Question

我正在尝试创建自己的客户端验证属性，该属性将在提交时验证表单的属性。我一直在参考以下Microsoft文档：https://docs.microsoft.com/en-us/aspnet/core/mvc/models/validation?view=aspnetcore-2.1#custom-validation。

我不确定如何将验证规则添加到jQuery的验证器对象。这是我所走的路：

我的ValidationAttribute如下

public class CannotEqualValue : ValidationAttribute, IClientModelValidator
{
    private readonly string _value;

    public CannotEqualValue(string value)
    {
        _value = value;
    }

    public void AddValidation(ClientModelValidationContext context)
    {
        if (context == null)
            throw new ArgumentNullException(nameof(context));

        MergeAttribute(context.Attributes, "data-val", "true");
        MergeAttribute(
            context.Attributes, "data-val-cannotbevalue", GetErrorMessage()); //???
        MergeAttribute(
            context.Attributes, "data-val-cannotbevalue-value", _value);      //???
    }

    protected override ValidationResult IsValid(
        object value, 
        ValidationContext validationContext)
    {
        var category = (Category) validationContext.ObjectInstance;

        if (category.Name == _value)
            return new ValidationResult(GetErrorMessage());

        return ValidationResult.Success;
    }

    private bool MergeAttribute(
        IDictionary<string, string> attributes, 
        string key, 
        string value)
    {
        if (attributes.ContainsKey(key)) return false;

        attributes.Add(key, value);
        return true;
    }

    private string GetErrorMessage()
    {
        return $"Name cannot be {_value}.";
    }
}

在类似的模型中使用ValidationAttribute

public class Category
{
    [Key]
    public int Id { get; set; }

    [Required(ErrorMessage = "Name is required and must not be empty.")]
    [StringLength(200, ErrorMessage = "Name must not exceed 200 characters.")]
    [CannotEqualValue("Red")]
    public string Name { get; set; }
}

我在页面中同时引用了jQuery验证和不打扰。

我不确定如何将规则添加到jQuery的验证器对象：

$.validator.addMethod("cannotbevalue",
    function(value, element, parameters) {
        //???
    });

$.validator.unobtrusive.adapters.add("cannotbevalue",
    [],
    function(options) {
        //???
    });

Answer 1

您在MergeAttribute(..)方法中的AddValidation()行代码是正确的，并将添加data-val-*属性以进行客户端验证。

您的脚本必须是

$.validator.addMethod("cannotbevalue", function(value, element, params) {
    if ($(element).val() == params.targetvalue) {
        return false;
    }
    return true;
});

$.validator.unobtrusive.adapters.add('cannotbevalue', ['value'], function(options) {
    options.rules['cannotbevalue'] = { targetvalue: options.params.value };
    options.messages['cannotbevalue'] = options.message;
});

使用IClientModelValidator在ASP.NET Core中带有参数的自定义客户端验证属性

1 个答案: