jquery用ajax方式从后台获取json数据后如何将内容填充到下拉列表

对于问题从后台获取json数据，将内容填充到下拉列表，代码非常简单，具体过程请看下面代码。

需求：url:链接     par：ID       sel：下拉列表选择器

//获取下拉列表

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('' + json[i].Name + '')
  };
  $(sel).prepend('请选择')
 });
}

以上代码很简单吧，此问题很easy的解决了。

 Jquery 使用Ajax获取后台返回的Json数据页面处理过程

具体实现过程请看下面代码示例：

 
 
 
  
  
  
 
 
 
 
 
 
 
 

<%@ 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; 
  } 
 } 
} 

 

<%@ 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" %> 
 
 
 
  
  
  
 
 
 
 
 
 
   
   
  
 
   
 
 
 
 
 
 

<%@ 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 list = new List(); 
    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; 
 } 
}

以上就是本文的全部内容，希望大家喜欢。