在ASP.NET MVC Futures中有一个Html.RadioButtonList
扩展方法。有没有人找到强类型版本RadioButtonListFor<T>
的代码?在视图中,它看起来像这样:
<%= Html.RadioButtonListFor(model=>model.Item,Model.ItemList) %>
发布于 2010-04-07 12:28:55
下面是aspx页面中的用法
<%= Html.RadioButtonListFor(m => m.GenderRadioButtonList)%>
这是视图模型
public class HomePageViewModel
{
public enum GenderType
{
Male,
Female
}
public RadioButtonListViewModel<GenderType> GenderRadioButtonList { get; set; }
public HomePageViewModel()
{
GenderRadioButtonList = new RadioButtonListViewModel<GenderType>
{
Id = "Gender",
SelectedValue = GenderType.Male,
ListItems = new List<RadioButtonListItem<GenderType>>
{
new RadioButtonListItem<GenderType>{Text = "Male", Value = GenderType.Male},
new RadioButtonListItem<GenderType>{Text = "Female", Value = GenderType.Female}
}
};
}
}
下面是用于单选按钮列表的视图模型
public class RadioButtonListViewModel<T>
{
public string Id { get; set; }
private T selectedValue;
public T SelectedValue
{
get { return selectedValue; }
set
{
selectedValue = value;
UpdatedSelectedItems();
}
}
private void UpdatedSelectedItems()
{
if (ListItems == null)
return;
ListItems.ForEach(li => li.Selected = Equals(li.Value, SelectedValue));
}
private List<RadioButtonListItem<T>> listItems;
public List<RadioButtonListItem<T>> ListItems
{
get { return listItems; }
set
{
listItems = value;
UpdatedSelectedItems();
}
}
}
public class RadioButtonListItem<T>
{
public bool Selected { get; set; }
public string Text { get; set; }
public T Value { get; set; }
public override string ToString()
{
return Value.ToString();
}
}
下面是RadioButtonListFor的扩展方法
public static class HtmlHelperExtensions
{
public static string RadioButtonListFor<TModel, TRadioButtonListValue>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, RadioButtonListViewModel<TRadioButtonListValue>>> expression) where TModel : class
{
return htmlHelper.RadioButtonListFor(expression, null);
}
public static string RadioButtonListFor<TModel, TRadioButtonListValue>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, RadioButtonListViewModel<TRadioButtonListValue>>> expression, object htmlAttributes) where TModel : class
{
return htmlHelper.RadioButtonListFor(expression, new RouteValueDictionary(htmlAttributes));
}
public static string RadioButtonListFor<TModel, TRadioButtonListValue>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, RadioButtonListViewModel<TRadioButtonListValue>>> expression, IDictionary<string, object> htmlAttributes) where TModel : class
{
var inputName = GetInputName(expression);
RadioButtonListViewModel<TRadioButtonListValue> radioButtonList = GetValue(htmlHelper, expression);
if (radioButtonList == null)
return String.Empty;
if (radioButtonList.ListItems == null)
return String.Empty;
var divTag = new TagBuilder("div");
divTag.MergeAttribute("id", inputName);
divTag.MergeAttribute("class", "radio");
foreach (var item in radioButtonList.ListItems)
{
var radioButtonTag = RadioButton(htmlHelper, inputName, new SelectListItem{Text=item.Text, Selected = item.Selected, Value = item.Value.ToString()}, htmlAttributes);
divTag.InnerHtml += radioButtonTag;
}
return divTag + htmlHelper.ValidationMessage(inputName, "*");
}
public static string GetInputName<TModel, TProperty>(Expression<Func<TModel, TProperty>> expression)
{
if (expression.Body.NodeType == ExpressionType.Call)
{
var methodCallExpression = (MethodCallExpression)expression.Body;
string name = GetInputName(methodCallExpression);
return name.Substring(expression.Parameters[0].Name.Length + 1);
}
return expression.Body.ToString().Substring(expression.Parameters[0].Name.Length + 1);
}
private static string GetInputName(MethodCallExpression expression)
{
// p => p.Foo.Bar().Baz.ToString() => p.Foo OR throw...
