Если вам нужна проверка на стороне клиента в дополнение к проверке модели на сервере, я думаю, что лучший способ - это настраиваемый атрибут проверки (как предложил Ярослав). Я включил здесь источник того, который я использую.
Пользовательский атрибут:
public class RequiredIfAttribute : DependentPropertyAttribute
{
private readonly RequiredAttribute innerAttribute = new RequiredAttribute();
public object TargetValue { get; set; }
public RequiredIfAttribute(string dependentProperty, object targetValue) : base(dependentProperty)
{
TargetValue = targetValue;
}
protected override ValidationResult IsValid(object value, ValidationContext validationContext)
{
// get a reference to the property this validation depends upon
var containerType = validationContext.ObjectInstance.GetType();
var field = containerType.GetProperty(DependentProperty);
if (field != null)
{
// get the value of the dependent property
var dependentvalue = field.GetValue(validationContext.ObjectInstance, null);
// compare the value against the target value
if ((dependentvalue == null && TargetValue == null) ||
(dependentvalue != null && dependentvalue.Equals(TargetValue)))
{
// match => means we should try validating this field
if (!innerAttribute.IsValid(value))
// validation failed - return an error
return new ValidationResult(ErrorMessage, new[] { validationContext.MemberName });
}
}
return ValidationResult.Success;
}
public override IEnumerable<ModelClientValidationRule> GetClientValidationRules(ModelMetadata metadata, ControllerContext context)
{
var rule = new ModelClientValidationRule
{
ErrorMessage = FormatErrorMessage(metadata.GetDisplayName()),
ValidationType = "requiredif"
};
var depProp = BuildDependentPropertyId(DependentProperty, metadata, context as ViewContext);
// find the value on the control we depend on;
// if it's a bool, format it javascript style
// (the default is True or False!)
var targetValue = (TargetValue ?? "").ToString();
if (TargetValue != null)
if (TargetValue is bool)
targetValue = targetValue.ToLower();
rule.ValidationParameters.Add("dependentproperty", depProp);
rule.ValidationParameters.Add("targetvalue", targetValue);
yield return rule;
}
}
Расширение проверки Jquery:
$.validator.unobtrusive.adapters.add('requiredif', ['dependentproperty', 'targetvalue'], function (options) {
options.rules['requiredif'] = {
dependentproperty: options.params['dependentproperty'],
targetvalue: options.params['targetvalue']
};
options.messages['requiredif'] = options.message;
});
$.validator.addMethod('requiredif',
function (value, element, parameters) {
var id = '#' + parameters['dependentproperty'];
// get the target value (as a string,
// as that's what actual value will be)
var targetvalue = parameters['targetvalue'];
targetvalue = (targetvalue == null ? '' : targetvalue).toString();
// get the actual value of the target control
var actualvalue = getControlValue(id);
// if the condition is true, reuse the existing
// required field validator functionality
if (targetvalue === actualvalue) {
return $.validator.methods.required.call(this, value, element, parameters);
}
return true;
}
);
Украшение недвижимости атрибутом:
[Required]
public bool IsEmailGiftCertificate { get; set; }
[RequiredIf("IsEmailGiftCertificate", true, ErrorMessage = "Please provide Your Email.")]
public string YourEmail { get; set; }