DataTable: Hide the Show Entries dropdown but keep the Search box

If using Datatable > 1.1.0 then lengthChange option is what you need as below :

$('#example').dataTable( {
  "lengthChange": false
});

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 :)