function isNumber(evt) { evt = (evt) ? evt : window.event; var charCode = (evt.which) ? evt.which : evt.keyCode; if (charCode > 31 && (charCode < 48 || charCode > 57)) { return false; } return true; } $(document).ready(function(){ $("#postoperation").validate({ rules: { spam_score : { required: true } }, messages: { spam_score: { required:"Enter the spam score" } } }); });