我目前正在构建一个 MVC4 项目,该项目通过数据注释使用不显眼的验证。
我有一个特定字段“邮政编码”,它既是[必填],又附加了一个[正则表达式]验证器。 问题是,只有选择特定国家/地区时才应验证此正则表达式。 (该国家/地区将成为默认值,我们可以假设几乎在所有情况下都会使用该值)
现在我需要某种方法来在选择不同的国家/地区时禁用此正则表达式验证,同时保持所需的验证器处于事件状态。
我发现的几乎所有解决方案都使用 jQuery.validator.defaults.ignore 过滤器,但这会禁用该项目上的两个验证器。
关于如何最好地解决这个问题有什么想法吗?
编辑:小代码片段以显示其工作原理。
[Required]
[RegularExpression("^[1-9]\\d{3} ?[a-zA-Z]{2}$"] //Should only be verified if Country == "The Netherlands"
string PostalCode{get;set;}
[Required]
string Country {get;set;}
最佳答案
最后我根据这篇博文编写了自己的ValidationAttribute:http://thewayofcode.wordpress.com/2012/01/18/custom-unobtrusive-jquery-validation-with-data-annotations-in-mvc-3/ 这是一个优雅的解决方案,所需的工作量比我预期的要少。
编辑:根据要求,我提供了我自己创建的解决方案:
// DependentRegularExpressionAttribute.cs
/// <summary>
/// Only performs a regular expression validation if a specified other property meets a validation requirement
/// </summary>
[AttributeUsage(AttributeTargets.Property, AllowMultiple = true)]
public class DependentRegularExpressionAttribute : ValidationAttribute, IClientValidatable
{
private readonly Regex _regex;
private readonly string _otherPropertyName;
private readonly Regex _otherPropertyRegex;
public DependentRegularExpressionAttribute(string regex, string otherPropertyName, string otherPropertyRegex)
{
_regex = new Regex(regex);
_otherPropertyName = otherPropertyName;
_otherPropertyRegex = new Regex(otherPropertyRegex);
}
/// <summary>
/// Format the error message filling in the name of the property to validate and the reference one.
/// </summary>
/// <param name="name">The name of the property to validate</param>
/// <returns>The formatted error message</returns>
public override string FormatErrorMessage(string name)
{
return string.Format(ErrorMessageString, name, _regex, _otherPropertyName, _otherPropertyRegex);
}
protected override ValidationResult IsValid(object value, ValidationContext validationContext)
{
var validationResult = ValidationResult.Success;
if (value == null || String.IsNullOrEmpty(value as string))
return validationResult;
// Using reflection we can get a reference to the other property
var otherPropertyInfo = validationContext.ObjectType.GetProperty(_otherPropertyName);
var otherPropertyValue = otherPropertyInfo.GetValue(validationContext.ObjectInstance, null);
if (otherPropertyValue == null || String.IsNullOrEmpty(otherPropertyValue as string))
return validationResult;
if (_otherPropertyRegex.IsMatch(otherPropertyValue.ToString()))
{
if (!_regex.IsMatch(value.ToString()))
validationResult = new ValidationResult(ErrorMessage);
}
return validationResult;
}
#region IClientValidatable Members
/// <summary>
///
/// </summary>
/// <param name="metadata"></param>
/// <param name="context"></param>
/// <returns></returns>
public IEnumerable<ModelClientValidationRule> GetClientValidationRules(ModelMetadata metadata, ControllerContext context)
{
string errorMessage = FormatErrorMessage(metadata.DisplayName ?? metadata.PropertyName);
// The value we set here are needed by the jQuery adapter
var dependentRegexRule = new ModelClientValidationRule
{
ErrorMessage = errorMessage,
ValidationType = "dependentregex"
};
//"otherpropertyname" is the name of the jQuery parameter for the adapter, must be LOWERCASE!
dependentRegexRule.ValidationParameters.Add("otherpropertyname", _otherPropertyName);
dependentRegexRule.ValidationParameters.Add("regex", _regex);
dependentRegexRule.ValidationParameters.Add("otherpropertyregex", _otherPropertyRegex);
yield return dependentRegexRule;
}
#endregion
}
// customvalidation.js
$.validator.addMethod("dependentregex", function (value, element, params) {
var regex = new RegExp(params[0]);
var otherElement = document.getElementById(params[1]);
var otherElementRegex = new RegExp(params[2]);
if (!value || !otherElement.value)
return true;
if (otherElementRegex.test(otherElement.value)) {
if (!regex.test(element.value))
return false;
}
return true;
});
$.validator.unobtrusive.adapters.add("dependentregex", ["regex", "otherpropertyname", "otherpropertyregex"], function(options) {
options.rules["dependentregex"] = [options.params.regex,
options.params.otherpropertyname,
options.params.otherpropertyregex];
options.messages["dependentregex"] = options.message;
});
在我的 View 模型中,我执行以下操作:
[Display(Name = "Customer_PostalCode", ResourceType = typeof(Resources.DisplayNames))]
[DependentRegularExpression("^[1-9]\\d{3} ?[a-zA-Z]{2}$", "CorrespondenceCountry", "Nederland", ErrorMessageResourceType = typeof(Resources.Validation), ErrorMessageResourceName = "Customer_PostalCode")] //"Nederland" is a regular expression in this case
[Required(ErrorMessageResourceType = typeof(Resources.Validation), ErrorMessageResourceName = "Shared_RequiredField")]
public string CorrespondenceZipCode { get; set; }
最后,customvalidation.js 方法基本上执行与 C# 代码完全相同的操作。有关一切功能的详细说明可以在我引用的博文中找到
关于asp.net-mvc - MVC 禁用特定验证器的不引人注目的验证,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/16032042/