DataTables - Filtering

HTML

<link rel="stylesheet" href="https://cdn.datatables.net/1.10.7/css/jquery.dataTables.css">
<script src="https://cdn.datatables.net/1.10.7/js/jquery.dataTables.min.js"></script>
<div class="ticket-filtering"></div>
<hr>
    
<table id="example" class="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>Name</th>
            <th>Position</th>
            <th>Office</th>
            <th>Age</th>
            <th>Start date</th>
            <th>Salary</th>
        </tr>
    </tfoot>
    <tbody>
        <tr>
            <td>Tiger Nixon</td>
            <td>System Architect</td>
            <td>Edinburgh</td>
            <td>61</td>
            <td>2011/04/25</td>
            <td>$320,800</td>
        </tr>
        <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>Ashton Cox</td>
            <td>Junior Technical Author</td>
            <td>San Francisco</td>
            <td>66</td>
            <td>2009/01/12</td>
            <td>$86,000</td>
        </tr>
        <tr>
            <td>Bradley Greer</td>
            <td>Software Engineer</td>
            <td>London</td>
            <td>41</td>
            <td>2012/10/13</td>
            <td>$132,000</td>
        </tr>
        <tr>
            <td>Dai Rios</td>
            <td>Personnel Lead</td>
            <td>Edinburgh</td>
            <td>35</td>
            <td>2012/09/26</td>
            <td>$217,500</td>
        </tr>
        <tr>
            <td>Jenette Caldwell</td>
            <td>Development Lead</td>
            <td>New York</td>
            <td>30</td>
            <td>2011/09/03</td>
     ...

JavaScript

$(document).ready(function (){
    var table = $('#example').DataTable({
       "columnDefs": [
          {
             "render": function ( data, type, row ) {
                if(type === 'display'){
                   data = '<span class="client-data"> ' + data + ' </span>' 
                      + '<span class="priority-data"> ' + row[1] + ' </span>' 
                      + '<span class="status-data"> ' + row[2] + ' </span>' 
                      + '<div class="subject-data"> ' + row[3] + ' </div>'
                      + '<i class="fa fa-user"></i><span class="agent-data"> ' + row[4] + ' </span>'
                      + '<span class="date-data"> ' + row[5] + ' </span>';
                }
                 
                return data;
             },
             "targets": 0
          },        
          { "visible": false, "targets": [ 1,2,3,4,5 ]}
       ],
       initComplete: function () {
          this.api().columns([0,1,2]).every( function () {
            var column = this;
            var select = $('<select><option value=""></option></select>')
                .appendTo( ".ticket-filtering" )
                .on( 'change', function () {
                    var val = $.fn.dataTable.util.escapeRegex(
                        $(this).val()
                    );
                    column
                        .search( val ? '^'+val+'$' : '', true, false )
                        .draw();
                } );

            column.data().unique().sort().each( function ( d, j ) {
                select.append( '<option value="'+d+'">'+d+'</option>' )
            } );
         } );
       }
    });
});