ddl2.DataSource = getDs(sql);
ddl2.DataTextField = "cname";
ddl2.DataValueField = "id";
ddl2.DataBind();
//第三个
if (ddl2.DataSource != null) ddl2.Attributes.Add("onchange", "showNext(this.options[selectedIndex].value,''ddl3'');");
sql = @"select * from webclass where parentid=" + ddl2.SelectedItem.Value;
ddl3.DataSource = getDs(sql);
ddl3.DataTextField = "cname";
ddl3.DataValueField = "id";
ddl3.DataBind();
}
}
default.aspx内容：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!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">
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>AjaxPro实现无刷新三级联动</title>
</head>
<script language="javascript" type="text/javascript">
<!--
// ACLOUD 常用JS函数
function getBid(s){
return document.getElementById(s);
}
function getBmc(s){
return document.getElementByName(s);
}
//显示分类列表
function showNext(sid,obj)
{
if(sid==null || sid=="" || sid.length<1)return;
var slt =getBid(obj);
var v = _Default.getNextClass(sid).value; // 类的名称
//alert(v);
//return;
if (v != null){
if(v != null && typeof(v) == "object" && v.Tables != null)