多级联动实现，附源码。当前，部分代码是参与博客园其它网友。
新增，前台代码：
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<script src="~/Scripts/jquery-1.10.2.js"></script><script type="text/javascript"> $(function () { GetProvince(); //加载省份 $("#Province").change(function () { GetCity(); }); }); function GetProvince() { // $("#Province").empty(); $.getJSON( "/Home/GetProvincelist", function (data) { $.each(data, function (i, item) { $("<option></option>").val(item["PID"]).text(item["ProvinceName"]).appendTo($("#Province")); }) }); // GetCity(); } function GetCity() { $("#City").empty(); $.getJSON( "/Home/GetCitylist", { pid: $("#Province").val() }, function (data) { $.each(data, function (i, item) { $("<option></option>").val(item["Value"]).text(item["Text"]).appendTo($("#City")); }) }); }</script><div style="margin:50px 0"> <span>省份：</span> <select id="Province"> <option>请选择</option> </select> <span>市：</span> <select id="City"> <option>请选择</option> </select></div> |
后台代码：
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/// <summary>/// 模拟省份数据/// </summary>/// <returns></returns>public List<Province> Provincelist(){ List<Province> list = new List<Province>(); list.Add(new Province() { PID = 1, ProvinceName = "广东" }); list.Add(new Province() { PID = 2, ProvinceName = "北京" }); list.Add(new Province() { PID = 3, ProvinceName = "上海" }); list.Add(new Province() { PID = 4, ProvinceName = "河北" }); list.Add(new Province() { PID = 5, ProvinceName = "贵州" }); list.Add(new Province() { PID = 6, ProvinceName = "云南" }); return list;}/// <summary>/// 模拟城市数据/// </summary>/// <returns></returns>public List<City> Citylist(){ List<City> cityList = new List<City>(); cityList.Add(new City() { CID = 1, PID = 1, CityName = "广州" }); cityList.Add(new City() { CID = 2, PID = 1, CityName = "深圳" }); cityList.Add(new City() { CID = 3, PID = 1, CityName = "惠州" }); cityList.Add(new City() { CID = 4, PID = 1, CityName = "湛江" }); cityList.Add(new City() { CID = 5, PID = 2, CityName = "北京" }); cityList.Add(new City() { CID = 6, PID = 3, CityName = "上海" }); cityList.Add(new City() { CID = 7, PID = 4, CityName = "唐山市" }); cityList.Add(new City() { CID = 8, PID = 4, CityName = "保定市" }); cityList.Add(new City() { CID = 9, PID = 4, CityName = "张家口市" }); return cityList;}/// <summary>/// 获取省份/// </summary>public JsonResult GetProvincelist(){ var list = Provincelist(); return Json(list, JsonRequestBehavior.AllowGet);}/// <summary>/// 获取城市/// </summary>/// <param name="pid"></param>/// <returns></returns>public JsonResult GetCitylist(int pid){ var citys = Citylist().Where(m => m.PID == pid).ToList(); List<SelectListItem> item = new List<SelectListItem>(); foreach (var City in citys) { item.Add(new SelectListItem { Text = City.CityName, Value = City.CID.ToString() }); } return Json(item, JsonRequestBehavior.AllowGet);} |
编辑逻辑：
模型ProvinceViewModel：
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public class ProvinceViewModel{ /// <summary> /// 省份ID /// </summary> public int PID { get; set; } /// <summary> /// 城市ID /// </summary> public int CID { get; set; }} |
前台：
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<script src="~/Scripts/jquery-1.10.2.js"></script><script type="text/javascript"> $(function () { //GetProvince(); //加载省份 GetCity(); //省份变动，加载城市 $("#Province").change(function () { GetCity(); }); }); function GetProvince() { // $("#Province").empty(); $.getJSON( "/Home/GetProvincelist", function (data) { $.each(data, function (i, item) { $("<option></option>").val(item["PID"]).text(item["ProvinceName"]).appendTo($("#Province")); }) }); // GetCity(); } function GetCity() { $("#City").empty(); $.getJSON( "/Home/GetCitylist", { pid: $("#Province").val() }, function (data) { $.each(data, function (i, item) { $("<option></option>").val(item["Value"]).text(item["Text"]).appendTo($("#City")); }) }); }</script><div style="margin:50px 0"> <span>省份：</span> @Html.DropDownListFor(model => model.PID, ViewBag.ProvinceList as IEnumerable<SelectListItem>, "＝请选择＝", new { @class = "form-control", id = "Province" }) <span>市：</span> @Html.DropDownListFor(model => model.CID,ViewBag.CityList as IEnumerable<SelectListItem>, "＝请选择＝", new { @class = "form-control", id = "City" })</div> |
后台：
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public ActionResult Edit(){ ViewBag.ProvinceList = Provincelist().Select(m => new SelectListItem() { Text = m.ProvinceName, Value = m.PID.ToString(), Selected = (m.PID == 4) //测试，默认让它绑定第四个 }).ToList(); ViewBag.CityList = Citylist().Select(m => new SelectListItem() { Text = m.CityName, Value = m.CID.ToString(), Selected = (m.CID == 8) //测试，默认让它绑定第四个 }).ToList(); return View();} |
实际上，增加和编辑是完成可以合成同一个页面的，这里就不演示了。