public static MvcHtmlString CheckBoxListFor <TModel, TProperty>(this HtmlHelper <TModel> htmlHelper, Expression <Func <TModel, TProperty> > expression, IEnumerable <SelectListItem> selectList, string optionLabel, object htmlAttributes, ColNumber cols)
{
return(CheckBoxListFor(htmlHelper, expression, selectList, optionLabel, HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes), cols));
}
public static MvcHtmlString CheckBoxListFor <TModel, TProperty>(this HtmlHelper <TModel> htmlHelper, Expression <Func <TModel, TProperty> > expression, IEnumerable <SelectListItem> selectList, string optionLabel, ColNumber cols)
{
return(CheckBoxListFor(htmlHelper, expression, selectList, optionLabel, null /* htmlAttributes */, cols));
}
public static StringBuilder BuildItems(string optionLabel, IEnumerable <SelectListItem> selectList, IDictionary <string, object> htmlAttributes, string fullName, ColNumber cols)
{
if (cols == ColNumber.twoCols)
{
var listItemBuilder = new StringBuilder();
// Make optionLabel the first item that gets rendered.
listItemBuilder.AppendLine("<div class=\"row\">");
listItemBuilder.AppendLine("<div class=\"col-md-6\">");
var selectListItems = selectList as SelectListItem[] ?? selectList.ToArray();
int length = selectListItems.Length;
double halfLength = ((double)length) / 2.0;
int index = 0;
if (optionLabel != null)
{
listItemBuilder.AppendLine(ListItemToCheckbox(new SelectListItem {
Text = optionLabel, Value = String.Empty, Selected = false
}, htmlAttributes, fullName));
halfLength = ((double)(length - 1.0)) / 2.0;
}
for (; index < halfLength; index++)
{
listItemBuilder.AppendLine(ListItemToCheckbox(selectListItems.ElementAt(index), htmlAttributes, fullName));
}
listItemBuilder.AppendLine("</div>");
listItemBuilder.AppendLine("<div class=\"col-md-6\">");
for (; index < length; index++)
{
listItemBuilder.AppendLine(ListItemToCheckbox(selectListItems.ElementAt(index), htmlAttributes, fullName));
}
listItemBuilder.AppendLine("</div>");
listItemBuilder.AppendLine("</div>");
return(listItemBuilder);
}
return(BuildItems(optionLabel, selectList, htmlAttributes, fullName));
}
public static MvcHtmlString CheckboxListInternal(this HtmlHelper htmlHelper, ModelMetadata metadata,
string optionLabel, string name, IEnumerable <SelectListItem> selectList, IDictionary <string, object> htmlAttributes, ColNumber cols)
{
var fullName = htmlHelper.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(name);
if (String.IsNullOrEmpty(fullName))
{
throw new ArgumentNullException("name", "Value cannot be null or empty.");
}
var defaultValue = GetModelStateValue(htmlHelper, 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 == null && !String.IsNullOrEmpty(name))
{
defaultValue = htmlHelper.ViewData.Eval(name);
}
if (defaultValue != null)
{
selectList = GetSelectListWithDefaultValue(selectList, defaultValue);
}
// Convert each ListItem to an <option> tag and wrap them with <optgroup> if requested.
var listItemBuilder = BuildItems(optionLabel, selectList, htmlAttributes, fullName, cols);
var tagBuilder = new TagBuilder("div")
{
InnerHtml = listItemBuilder.ToString()
};
tagBuilder.GenerateId(fullName);
// If there are any errors for a named field, we add the css attribute.
ModelState modelState;
if (htmlHelper.ViewData.ModelState.TryGetValue(fullName, out modelState))
{
if (modelState.Errors.Count > 0)
{
tagBuilder.AddCssClass(HtmlHelper.ValidationInputCssClassName);
}
}
tagBuilder.MergeAttributes(htmlHelper.GetUnobtrusiveValidationAttributes(name, metadata));
return(MvcHtmlString.Create(tagBuilder.ToString(TagRenderMode.Normal)));
}
private static MvcHtmlString CheckBoxListHelper(HtmlHelper htmlHelper, ModelMetadata metadata, string expression, IEnumerable <SelectListItem> selectList, string optionLabel, IDictionary <string, object> htmlAttributes, ColNumber cols)
{
return(CheckboxListInternal(htmlHelper, metadata, optionLabel, expression, selectList, htmlAttributes, cols));
}
public static MvcHtmlString CheckBoxListFor <TModel, TProperty>(this HtmlHelper <TModel> htmlHelper, Expression <Func <TModel, TProperty> > expression, IEnumerable <SelectListItem> selectList, string optionLabel, IDictionary <string, object> htmlAttributes, ColNumber cols)
{
if (expression == null)
{
throw new ArgumentNullException("expression");
}
var metadata = ModelMetadata.FromLambdaExpression(expression, htmlHelper.ViewData);
return(CheckBoxListHelper(htmlHelper, metadata, ExpressionHelper.GetExpressionText(expression), selectList, optionLabel, htmlAttributes, cols));
}
