Serverside; typing in 1 searchbox fires as many ajaxcalls as there are columns!

Terradon

I have added searchboxes in tfooter, but typing just one character in 1 searchbox, fires ajaxcalls for every column??
Somehow it does not make any differences between all the searchboxes. In my case it fires 5 ajaxcalls at once.

$("#mijnlogboek").DataTable({
        "processing": true,
        "serverSide": true,
        "lengthMenu": [[10,50,200,500,-1], [10,50,200,500,"Alles"]],
        "pagingType": "full_numbers",
        language: {url: '//cdn.datatables.net/plug-ins/f2c75b7247b/i18n/Dutch.json'},
        "ajax": "jq_datatables/mijnlogboek.php?playerID=1"
    })

  $('#mijnlogboek tfoot th').each( function () {
        var title = $('#mijnlogboek thead th').eq( $(this).index() ).text();
        $(this).html( '<input type="text" placeholder="Zoek '+title+'" />' );
    } );
  // DataTable
    var table = $('#mijnlogboek').DataTable();
 
    // Apply the search
    table.columns().eq( 0 ).each( function ( colIdx ) {
        $( 'input', table.column( colIdx ).footer() ).on( 'keyup change', function () {
            table
                .column( colIdx )
                .search( this.value )
                .draw();
        } );

The table:

<table id="mijnlogboek" class="Xdisplay">
        <thead>
            <tr>
                <th>datum tijd</th>
                <th>actie</th>
                <th>partij</th>
                <th>tegenstander</th>
                <th>beschrijving</th>
            </tr>
        </thead>
        
        <tfoot>
            <tr>
                 <th>datum tijd</th>
                <th>actie</th>
                <th>partij</th>
                <th>tegenstander</th>
                <th>beschrijving</th>
            </tr>
        </tfoot>
 

    </table>

According to Firebug, it fires 5 ajaxcalls and for each columns it mentions the searchvalue, i typed in just 1 searchbox.

Apperently i am overseeing something but what?
Thanks in advance for any help!

Terradon

I think the problem lays in:
table.column( colIdx )
coll dx seems to identify in which column i search? because if fires 5 ajaxcalls now and adds the searchterm to each column, instead to just 1 column.
But how?