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How to fill the content into the drop-down list after jquery obtains json data from the background using ajax_jquery

WBOY
Release： 2016-05-16 15:42:44
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For the problem, get json data from the background and fill the content into the drop-down list. The code is very simple. Please see the code below for the specific process.

Requirements: url: link par: ID sel: drop-down list selector

//Get the drop-down list

function BuildSelectBox(url, par, sel) {
 $(sel).empty();
 $.getJSON(url, { id: par }, function (json, textStatus) {
  for (var i = json.length - 1; i >= 0; i--) {
   $(sel).prepend('<option value="' + json[i].Id + '">' + json[i].Name + '</option>')
  };
  $(sel).prepend('<option value="0">请选择</option>')
 });
}
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The above code is very simple, and this problem can be easily solved.

Jquery uses Ajax to obtain the Json data page processing process returned by the background

Please see the code example below for the specific implementation process: 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head> 
 <title></title> 
 <script src="JS/jquery-1.8.0.min.js" type="text/javascript"></script> 
 <script type="text/javascript"> 
  $(function () { 
   $.ajax({ 
    url: 'jsondata.ashx', 
    type: 'GET', 
    dataType: 'json', 
    timeout: 1000, 
    cache: false, 
    beforeSend: LoadFunction, //加载执行方法 
    error: erryFunction, //错误执行方法 
    success: succFunction //成功执行方法 
   }) 
   function LoadFunction() { 
    $("#list").html('加载中...'); 
   } 
   function erryFunction() { 
    alert("error"); 
   } 
   function succFunction(tt) { 
    $("#list").html(''); 
    //eval将字符串转成对象数组 
    //var json = { "id": "10086", "uname": "zhangsan", "email": "zhangsan@qq.com" }; 
    //json = eval(json); 
    //alert("===json:id=" + json.id + ",uname=" + json.uname + ",email=" + json.email); 
    var json = eval(tt); //数组   
    $.each(json, function (index, item) { 
     //循环获取数据 
     var name = json[index].Name; 
     var idnumber = json[index].IdNumber; 
     var sex = json[index].Sex; 
     $("#list").html($("#list").html() + "<br>" + name + " - " + idnumber + " - " + sex + "<br/>"); 
    }); 
   } 
  }); 
 </script> 
</head> 
<body> 
 <ul id="list"> 
 </ul> 
</body> 
</html> 

<%@ WebHandler Language="C#" Class="jsondata" %> 
using System; 
using System.Web; 
using System.Web.Script.Serialization; 
using System.IO; 
using System.Text; 
using System.Collections.Generic; 
using Newtonsoft.Json; 
using System.Data; 
public class jsondata : IHttpHandler { 
 public void ProcessRequest(HttpContext context) 
 { 
  context.Response.ContentType = "text/plain"; 
  string JsonStr = JsonConvert.SerializeObject(CreateDT()); 
  context.Response.Write(JsonStr); 
  context.Response.End(); 
 } 
 #region 创建测试数据源 
 //创建DataTable 
 protected DataTable CreateDT() 
 { 
  DataTable tblDatas = new DataTable("Datas"); 
  //序号列 
  //tblDatas.Columns.Add("ID", Type.GetType("System.Int32")); 
  //tblDatas.Columns[0].AutoIncrement = true; 
  //tblDatas.Columns[0].AutoIncrementSeed = 1; 
  //tblDatas.Columns[0].AutoIncrementStep = 1; 
  //数据列 
  tblDatas.Columns.Add("IdNumber", Type.GetType("System.String")); 
  tblDatas.Columns.Add("Name", Type.GetType("System.String")); 
  tblDatas.Columns.Add("BirthDate", Type.GetType("System.String")); 
  tblDatas.Columns.Add("Sex", Type.GetType("System.String")); 
  tblDatas.Columns.Add("Wage", Type.GetType("System.Decimal")); 
  tblDatas.Columns.Add("Bonus", Type.GetType("System.Decimal")); 
  //统计列开始 
  tblDatas.Columns.Add("NeedPay", Type.GetType("System.String"), "Wage+Bonus"); 
  //统计列结束 
  tblDatas.Columns.Add("Address", Type.GetType("System.String")); 
  tblDatas.Columns.Add("PostCode", Type.GetType("System.String")); 
  //设置身份证号码为主键 
  tblDatas.PrimaryKey = new DataColumn[] { tblDatas.Columns["IdNumber"] }; 
  tblDatas.Rows.Add(new object[] { "43100000000000", "张三", "1982", "0", 3000, 1000, null, "深圳市", "518000" }); 
  tblDatas.Rows.Add(new object[] { "43100000000001", "李四", "1983", "1", 3500, 1200, null, "深圳市", "518000" }); 
  tblDatas.Rows.Add(new object[] { "43100000000002", "王五", "1984", "1", 4000, 1300, null, "深圳市", "518000" }); 
  tblDatas.Rows.Add(new object[] { "43100000000003", "赵六", "1985", "0", 5000, 1400, null, "深圳市", "518000" }); 
  tblDatas.Rows.Add(new object[] { "43100000000004", "牛七", "1986", "1", 6000, 1500, null, "深圳市", "518000" }); 
  return tblDatas; 
 } 
 #endregion 
 public bool IsReusable 
 { 
  get 
  { 
   return false; 
  } 
 } 
} 

