ドロップダウンリスト.NET MVCでのoptgroupのサポート？
この質問から続ける プログラムでドロップダウンリストを作成する 私のリストにもいくつかのoptgroupリストが必要です。これは現在可能ですか？
SelectListをdropDownListに渡す必要があることは知っていますが、selectListにテキスト、値、optgroupを追加する方法はわかりません。
最終結果を生成したい：
<option value="">Please select</option>
<optgroup label="Option A">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
</optgroup>
<optgroup label="Option B">
<option value="a">A</option>
<option value="b">B</option>
<option value="c">C</option>
</optgroup>
</option>
www.codeplex.com/aspnet のコードを見ると、SelectListおよびDropDownList拡張メソッドのいずれもselectでのOptGroupの使用をサポートしていないようです。独自の拡張メソッドを記述し、SelectListItemを拡張してグループ化を含めるか、マークアップで手動で選択を生成する必要があるようです。
私の拡張機能はもう少し複雑ですが、元のDropDownListが持っているようにすべてのオーバーロードがあります。
実際に、グループでDropDownListを生成し、 jDoubleSelect を使用して2つの結合された選択に変換できるように特別に作成しました。
using System;using System.Collections;using System.Collections.Generic;using System.Globalization; using System.Linq;using System.Linq.Expressions;using System.Text; using System.Web;using System.Web.Mvc;using System.Web.Routing;
public class GroupedSelectListItem : SelectListItem
{
public string GroupKey { get; set; }
public string GroupName { get; set; }
}
public static class HtmlHelpers
{
public static MvcHtmlString DropDownGroupList(this HtmlHelper htmlHelper, string name)
{
return DropDownListHelper(htmlHelper, name, null, null, null);
}
public static MvcHtmlString DropDownGroupList(this HtmlHelper htmlHelper, string name, IEnumerable<GroupedSelectListItem> selectList)
{
return DropDownListHelper(htmlHelper, name, selectList, null, null);
}
public static MvcHtmlString DropDownGroupList(this HtmlHelper htmlHelper, string name, string optionLabel)
{
return DropDownListHelper(htmlHelper, name, null, optionLabel, null);
}
public static MvcHtmlString DropDownGroupList(this HtmlHelper htmlHelper, string name, IEnumerable<GroupedSelectListItem> selectList, IDictionary<string, object> htmlAttributes)
{
return DropDownListHelper(htmlHelper, name, selectList, null, htmlAttributes);
}
public static MvcHtmlString DropDownGroupList(this HtmlHelper htmlHelper, string name, IEnumerable<GroupedSelectListItem> selectList, object htmlAttributes)
{
return DropDownListHelper(htmlHelper, name, selectList, null, HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes));
}
public static MvcHtmlString DropDownGroupList(this HtmlHelper htmlHelper, string name, IEnumerable<GroupedSelectListItem> selectList, string optionLabel)
{
return DropDownListHelper(htmlHelper, name, selectList, optionLabel, null);
}
public static MvcHtmlString DropDownGroupList(this HtmlHelper htmlHelper, string name, IEnumerable<GroupedSelectListItem> selectList, string optionLabel, IDictionary<string, object> htmlAttributes)
{
return DropDownListHelper(htmlHelper, name, selectList, optionLabel, htmlAttributes);
}
public static MvcHtmlString DropDownGroupList(this HtmlHelper htmlHelper, string name, IEnumerable<GroupedSelectListItem> selectList, string optionLabel, object htmlAttributes)
{
return DropDownListHelper(htmlHelper, name, selectList, optionLabel, HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes));
}
public static MvcHtmlString DropDownGroupListFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression, IEnumerable<GroupedSelectListItem> selectList)
{
return DropDownGroupListFor(htmlHelper, expression, selectList, null /* optionLabel */, null /* htmlAttributes */);
}
public static MvcHtmlString DropDownGroupListFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression, IEnumerable<GroupedSelectListItem> selectList, object htmlAttributes)
{
return DropDownGroupListFor(htmlHelper, expression, selectList, null /* optionLabel */, HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes));
}
public static MvcHtmlString DropDownGroupListFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression, IEnumerable<GroupedSelectListItem> selectList, IDictionary<string, object> htmlAttributes)
{
