ajax实现无刷新两级联动DropDownList

ajax实现的无刷新三级联动

http://zhangyu028.cnblogs.com/articles/310568.html

 

本文来自小山blog:
http://singlepine.cnblogs.com/articles/257954.html
里面是三级联动,有数据库文件可下栽.
我只是将三级更改为两级,使用SQL SERVER数据库而已.

我的截图如下:
o_Ajax两级DropDownList联动.JPG
1.首先要在项目中增加对ajax.dll 的引用.

2.AjaxMethod.cs

AjaxMethod.cs
using System;
using System.Data;
using System.Data.SqlClient;
namespace MyAjaxSample
{
    /**//// <summary>
    /// AjaxMethod 的摘要说明。
    /// </summary>
    public class AjaxMethod
    {

        GetPovinceList#region GetPovinceList
        public static DataSet GetPovinceList()
        {
            string sql="select * from povince";
            return GetDataSet(sql);
        }
        #endregion

        GetCityList#region GetCityList
        [Ajax.AjaxMethod]
        public  DataSet GetCityList(int povinceid)
        {
            string sql="select * from city where father='"+povinceid+"'";
            return GetDataSet(sql);            
        }
        #endregion

        GetAreaList#region GetAreaList
        [Ajax.AjaxMethod]
        public  DataSet GetAreaList(int cityid)
        {
            string sql="select * from area where father='"+cityid+"'";
            return GetDataSet(sql);            
        }
        #endregion
    
        GetDataSet#region GetDataSet
        public static DataSet GetDataSet(string sql)
        {
            string ConnectionString=System.Configuration.ConfigurationSettings.AppSettings["ConnectionString"];
            SqlDataAdapter    sda =new SqlDataAdapter(sql,ConnectionString);
            DataSet ds=new DataSet();
            sda.Fill(ds);
            return ds;
        }
        #endregion

        

    }
}


3.HTML代码:

FourAjaxSample.aspx
<%@ Page language="c#" Codebehind="FourAjaxSample.aspx.cs" AutoEventWireup="false" Inherits="MyAjaxSample.FourAjaxSample" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
    <HEAD>
        <title>FourAjaxSample</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">
        <script language="javascript">
        function cityResult() 
        { 
            var city=document.getElementById("DropDownList1");
            AjaxMethod.GetCityList(city.value,get_city_Result_CallBack);
        }
        
        function get_city_Result_CallBack(response)
         {
          if (response.value != null)
             {                    
              document.all("DropDownList2").length=0;　　　　            
　　　　      var ds = response.value;
              if(ds != null && typeof(ds) == "object" && ds.Tables != null)
              {                    
                for(var i=0; i<ds.Tables[0].Rows.length; i++)
　　　　        {
　　　　            var name=ds.Tables[0].Rows[i].city;
　　　　　　        var id=ds.Tables[0].Rows[i].cityID;
　　　　　　        document.all("DropDownList2").options.add(new Option(name,id));
　　　　        }
　　　　           document.all("TextBox1").value="";　　
              }
             }               
         return
       }

    function areaResult() 
    { 
        var area=document.getElementById("DropDownList2");
        AjaxMethod.GetAreaList(area.value,get_area_Result_CallBack);
    }


    function get_area_Result_CallBack()
    {
　　　　var province=document.getElementById("DropDownList1");
        var pindex = province.selectedIndex;
        var pValue = province.options[pindex].value;
        var pText  = province.options[pindex].text;

        var city=document.getElementById("DropDownList2");
        var cindex = city.selectedIndex;
        var cValue = city.options[cindex].value;
        var cText  = city.options[cindex].text;
　　　　document.all("TextBox1").value=pText+cText;　　　　                    
 
    }
        </script>
    </HEAD>
    <body MS_POSITIONING="GridLayout">
        <form id="Form1" method="post" runat="server">
            <h3>Ajax实现两级联动</h3>
            <TABLE class="border" id="border" style="Z-INDEX: 101; LEFT: 16px; WIDTH: 289px; POSITION: absolute; TOP: 48px; HEIGHT: 79px"
                borderColor="#95b0d9" cellSpacing="0" cellPadding="0" width="289" align="center" bgColor="#ffffff"
                border="1">
                <TR>
                    <TD style="WIDTH: 130px; HEIGHT: 27px" bgColor="#d8e7f6">
                        <asp:label id="Lab_province" runat="server">省(直辖市)</asp:label></TD>
                    <TD style="HEIGHT: 27px">
                        <asp:dropdownlist id="DropDownList1" runat="server" onchange="cityResult();"></asp:dropdownlist></TD>
                </TR>
                <TR>
                    <TD style="WIDTH: 130px; HEIGHT: 24px" bgColor="#d8e7f6">
                        <asp:Label id="Lab_City" runat="server">城市</asp:Label></TD>
                    <TD style="HEIGHT: 24px">
                        <asp:DropDownList id="DropDownList2" runat="server" onchange="areaResult();"></asp:DropDownList></TD>
                </TR>
                <TR>
                    <TD style="WIDTH: 130px" bgColor="#d8e7f6">你的最后选择是:
                    </TD>
                    <TD>
                        <asp:TextBox id="TextBox1" runat="server"></asp:TextBox></TD>
                </TR>
            </TABLE>
        </form>
    </body>
</HTML>


4 .cs文件:

FourAjaxSample.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 MyAjaxSample
{
    /**//// <summary>
    /// FourAjaxSample 的摘要说明。
    /// </summary>
    public class FourAjaxSample : System.Web.UI.Page
    {
        protected System.Web.UI.WebControls.DropDownList DropDownList1;
        protected System.Web.UI.WebControls.Label Lab_province;
        protected System.Web.UI.WebControls.Label Lab_City;
        protected System.Web.UI.WebControls.TextBox TextBox1;
        protected System.Web.UI.WebControls.DropDownList DropDownList2;
    
        private void Page_Load(object sender, System.EventArgs e)
        {
            Ajax.Utility.RegisterTypeForAjax(typeof(MyAjaxSample.AjaxMethod));
            if(!Page.IsPostBack)
            {
                this.DropDownList1.DataSource=AjaxMethod.GetPovinceList();
                this.DropDownList1.DataTextField="province";
                this.DropDownList1.DataValueField="provinceID";
                this.DropDownList1.DataBind();
                this.DropDownList1.Attributes.Add("onclick","cityResult();");
                this.DropDownList2.Attributes.Add("onclick","areaResult();");
            }
        }

        Web 窗体设计器生成的代码#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
    }
}


5.web.config

web.config设置数据库连接串
  <appSettings>
        <!-- SQL数据库连接 -->
        <add key="ConnectionString" value="Data Source=localhost;User Id=sa;Password=zhangzs;Initial Catalog=mytest;"/>
  </appSettings>
posted @ 2013-09-17 22:02  kanek  阅读(404)  评论(0)  编辑  收藏  举报