<!-- 
  <script type="text/javascript"> 
  $(function () { 
   $.ajax({ 
    url: 'jsondata.ashx', 
    type: 'GET', 
    dataType: 'json', 
    timeout: 1000, 
    cache: false, 
    beforeSend: LoadFunction, //加载执行方法 
    error: erryFunction, //错误执行方法 
    success: succFunction //成功执行方法 
   }) 
   function LoadFunction() { 
    $("#list").html('加载中...'); 
   } 
   function erryFunction() { 
    alert("error"); 
   } 
   function succFunction(tt) { 
    $("#list").html(''); 
    //eval将字符串转成对象数组 
    //var json = { "id": "10086", "uname": "zhangsan", "email": "zhangsan@qq.com" }; 
    //json = eval(json); 
    //alert("===json:id=" + json.id + ",uname=" + json.uname + ",email=" + json.email); 
    var json = eval(tt); //数组   
    $.each(json, function (index, item) { 
     //循环获取数据 
     var Key = json[index].key; 
     var Info = json[index].info; 
     //     var idnumber = json[index].IdNumber; 
     //     var sex = json[index].Sex; 
     $("#list").html($("#list").html() + "<br>" + Key + "----" + Info.name); //+ " - " + idnumber + " - " + sex + "<br/>"); 
    }); 
   } 
  }); 
 </script> 
--> 

<%@ WebHandler Language="C#" Class="jsondata" %> 
using System; 
using System.Web; 
using System.Web.Script.Serialization; 
using System.IO; 
using System.Text; 
using System.Collections; 
using System.Collections.Generic; 
using System.Data; 
public class jsondata : IHttpHandler { 
 public void ProcessRequest(HttpContext context) 
 { 
  context.Response.ContentType = "text/plain"; 
  context.Response.Cache.SetNoStore(); 
  string data = "[{\"key\":\"1\",\"info\":{\"name\":\"222\",\"age\":\"333\",\"sex\":\"444\"}},{\"key\":\"2\",\"info\":{\"name\":\"999\",\"age\":\"000\",\"sex\":\"111\"}}]"; 
  context.Response.Write(new JavaScriptSerializer().Serialize(data)); 
 } 
 public bool IsReusable 
 { 
  get 
  { 
   return false; 
  } 
 } 
} 

