.NET中实现无刷新客户端联动下拉菜单 (无刷新) (通过下拉菜单动态显示不同图片也可也该方法实现)<%@ Page language="c#" Codebehind="WebForm1.aspx.cs" AutoEventWireup="false" Inherits="CustomManager.company.WebForm1" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" ><HTML> <HEAD> <title>WebForm1</title> <meta content="Microsoft Visual Studio .NET 7.1" name="GENERATOR"> <meta content="C#" name="CODE_LANGUAGE"> <meta content="JavaScript" name="vs_defaultClientScript"> <meta content="http://schemas.microsoft.com/intellisense/ie5" name="vs_targetSchema"> <LINK href="../css/style.css" type="text/css" rel="stylesheet"> </HEAD> <body MS_POSITIONING="GridLayout"> <form id="Form1" method="post" runat="server"> <asp:dropdownlist id="DropDownList1" style="Z-INDEX: 101; LEFT: 40px; POSITION: absolute; TOP: 168px" runat="server"></asp:dropdownlist><!--以下的label中隐藏存放一级栏目和二级栏目对应的内容--><asp:label id="Label1" style="display:none;" runat="server">Label</asp:label> <asp:DropDownList id="DropDownList2" style="Z-INDEX: 104; LEFT: 40px; POSITION: absolute; TOP: 264px" runat="server"></asp:DropDownList></form><script LANGUAGE="javascript">//将隐藏的字符串取出来，然后分割到一个数组中去var str = document.getElementById("Label1").innerText;arr=str.split(",");a=arr.lengthar=new Array()
for (i=0;i<a;i++){
ar[i]=arr[i].split("-");
}onecount=ar.length;//此处实现联动function ld() { document.Form1.DropDownList2.length=0 lid=Form1.DropDownList1.value; 
for (i=0;i<onecount;i++) { if (ar[i][0] == lid) { document.Form1.DropDownList2.options.add(new Option(ar[i][2], ar[i][1])); 
} } } /*换图片的方法function changeimg(){ document.Form1.faceimage.src="images/face/"+document.Form1.userface.value;}*/function showMsg(){ alert(document.Form1.DropDownList1.value); alert(document.Form1.DropDownList2.value);} </script> </body></HTML>以下是WebForm1.aspx.csusing System;using System.Collections;using System.ComponentModel;using System.Data;using System.Drawing;using System.Web;using System.Web.SessionState;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.HtmlControls;namespace CustomManager.company{ /// <summary> /// WebForm1 的摘要说明。 /// </summary> public class WebForm1 : System.Web.UI.Page { protected System.Web.UI.WebControls.DropDownList DropDownList1; protected System.Web.UI.WebControls.Label Label1; protected System.Web.UI.WebControls.DropDownList DropDownList2; static protected DataTable tb1; private void Page_Load(object sender, System.EventArgs e) { // 在此处放置用户代码以初始化页面 if(!Page.IsPostBack) { }//给DropDownList1设置onchange事件 DropDownList1.Attributes.Add("onchange","ld();"); string strConn,strSql; System.Data.SqlClient.SqlDataAdapter da; //从数据库中取出一级栏目，绑定到 DropDownList1strConn = "server=localhost;database=custom;uid=custom;pwd=a;"; strSql = "select * from custom.bigcalling;"; da = new System.Data.SqlClient.SqlDataAdapter(strSql,strConn); DataTable tb3 = new DataTable(); da.Fill(tb3); DropDownList1.DataSource = tb3; DropDownList1.DataTextField = "BIGCALLNAME"; DropDownList1.DataValueField= "BIGCALLID"; DropDownList1.DataBind();//取出二级栏目数据，存放到一个DataTable()中 strSql = "select * from custom.smallcalling;"; da = new System.Data.SqlClient.SqlDataAdapter(strSql,strConn); tb1 = new DataTable(); da.Fill(tb1);//以下就是将一级和二级菜单的内容，分别以"-"和","隔开//然后存放到 Label1中,这样客户端就可以通过脚本取得所需要的数据了 Label1.Text = ""; foreach(DataRow row in tb1.Rows) { Label1.Text = Label1.Text + row["BIGCALLID"] + "-" +row["SMALLCALLID"] + "-"+row["SMALLCALLNAME"] + ","; } }
Web 窗体设计器生成的代码 }}
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