internal static void TextAreaHelper(
HtmlHelper htmlHelper, XcstWriter output, ModelMetadata metadata, string name, IDictionary <string, object> rowsAndColumns,
HtmlAttribs?htmlAttributes, string?innerHtmlPrefix = null)
{
string fullName = htmlHelper.ViewData.TemplateInfo.GetFullHtmlFieldName(name);
if (String.IsNullOrEmpty(fullName))
{
throw new ArgumentNullException(nameof(name));
}
output.WriteStartElement("textarea");
HtmlAttributeHelper.WriteId(fullName, output);
output.WriteAttributeString("name", fullName);
HtmlAttributeHelper.WriteAttributes(rowsAndColumns, output);
bool explicitRowsAndCols = rowsAndColumns != implicitRowsAndColumns;
// If there are any errors for a named field, we add the css attribute.
string?cssClass = (htmlHelper.ViewData.ModelState.TryGetValue(fullName, out ModelState modelState) &&
modelState.Errors.Count > 0) ? HtmlHelper.ValidationInputCssClassName : null;
HtmlAttributeHelper.WriteClass(cssClass, htmlAttributes, output);
HtmlAttributeHelper.WriteAttributes(htmlHelper.GetUnobtrusiveValidationAttributes(name, metadata), output);
// name cannnot be overridden, and class was already written
// explicit rows and cols cannot be overridden
HtmlAttributeHelper.WriteAttributes(
htmlAttributes,
output,
excludeFn: n => n == "name" || n == "class" || (explicitRowsAndCols && (n == "rows" || n == "cols")));
string?value;
if (modelState?.Value != null)
{
value = modelState.Value.AttemptedValue;
}
else if (metadata.Model != null)
{
value = Convert.ToString(metadata.Model, CultureInfo.CurrentCulture);
}
else
{
value = String.Empty;
}
// The first newline is always trimmed when a TextArea is rendered, so we add an extra one
// in case the value being rendered is something like "\r\nHello".
output.WriteString((innerHtmlPrefix ?? Environment.NewLine) + value);
output.WriteEndElement();
}
static void SelectInternal(
HtmlHelper htmlHelper, XcstWriter output, ModelMetadata?metadata, string?optionLabel, string name, IEnumerable <SelectListItem>?selectList,
bool allowMultiple, HtmlAttribs?htmlAttributes)
{
ViewDataDictionary viewData = htmlHelper.ViewData;
string fullName = viewData.TemplateInfo.GetFullHtmlFieldName(name);
if (String.IsNullOrEmpty(fullName))
{
throw new ArgumentNullException(nameof(name));
}
bool usedViewData = false;
// If we got a null selectList, try to use ViewData to get the list of items.
if (selectList is null)
{
selectList = GetSelectData(htmlHelper, name);
usedViewData = true;
}
object?defaultValue = (allowMultiple) ?
htmlHelper.GetModelStateValue(fullName, typeof(string[]))
: htmlHelper.GetModelStateValue(fullName, typeof(string));
// If we haven't already used ViewData to get the entire list of items then we need to
// use the ViewData-supplied value before using the parameter-supplied value.
if (defaultValue is null)
{
if (metadata is null)
{
if (!usedViewData &&
!String.IsNullOrEmpty(name))
{
defaultValue = viewData.Eval(name);
}
}
else
{
defaultValue = metadata.Model;
}
}
if (defaultValue != null)
{
selectList = GetSelectListWithDefaultValue(selectList, defaultValue, allowMultiple);
}
output.WriteStartElement("select");
HtmlAttributeHelper.WriteId(fullName, output);
output.WriteAttributeString("name", fullName);
HtmlAttributeHelper.WriteBoolean("multiple", allowMultiple, output);
// If there are any errors for a named field, we add the css attribute.
string?cssClass = (viewData.ModelState.TryGetValue(fullName, out ModelState modelState) &&
modelState.Errors.Count > 0) ? HtmlHelper.ValidationInputCssClassName : null;
var validationAttribs = htmlHelper.GetUnobtrusiveValidationAttributes(
name, metadata
#if !ASPNETMVC
, excludeMinMaxLength: !allowMultiple
#endif
);
HtmlAttributeHelper.WriteClass(cssClass, htmlAttributes, output);
HtmlAttributeHelper.WriteAttributes(validationAttribs, output);
// name cannnot be overridden, and class was already written
HtmlAttributeHelper.WriteAttributes(htmlAttributes, output, excludeFn: n => n == "name" || n == "class");
WriteOptions(optionLabel, selectList, output);
output.WriteEndElement(); // </select>
}