@Html.DropDownListFor(m => m.branch, CommonMethod.getBranch("",Model.branch), "--Select--", new { @multiple = "multiple" })
@Html.DropDownListFor(m => m.division, CommonMethod.getDivision(Model.branch,Model.division), "--Select--", new { @multiple = "multiple" })
我有DropDownListFor的两个实例。 我想设置选择为真为那些以前存储的值Model.branch和Model.division。 这些是存储ID的字符串数组
class CommonMethod
{
public static List<SelectListItem> getDivision(string [] branchid , string [] selected)
{
DBEntities db = new DBEntities();
List<SelectListItem> division = new List<SelectListItem>();
foreach (var b in branchid)
{
var bid = Convert.ToByte(b);
var div = (from d in db.Divisions where d.BranchID == bid select d).ToList();
foreach (var d in div)
{
division.Add(new SelectListItem { Selected = selected.Contains(d.DivisionID.ToString()), Text = d.Description, Value = d.DivisionID.ToString() });
}
}
}
return division;
}
}
除法的返回值被选择为真模型中的所选择的项目,但在观看侧它没有被选中。
使用ListBoxFor
代替DropDownListFor
:
@Html.ListBoxFor(m => m.branch, CommonMethod.getBranch("", Model.branch), "--Select--")
@Html.ListBoxFor(m => m.division, CommonMethod.getDivision(Model.branch, Model.division), "--Select--")
该branch
和division
性显然必须将包含所选值的集合。
和使用视图模型来构建一个多选下拉有道一个完整的例子:
public class MyViewModel
{
public int[] SelectedValues { get; set; }
public IEnumerable<SelectListItem> Values { get; set; }
}
这将在控制器中填充:
public ActionResult Index()
{
var model = new MyViewModel();
// preselect items with values 2 and 4
model.SelectedValues = new[] { 2, 4 };
// the list of available values
model.Values = new[]
{
new SelectListItem { Value = "1", Text = "item 1" },
new SelectListItem { Value = "2", Text = "item 2" },
new SelectListItem { Value = "3", Text = "item 3" },
new SelectListItem { Value = "4", Text = "item 4" },
};
return View(model);
}
并在视图:
@model MyViewModel
...
@Html.ListBoxFor(x => x.SelectedValues, Model.Values)
这是HTML帮手,它会自动预选值符合那些的项目SelectedValues
财产。
对我来说,它的工作原理也为@Html.DropDownListFor
:
模型:
public class MyViewModel
{
public int[] SelectedValues { get; set; }
public IEnumerable<SelectListItem> Values { get; set; }
}
控制器:
public ActionResult Index()
{
var model = new MyViewModel();
// the list of available values
model.Values = new[]
{
new SelectListItem { Value = "2", Text = "2", Selected = true },
new SelectListItem { Value = "3", Text = "3", Selected = true },
new SelectListItem { Value = "6", Text = "6", Selected = true }
};
return View(model);
}
剃刀:
@Html.DropDownListFor(m => m.SelectedValues, Model.Values, new { multiple = "true" })
在控制器提交SelectedValues的样子: