[SO]-[descending numbers for datatables index column]

https://stackoverflow.com/questions/46336492/descending-numbers-for-datatables-index-column

HTML

<link rel="stylesheet" href="https://cdn.datatables.net/1.10.16/css/jquery.dataTables.min.css">
<script src="https://code.jquery.com/jquery-1.12.4.js"></script>
<script src="https://cdn.datatables.net/1.10.16/js/jquery.dataTables.min.js"></script>
<table id="example" class="display" cellspacing="0" width="100%">
  <thead>
    <tr>
      <th></th>
      <th>Name</th>
      <th>Position</th>
      <th>Office</th>
      <th>Age</th>
      <th>Salary</th>
    </tr>
  </thead>
  <tfoot>
    <tr>
      <th></th>
      <th>Name</th>
      <th>Position</th>
      <th>Office</th>
      <th>Age</th>
      <th>Salary</th>
    </tr>
  </tfoot>
  <tbody>
    <tr>
      <td></td>
      <td>Tiger Nixon</td>
      <td>System Architect</td>
      <td>Edinburgh</td>
      <td>61</td>
      <td>$320,800</td>
    </tr>
    <tr>
      <td></td>
      <td>Garrett Winters</td>
      <td>Accountant</td>
      <td>Tokyo</td>
      <td>63</td>
      <td>$170,750</td>
    </tr>
    <tr>
      <td></td>
      <td>Ashton Cox</td>
      <td>Junior Technical Author</td>
      <td>San Francisco</td>
      <td>66</td>
      <td>$86,000</td>
    </tr>
    <tr>
      <td></td>
      <td>Cedric Kelly</td>
      <td>Senior Javascript Developer</td>
      <td>Edinburgh</td>
      <td>22</td>
      <td>$433,060</td>
    </tr>
    <tr>
      <td></td>
      <td>Airi Satou</td>
      <td>Accountant</td>
      <td>Tokyo</td>
      <td>33</td>
      <td>$162,700</td>
    </tr>
    <tr>
      <td></td>
      <td>Brielle Williamson</td>
      <td>Integration Specialist</td>
      <td>New York</td>
      <td>61</td>
      <td>$372,000</td>
    </tr>
    <tr>
      <td></td>
      <td>Lael Greer</td>
      <td>Systems Administrator</td>
      <td>London</td>
      <td>21</td>
      <td>$103,500</td>
    </tr>
    <tr>
      <td></td>
      <td>Shad Decker</td>
      <td>Regional Director</td>
      <td>Edinburgh</td>
      <td>51</td>
      <td>$183,000</td>
    </tr>
    <tr>
      <td></td>
     ...

JavaScript

$(document).ready(function() {
  var t = $('#example').DataTable({
    "columnDefs": [{
      "searchable": false,
      "orderable": false,
      "targets": 0
    }],
    "order": [
      [1, 'desc']
    ]
  });

  t.on('order.dt search.dt', function() {
    var rows = t.rows().count();
    t.column(0, {
      search: 'applied',
      order: 'applied'
    }).nodes().each(function(cell, i) {
      cell.innerHTML = rows--;
    });
  }).draw();
});