public static IHtmlContent Generate(FormTagHelperBase tagHelper)
{
var builder = new TagBuilder("div")
{
TagRenderMode = TagRenderMode.Normal
};
builder.AddCssClass("invalid-feedback");
builder.MergeAttribute("data-valmsg-for", tagHelper.Id);
builder.MergeAttribute("data-valmsg-replace", "true");
// Error Message
var modelState = tagHelper.ViewContext.ViewData.ModelState.FirstOrDefault(k => k.Key == tagHelper.For.Metadata.PropertyName).Value;
if (modelState != null && modelState.ValidationState == ModelValidationState.Invalid)
{
builder.AddCssClass("field-validation-error");
builder.InnerHtml.Append(modelState.Errors.FirstOrDefault()?.ErrorMessage);
}
else
{
builder.AddCssClass("field-validation-valid");
}
return(builder);
}
/// <summary>
/// Checks if the bounded property of the tag helper is valid on a POST request.
/// </summary>
/// <param name="tagHelper">The tag helper.</param>
/// <returns>Returns true if the bounded property is valid,</returns>
/// <remarks>If no property is bound to the tag helper or the request is not a POST, the result is true.</remarks>
public static bool IsPostValid(this FormTagHelperBase tagHelper)
{
if (tagHelper.For != null && tagHelper.ViewContext.HttpContext.Request.Method == "POST")
{
return(tagHelper.ViewContext.ViewData.ModelState.GetFieldValidationState(tagHelper.For.Metadata.PropertyName) == ModelValidationState.Valid);
}
return(true);
}
/// <summary>
/// Checks if the bounded property of the tag helper is valid.
/// </summary>
/// <param name="tagHelper">The tag helper.</param>
/// <returns>Returns true if the bounded property is valid,</returns>
/// <remarks>If no property is bound to the tag helper, the result is true.</remarks>
public static bool IsValid(this FormTagHelperBase tagHelper)
{
if (tagHelper.For != null)
{
return(tagHelper.ViewContext.ViewData.ModelState.GetFieldValidationState(tagHelper.For.Metadata.PropertyName) == ModelValidationState.Valid);
}
return(true);
}
