.NET中实现无刷新客户端联动下拉菜单 (无刷新)

    技术2022-05-11  16

    <%@ 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]));        }      }   } 

    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"] + ",";

       }

      }

      #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

       }}

     

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