i want to use individual column search with select input in datatable parellaly i want use pdf

sairamgh

here is the code but both pdf and individual column search using select input not working please help me

$('#myTable').dataTable({
dom: 'Bfrtip',
buttons: [

          'excelHtml5',

          'pdfHtml5'
      ]
  });. initComplete: function () {
        this.api().columns().every( function () {
            var column = this;
            var select = $('<select><option value=""></option></select>')
                .appendTo( $(column.footer()).empty() )
                .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>' )
            } );
        } );
    }