return DropDownGroupListFor(htmlHelper, expression, selectList, null /* optionLabel */, htmlAttributes);
}
public static MvcHtmlString DropDownGroupListFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression, IEnumerable<GroupedSelectListItem> selectList, string optionLabel)
{
return DropDownGroupListFor(htmlHelper, expression, selectList, optionLabel, null /* htmlAttributes */);
}
public static MvcHtmlString DropDownGroupListFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression, IEnumerable<GroupedSelectListItem> selectList, string optionLabel, object htmlAttributes)
{
return DropDownGroupListFor(htmlHelper, expression, selectList, optionLabel, HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes));
}
public static MvcHtmlString DropDownGroupListFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression, IEnumerable<GroupedSelectListItem> selectList, string optionLabel, IDictionary<string, object> htmlAttributes)
{
if (expression == null)
{
throw new ArgumentNullException("expression");
}
return DropDownListHelper(htmlHelper, ExpressionHelper.GetExpressionText(expression), selectList, optionLabel, htmlAttributes);
}
private static MvcHtmlString DropDownListHelper(HtmlHelper htmlHelper, string expression, IEnumerable<GroupedSelectListItem> selectList, string optionLabel, IDictionary<string, object> htmlAttributes)
{
return SelectInternal(htmlHelper, optionLabel, expression, selectList, false /* allowMultiple */, htmlAttributes);
}
// Helper methods
private static IEnumerable<GroupedSelectListItem> GetSelectData(this HtmlHelper htmlHelper, string name)
{
object o = null;
if (htmlHelper.ViewData != null)
{
o = htmlHelper.ViewData.Eval(name);
}
if (o == null)
{
throw new InvalidOperationException(
String.Format(
CultureInfo.CurrentCulture,
"Missing Select Data"));
}
var selectList = o as IEnumerable<GroupedSelectListItem>;
if (selectList == null)
{
throw new InvalidOperationException(
String.Format(
CultureInfo.CurrentCulture,
"Wrong Select DataType"));
}
return selectList;
}
internal static string ListItemToOption(GroupedSelectListItem item)
{
var builder = new TagBuilder("option")
{
InnerHtml = HttpUtility.HtmlEncode(item.Text)
};
if (item.Value != null)
{
builder.Attributes["value"] = item.Value;
}
if (item.Selected)
{
builder.Attributes["selected"] = "selected";
}
return builder.ToString(TagRenderMode.Normal);
}
private static MvcHtmlString SelectInternal(this HtmlHelper htmlHelper, string optionLabel, string name, IEnumerable<GroupedSelectListItem> selectList, bool allowMultiple, IDictionary<string, object> htmlAttributes)
{
name = htmlHelper.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(name);
if (String.IsNullOrEmpty(name))
{
throw new ArgumentException("Null Or Empty", "name");
}
bool usedViewData = false;
// If we got a null selectList, try to use ViewData to get the list of items.
if (selectList == null)
{
selectList = htmlHelper.GetSelectData(name);
usedViewData = true;
}
object defaultValue = (allowMultiple) ? htmlHelper.GetModelStateValue(name, typeof(string[])) : htmlHelper.GetModelStateValue(name, 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 (!usedViewData)
{
if (defaultValue == null)
{
defaultValue = htmlHelper.ViewData.Eval(name);
}
}
if (defaultValue != null)
{
var defaultValues = (allowMultiple) ? defaultValue as IEnumerable : new[] { defaultValue };
var values = from object value in defaultValues select Convert.ToString(value, CultureInfo.CurrentCulture);
var selectedValues = new HashSet<string>(values, StringComparer.OrdinalIgnoreCase);
var newSelectList = new List<GroupedSelectListItem>();
foreach (var item in selectList)
{
item.Selected = (item.Value != null) ? selectedValues.Contains(item.Value) : selectedValues.Contains(item.Text);
newSelectList.Add(item);
}
selectList = newSelectList;
}
// Convert each ListItem to an <option> tag
var listItemBuilder = new StringBuilder();
// Make optionLabel the first item that gets rendered.
