Bootstrap button bug

by svierkant

HTML

<link rel="stylesheet" href="https://cdn.datatables.net/v/bs-3.3.7/dt-1.10.18/b-1.5.6/b-colvis-1.5.6/r-2.2.2/sl-1.3.0/datatables.min.css">
<script src="https://cdn.datatables.net/v/bs-3.3.7/dt-1.10.18/b-1.5.6/b-colvis-1.5.6/r-2.2.2/sl-1.3.0/datatables.min.js"></script>
<table id="example" class="display" style="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>
        <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>Cedric Kelly</td>
                <td>Senior Javascript Developer</td>
                <td>Edinburgh</td>
                <td>22</td>
                <td>2012/03/29</td>
                <td>$433,060</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>
            ...

JavaScript

$(document).ready(function() {
    $('#example').DataTable( {
        dom: 'Bfrtip',
        buttons: [
            {
                extend: 'collection',
                text: 'Table control',
                buttons: [
                    {
                        text: 'Toggle start date',
                        action: function ( e, dt, node, config ) {
                            dt.column( -2 ).visible( ! dt.column( -2 ).visible() );
                        }
                    },
                    {
                        text: 'Toggle salary',
                        action: function ( e, dt, node, config ) {
                            dt.column( -1 ).visible( ! dt.column( -1 ).visible() );
                        }
                    },
                    {
                        collectionTitle: 'Visibility control',
                        extend: 'colvis'
                    }
                ]
            }
        ]
    } );
} );