在 ASP.NET MVC 中的 HTML.DropDownList Helper 方法中显示分层数据
我在数据库中有一个表，它本身有一个外键。在添加产品时，我希望用户能够从 DropDownList 中选择一个类别。现在，我可以显示如下结果 ::
- Electronics
- MP3 Players
但是，如果像这样显示那就更理想了，因为 MP3 Player 是一个孩子电子学：-
- 电子
- MP3 播放器
如何在 DropDownList 中实现此目的？ 我当前的检索和显示代码分别如下：-
public ActionResult Create()
{
ViewBag.ParentCategoryID = new SelectList(db.Categories, "CategoryID", "CategoryName");
return View();
}
CSHTML
<div class="editor-field">
@Html.DropDownList("ParentCategoryID", String.Empty)
@Html.ValidationMessageFor(model => model.ParentCategoryID)
</div>
I have a table in database that has a foreign key to itself. While adding product products I want the users to be able to select a category from DropDownList. Right now, I am able to show the result like following ::
- Electronics
- MP3 Players
But, it would be ideal if they are shown like this, since MP3 Player is a child of Electronics :-
- Electronics
- MP3 Players
How can I achieve this in a DropDownList ? My current code for retrieving and displaying is following respectively :-
public ActionResult Create()
{
ViewBag.ParentCategoryID = new SelectList(db.Categories, "CategoryID", "CategoryName");
return View();
}
CSHTML
<div class="editor-field">
@Html.DropDownList("ParentCategoryID", String.Empty)
@Html.ValidationMessageFor(model => model.ParentCategoryID)
</div>
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看来您需要 optgroups。不幸的是，MVC 对此没有本机支持。因此，正如下面的文章中提到的，您可以自己编写一个：
ASP .Net MVC 3：Html.DropDownListFor 中的 optgroup 支持
It looks like you need optgroups. Unfortunately MVC has no native support for this. So as mentioned in the following post you can write one yourself:
ASP.Net MVC 3: optgroup support in Html.DropDownListFor