Question

我的视图中有三个下拉框，代码为

public class IntFoo implements Foo<Integer>
{
    public <synthetic> <bridge> Object moo()
    {
        return Integer.valueOf(this.moo());
    }

    public int moo()
    {
        return 0;
    }
}

我的控制器GET操作方法是

IntFoo intFoo = new IntFoo();
Foo<Integer> foo = intFoo;
Integer i = foo.moo(); // calls the synthetic method, which boxes the result of the actual implementation

在数据库中，@Html.DropDownList("EventGroupTitle", ViewData["groupList"] as List<SelectListItem>, new { @class = "form-control" }) @Html.DropDownList("EventGroupName", ViewData["groupNameList"] as List<SelectListItem>, new { @class = "form-control" }) @Html.DropDownList("EventTypeOne", ViewData["typeList"] as List<SelectListItem>, new { @class = "form-control" })和public ActionResult Create() { List<SelectListItem> liEventGroups = new List<SelectListItem>(); List<SelectListItem> liEventTypes = new List<SelectListItem>(); List<SelectListItem> liEventGroupNames = new List<SelectListItem>(); // pull results from DB and assign them to the above variables ViewData["typeList"] = liEventTypes; ViewData["groupList"] = liEventGroups; ViewData["groupNameList"] = liEventGroupNames; return View(); }之间存在一对多的关系。例如，组标题可以是EventGroupTitle，组名称可以是EventGroupNames，Doctor。另一个组标题为Dr Joe，因此组名称为Dr Adrian，Nurse。

没有实际的外键设置，但Nurse Daniel中有一个字段说明Nurse Dave是什么。

那么有没有办法对Dropbox进行某种过滤？如果他们在第一个保管箱中选择GroupNames，那么我只希望医生出现在第二个保管箱中。

Answer 1

我在这里创建了级联下拉式html帮助器。它以nuget package形式提供，测试的源代码在github上。

用法非常简单。例如，您有一个国家/地区的城市下拉菜单使用以下模型：

<强>模型：

public class Model
{
    public int SelectedCountry {get;set;}
    public IList<SelectListItem> Countries {get;set;}
    public int SelectedCity {get;set;} 
}

<强>控制器

public ActionResult GetCities(int country)
{
   //return IList<SelectListItem> of Cities based on a country that you get as a parameter
}

查看

//First simple dropdown @Html.DropDownListFor(m=>m.SelectedCountry, Model.Countries, "Please select a Country", new {@class="form-control"}) //Dropdown list for SelectedCity property that depends on selection of SelectedCountry property @Html.CascadingDropDownListFor( expression: m => m.SelectedCity, triggeredByProperty: m => m.SelectedCountry, //Parent property that trigers dropdown data loading url: Url.Action("GetCities", "Home"), //Url of action that returns dropdown data actionParam: "country", //Parameter name for the selected parent value that url action receives optionLabel: "Please select a City", // Option label disabledWhenParrentNotSelected: true, //If true, disables dropdown until parrent dropdown selected htmlAttributes: new { @class = "form-control" }) //Html attributes

如何根据mvc过滤下拉框

1 个答案: