嗨请协助以下方面。我有一个下拉列表，其中填充了城镇，我创建了一个MVC项目，我有一个控制器操作，获取在第一个下拉列表中选择的城镇的郊区，但是我的代码似乎失败，请协助。见下面的代码。
控制器方法。
public JsonResult GetSurburbs(string id)
{
List<SelectListItem> states = new List<SelectListItem>();
switch (id)
{
//Alberton surbubs
case "1":
states.Add(new SelectListItem { Text = "Select", Value = "0" });
states.Add(new SelectListItem { Text = "ALBERANTE", Value = "1" });
states.Add(new SelectListItem { Text = "ALBERTON", Value = "2" });
states.Add(new SelectListItem { Text = "ALBERTSDAL", Value = "3" });
states.Add(new SelectListItem { Text = "ALRODE", Value = "4" });
states.Add(new SelectListItem { Text = "ALRODE SOUTH", Value = "5" });
states.Add(new SelectListItem { Text = "ARTON", Value = "6" });
states.Add(new SelectListItem { Text = "BASSONIA ROCK", Value = "7" });
states.Add(new SelectListItem { Text = "BRACKENDOWNS", Value = "8" });
states.Add(new SelectListItem { Text = "BRACKENHURST", Value = "9" });
states.Add(new SelectListItem { Text = "EDEN PARK", Value = "10" });
states.Add(new SelectListItem { Text = "EDEN PARK WEST", Value = "11" });
states.Add(new SelectListItem { Text = "ELANDSFONTEIN 108-IR", Value = "12" });
states.Add(new SelectListItem { Text = "FLORENTIA", Value = "13" });
states.Add(new SelectListItem { Text = "GENERAAL ALBERTSPARK", Value = "14" });
states.Add(new SelectListItem { Text = "GREENFIELDS", Value = "15" });
states.Add(new SelectListItem { Text = "KLIPRIVIERSBERG 106-IR", Value = "16" });
states.Add(new SelectListItem { Text = "KROMVLEI 142-IR", Value = "17" });
states.Add(new SelectListItem { Text = "LINMEYER", Value = "18" });
states.Add(new SelectListItem { Text = "MAYBERRY PARK", Value = "19" });
states.Add(new SelectListItem { Text = "MAYRO PARK", Value = "20" });
states.Add(new SelectListItem { Text = "MEYERSDAL", Value = "21" });
states.Add(new SelectListItem { Text = "MEYERSDAL NATURE ESTATE", Value = "22" });
states.Add(new SelectListItem { Text = "MPILISWENI", Value = "23" });
states.Add(new SelectListItem { Text = "NEW MARKET AH", Value = "24" });
states.Add(new SelectListItem { Text = "NEW MARKET MANOR", Value = "25" });
states.Add(new SelectListItem { Text = "NEW MARKET PARK", Value = "26" });
states.Add(new SelectListItem { Text = "NEW REDRUTH", Value = "27" });
states.Add(new SelectListItem { Text = "OTHANDWENI", Value = "28" });
states.Add(new SelectListItem { Text = "PALMIETFONTEIN 141-IR", Value = "29" });
states.Add(new SelectListItem { Text = "PHOLA PARK", Value = "30" });
states.Add(new SelectListItem { Text = "RACEVIEW", Value = "31" });
states.Add(new SelectListItem { Text = "RANDHART", Value = "32" });
states.Add(new SelectListItem { Text = "ROODEKOP 139-IR", Value = "33" });
states.Add(new SelectListItem { Text = "ROOIKOP 140-IR", Value = "34" });
states.Add(new SelectListItem { Text = "ROXTON", Value = "35" });
states.Add(new SelectListItem { Text = "SOUTHCREST", Value = "36" });
states.Add(new SelectListItem { Text = "SOUTHDOWNS", Value = "37" });
states.Add(new SelectListItem { Text = "THINASONKE", Value = "38" });
states.Add(new SelectListItem { Text = "THINTWA VILLAGE", Value = "39" });
states.Add(new SelectListItem { Text = "TOKOZA", Value = "40" });
states.Add(new SelectListItem { Text = "TOKOZA 198-IR", Value = "41" });
states.Add(new SelectListItem { Text = "VERWOERDPARK", Value = "42" });
states.Add(new SelectListItem { Text = "WATERVALSPRUIT", Value = "43" });
states.Add(new SelectListItem { Text = "WATERVAL 150-IR", Value = "44" });
states.Add(new SelectListItem { Text = "ZWARTKOPJES 143-IR", Value = "45" });
break;
//Bedfordview surbubs
case "2":
states.Add(new SelectListItem { Text = "Select", Value = "0" });
states.Add(new SelectListItem { Text = "BEDFORD 62-IR", Value = "1" });
states.Add(new SelectListItem { Text = "BEDFORD 68-IR", Value = "2" });
states.Add(new SelectListItem { Text = "BEDFORD GARDENS", Value = "3" });
states.Add(new SelectListItem { Text = "BEDFORD PARK", Value = "4" });
states.Add(new SelectListItem { Text = "BEDFORDVIEW", Value = "5" });
states.Add(new SelectListItem { Text = "ELANDSFONTEIN 90-IR", Value = "6" });
states.Add(new SelectListItem { Text = "ESSEXWOLD", Value = "7" });
states.Add(new SelectListItem { Text = "GELDENHUIS ESTATE SH", Value = "8" });
states.Add(new SelectListItem { Text = "MALVERN EAST", Value = "9" });
states.Add(new SelectListItem { Text = "MORNINGHILL", Value = "10" });
states.Add(new SelectListItem { Text = "OOSPOORT", Value = "11" });
states.Add(new SelectListItem { Text = "ORIEL", Value = "12" });
states.Add(new SelectListItem { Text = "SENDERWOOD", Value = "13" });
states.Add(new SelectListItem { Text = "ST ANDREWS", Value = "14" });
break;
//Benoni surbubs
case "3":
// break;
}
return Json(new SelectList(states, "Value", "Text"), JsonRequestBehavior.AllowGet);
}
以下是我对dropdpnws
的html助手的看法<div class="form-group">
@Html.LabelFor(m => m.Town, new { @class = "col-md-2 control-label" })
<div class="col-md-10">
@*@Html.DropDownListFor(model => model.Town, new SelectList(new string[] { "Alberton", "Bedfordview", "Benoni", "Boksburg", "Brakpan", "Edenvale", "Germiston", "Isando", "OR Tambo Airport", "Kempton Park", "Nigel", "OR Tambo International", "Springs" }))*@
@Html.DropDownList("Town", new SelectList(new string[] { "Alberton", "Bedfordview", "Benoni", "Boksburg", "Brakpan", "Edenvale", "Germiston", "Isando", "OR Tambo Airport", "Kempton Park", "Nigel", "OR Tambo International", "Springs" }))
</div>
</div>
<div class="form-group">
@Html.Label("Surburb", new { @class = "col-md-2 control-label" })
<div class="col-md-10">
@Html.DropDownList("Surburb", new SelectList(string.Empty, "Value", "Text"), "Please select a Surburb", new { style = "width:250px", @class = "dropdown1" })
</div>
</div>
这是我的Jquery代码来填充数据。
<script type="text/javascript">
$(document).ready(function () {
//Dropdownlist Selectedchange event
$("#Town").change(function () {
$("#Surburb").empty();
$.ajax({
type: 'GET',
url: '@Url.Action("GetSurburbs")', // we are calling json method
dataType: 'json',
data: { id: $("#Town").val() },
// here we are get value of selected country and passing same value
success: function (states) {
// states contains the JSON formatted list
// of states passed from the controller
$.each(states, function (i, state) {
$("#Surburb").append('<option value="' + state.Value + '">' +
state.Text + '</option>');
// here we are adding option for States
});
},
error: function (ex) {
alert('Failed to retrieve Surburbs.' + ex);
}
});
return false;
})
});
代码失败，Jquery，Failed rto retrive Suburbs中有例外，请帮助我。
答案 0 :(得分：0)
也许您需要将id放入网址：
url: '@(Url.Action("GetSurburbs"))?id=' + $("#Town").val(),
您的浏览器的F12开发者工具会有所帮助。它显示来自服务器的请求和响应，因此您可以看到正在发生的事情。