支持在DropDownList中.NET MVC OPTGROUP？ [英] Support for optgroup in dropdownlist .NET MVC?

问题描述

从这个问题<持续上href=\"http://stackoverflow.com/questions/323063/whats-the-best-way-to-set-a-dropdown-to-selected-in-asp-net-mvc-markup\">programmatically创建一个下拉列表我想我的名单有几个 OPTGROUP 列出了。这是目前可能？

我知道我需要一个选择列表传递给DROPDOWNLIST但不知道怎么的文字，数值，OPTGROUP添加到选择列表。

我想最终的结果产生：

 ＆LT;期权价值=＆gt;请选择＆LT; /选项＆GT;
  ＆LT; OPTGROUP标签=选项A＆GT;
    ＆LT;期权价值=1＆GT; 1 LT; /选项＆GT;
    ＆LT;期权价值=2＆GT; 2'; /选项＆GT;
    ＆LT;期权价值=3＆GT;第3版; /选项＆GT;
    ＆LT;期权价值=4＆GT; 4℃; /选项＆GT;
  ＆LT; / OPTGROUP＆GT;
  ＆LT; OPTGROUP标签=选项B＆GT;
    ＆LT;期权价值=一个＆gt;将＆LT; /选项＆GT;
    ＆LT;期权价值=B＆GT; B＆LT; /选项＆GT;
    ＆LT;期权价值=C＆GT; C＆LT; /选项＆GT;
  ＆LT; / OPTGROUP＆GT;
＆LT; /选项＆GT;
 

解决方案

看通过 WWW的code，codeplex.com / ASPNET ，它不会出现，无论是选择列表的，也不是DropDownList的扩展方法支持在选择使用OPTGROUP的。看起来你需要编写自己的扩展方法，延长SelectListItem包含分组或生成选择在手动标记

Continuing on from this question programmatically creating a drop down list I would like my list to have several optgroup lists too. Is this currently possible?

I know I need to pass a selectList to a dropDownList but do not know how to add text, value, optgroup to the selectList.

I want the end result to produce:

<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>

解决方案

Looking through the code on www.codeplex.com/aspnet, it doesn't appear that neither the SelectList nor the DropDownList extension method supports the use of OptGroup in a select. Looks like you'll need to write your own extension method and extend SelectListItem to contain the grouping or generate the select manually in markup.

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