You can find more information directly on this link: http://datatables.net/examples/basic_init/filter_only.html
$(document).ready(function() {
$('#example').dataTable({
"bPaginate": false,
"bLengthChange": false,
"bFilter": true,
"bInfo": false,
"bAutoWidth": false });
});
Hope that helps !
EDIT : If you are lazy, “bLengthChange”: false, is the one you need to change 🙂