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    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

    阅读 (2185)

    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('<option value="' + json[i].Id + '">' + json[i].Name + '</option>')
      };
      $(sel).prepend('<option value="0">请选择</option>')
     });
    }
    
    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:
    <!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?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?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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