public override void Process(TagHelperContext context, TagHelperOutput output)
{
Guard.ArgumentNotNull(context, nameof(context));
Guard.ArgumentNotNull(output, nameof(output));
string fullName = NameAndIdProvider.GetFullHtmlFieldName(ViewContext, For.Name);
string elementId = NameAndIdProvider.CreateSanitizedId(ViewContext, fullName, TagHelperConstants.ValidationAnchorSeparator);
if (string.IsNullOrWhiteSpace(elementId))
{
throw new InvalidOperationException("Unable to determine form ID string");
}
output.Attributes.Add("name", $"{TagHelperConstants.ValidationAnchorPrefix}-{elementId}");
output.Attributes.Add("class", "form-anchor");
}
public virtual TagBuilder GenerateSelect(
ViewContext viewContext,
ModelExplorer modelExplorer,
string optionLabel,
string expression,
IEnumerable <GdsSelectListItem> selectList,
ICollection <string> currentValues,
bool allowMultiple,
object htmlAttributes)
{
if (viewContext == null)
{
throw new ArgumentNullException(nameof(viewContext));
}
var fullName = NameAndIdProvider.GetFullHtmlFieldName(viewContext, expression);
var htmlAttributeDictionary = GetHtmlAttributeDictionaryOrNull(htmlAttributes);
if (!IsFullNameValid(fullName, htmlAttributeDictionary))
{
throw new ArgumentNullException("FormatHtmlGenerator_FieldNameCannotBeNullOrEmpty", nameof(expression));
////throw new ArgumentException(
//// Resources.FormatHtmlGenerator_FieldNameCannotBeNullOrEmpty(
//// typeof(IHtmlHelper).FullName,
//// nameof(IHtmlHelper.Editor),
//// typeof(IHtmlHelper<>).FullName,
//// nameof(IHtmlHelper<object>.EditorFor),
//// "htmlFieldName"),
//// nameof(expression));
}
// If we got a null selectList, try to use ViewData to get the list of items.
if (selectList == null)
{
selectList = GetSelectListItems(viewContext, expression);
}
modelExplorer = modelExplorer ??
ExpressionMetadataProvider.FromStringExpression(expression, viewContext.ViewData, _metadataProvider);
// Convert each ListItem to an <option> tag and wrap them with <optgroup> if requested.
var listItemBuilder = GenerateGroupsAndOptions(optionLabel, selectList, currentValues);
var tagBuilder = new TagBuilder("select");
tagBuilder.InnerHtml.SetHtmlContent(listItemBuilder);
tagBuilder.MergeAttributes(htmlAttributeDictionary);
NameAndIdProvider.GenerateId(viewContext, tagBuilder, fullName, IdAttributeDotReplacement);
if (!string.IsNullOrEmpty(fullName))
{
tagBuilder.MergeAttribute("name", fullName, replaceExisting: true);
}
if (allowMultiple)
{
tagBuilder.MergeAttribute("multiple", "multiple");
}
// If there are any errors for a named field, we add the css attribute.
if (viewContext.ViewData.ModelState.TryGetValue(fullName, out var entry))
{
if (entry.Errors.Count > 0)
{
tagBuilder.AddCssClass(HtmlHelper.ValidationInputCssClassName);
}
}
AddValidationAttributes(viewContext, tagBuilder, modelExplorer, expression);
return(tagBuilder);
}