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Test2013.aspx.cs" Inherits="Test2013" %> 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head runat="server"> 
 <title></title> 
 <script src="JS/jquery-1.8.0.min.js" type="text/javascript"></script> 
 <script type="text/javascript"> 
  function GetPara(o) { 
   var sortid = $(o).val(); 
   $.ajax({ 
    url: 'GetPara.ashx&#63;type=get&sortid=' + sortid, 
    type: 'GET', 
    dataType: 'json', 
    timeout: 3000, 
    cache: false, 
    beforeSend: LoadFunction, //加载执行方法  
    error: erryFunction, //错误执行方法  
    success: succFunction //成功执行方法  
   }) 
   function LoadFunction() { 
    $("#list").html('加载中...'); 
   } 
   function erryFunction() { 
    alert("error"); 
   } 
   function succFunction(tt) { 
    $("#list").html(''); 
    var json = eval(tt); //数组 
    $.each(json, function (index, item) { 
     //循环获取数据  
     var Id = json[index].id; 
     var Name = json[index].name; 
     $("#list").html($("#list").html() + "<br>" + Name + "<input type='text' id='" + Id + "' /><br/>"); 
    }); 
   } 
  }; 
  function SavePara() { 
   var parameter = {}; 
   $("#list input:text").each(function () { 
    var key = $(this).attr("id"); 
    var value = $(this).val(); 
    parameter[key] = value; 
   }); 
   $.ajax({ 
    url: 'GetPara.ashx&#63;type=save', 
    type: 'POST', 
    dataType: 'json', 
    data: parameter, 
    timeout: 3000, 
    cache: false, 
    beforeSend: LoadFunction, //加载执行方法  
    error: erryFunction, //错误执行方法  
    success: succFunction //成功执行方法  
   }) 
   function LoadFunction() { 
   } 
   function erryFunction() { 
   } 
   function succFunction(tt) { 
   } 
  }; 
 </script> 
</head> 
<body> 
 <form id="form1" runat="server"> 
 <div> 
  <asp:DropDownList ID="ddl1" runat="server" onchange="GetPara(this)"> 
  </asp:DropDownList> 
  <ul id="list"></ul> 
  <input type="button" value="保存数据" onclick="SavePara()" /> 
 </div> 
 </form> 
</body> 
</html> 

<%@ WebHandler Language="C#" Class="GetPara" %> 
using System; 
using System.Web; 
using System.Data; 
using System.Collections.Generic; 
using System.Web.Script.Serialization; 
public class GetPara : IHttpHandler {  
 public void ProcessRequest (HttpContext context) { 
  context.Response.ContentType = "text/plain"; 
  string SortId = context.Request["sortid"]; 
  string Type = context.Request["type"]; 
  if (Type=="get") 
  { 
   if (!string.IsNullOrEmpty(SortId)) 
   { 
    DataTable dt = MSCL.SqlHelper.GetDataTable("select * from PR_PRODUCTPARAS where sortid='" + SortId + "' "); 
    List<Paras> list = new List<Paras>(); 
    for (int i = 0; i < dt.Rows.Count; i++) 
    { 
     Paras a = new Paras(); 
     a.id = dt.Rows[i]["PARAID"].ToString(); 
     a.name = dt.Rows[i]["PARANAME"].ToString(); 
     list.Add(a); 
    } 
    context.Response.Write(new JavaScriptSerializer().Serialize(list)); 
   } 
  } 
  else if (Type == "save") 
  { 
   //反序列化json 
   System.IO.Stream stream = context.Request.InputStream; 
   System.IO.StreamReader sr = new System.IO.StreamReader(stream, System.Text.Encoding.GetEncoding("UTF-8")); 
   string sJson = sr.ReadToEnd(); 
   if (sJson.Contains("&")) 
   { 
    string[] sArr = sJson.Split('&'); 
    for (int i = 0; i < sArr.Length; i++) 
    { 
     string[] sArr1 = sArr[i].Split('='); 
     object id = sArr1[0]; 
     object value = sArr1[1]; 
    } 
   } 
  } 
  else 
  { } 
 } 
 public bool IsReusable { 
  get { 
   return false; 
  } 
 } 
 public struct Paras 
 { 
  public string id; 
  public string name; 
 } 
}
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Related labels：
jquery_ajax获取json数据 jquery_ajax返回json jquery_ajax_json实例
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