MVC二级联动使用$.getJSON方法

本篇使用jQuery的$.getJSON()实现二级联动。

 

□ View Models

   1:  namespace MvcApplication1.Models

   2:  {

   3:      public class Province

   4:      {

   5:          public int ID { get; set; }

   6:          public string Name { get; set; }

   7:      }

   8:   

   9:      public class City 

  10:      {

  11:          public int ID { get; set; }

  12:          public int ProvinceID { get; set; }

  13:          public string Name { get; set; }

  14:          public string ZipCode { get; set; }

  15:      }

  16:  }

  17:   

.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }

 

□ 模拟一个服务层获取数据

   1:  using System.Collections.Generic;

   2:  using System.Linq;

   3:  using MvcApplication1.Models;

   4:   

   5:  namespace MvcApplication1

   6:  {

   7:      public static class Service

   8:      {

   9:          public static List<Province> GetProvices()

  10:          {

  11:              List<Province> result = new List<Province>();

  12:              result.Add(new Province(){ID = 1,Name = "山东省"});

  13:              result.Add(new Province(){ID = 2,Name = "江苏省"});

  14:              return result;

  15:          }

  16:   

  17:          public static List<City> GetCitiesByProvince(int provinceId)

  18:          {

  19:              List<City> result = new List<City>();

  20:              result.Add(new City(){ID=1,Name = "济南市",ProvinceID = 1,ZipCode = "001"});

  21:              result.Add(new City() { ID = 2, Name = "青岛市", ProvinceID = 1, ZipCode = "002"});

  22:              result.Add(new City() { ID = 3, Name = "南京市", ProvinceID = 2, ZipCode = "003" });

  23:              result.Add(new City() { ID = 4, Name = "苏州市", ProvinceID = 2, ZipCode = "004" });

  24:   

  25:              return result.Where(r => r.ProvinceID == provinceId).ToList();

  26:          }

  27:      }

  28:  }

  29:   

.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }

 

□ HomeController

遍历集合，以List<SelectListItem>返回给前台视图。

   1:  using System;

   2:  using System.Collections.Generic;

   3:  using System.Web.Mvc;

   4:  using MvcApplication1.Models;

   5:   

   6:  namespace MvcApplication1.Controllers

   7:  {

   8:      public class HomeController : Controller

   9:      {

  10:          public ActionResult Index()

  11:          {

  12:              return View();

  13:          }

  14:   

  15:          public JsonResult GetProvinces()

  16:          {

  17:              List<SelectListItem> items = new List<SelectListItem>();

  18:              var provinces = Service.GetProvices();

  19:              foreach (Province p in provinces)

  20:              {

  21:                  items.Add(new SelectListItem()

  22:                  {

  23:                      Text = p.Name,

  24:                      Value = Convert.ToString(p.ID)

  25:                  });

  26:              }

  27:              if (!items.Count.Equals(0))

  28:              {

  29:                  items.Insert(0, new SelectListItem(){Text = "请选择",Value = ""});

  30:              }

  31:              return Json(items, JsonRequestBehavior.AllowGet);

  32:          }

  33:   

  34:          public JsonResult GetCities(string id)

  35:          {

  36:              List<SelectListItem> items = new List<SelectListItem>();

  37:              if (!string.IsNullOrEmpty(id))

  38:              {

  39:                  var cities = Service.GetCitiesByProvince(int.Parse(id));

  40:                  foreach (City c in cities)

  41:                  {

  42:                      items.Add(new SelectListItem()

  43:                      {

  44:                          Text = string.Concat(c.ZipCode, " ",c.Name),

  45:                          Value = c.ID.ToString()

  46:                      });

  47:                  }

  48:                  if (!items.Count.Equals(0))

  49:                  {

  50:                      items.Insert(0, new SelectListItem(){Text = "请选择",Value = ""});

  51:                  }

  52:              }

  53:              return Json(items, JsonRequestBehavior.AllowGet);

  54:          }

  55:          

  56:      }

  57:  }

  58:   

.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }

 

□ Home/Index.cshtml视图

   1:  @{

   2:      ViewBag.Title = "Index";

   3:      Layout = "~/Views/Shared/_Layout.cshtml";

   4:  }

   5:   

   6:  选择省：<select id="p"></select> <br/>

   7:  选择市：<select id="c"></select>

   8:   

   9:  @section scripts

  10:  {

  11:      <script type="text/javascript">

  12:          $(function() {

  13:              getProvince();

  14:   

  15:              $('#p').change(function() {

  16:                  changeCity();

  17:              });

  18:          });

  19:   

  20:          //加载省

  21:          function getProvince() {

  22:              $.getJSON('@Url.Action("GetProvinces","Home")', function (data) {

  23:                  $('#p').empty();

  24:                  $.each(data, function(i, item) {

  25:                      $('#p').append($('<option></option>').val(item.Value).text(item.Text));

  26:                  });

  27:              });

  28:          }

  29:   

  30:          //设置城市清空

  31:          function emptyCity() {

  32:              $('#c').empty();

  33:              $('#c').append($('<option></option>').val('').text('请选择'));

  34:          }

  35:   

  36:          //根据省加载城市

  37:          function changeCity() {

  38:              var selectedProvinceId = $.trim($('#p option:selected').val());

  39:              if (selectedProvinceId.length == 0) {

  40:                  emptyCity();

  41:              } else {

  42:                  $.getJSON('@Url.Action("GetCities","Home")', { id: selectedProvinceId }, function (data) {

  43:                      $('#c').empty();

  44:                      $.each(data, function(i, item) {

  45:                          $('#c').append($('<option></option>').val(item.Value).text(item.Text));

  46:                      });

  47:                  });

  48:              }

  49:          }

  50:      </script>

  51:  }

  52:   

.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }

 

结果：

参考资料：

※ Kevin Tseng