asp.net-mvc-3 - ASP .Net MVC 3 不显眼的自定义客户端验证

Question

我已经使用 jquery 验证插件几年了，但这是我第一次尝试与 MVC 3 不显眼的验证混合。

有关事物客户端的信息散布在整个互联网上，很难找到任何足以向尚未使用它的人解释它的内容。我已经花了一个小时在 Google 上学习如何创建自定义客户端验证器的示例。

@Html.TextBoxFor(model => Model.CCPayment.CardNumber, new { @class = "textInput validateCreditCard", maxLength = "20" })

$(document).ready(function () {
      jQuery.validator.unobtrusive.adapters.add('validateCreditCard', {}, function (value, element) {
        alert('foo');
    });
});

如果我在 View 底部运行上面的代码，它绝对不会做任何事情。我什至尝试过 jquery.validator.addmethod() 仍然没有。从我的模型验证注释发出的所有客户端验证都可以正常工作。

<div class="ctrlHolder">
                <label>
                    <em>*</em>
                    Card Number:
                </label>
                @Html.TextBoxFor(model => Model.CCPayment.CardNumber, new { @class = "textInput validateCreditCard", maxLength = "20" })

                <p class="field-validation-valid formHint" data-valmsg-for="CCPayment.CardNumber"></p>
             </div>

Answer 1

这是您可以继续进行的方法。首先，您需要编写一个自定义验证器属性，以确保在服务器端强制执行验证。您可以使用本文中所述的 blog post :

public class CreditCardAttribute : ValidationAttribute, IClientValidatable
{
    private CardType _cardTypes;
    public CardType AcceptedCardTypes
    {
        get { return _cardTypes; }
        set { _cardTypes = value; }
    }

    public CreditCardAttribute()
    {
        _cardTypes = CardType.All;
    }

    public CreditCardAttribute(CardType AcceptedCardTypes)
    {
        _cardTypes = AcceptedCardTypes;
    }

    public override bool IsValid(object value)
    {
        var number = Convert.ToString(value);

        if (String.IsNullOrEmpty(number))
            return true;

        return IsValidType(number, _cardTypes) && IsValidNumber(number);
    }

    public override string FormatErrorMessage(string name)
    {
        return "The " + name + " field contains an invalid credit card number.";
    }

    public enum CardType
    {
        Unknown = 1,
        Visa = 2,
        MasterCard = 4,
        Amex = 8,
        Diners = 16,

        All = CardType.Visa | CardType.MasterCard | CardType.Amex | CardType.Diners,
        AllOrUnknown = CardType.Unknown | CardType.Visa | CardType.MasterCard | CardType.Amex | CardType.Diners
    }

    private bool IsValidType(string cardNumber, CardType cardType)
    {
        // Visa
        if (Regex.IsMatch(cardNumber, "^(4)")
            && ((cardType & CardType.Visa) != 0))
            return cardNumber.Length == 13 || cardNumber.Length == 16;

        // MasterCard
        if (Regex.IsMatch(cardNumber, "^(51|52|53|54|55)")
            && ((cardType & CardType.MasterCard) != 0))
            return cardNumber.Length == 16;

        // Amex
        if (Regex.IsMatch(cardNumber, "^(34|37)")
            && ((cardType & CardType.Amex) != 0))
            return cardNumber.Length == 15;

        // Diners
        if (Regex.IsMatch(cardNumber, "^(300|301|302|303|304|305|36|38)")
            && ((cardType & CardType.Diners) != 0))
            return cardNumber.Length == 14;

        //Unknown
        if ((cardType & CardType.Unknown) != 0)
            return true;

        return false;
    }

    private bool IsValidNumber(string number)
    {
        int[] DELTAS = new int[] { 0, 1, 2, 3, 4, -4, -3, -2, -1, 0 };
        int checksum = 0;
        char[] chars = number.ToCharArray();
        for (int i = chars.Length - 1; i > -1; i--)
        {
            int j = ((int)chars[i]) - 48;
            checksum += j;
            if (((i - chars.Length) % 2) == 0)
                checksum += DELTAS[j];
        }

        return ((checksum % 10) == 0);
    }

    public IEnumerable<ModelClientValidationRule> GetClientValidationRules(ModelMetadata metadata, ControllerContext context)
    {
        yield return new ModelClientValidationRule
        {
            ErrorMessage = this.ErrorMessage,
            ValidationType = "creditcard"
        };
    }
}

请注意，我已对其进行了修改以使其实现 IClientValidatable 界面并添加了 GetClientValidationRules 该方法仅使用与服务器端相同的错误消息进行客户端验证，并为此验证器提供唯一名称，该名称将由 jquery 非侵入式适配器使用。现在剩下的就是用这个属性装饰你的模型属性:

[CreditCard(ErrorMessage = "Please enter a valid credit card number")]
[Required]
public string CardNumber { get; set; }

在您看来:

<script src="@Url.Content("~/Scripts/jquery.validate.js")" type="text/javascript"></script>
<script src="@Url.Content("~/Scripts/jquery.validate.unobtrusive.js")" type="text/javascript"></script>
<script type="text/javascript">
    $(function () {
        jQuery.validator.unobtrusive.adapters.addBool('creditcard');
    });
</script>

@using (Html.BeginForm())
{
    @Html.TextBoxFor(x => x.CardNumber)
    @Html.ValidationMessageFor(x => x.CardNumber)
    <input type="submit" value="OK" />
}