不引人注目的ASP.NET MVC自定义验证

Question

我正在将ASP.NET MVC与Unobtrusive js结合使用，并且运行得很好，但是我想为以下内容设置验证规则：

我有两个值为“是”和“否”的下拉列表。 我也有一个文本框。

基于从下拉列表中选择的值，如果

“是”，我想验证是否在客户端和服务器端同时使用Unobtrusive输入了文本框值，以及是否

“否”而不是验证不起作用我的意思是，如果文本框值为空白或输入的任何值都可以，因为如果dropdownlist值为“否”，我不想存储该值，那么对该文本框不起作用。

请有人帮我解决这个问题。

我已经提到了很多stackoverflow问题和答案，那里的答案也相当不错，但是我无法将其作为解决方案。

我在布尔中得到下拉选择的值，即

 public bool IsTestUnit { get; set; }
    [RequiredIfUniTestIsYes("IsTestUnit == true", true, ErrorMessage = "Please Enter Test Unit Job Order Number ")]
        public long TestUnitJobOrder { get; set; }

我尝试过的代码：

 public class RequiredIfUniTestIsYes : ValidationAttribute, IClientValidatable
    {
        public RequiredIfUniTestIsYes()
        {

        }

        protected override ValidationResult IsValid(object value, ValidationContext validationContext)
        {
            var countryPropertyInfo = validationContext.ObjectInstance.GetType().GetProperty("IsTestUnit");
            var countryValue = countryPropertyInfo.GetValue(validationContext.ObjectInstance, null).ToString();
            if (countryValue == "True" && (value.ToString().Trim() == "" || Convert.ToInt32(value) == 0))
            {
                return new ValidationResult("Please Enter Unit Test Job Order Number");
            }

            return ValidationResult.Success;
        }

        public IEnumerable<ModelClientValidationRule> GetClientValidationRules(ModelMetadata metadata, ControllerContext context)
        {
            var rule = new ModelClientValidationRule();
            rule.ErrorMessage = "Please Enter Unit Test Job Order Number";
            rule.ValidationParameters.Add("istestunit", "true");
            rule.ValidationType = "isunittest";

            yield return rule;
        }
    }

Javascript：

$.validator.addMethod("isunittest", function (state, element, country) {
                 var country = $('#WorkOderDetailViewModel_IsTestUnit').val();
                     if (country == 'True' && state == '') {
                         return false;
                     }
                     return true;
                 });

             $.validator.unobtrusive.adapters.addSingleVal("isunittest", "true");

             (function ($) {
                 $.validator.addMethod('customRequire', function (value, element) {
                     // your validation logic here
                     return true; // true if valid, otherwise false 
                 });
                 $.validator.unobtrusive.adapters.add('customRequire');
             })(jQuery);

我只是复制粘贴代码而未更改名称，因此请忽略这些错误。

Answer 1

假设您渲染字段如下：

@Html.DropDownListFor(m => m.IsTestUnit,
new[] { true, false }.Select(b => new SelectListItem { Text = b ? "Yes" : "No", Value = b.ToString().ToLower() }),
new { id = "WorkOderDetailViewModel_IsTestUnit" })

@Html.TextBoxFor(m => m.TestUnitJobOrder)
@Html.ValidationMessageFor(m => m.TestUnitJobOrder)

模型属性声明为：

    public bool IsTestUnit { get; set; }

    [RequiredIfUniTestIsYes("IsTestUnit", ErrorMessage = "Please Enter Test Unit Job Order Number ")]
    public long? TestUnitJobOrder { get; set; }

您可以这样定义自定义验证器：

public class RequiredIfUniTestIsYes : ValidationAttribute, IClientValidatable
{
    private string _dependency;

    public RequiredIfUniTestIsYes(string dependency)
    {
        _dependency = dependency;
    }

    protected override ValidationResult IsValid(object value, ValidationContext validationContext)
    {
        var countryPropertyInfo = validationContext.ObjectInstance.GetType().GetProperty(_dependency);
        var countryValue = (bool)countryPropertyInfo.GetValue(validationContext.ObjectInstance, null);
        var number = default(long);
        if (countryValue && (value == null || !long.TryParse(value.ToString(), out number)))
        {
            return new ValidationResult("Please Enter Unit Test Job Order Number");
        }

        return ValidationResult.Success;
    }

    public IEnumerable<ModelClientValidationRule> GetClientValidationRules(ModelMetadata metadata, ControllerContext context)
    {
        var rule = new ModelClientValidationRule();
        rule.ErrorMessage = "Please Enter Unit Test Job Order Number";
        rule.ValidationParameters.Add("istestunit", "true");
        rule.ValidationType = "isunittest";

        yield return rule;
    }
}

并注册客户端无干扰的验证，如下所示：

    $.validator.unobtrusive.adapters.add("isunittest", ['istestunit'], function(options){
        options.rules['isunittest'] = options.params;
        options.messages['isunittest'] = options.message;
    });    
    $.validator.addMethod('isunittest', function (state, element, params) {
        var country = $('#WorkOderDetailViewModel_IsTestUnit').val();
        if (country == 'true' && state == '') {
            return false;
        }
        return true;
    });