欢迎讨论？ ，"); strClass.Append("\"Cname\":\"" + dt.Rows[i]["classCname"].ToString() + "\""); if (i != dt.Rows.Count - 1) { strClass.Append("}，"Cname":"A2"}。

赋值这段代码应该放到什么地方呢？或者有什么好的方法， function (data) { for (var i = 0; i data.length; i++) { $("select[name$=ddl1]").append($("option/option").val(data[i].ID).html(data[i].Cname)); }; GetB(); }); } function GetB() { $("#ddl2").html(""); $("#ddl3").html(""); var strId = $("#ddl1").attr("value"); if (strId != 0) { $.getJSON("LoadClass.ashx?ddlId=" + strId，"); } } } strClass.Append("}"); strClass.Append("]"); context.Response.ContentType = "application/json"; context.Response.ContentEncoding = Encoding.UTF8; context.Response.Write(strClass.ToString()); context.Response.End(); } public bool IsReusable { get { return false; } } } 注意： 复制代码 代码如下: //后台只能获取value值， function (data) { for (var i = 0; i data.length; i++) { $("select[name$=ddl2]").append($("option/option").val(data[i].ID).html(data[i].Cname)); }; GetC(); }); } } function GetC() { $("#ddl3").html(""); var strId = $("#ddl2").attr("value"); if (strId != 0) { $.getJSON("LoadClass.ashx?ddlId=" + strId， function (data) { for (var i = 0; i data.length; i++) { $("select[name$=ddl3]").append($("option/option").val(data[i].ID).html(data[i].Cname)); }; }); } } /script LoadClass.ashx: 复制代码 代码如下: %@ WebHandler Language="C#" % using System; using System.Web; using System.Text; using System.Data; public class LoadClass : IHttpHandler { public void ProcessRequest (HttpContext context) { // 数组 [{"ID":"275"，{"ID":"322"， 复制代码 代码如下: asp:DropDownList runat="server" /asp:DropDownList asp:DropDownList runat="server" /asp:DropDownList asp:DropDownList runat="server" /asp:DropDownList js: 复制代码 代码如下: script src="js/jquery-1.4.2.min.js" type="text/javascript" /script script type="text/javascript" $(document).ready(function () { GetA(); $("#ddl1").change(function () { GetB(); }); $("#ddl2").change(function () { GetC(); }); }); function GetA() { $("#ddl1").html(""); $("#ddl1").append("option value='-1' selected='selected'请选择.../option"); //$("select[name$=ddl1] option:selected").remove(); var strId = 0; $.getJSON("LoadClass.ashx?ddlId=" + strId。

需要通过js、控件中转 //结果：275 276 277 Label1.Text = Request.Form[ddl1.UniqueID] + " " + Request.Form["ddl2"] + " " + Request.Form[ddl3.ClientID.Replace("_"，不能直接获取text，"Cname":"A1"}，"Cname":"A3"}] int strId = Convert.ToInt32(context.Request["ddlId"]); string strSQL = "select * from Class where parent_Ptr=" + strId + " order by classOrder asc "; db d = new db(); DataTable dt = d.getDT(strSQL); StringBuilder strClass = new StringBuilder(); if (dt != null) { strClass.Append("["); for (int i = 0; i dt.Rows.Count; i++) { strClass.Append("{"); strClass.Append("\"ID\":\"" + dt.Rows[i]["id"].ToString() + "\"， "$")] ;遇到的问题：下拉框text的值通过HiddenField控件中转 asp:HiddenField runat="server" / asp:HiddenField runat="server" / asp:HiddenField runat="server" / 把选中下拉框的值赋予隐藏控件中： script type="text/javascript" var Key1 = $("#ddl1option:selected").val(); $('#HiddenField1').val(Key1); var Key2 = $("#ddl2option:selected").val(); $('#HiddenField2').val(Key2); var Key3 = $("#ddl3option:selected").val(); $('#HiddenField3').val(Key3); /script 选择下拉框后 动态赋值到HiddenField 控件中的值 无法与下拉框选中的值相对应！ 可能与初始化有关，{"ID":"319"，。