jQuery Validation Additional Method CNH - Carteira Nacional de Habilitação - Carteira de Motorista

gistfile1.js

$.validator.addMethod('CNH', function(value, element) {
  var ret,
      cnh   = value,
      firstChar = cnh.charAt(0);

  if (cnh.replace(/[^\d]/g, '').length === 11 && firstChar.repeat(11) !== cnh) {

    var dsc = 0;

    for (var i = 0, j = 9, v = 0; i < 9; ++i, --j) {
      v += +(cnh.charAt(i) * j);
    }

    var vl1 = v % 11;
    if (vl1 >= 10) {
      vl1 = 0;
      dsc = 2;
    }

    for (i = 0, j = 1, v = 0; i < 9; ++i, ++j) {
      v += +(cnh.charAt(i) * j);
    }

    var x = v % 11,
      vl2 = (x >= 10) ? 0 : x - dsc;

    ret = '' + vl1 + vl2 === cnh.substr(-2);

  }

  if (ret !== true) return false;

  return true;

}, 'CNH inválida');