if (optionLabel != null)
{
listItemBuilder.AppendLine(ListItemToOption(new GroupedSelectListItem { Text = optionLabel, Value = String.Empty, Selected = false }));
}
foreach (var group in selectList.GroupBy(i => i.GroupKey))
{
string groupName = selectList.Where(i => i.GroupKey == group.Key).Select(it => it.GroupName).FirstOrDefault();
listItemBuilder.AppendLine(string.Format("<optgroup label=\"{0}\" value=\"{1}\">", groupName, group.Key));
foreach (GroupedSelectListItem item in group)
{
listItemBuilder.AppendLine(ListItemToOption(item));
}
listItemBuilder.AppendLine("</optgroup>");
}
var tagBuilder = new TagBuilder("select")
{
InnerHtml = listItemBuilder.ToString()
};
tagBuilder.MergeAttributes(htmlAttributes);
tagBuilder.MergeAttribute("name", name, true /* replaceExisting */);
tagBuilder.GenerateId(name);
if (allowMultiple)
{
tagBuilder.MergeAttribute("multiple", "multiple");
}
// If there are any errors for a named field, we add the css attribute.
ModelState modelState;
if (htmlHelper.ViewData.ModelState.TryGetValue(name, out modelState))
{
if (modelState.Errors.Count > 0)
{
tagBuilder.AddCssClass(HtmlHelper.ValidationInputCssClassName);
}
}
return MvcHtmlString.Create(tagBuilder.ToString());
}
internal static object GetModelStateValue(this HtmlHelper helper, string key, Type destinationType)
{
ModelState modelState;
if (helper.ViewData.ModelState.TryGetValue(key, out modelState))
{
if (modelState.Value != null)
{
return modelState.Value.ConvertTo(destinationType, null /* culture */);
}
}
return null;
}
}
これは、バージョン5.2でASP.Net MVCに追加され、現在は組み込まれています。
SelectListItemのGroupプロパティ を使用すると、各アイテムのグループを指定できます。
新しい SelectListコンストラクター では、指定されたアイテムのリストにグループタイトルを含むフィールドの名前を指定することもできます。
HtmlHelper DropDownListおよびDropDownListForメソッドは、アイテムのリストに含まれるグループに基づいてoptgroup要素を生成するようになりました。
簡単！
これを行うための拡張機能を作成するだけです。
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web.Routing;
namespace System.Web.Mvc.Html
{
public static class GroupDropListExtensions
{
public static string GroupDropList(this HtmlHelper helper, string name, IEnumerable<GroupDropListItem> data, string SelectedValue, object htmlAttributes)
{
if (data == null && helper.ViewData != null)
data = helper.ViewData.Eval(name) as IEnumerable<GroupDropListItem>;
if (data == null) return string.Empty;
var select = new TagBuilder("select");
if (htmlAttributes != null)
select.MergeAttributes(new RouteValueDictionary(htmlAttributes));
select.GenerateId(name);
var optgroupHtml = new StringBuilder();
var groups = data.ToList();
foreach (var group in data)
{
var groupTag = new TagBuilder("optgroup");
groupTag.Attributes.Add("label", helper.Encode( group.Name));
var optHtml = new StringBuilder();
foreach (var item in group.Items)
{
var option = new TagBuilder("option");
option.Attributes.Add("value", helper.Encode(item.Value));
if (SelectedValue != null && item.Value == SelectedValue)
option.Attributes.Add("selected", "selected");
option.InnerHtml = helper.Encode(item.Text);
optHtml.AppendLine(option.ToString(TagRenderMode.Normal));
}
groupTag.InnerHtml = optHtml.ToString();
optgroupHtml.AppendLine(groupTag.ToString(TagRenderMode.Normal));
}
select.InnerHtml = optgroupHtml.ToString();
return select.ToString(TagRenderMode.Normal);
}
}
public class GroupDropListItem
{
public string Name { get; set; }
public List<OptionItem> Items { get; set; }
}
public class OptionItem
{
public string Text { get; set; }
public string Value { get; set; }
}
}
Serge Zabの答えはまさに私が探していたものでした。ダイダイハードVB=プログラマー私はこれに移植しましたVBモジュール：
'based on Serge Zab's answer on http://stackoverflow.com/questions/607188/support-for-optgroup-in-dropdownlist-net-mvc
Imports System.Collections
Imports System.Collections.Generic
Imports System.Globalization
Imports System.Linq
Imports System.Linq.Expressions
Imports System.Text
Imports System.Web
Imports System.Web.Mvc
Imports System.Web.Routing
