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开发学院WEB开发ASP.NET .NET中实现无刷新客户端联动下拉菜单 (无刷新) (转... 阅读

.NET中实现无刷新客户端联动下拉菜单 (无刷新) (转帖)

 2009-11-03 16:50:46 来源:WEB开发网   
核心提示:<%@ Page language="c#" Codebehind="WebForm1.aspx.cs" AutoEventWireup="false" Inherits="CustomManager.company.WebForm1"
<%@ 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.length
ar=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]));  
  }  
 }  
} 

function showMsg()
{
alert(document.Form1.DropDownList1.value);
alert(document.Form1.DropDownList2.value);
}

 </script>
</body>
</HTML>

以下是WebForm1.aspx.cs

using 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   DropDownList1
strConn = "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"] + ",";

  }

 }

 #region Web 窗体设计器生成的代码
 override protected void OnInit(EventArgs e)
 {
  //
  // CODEGEN: 该调用是 asp.net Web 窗体设计器所必需的。
  //
  InitializeComponent();
  base.OnInit(e);
 }
 
 /// <summary>
 /// 设计器支持所需的方法 - 不要使用代码编辑器修改
 /// 此方法的内容。
 /// </summary>
 private void InitializeComponent()
 {  
  this.Load += new System.EventHandler(this.Page_Load);

 }
 #endregion

 
}
}

Tags:NET 实现 刷新

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