Fix
$('#tabel').DataTable({
"lengthMenu": [ [20, 50, 100, -1], [20, 50, 100, "Semua"] ],
"ordering" : false,
initComplete: function () {
this.api().columns().every( function () {
var column = this;
var select = $('<select class="filter_select"><option value="">Tanpa Filter</option></select>')
.appendTo( $(column.header()).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>' )
} );
} );
}
} );
$('.filter_select').select2();