Public Class GroupedSelectListItem
Inherits SelectListItem
Public Property GroupKey() As String
Get
Return m_GroupKey
End Get
Set(value As String)
m_GroupKey = Value
End Set
End Property
Private m_GroupKey As String
Public Property GroupName() As String
Get
Return m_GroupName
End Get
Set(value As String)
m_GroupName = Value
End Set
End Property
Private m_GroupName As String
End Class
Public Module HtmlHelpers
<System.Runtime.CompilerServices.Extension> _
Public Function DropDownGroupList(htmlHelper As HtmlHelper, name As String) As MvcHtmlString
Return DropDownListHelper(htmlHelper, name, Nothing, Nothing, Nothing)
End Function
<System.Runtime.CompilerServices.Extension> _
Public Function DropDownGroupList(htmlHelper As HtmlHelper, name As String, selectList As IEnumerable(Of GroupedSelectListItem)) As MvcHtmlString
Return DropDownListHelper(htmlHelper, name, selectList, Nothing, Nothing)
End Function
<System.Runtime.CompilerServices.Extension> _
Public Function DropDownGroupList(htmlHelper As HtmlHelper, name As String, optionLabel As String) As MvcHtmlString
Return DropDownListHelper(htmlHelper, name, Nothing, optionLabel, Nothing)
End Function
<System.Runtime.CompilerServices.Extension> _
Public Function DropDownGroupList(htmlHelper As HtmlHelper, name As String, selectList As IEnumerable(Of GroupedSelectListItem), htmlAttributes As IDictionary(Of String, Object)) As MvcHtmlString
Return DropDownListHelper(htmlHelper, name, selectList, Nothing, htmlAttributes)
End Function
<System.Runtime.CompilerServices.Extension> _
Public Function DropDownGroupList(htmlHelper As HtmlHelper, name As String, selectList As IEnumerable(Of GroupedSelectListItem), htmlAttributes As Object) As MvcHtmlString
Return DropDownListHelper(htmlHelper, name, selectList, Nothing, New RouteValueDictionary(htmlAttributes))
End Function
<System.Runtime.CompilerServices.Extension> _
Public Function DropDownGroupList(htmlHelper As HtmlHelper, name As String, selectList As IEnumerable(Of GroupedSelectListItem), optionLabel As String) As MvcHtmlString
Return DropDownListHelper(htmlHelper, name, selectList, optionLabel, Nothing)
End Function
<System.Runtime.CompilerServices.Extension> _
Public Function DropDownGroupList(htmlHelper As HtmlHelper, name As String, selectList As IEnumerable(Of GroupedSelectListItem), optionLabel As String, htmlAttributes As IDictionary(Of String, Object)) As MvcHtmlString
Return DropDownListHelper(htmlHelper, name, selectList, optionLabel, htmlAttributes)
End Function
<System.Runtime.CompilerServices.Extension> _
Public Function DropDownGroupList(htmlHelper As HtmlHelper, name As String, selectList As IEnumerable(Of GroupedSelectListItem), optionLabel As String, htmlAttributes As Object) As MvcHtmlString
Return DropDownListHelper(htmlHelper, name, selectList, optionLabel, New RouteValueDictionary(htmlAttributes))
End Function
<System.Runtime.CompilerServices.Extension> _
Public Function DropDownGroupListFor(Of TModel, TProperty)(htmlHelper As HtmlHelper(Of TModel), expression As Expression(Of Func(Of TModel, TProperty)), selectList As IEnumerable(Of GroupedSelectListItem)) As MvcHtmlString
' optionLabel
' htmlAttributes
Return DropDownGroupListFor(htmlHelper, expression, selectList, Nothing, Nothing)
End Function
<System.Runtime.CompilerServices.Extension> _
Public Function DropDownGroupListFor(Of TModel, TProperty)(htmlHelper As HtmlHelper(Of TModel), expression As Expression(Of Func(Of TModel, TProperty)), selectList As IEnumerable(Of GroupedSelectListItem), htmlAttributes As Object) As MvcHtmlString
' optionLabel
Return DropDownGroupListFor(htmlHelper, expression, selectList, Nothing, New RouteValueDictionary(htmlAttributes))
End Function
<System.Runtime.CompilerServices.Extension> _
