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本文记录了一个在MVC4中使用PartialView实现级联效果的小例子。
首先准备一下要级联的数据，新建两个类：Province和City
public class Province { public string Id { get; set; } public string Name { get; set; } } public class City { public string Id { get; set; } public string Name { get; set; } public string Province { get; set; } }
并在Controller中准备好数据，
List<Province> provinceList = new List<Province>(); List<City> cityList = new List<City>(); private void InitData() { provinceList.Add(new Province { Id = "1", Name = "河北省" }); provinceList.Add(new Province { Id = "2", Name = "河南省" }); provinceList.Add(new Province { Id = "3", Name = "广东省" }); cityList.Add(new City { Id = "11", Name = "石家庄", Province = "1" }); cityList.Add(new City { Id = "12", Name = "邢台", Province = "1" }); cityList.Add(new City { Id = "13", Name = "保定", Province = "1" }); cityList.Add(new City { Id = "21", Name = "郑州", Province = "2" }); cityList.Add(new City { Id = "22", Name = "安阳", Province = "2" }); cityList.Add(new City { Id = "23", Name = "洛阳", Province = "2" }); cityList.Add(new City { Id = "31", Name = "广州", Province = "3" }); cityList.Add(new City { Id = "32", Name = "中山", Province = "3" }); cityList.Add(new City { Id = "33", Name = "佛山", Province = "3" }); }
在控制器中创建一个返回分步视图的Action，在前台第一级调用的时候触发这个action，返回第二级需要的数据。
public ActionResult ShowCity(string provinceId) { InitData(); var result = cityList.Where(city => city.Province == provinceId); ViewBag.City = result; return PartialView("PartialCity"); }
先创建一个PartialView：PartialCity.cshtml，如下：
@{ ViewBag.Title = "PartialCity"; } 城市: @Html.DropDownList("city_dropdownlist", new SelectList(ViewBag.City, "Id", "Name"))
在主View中的使用这个PartialView，
<div id="province"> 省份: @Html.DropDownList("province_dropdownlist", new SelectList(ViewBag.Province, "Id", "Name")) </div> <div id="city"> @Html.Partial("PartialCity") </div>
最后，需要在主View页面写几行js代码，给第一级dropdownlist注册一个change事件，并且在事件触发的时候调用刚刚创建的ShowCity方法
@Scripts.Render("~/Scripts/jquery-1.7.1.min.js"); <script type="text/javascript"> $(document).ready(init); function init() { $("select[name=‘province_dropdownlist‘]").change(function () { var selectedProvince = $(this).val(); ShowCityWithSelectedProvince(selectedProvince); }); } function ShowCityWithSelectedProvince(province) { $.ajax({ url: "@Url.Action("ShowCity", "Home")", data: { provinceId: province }, success: function (data) { $("#city").html(data); } }); }
这样，就实现了级联效果。
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原文地址：http://www.cnblogs.com/ldm1989/p/4208349.html