var methodCallExpression = expression.Object as MethodCallExpression;
if (methodCallExpression != null)
{
return GetInputName(methodCallExpression);
}
return expression.Object.ToString();
}
public static string RadioButton(this HtmlHelper htmlHelper, string name, SelectListItem listItem,
IDictionary<string, object> htmlAttributes)
{
var inputIdSb = new StringBuilder();
inputIdSb.Append(name)
.Append("_")
.Append(listItem.Value);
var sb = new StringBuilder();
var builder = new TagBuilder("input");
if (listItem.Selected) builder.MergeAttribute("checked", "checked");
builder.MergeAttribute("type", "radio");
builder.MergeAttribute("value", listItem.Value);
builder.MergeAttribute("id", inputIdSb.ToString());
builder.MergeAttribute("name", name + ".SelectedValue");
builder.MergeAttributes(htmlAttributes);
sb.Append(builder.ToString(TagRenderMode.SelfClosing));
sb.Append(RadioButtonLabel(inputIdSb.ToString(), listItem.Text, htmlAttributes));
sb.Append("<br>");
return sb.ToString();
}
public static string RadioButtonLabel(string inputId, string displayText,
IDictionary<string, object> htmlAttributes)
{
var labelBuilder = new TagBuilder("label");
labelBuilder.MergeAttribute("for", inputId);
labelBuilder.MergeAttributes(htmlAttributes);
labelBuilder.InnerHtml = displayText;
return labelBuilder.ToString(TagRenderMode.Normal);
}
public static TProperty GetValue<TModel, TProperty>(HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression) where TModel : class
{
TModel model = htmlHelper.ViewData.Model;
if (model == null)
{
return default(TProperty);
}
Func<TModel, TProperty> func = expression.Compile();
return func(model);
}
}
发布于 2012-08-20 15:42:06
基于Jon post,使用HTMLAttributtes将单选按钮列表生成为ul,这是一个小小的改进
public static MvcHtmlString RadioButtonListFor<TModel, TProperty>(
this HtmlHelper<TModel> htmlHelper,
Expression<Func<TModel, TProperty>> expression,
IEnumerable<SelectListItem> listOfValues,
IDictionary<string, object> radioHtmlAttributes = null,
string ulClass = null)
{
ModelMetadata metaData = ModelMetadata.FromLambdaExpression(expression, htmlHelper.ViewData);
if (radioHtmlAttributes == null)
radioHtmlAttributes = new RouteValueDictionary();
TagBuilder ulTag = new TagBuilder("ul");
if (!String.IsNullOrEmpty(ulClass))
ulTag.MergeAttribute("class", ulClass);
if (listOfValues != null)
{
// Create a radio button for each item in the list
foreach (SelectListItem item in listOfValues)
{
// Generate an id to be given to the radio button field
var id = string.Format("{0}_{1}", metaData.PropertyName, item.Value);
if (!radioHtmlAttributes.ContainsKey("id"))
radioHtmlAttributes.Add("id", id);
else
radioHtmlAttributes["id"] = id;
// Create and populate a radio button using the existing html helpers
var label = htmlHelper.Label(id, HttpUtility.HtmlEncode(item.Text));
var radio = htmlHelper.RadioButtonFor(expression, item.Value, radioHtmlAttributes).ToHtmlString();
// Create the html string that will be returned to the client
// e.g. <input data-val="true" data-val-required="You must select an option" id="TestRadio_1" name="TestRadio" type="radio" value="1" /><label for="TestRadio_1">Line1</label>
ulTag.InnerHtml += string.Format("<li>{0}{1}</li>", radio, label);
}
}
return MvcHtmlString.Create(ulTag.ToString(TagRenderMode.Normal));
}
public static MvcHtmlString RadioButtonListFor<TModel, TProperty>(
this HtmlHelper<TModel> htmlHelper,
Expression<Func<TModel, TProperty>> expression,
IEnumerable<SelectListItem> listOfValues,
object radioHtmlAttributes = null,
string ulClass = null)
{
return RadioButtonListFor<TModel, TProperty>(htmlHelper, expression, listOfValues, new RouteValueDictionary(radioHtmlAttributes), ulClass);
}
发布于 2010-03-25 15:20:34
我在MVC1.0中实现了类似的东西。看看这对你是否有帮助:
public static string RadioButtonList2(this HtmlHelper _helper, string _name, IEnumerable<SelectListItem> _items, string _selectedValue, string _seperator)
{
return RadioButtonList2(_helper, _name, _items, _selectedValue, _seperator, null);
}
public static string RadioButtonList2(this HtmlHelper _helper, string _name, IEnumerable<SelectListItem> _items, string _selectedValue, string _seperator, IDictionary<string, object> _htmlAttributes)
{
StringBuilder _outputScript = new StringBuilder();
foreach (var item in _items)
{
var optionField = new TagBuilder("input");
optionField.MergeAttribute("name", _name);
optionField.MergeAttribute("id", _name);
optionField.MergeAttribute("class", _name);
optionField.MergeAttribute("value", item.Value);
optionField.MergeAttribute("type", "radio");
// Check to see if it's checked
if (item.Value == _selectedValue)
optionField.MergeAttribute("checked", "checked");
if (_htmlAttributes != null)
optionField.MergeAttributes(_htmlAttributes);
_outputScript.Append(optionField.ToString(TagRenderMode.SelfClosing));
_outputScript.Append("<label style=\"display:inline;\">");
_outputScript.Append(item.Text);
_outputScript.Append("</label>" + _seperator);
}
return _outputScript.ToString();
}
在控制器中,可以按如下方式返回结果:
ViewData["GenderList"] = new SelectList(new[] { new { Value = "M", Text = "Male" }, new { Value = "F", Text = "Female" }, new { Value = "A", Text = "All" } }, "Value", "Text");
或
ViewData["GenderList"] = new SelectList(_resultFromSomeLinqQuery, "GenderID", "GenderName");
并在视图中使用它,如下所示:
<%= Html.RadioButtonList2("Sex", ViewData["GenderList"] as SelectList, ViewData["SelectedSex"].ToString(), " ")%>
您还可以将
替换为<BR />
,以便在单独的行中显示它们。
希望这能有所帮助。
关于Naweed naweed@xgeno.com
https://stackoverflow.com/questions/2512809
复制相似问题