在线测试例子:http://vazumi.net.s1.kingidc.net/example/combobox.aspx 效果截图: 后台数据库是sql2k,一共一张表,3级联动是通过匹配code来搞 前台代码: %@ Page Language=C# AutoEventWireup=true CodeBehind=combobox.aspx.cs Inherits=test.example.combo

在线测试例子:

http://vazumi.net.s1.kingidc.net/example/combobox.aspx

效果截图:

后台数据库是sql2k,一共一张表,3级联动是通过匹配code来搞

前台代码:

区域选择:

json监视:

后台引用ashx里的代码:

using System;

using System.Collections;

using System.Data;

using System.Linq;

using System.Web;

using System.Web.Services;

using System.Web.Services.Protocols;

using Newtonsoft.Json;

using Newtonsoft.Json.Converters;

using System.Data.Sql;

using System.Data.SqlClient;

using System.Configuration;

namespace test.service

{

/// /// $codebehindclassname$ 的摘要说明

///

[WebService(Namespace = "http://tempuri.org/")]

[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]

public class DataHandler : IHttpHandler

{

HttpContext Context;

string json = "";

public void ProcessRequest(HttpContext context)

{

Context = context;

context.Response.ContentType = "text/plain";

LoadDataToJSON();

context.Response.Write(json);

context.Response.End();

}

string GetQueryString(string name)

{

return Context.Request.Params[name];

}

string View

{

get { return Context.Request.QueryString["View"]; }

}

void LoadDataToJSON()

{

switch (View) //这里么写写sql语句，或者调存储过程

{

case "expstate":

GetNormalData("select id=min(code),text=state from city(nolock) group by state order by min(code)");

break;

case "expcity":

GetNormalData("select id=code,text=city from city(nolock) where left(code,2)='"+

GetQueryString("stateid").Substring(0,2)+

"' and right(code,2)='00' and right(code,4)<>'0000'");

break;

case "expsubcity":

GetNormalData("select id=code,text=city from city(nolock) where left(code,4)='" +

GetQueryString("cityid").Substring(0,4) +"' and right(code,2)<>'00'"); break;

}

}

void GetNormalData(string SQL) //SQL查询，返回json字符串，这个方法是普通的datatable转json

{

SqlConnection Conn = new SqlConnection(ConfigurationManager.ConnectionStrings["Conn"].ToString());

SqlDataAdapter DA = new SqlDataAdapter(SQL, Conn);

Conn.Open();

DataSet DS = new DataSet();

DA.Fill(DS, "c0");

Conn.Close();

string rs = JsonConvert.SerializeObject(DS.Tables["c0"], new DataTableConverter());

json = rs;

}

代码应该贴全了，我还添加了一些注释，如果有疑问，留言吧，有在线测试例子哦，我测试了IE8,FF,chrome，都兼容

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