标签：style blog http color os java 使用 io for
前端：
1 <!DOCTYPE html> 2 <html xmlns="http://www.w3.org/1999/xhtml"> 3 <head> 4 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 5 <title></title> 6 <script src="script/jquery-1.7.1.js"></script> 7 <script type="text/javascript"> 8 $(function () { 9 $.getJSON(‘linkage.ashx‘, { pid: 0 }, function (msg) { 10 $.each(msg.items, function (index, item) { 11 $(‘#t1‘).append(‘<option value=‘ + item.TypeId + ‘>‘ + item.TypeTitle + ‘</option>‘); 12 }); 13 }); 14 $(‘#t1‘).change(function () { 15 $.getJSON(‘linkage.ashx‘, { pid: $(‘#t1‘).val() }, function(msg) { 16 $.each(msg.items, function(index, item) { 17 $(‘#t2‘).append(‘<option value=‘ + item.TypeId + ‘>‘ + item.TypeTitle + ‘</option>‘); 18 }); 19 }); 20 }); 21 }); 22 </script> 23 </head> 24 <body> 25 <select id="t1"></select> 26 <select id="t2"></select> 27 </body> 28 </html>
后端代码：
1 using System; 2 using System.Collections.Generic; 3 using System.Data; 4 using System.Data.SqlClient; 5 using System.Linq; 6 using System.Web; 7 using System.Web.Script.Serialization; 8 9 namespace _01二级联动 10 { 11 /// <summary> 12 /// linkage 的摘要说明 13 /// </summary> 14 public class linkage : IHttpHandler 15 { 16 17 public void ProcessRequest(HttpContext context) 18 { 19 context.Response.ContentType = "text/plain"; 20 string connStr = "server=.;database=web1;uid=sa;pwd=sa;"; 21 string pid = context.Request["pid"]; 22 string sql = "select * from typeinfo where typeparentid = " + pid + ""; 23 SqlDataAdapter sda = new SqlDataAdapter(sql, connStr); 24 DataTable dt = new DataTable(); 25 sda.Fill(dt); 26 List<TypeInfo> list = new List<TypeInfo>(); 27 foreach (DataRow row in dt.Rows) 28 { 29 list.Add 30 ( 31 new TypeInfo() 32 { 33 TypeId = Convert.ToInt32(row["TypeId"]), 34 TypeTitle = row["TypeTitle"].ToString(), 35 TypeParentId = Convert.ToInt32(row["TypeParentId"]) 36 } 37 ); 38 } 39 //var item = new 40 //{ 41 // items = list 42 //}; 43 //等价于 new{ items = list} 44 JavaScriptSerializer jsJson = new JavaScriptSerializer(); 45 string res = jsJson.Serialize 46 ( 47 new 48 { 49 items = list 50 } 51 ); 52 context.Response.Write(res); 53 } 54 55 public bool IsReusable 56 { 57 get 58 { 59 return false; 60 } 61 } 62 } 63 }
一个级联的操作
使用jQuery的getJSON方式提交数据（后端处理类是一般处理程序） 一个级联的操作
标签：style blog http color os java 使用 io for
原文地址：http://www.cnblogs.com/bujingkua/p/3938542.html