Public Function DropDownGroupListFor(Of TModel, TProperty)(htmlHelper As HtmlHelper(Of TModel), expression As Expression(Of Func(Of TModel, TProperty)), selectList As IEnumerable(Of GroupedSelectListItem), htmlAttributes As IDictionary(Of String, Object)) As MvcHtmlString
' optionLabel
Return DropDownGroupListFor(htmlHelper, expression, selectList, Nothing, htmlAttributes)
End Function
<System.Runtime.CompilerServices.Extension> _
Public Function DropDownGroupListFor(Of TModel, TProperty)(htmlHelper As HtmlHelper(Of TModel), expression As Expression(Of Func(Of TModel, TProperty)), selectList As IEnumerable(Of GroupedSelectListItem), optionLabel As String) As MvcHtmlString
' htmlAttributes
Return DropDownGroupListFor(htmlHelper, expression, selectList, optionLabel, Nothing)
End Function
<System.Runtime.CompilerServices.Extension> _
Public Function DropDownGroupListFor(Of TModel, TProperty)(htmlHelper As HtmlHelper(Of TModel), expression As Expression(Of Func(Of TModel, TProperty)), selectList As IEnumerable(Of GroupedSelectListItem), optionLabel As String, htmlAttributes As Object) As MvcHtmlString
Return DropDownGroupListFor(htmlHelper, expression, selectList, optionLabel, New RouteValueDictionary(htmlAttributes))
End Function
<System.Runtime.CompilerServices.Extension> _
Public Function DropDownGroupListFor(Of TModel, TProperty)(htmlHelper As HtmlHelper(Of TModel), expression As Expression(Of Func(Of TModel, TProperty)), selectList As IEnumerable(Of GroupedSelectListItem), optionLabel As String, htmlAttributes As IDictionary(Of String, Object)) As MvcHtmlString
If expression Is Nothing Then
Throw New ArgumentNullException("expression")
End If
Return DropDownListHelper(htmlHelper, ExpressionHelper.GetExpressionText(expression), selectList, optionLabel, htmlAttributes)
End Function
Private Function DropDownListHelper(htmlHelper As HtmlHelper, expression As String, selectList As IEnumerable(Of GroupedSelectListItem), optionLabel As String, htmlAttributes As IDictionary(Of String, Object)) As MvcHtmlString
' allowMultiple
Return SelectInternal(htmlHelper, optionLabel, expression, selectList, False, htmlAttributes)
End Function
' Helper methods
<System.Runtime.CompilerServices.Extension> _
Private Function GetSelectData(htmlHelper As HtmlHelper, name As String) As IEnumerable(Of GroupedSelectListItem)
Dim o As Object = Nothing
If htmlHelper.ViewData IsNot Nothing Then
o = htmlHelper.ViewData.Eval(name)
End If
If o Is Nothing Then
Throw New InvalidOperationException([String].Format(CultureInfo.CurrentCulture, "Missing Select Data", name, "IEnumerable<GroupedSelectListItem>"))
End If
Dim selectList As IEnumerable(Of GroupedSelectListItem) = TryCast(o, IEnumerable(Of GroupedSelectListItem))
If selectList Is Nothing Then
Throw New InvalidOperationException([String].Format(CultureInfo.CurrentCulture, "Wrong Select DataType", name, o.[GetType]().FullName, "IEnumerable<GroupedSelectListItem>"))
End If
Return selectList
End Function
Friend Function ListItemToOption(item As GroupedSelectListItem) As String
Dim builder As New TagBuilder("option") With { _
.InnerHtml = HttpUtility.HtmlEncode(item.Text) _
}
If item.Value IsNot Nothing Then
builder.Attributes("value") = item.Value
End If
If item.Selected Then
builder.Attributes("selected") = "selected"
End If
Return builder.ToString(TagRenderMode.Normal)
End Function
<System.Runtime.CompilerServices.Extension> _
Private Function SelectInternal(htmlHelper__1 As HtmlHelper, optionLabel As String, name As String, selectList As IEnumerable(Of GroupedSelectListItem), allowMultiple As Boolean, htmlAttributes As IDictionary(Of String, Object)) As MvcHtmlString
name = htmlHelper__1.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(name)
If [String].IsNullOrEmpty(name) Then
Throw New ArgumentException("Null Or Empty", "name")
End If
Dim usedViewData As Boolean = False
' If we got a null selectList, try to use ViewData to get the list of items.
