Hi, I've try to use remote method and not work. I donwload the complete Milk example and it don't work too.
This is the parameters <script type="text/javascript"> $(document).ready(function(){ var validator = $("#form1").validate({ rules: { codigo: { required: true, minlength: 3, remote: "valcodigo.php" } }, errorPlacement: function(error, element) { error.insertAfter(element); }, messages: { codigo: { remote: jQuery.format("El código {0} ya existe") } }, errorClass: "errores" }) }) </script>