ASP.Net MVC多个下拉菜单，单列表，仅允许唯一选择 [英] ASP.Net MVC Multiple Drop Downs, Single List, Only Allow Unique Selections

问题描述

我正在创建一个ASP.Net MVC 4网站，其中有一个控制器创建操作。

I am creating an ASP.Net MVC 4 site where I have a controller with a create action.

创建操作提供了一个视图，其中包含几个下拉列表我想从我的数据库绑定到单个实体列表。

The Create action provides a View with several dropdowns each of which I want to bind to a single list of entities from my database.

但是，我想确保每个下拉菜单中的选择是唯一的。

However, I want to ensure that the selections in each drop down are unique.

关于这样做？每次进行选择时，我需要对服务器进行一些AJAX回发，以便以某种方式更新其他下拉菜单中的可用选项？还是有一个简单的方法？

How would I go about doing this? Do I need to do some sort of AJAX postback to the server each time a selection is made to somehow update the available options on each of the other drop downs? Or is there a simpler way?

非常感谢，

Martyn Jones。

Martyn Jones.

推荐答案

在您的模型中，您可以为每个下拉菜单单个Id字段。
如下

In your model you can have individual Id fields for each Dropdown. something as below

<%: Html.DropDownListFor(model => model.DropwdownId1,Model.DropdownEntities) %>
<%: Html.DropDownListFor(model => model.DropwdownId2,Model.DropdownEntities) %>
<%: Html.DropDownListFor(model => model.DropwdownId3,Model.DropdownEntities) %>

其中 Dropdownentities 只会从数据库返回实体。

where Dropdownentities will just return entities from database.

您将能够看到Post Action中每个下拉菜单的选定值。
DropwdownId1，DropwdownId2

you shall be able to see selected values for each dropdown in Post Action. DropwdownId1 , DropwdownId2

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