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ASP.NET利用JavaScript实现无刷新闪烁二级联动菜单

Posted on 2005-01-17 09:29  Hover  阅读(12684)  评论(17编辑  收藏  举报

转载请注明出处--翱翔.Net Blog Http://cnblogs.com/Hover

News_Aclass表---大类表
ClassID Int 4
ClassName varchar 50

News_Anclass表---小类表
NclassID int 4
Nclass varchar 50
ClassID int 4

---------------------------------aspx------------------------------

<%@ Page language="c#" Codebehind="test.aspx.cs" AutoEventWireup="false" Inherits="HoverPortal.Modules.NewsManager.test" enableViewState="False"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
    
<HEAD>
        
<title>test</title>
        
<meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1">
        
<meta name="CODE_LANGUAGE" Content="C#">
        
<meta name="vs_defaultClientScript" content="JavaScript">
        
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
    
</HEAD>
    
<body>
        
<form id="Form1" method="post" runat="server">
            
<asp:DropDownList id="ClassID" runat="server" onChange="changelocation(document.Form1.ClassID.options[document.Form1.ClassID.selectedIndex].value)"></asp:DropDownList>
            
<asp:DropDownList id="NclassID" runat="server"></asp:DropDownList>
            
<asp:Button id="Button1" runat="server" Text="Button"></asp:Button>
        
</form>
    
</body>
</HTML>
-----------------------------------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;
using System.Data.SqlClient;
using Microsoft.ApplicationBlocks.Data;

namespace HoverPortal.Modules.NewsManager
{
    
/// <summary>
    
/// test 的摘要说明。
    
/// </summary>

    public class test : System.Web.UI.Page
    
{
        
protected System.Web.UI.WebControls.DropDownList NclassID;
        
protected System.Web.UI.WebControls.Button Button1;
        
protected System.Web.UI.WebControls.DropDownList ClassID;
    
        
private void Page_Load(object sender, System.EventArgs e)
        
{
            
// 在此处放置用户代码以初始化页面
            ReWriteScript();
            
//if(!Page.IsPostBack )
            DataBinds();
        }

        
private void ReWriteScript()
        
{
            
int count=0;
            
string scriptString="<Script Language=JavaScript>\n var onecount;";
            scriptString 
+="\nonecount=0;";
            scriptString 
+="\nsubcat=new Array();";
            SqlDataReader rs
=this.GetNclass();
            
while(rs.Read())
            
{
                scriptString 
+="\n subcat["+count+"]=new Array("+"'"+rs["Nclass"]+"'"+","+"'"+rs["classID"]+"'"+","+"'"+rs["NclassID"]+"'"+");";
                count
++;
            }

            rs.Close();
            scriptString 
+="\n onecount="+count+";";
            scriptString 
+="\n function changelocation(locationid){";
            scriptString 
+="\n document.Form1.NclassID.length = 0;";
            scriptString 
+="\n var locationid=locationid;";
            scriptString 
+="\n var i;";
            scriptString 
+="\n for(i=0; i<onecount; i++){";
            scriptString 
+="\n if(subcat[i][1]==locationid){";
            scriptString 
+="\n document.Form1.NclassID.options[document.Form1.NclassID.length]=new Option(subcat[i][0],subcat[i][2]);";
            scriptString 
+="\n }";
            scriptString 
+="\n }";
            scriptString 
+="\n }";
            scriptString 
+="<";
            scriptString 
+="/";
            scriptString 
+="script>";
            
if(!this.IsClientScriptBlockRegistered("clientScript"))            
            
{
                
this.RegisterClientScriptBlock("clientScript",scriptString);
            }

        }


        
private SqlDataReader GetNclass()
        
{
            SqlDataReader NclassReader
=SqlHelper.ExecuteReader(SqlDbObject.Connection,CommandType.StoredProcedure,"sp_News_GetNClass");
            
return NclassReader;
        }

        
private DataSet Getclass()
        
{
            DataSet Classds
=SqlHelper.ExecuteDataset(SqlDbObject.Connection,CommandType.StoredProcedure,"sp_News_GetClass");
            
return Classds;
        }

        
private DataSet Getnclass()
        
{
            DataSet Classds
=SqlHelper.ExecuteDataset(SqlDbObject.Connection,CommandType.StoredProcedure,"sp_News_GetNClass");
            
return Classds;
        }

private DataSet Getnclass(int classid)
  {
   SqlParameter[] parameter={new SqlParameter("@ClassID",SqlDbType.Int,4)};
   parameter[0].Value=classid;
   using(DataSet ds=SqlHelper.ExecuteDataset(SqlDbObject.Connection,CommandType.StoredProcedure,"Sp_News_GetNclassBYclassID",parameter))
   {
    return ds;
   }
  }

        
private void DataBinds()
        
{
            DataTable dt
=this.Getclass().Tables[0];  //获得大类列表

            
this.ClassID.DataSource=dt;
            
this.ClassID.DataTextField="ClassName";
            
this.ClassID.DataValueField="ClassID";
            
this.ClassID.DataBind();
            DataTable dtn=Getnclass(int.Parse(this.ClassID.SelectedValue)).Tables[0]; //根据大类列表默认选中项读出所属的小类列表
            
this.NclassID.DataSource=dtn;
            
this.NclassID.DataTextField="Nclass";
            
this.NclassID.DataValueField="NclassID";
            
this.NclassID.DataBind();
            
        }

        
Web 窗体设计器生成的代码

        
private void Button1_Click(object sender, System.EventArgs e)
        
{
            Response.Write(Request.Params[
1]);
            Response.Write(
"</br>");
            Response.Write(Request.Params[
2]);
        }

    }

}

只是把写asp用的移值到asp.net中来!.