If selectList Is Nothing Then
selectList = htmlHelper__1.GetSelectData(name)
usedViewData = True
End If
Dim defaultValue As Object = If((allowMultiple), htmlHelper__1.GetModelStateValue(name, GetType(String())), htmlHelper__1.GetModelStateValue(name, GetType(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 Not usedViewData Then
If defaultValue Is Nothing Then
defaultValue = htmlHelper__1.ViewData.Eval(name)
End If
End If
If defaultValue IsNot Nothing Then
Dim defaultValues As IEnumerable = If((allowMultiple), TryCast(defaultValue, IEnumerable), New String() {defaultValue})
Dim values As IEnumerable(Of String) = From value In defaultValues Select (Convert.ToString(value, CultureInfo.CurrentCulture))
Dim selectedValues As New HashSet(Of String)(values, StringComparer.OrdinalIgnoreCase)
Dim newSelectList As New List(Of GroupedSelectListItem)()
For Each item As GroupedSelectListItem In selectList
item.Selected = If((item.Value IsNot Nothing), selectedValues.Contains(item.Value), selectedValues.Contains(item.Text))
newSelectList.Add(item)
Next
selectList = newSelectList
End If
' Convert each ListItem to an <option> tag
Dim listItemBuilder As New StringBuilder()
' Make optionLabel the first item that gets rendered.
If optionLabel IsNot Nothing Then
listItemBuilder.AppendLine(ListItemToOption(New GroupedSelectListItem() With { _
.Text = optionLabel, _
.Value = [String].Empty, _
.Selected = False _
}))
End If
For Each group As Object In selectList.GroupBy(Function(i) i.GroupKey)
Dim groupName As String = selectList.Where(Function(i) i.GroupKey = group.Key).[Select](Function(it) it.GroupName).FirstOrDefault()
listItemBuilder.AppendLine(String.Format("<optgroup label=""{0}"" value=""{1}"">", groupName, group.Key))
For Each item As GroupedSelectListItem In group
listItemBuilder.AppendLine(ListItemToOption(item))
Next
listItemBuilder.AppendLine("</optgroup>")
Next
Dim tagBuilder As New TagBuilder("select") With { _
.InnerHtml = listItemBuilder.ToString() _
}
TagBuilder.MergeAttributes(htmlAttributes)
' replaceExisting
TagBuilder.MergeAttribute("name", name, True)
TagBuilder.GenerateId(name)
If allowMultiple Then
TagBuilder.MergeAttribute("multiple", "multiple")
End If
' If there are any errors for a named field, we add the css attribute.
Dim modelState As ModelState = Nothing
If htmlHelper__1.ViewData.ModelState.TryGetValue(name, modelState) Then
If modelState.Errors.Count > 0 Then
TagBuilder.AddCssClass(HtmlHelper.ValidationInputCssClassName)
End If
End If
Return MvcHtmlString.Create(TagBuilder.ToString())
End Function
<System.Runtime.CompilerServices.Extension> _
Friend Function GetModelStateValue(helper As HtmlHelper, key As String, destinationType As Type) As Object
Dim modelState As ModelState = Nothing
If helper.ViewData.ModelState.TryGetValue(key, modelState) Then
If modelState.Value IsNot Nothing Then
' culture
Return modelState.Value.ConvertTo(destinationType, Nothing)
End If
End If
Return Nothing
End Function
End Module
私は@Serge Zabソリューションを試してみましたが、それはうまく機能しますが、目立たない検証でいくつかの問題を抱えていました。いくつかの検査の後、私は問題を見つけました。
TagBuilderを作成した直後にJquery検証を起動する場合、select要素からいくつかの必須属性が欠落しているようです
TagBuilder tagBuilder = new TagBuilder("select");
これらの属性を追加します
