private static MvcHtmlString ValidationMessageHelper(this HtmlHelper htmlHelper, ModelMetadata modelMetadata, string expression, string validationMessage, IDictionary <string, object> htmlAttributes)
{
//string modelName = htmlHelper.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(expression);
string modelName = expression;
//FormContext formContext = htmlHelper.ViewContext.GetFormContextForClientValidation();
FormContext formContext = null;
if (!htmlHelper.ViewData.ModelState.ContainsKey(modelName) && formContext == null)
{
return(null);
}
ModelState modelState = htmlHelper.ViewData.ModelState[modelName];
ModelErrorCollection modelErrors = (modelState == null) ? null : modelState.Errors;
ModelError modelError = (((modelErrors == null) || (modelErrors.Count == 0)) ? null : modelErrors.FirstOrDefault(m => !String.IsNullOrEmpty(m.ErrorMessage)) ?? modelErrors[0]);
if (modelError == null && formContext == null)
{
return(null);
}
TagBuilder builder = new TagBuilder("span");
builder.MergeAttributes(htmlAttributes);
builder.AddCssClass((modelError != null) ? HtmlHelper.ValidationMessageCssClassName : HtmlHelper.ValidationMessageValidCssClassName);
if (!String.IsNullOrEmpty(validationMessage))
{
builder.SetInnerText(validationMessage);
}
else if (modelError != null)
{
builder.SetInnerText(GetUserErrorMessageOrDefault(htmlHelper.ViewContext.HttpContext, modelError, modelState));
}
if (formContext != null)
{
bool replaceValidationMessageContents = String.IsNullOrEmpty(validationMessage);
if (htmlHelper.ViewContext.UnobtrusiveJavaScriptEnabled)
{
builder.MergeAttribute("data-valmsg-for", modelName);
builder.MergeAttribute("data-valmsg-replace", replaceValidationMessageContents.ToString().ToLowerInvariant());
}
else
{
FieldValidationMetadata fieldMetadata = ApplyFieldValidationMetadata(htmlHelper, modelMetadata, modelName);
// rules will already have been written to the metadata object
fieldMetadata.ReplaceValidationMessageContents = replaceValidationMessageContents; // only replace contents if no explicit message was specified
// client validation always requires an ID
builder.GenerateId(modelName + "_validationMessage");
fieldMetadata.ValidationMessageId = builder.Attributes["id"];
}
}
return(builder.ToMvcHtmlString(TagRenderMode.Normal));
}
private static FieldValidationMetadata ApplyFieldValidationMetadata(HtmlHelper htmlHelper, ModelMetadata modelMetadata, string modelName)
{
FormContext formContext = htmlHelper.ViewContext.FormContext;
FieldValidationMetadata fieldMetadata = formContext.GetValidationMetadataForField(modelName, true /* createIfNotFound */);
// write rules to context object
//IEnumerable<ModelValidator> validators = ModelValidatorProviders.Providers.GetValidators(modelMetadata, htmlHelper.ViewContext);
//foreach (ModelClientValidationRule rule in validators.SelectMany(v => v.GetClientValidationRules()))
//{
// fieldMetadata.ValidationRules.Add(rule);
//}
return(fieldMetadata);
}
/// <summary>Gets validation metadata for field.</summary>
///
/// <exception>Thrown when a parameter cannot be null or empty error condition occurs.</exception>
///
/// <param name="fieldName"> Name of the field.</param>
/// <param name="createIfNotFound">true to create if not found.</param>
///
/// <returns>The validation metadata for field.</returns>
public FieldValidationMetadata GetValidationMetadataForField(string fieldName, bool createIfNotFound)
{
if (String.IsNullOrEmpty(fieldName)) {
throw Error.ParameterCannotBeNullOrEmpty("fieldName");
}
FieldValidationMetadata metadata;
if (!FieldValidators.TryGetValue(fieldName, out metadata)) {
if (createIfNotFound) {
metadata = new FieldValidationMetadata()
{
FieldName = fieldName
};
FieldValidators[fieldName] = metadata;
}
}
return metadata;
}
/// <summary>Gets validation metadata for field.</summary>
///
/// <exception>Thrown when a parameter cannot be null or empty error condition occurs.</exception>
///
/// <param name="fieldName"> Name of the field.</param>
/// <param name="createIfNotFound">true to create if not found.</param>
///
/// <returns>The validation metadata for field.</returns>
public FieldValidationMetadata GetValidationMetadataForField(string fieldName, bool createIfNotFound)
{
if (String.IsNullOrEmpty(fieldName))
{
throw Error.ParameterCannotBeNullOrEmpty("fieldName");
}
FieldValidationMetadata metadata;
if (!FieldValidators.TryGetValue(fieldName, out metadata))
{
if (createIfNotFound)
{
metadata = new FieldValidationMetadata()
{
FieldName = fieldName
};
FieldValidators[fieldName] = metadata;
}
}
return(metadata);
}
