         
      },
      'columns': [
               {
            'className':      'details-control',
            'orderable':      false,
            'data':           null,
            'defaultContent': ''
         },
         {
            'data': 'id',
            'checkboxes': {
               'selectRow': true
            }
         },
         { 'data': 'name' },
         { 'data': 'position' },
         { 'data': 'office' },
         { 'data': 'salary' }
      ],
      'select': {
         'style': 'multi',
         'selector': 'td:not(:first-child)'
      },
      'order': [[2, 'asc']]
   } );
     
   // Handle click event on group checkbox
   $('#example').on('click', '.group-checkbox', function(e){
      // Get group class name
      var groupName = $(this).data('group-name');
      
      // Select all...