introduccionPHP/documentoidjs.html at master · Lainier/introduccionPHP · GitHub

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<head>
    <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
    <script type="text/javascript" src="http://ajax.aspnetcdn.com/ajax/jquery.validate/1.15.0/jquery.validate.js"></script>
    <script type="text/javascript" src="http://ajax.aspnetcdn.com/ajax/jquery.validate/1.15.0/localization/messages_es.js"></script>
</head>

<form method="post" id="selector" action="leerFicha.php" novalidate>
<label for="cnif">NIF (opcional)</label>
<input id="cnif" name="nif"><br>
<input type="submit">
<input type="reset">
</form>

<script>

    function esNIF(value, element) {
                var referencia = 'TRWAGMYFPDXBNJZSQVHLCKE';
                var letra = value.substring(value.length - 1);
                var numero = parseInt(value.substring(0, value.length - 1));
                if (referencia.charAt(numero % 23) === letra) {
                    return true;
                } else {
                    return false;
                }
            }

jQuery.validator.addMethod("esnif", esNIF, "No es un NIF válido");

$("#selector").validate({

                submitHandler: function (form) {
                  form.submit();
                },

                 rules: {
                 nif: {
                 esnif: true
                 }
                }
            });

</script>