tagBuilder.MergeAttribute("data-val", "true",true);
tagBuilder.MergeAttribute("data-val-required", "your validation message", true)
そして控えめな検証が起動するはずです。
クライアント検証のデータ注釈がありませんか？
上記のChrno Loveの質問への回答で、Serge Zabのソリューションに追加-同じビューでドロップダウンのコレクションを使用する場合のMVC3クライアント側検証属性に対するMilimetricの修正：
public static MvcHtmlString DropDownGroupListFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper,
Expression<Func<TModel, TProperty>>
expression,
IEnumerable<GroupedSelectListItem>
selectList, string optionLabel,
IDictionary<string, object> htmlAttributes)
{
if (expression == null)
{
throw new ArgumentNullException("expression");
}
// fixing clientside validation attributes
// http://stackoverflow.com/questions/4799958/asp-net-mvc-3-unobtrusive-client-validation-does-not-work-with-drop-down-lists/8102022#8102022
var metadata = ModelMetadata.FromLambdaExpression(expression, htmlHelper.ViewData);
var mergedAttributes =
htmlHelper.GetUnobtrusiveValidationAttributes(ExpressionHelper.GetExpressionText(expression), metadata);
if (htmlAttributes != null)
{
foreach (PropertyDescriptor descriptor in TypeDescriptor.GetProperties(htmlAttributes))
{
object value = descriptor.GetValue(htmlAttributes);
mergedAttributes.Add(descriptor.Name, value);
}
}
//return DropDownListHelper(htmlHelper, ExpressionHelper.GetExpressionText(expression), selectList, optionLabel, htmlAttributes);
return DropDownListHelper(htmlHelper, ExpressionHelper.GetExpressionText(expression), selectList, optionLabel, mergedAttributes);
}
Optgroupで複数選択を処理するソリューションが必要で、Serge Zabソリューションを使用しました。コメントは2つだけです（コメントするには長すぎます）。
彼の主張にもかかわらず、彼のソリューションは、多くの場合モデルで使用されるMultiSelectListまたはSelectListをサポートしていないため、DropDownListForの既存のオーバーロードをすべてサポートしていません。しかし、これらを追加するのは難しくありません。
彼のソリューションは、モデルから選択された/選択されていないアイテムを初期化する複数選択のために私のために働いていませんでした：初期値は影響を受けませんでした。次のメソッドを変更しました。
private static MvcHtmlString DropDownListHelper（...）{return SelectInternal（htmlHelper、optionLabel、expression、selectList、false/* allowMultiple * /、htmlAttributes）; }
これに：
private static MvcHtmlString DropDownListHelper(HtmlHelper htmlHelper, string expression, IEnumerable<GroupedSelectListItem> selectList, string optionLabel, IDictionary<string, object> htmlAttributes)
{
bool allowMultiple = htmlAttributes.ContainsKey("multiple");
return SelectInternal(htmlHelper, optionLabel, expression, selectList, allowMultiple, htmlAttributes);
}
そして、期待どおりに機能しました。もちろん、複数の属性を定義する必要があります：@ Html.DropDownGroupListFor（m => m.Selected、Model.Values、new {multiple = "multiple"}）
答えてくれたセルジュに感謝します。
Sergeの拡張機能を使用して、同じフォームに複数の選択リストを作成する場合の注意点。グループを適用するために2番目の選択リストを取得するのに問題があり、生成されたhtmlを調べたところ、両方に同じIDが与えられていることがわかりました。これを修正するには、sergeの拡張機能のSelectInternal関数に移動して、次の2行をコメント化/削除します。
tagBuilder.MergeAttribute（ "name"、name、true/* replaceExisting * /）; tagBuilder.GenerateId（name）;
または、一意のIDをそれぞれに渡すことができます（ただし、DropDownGroupListForは 'string name'パラメーターを受け取らないため、これを行うオーバーロードを追加する必要があります）
Serge Zab answer では、_data_valuename_などのデータ属性は、正しい形式_data-valuename_で余白を付けません。
SelectInternalメソッドのコードtagBuilder.MergeAttributes(htmlAttributes);をこれに置き換えました
_foreach (var htmlAttribute in htmlAttributes)
{
tagBuilder.MergeAttribute(
htmlAttribute.Key.Replace('_', '-'),
(string)htmlAttribute.Value
);
}
_