Ниже приведен пример для банка и филиалов.Вы можете попробовать что-то
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width"/>
<title>Index</title>
</head>
<body>
@using (Html.BeginForm("Index", "Home", FormMethod.Post))
{
@Html.DropDownListFor(m => m.bank, Model.bank, "Please select", new { onchange = "document.forms[0].submit();" })
<br/>
<br/>
@Html.DropDownListFor(m => m.branches, Model.branches, "Please select", new { disabled = "disabled" })
<br/>
<br/>
<input type="submit" value="Submit"/>
}
<script src="~/Scripts/jquery-1.10.2.min.js"></script>
<script type="text/javascript">
$(function () {
if ($("#bank option").length > 1) {
$("#bank").removeAttr("disabled");
}
if ($("#branches option").length > 1) {
$("#branches").removeAttr("disabled");
}
if ($("#bank").val() != "" && $("#branches").val() != "") {
var message = "Bank: " + $("#CountryId option:selected").text();
message += "\nbranck: " + $("#StateId option:selected").text();
alert(message);
}
});
</script>
</body>
</html>
public class HomeController : Controller
{
// GET: Home
public ActionResult Index()
{
// populate bank values
foreach (var bankent in entities.bank)
{
model.bank.Add(new SelectListItem { Text = bankent.bank, Value = bankent.id.ToString() });
}
return View(model);
}
[HttpPost]
public ActionResult Index(int? bank)
{
// populate bank values
foreach (var bankent in entities.bank)
{
model.bank.Add(new SelectListItem { Text = bankent.bank, Value = bankent.id.ToString() });
}
if (bank.HasValue)
{
//populate branches based on bank id
foreach (var state in branches)
{
model.branches.Add(new SelectListItem { Text = state.branches, Value = state.StateId.ToString() });
}
}
return View(model);
}
}
для более подробной проверки Заполнить один DropDownList на основе другого выбранного значения DropDownList в ASP.Net MVC