这是第一使用Jquery实现城市三级数据联动的实例！之前本人没有使用过Jquery，在WebForm的开发过程中，很多时候用的是ASP.NET Ajax,ajaxPro +JavaScript,从未使用过JS框架，最近在学习ASP.NET MVC,在最新的发布版本中，已经集成了Jquery 1.3.1，自然，也要学一学！发现使用Jquery代码果然写得比原始JS优雅！只是语法和方法太多，现在还没弄熟，还需要时间来学习．．．．．这次是第一次使用Jquery写客户端脚本，如果大家发现更好的实现方法，请给我留言！谢谢！
注明：ASP.NET MVC 1.0 ,作者:0x001;
View:
<script type="text/javascript">
$(document).ready(function() {
GetByJquery();
$("#ddlProvince").change(function() { GetCity() });
$("#ddlCity").change(function() { GetDistrict() });
});
function GetByJquery() {
$("#ddlProvince").empty(); //清空省份SELECT控件
$.getJSON("/ajax/GetProvinceList", function(data) {
$.each(data, function(i, item) {
$("<option></option>")
.val(item["ProvinceID"])
.text(item["ProvinceName"])
.appendTo($("#ddlProvince"));
});
GetCity();
});
}
function GetCity() {
$("#ddlCity").empty(); //清空城市SELECT控件
var url ="/ajax/GetCityList/" + $("#ddlProvince").val();
$.getJSON(url, function(data) {
$.each(data, function(i, item) {
$("<option></option>")
.val(item["CityID"])
.text(item["CityName"])
.appendTo($("#ddlCity"));
});
GetDistrict();
});
}
function GetDistrict() {
$("#ddlDistrict").empty(); //清空市区SELECT控件
var url = "/ajax/GetDistrictList/" + $("#ddlCity").val();
$.getJSON(url, function(data) {
$.each(data, function(i, item) {
$("<option></option>")
.val(item["DistrictID"])
.text(item["DistrictName"])
.appendTo($("#ddlDistrict"));
});
});
}
</script>
<table><tr><td><select id="ddlProvince"/></td><td><select id="ddlCity"/></td><td><select id="ddlDistrict" /></td></tr></table>
Controller :
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.Web.Mvc.Ajax;
namespace MvcBBS.Controllers
{
public class AjaxController : Controller
{
//
// GET: /Ajax/
/// <summary>
/// 获取所有［省份］数据
/// </summary>
public ActionResult GetProvinceList()
{
if (!Request.IsAjaxRequest())
{
return Content("请不要非法方法,这是不道德的行为！");
}
BLL.Province bll = new MvcBBS.BLL.Province();
List<MvcBBS.Model.S_Province> modellist = bll.GetProvinceList();
return Json(modellist);
}
/// <summary>
/// 获取某［省份］的所有［城市］数据
/// </summary>
public ActionResult GetCityList(int id)
{
if (!Request.IsAjaxRequest())
{
return Content("请不要非法方法,这是不道德的行为！");
}
BLL.Province bll = new MvcBBS.BLL.Province();
List<MvcBBS.Model.S_City> modellist = bll.GetCityList(id);
return Json(modellist);
}
/// <summary>
/// 获取某［城市］的所有［市区］数据
/// </summary>
public ActionResult GetDistrictList(int id)
{
if (!Request.IsAjaxRequest())
{
return Content("请不要非法方法,这是不道德的行为！");
}
BLL.Province bll = new MvcBBS.BLL.Province();
List<MvcBBS.Model.S_District> modellist = bll.GetDistrict(id);
return Json(modellist);
}
}
}
我比较喜欢使用三层＋工厂模式来读写数据，O/R Mapping不太适合我的要求！我们写的项目经常不是为了方便移植，而是选择明确的数据库，需要更高的性能，更强的业务逻辑！大家看到上面的代码，应该很熟悉，从数据库读数据到List<>中返回，并使有ASP.NET MVC内置的Json方法转换数据并Response．
DAL:
// BLL,Model就不贴出来了！
using System;
using System.Data;
using System.Text;
using System.Data.SqlClient;
using System.Collections.Generic;
using DBUtility;//请先添加引用
namespace MvcBBS.DAL
{
public class Province
{
public Province()
{}
/// <summary>
/// 获取所有省份数据
/// </summary>
/// <returns></returns>
public List<Model.S_Province> GetProvinceList()
{
StringBuilder strSql = new StringBuilder();
strSql.Append("SELECT ProvinceID,ProvinceName ");
strSql.Append(" FROM S_Province ");
List<Model.S_Province> modelList = new List<MvcBBS.Model.S_Province>();
SqlDataReader dr = DbHelperSQL.ExecuteReader(strSql.ToString());
while (dr.Read())
{
Model.S_Province _model = new MvcBBS.Model.S_Province();
_model.ProvinceID = int.Parse(dr["ProvinceID"].ToString());
_model.ProvinceName = dr.GetString(1);
modelList.Add(_model);
}
dr.Close();
return modelList;
}
/// <summary>
/// 获取某省份的所有城市数据
/// </summary>
/// <param name="ProvinceID"></param>
/// <returns></returns>
public List<Model.S_City> GetCityList(int ProvinceID)
{
StringBuilder strSql = new StringBuilder();
strSql.Append("SELECT CityID,CityName,ZipCode");
strSql.Append(" FROM S_City ");
strSql.Append(" WHERE ProvinceID=");
strSql.Append(ProvinceID.ToString());
List<Model.S_City> modelList = new List<MvcBBS.Model.S_City>();
SqlDataReader dr = DbHelperSQL.ExecuteReader(strSql.ToString());
while (dr.Read())
{
Model.S_City _model = new MvcBBS.Model.S_City();
_model.CityID = int.Parse(dr["CityID"].ToString());
_model.CityName = dr.GetString(1);
_model.ZipCode = dr.GetString(2);
_model.ProvinceID = ProvinceID;
modelList.Add(_model);
}
dr.Close();
return modelList;
}
/// <summary>
/// 获取某城市的所有市区
/// </summary>
/// <param name="CityID"></param>
/// <returns></returns>
public List<Model.S_District> GetDistrict(int CityID)
{
StringBuilder strSql = new StringBuilder();
strSql.Append("SELECT DistrictID,DistrictName");
strSql.Append(" FROM S_District ");
strSql.Append(" WHERE CityID=");
strSql.Append(CityID.ToString());
List<Model.S_District> modelList = new List<MvcBBS.Model.S_District>();
SqlDataReader dr = DbHelperSQL.ExecuteReader(strSql.ToString());
while (dr.Read())
{
Model.S_District _model = new MvcBBS.Model.S_District();
_model.DistrictID = int.Parse(dr["DistrictID"].ToString());
_model.DistrictName = dr.GetString(1);
_model.CityID = CityID;
modelList.Add(_model);
}
dr.Close();
return modelList;
}
}
}