datatables filter column

1$(document).ready(function() {
2    // Setup - add a text input to each footer cell
3    $('#example thead tr').clone(true).appendTo( '#example thead' );
4    $('#example thead tr:eq(1) th').each( function (i) {
5        var title = $(this).text();
6        $(this).html( '<input type="text" placeholder="Search '+title+'" />' );
7 
8        $( 'input', this ).on( 'keyup change', function () {
9            if ( table.column(i).search() !== this.value ) {
10                table
11                    .column(i)
12                    .search( this.value )
13                    .draw();
14            }
15        } );
16    } );
17 
18    var table = $('#example').DataTable( {
19        orderCellsTop: true,
20        fixedHeader: true
21    } );
22} );
23