Ajax实现无刷新三联动下拉框

来源：互联网发布：唯品会有类似淘宝客编辑：程序博客网时间：2024/05/16 17:27

1.html代码
<HTML>
    <HEAD>
        <title>Ajax实现无刷新三联动下拉框</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">
            //城市------------------------------
            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)
                {
                    //debugger;
                    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));
　　　　                }
                    }
                }
                return
            }
            //市区----------------------------------------
            function areaResult()
            {
                var area=document.getElementById("DropDownList2");
                AjaxMethod.GetAreaList(area.value,get_area_Result_CallBack);
            }
            function get_area_Result_CallBack(response)
            {
                if (response.value != null)
                {
                    document.all("DropDownList3").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].area;
　　　　　　                var id=ds.Tables[0].Rows[i].areaID;
　　　　　　                document.all("DropDownList3").options.add(new Option(name,id));
　　　　                }
                    }
                }
                return
            }
            function getData()
            {
                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;

                var area=document.getElementById("DropDownList3");
                var aindex = area.selectedIndex;
                var aValue = area.options[aindex].value;
                var aText = area.options[aindex].text;

                var txt=document.getElementById("TextBox1");

                document.getElementById("<%=TextBox1.ClientID%>").innerText="省:"+pValue+"|"+pText+"市:"+cValue+"|"+cText+"区:"+aValue+"|"+aText;
            }
        </SCRIPT>
    </HEAD>
    <body ms_positioning="GridLayout">
        <form id="Form1" method="post" runat="server">
            <TABLE id="Table1" style="Z-INDEX: 101; LEFT: 96px; POSITION: absolute; TOP: 32px" cellSpacing="1"
                cellPadding="1" width="300" border="1" bgColor="#ccff66">
                <TR>
                    <TD>省市</TD>
                    <TD><asp:dropdownlist id="DropDownList1" runat="server"></asp:dropdownlist></TD>
                </TR>
                <TR>
                    <TD>城市</TD>
                    <TD><asp:dropdownlist id="DropDownList2" runat="server"></asp:dropdownlist></TD>
                </TR>
                <TR>
                    <TD>市区</TD>
                    <TD><asp:dropdownlist id="DropDownList3" runat="server"></asp:dropdownlist></TD>
                </TR>
            </TABLE>
            <asp:TextBox id="TextBox1" style="Z-INDEX: 102; LEFT: 416px; POSITION: absolute; TOP: 48px" runat="server"
                Width="424px"></asp:TextBox><INPUT style="Z-INDEX: 103; LEFT: 456px; WIDTH: 56px; POSITION: absolute; TOP: 96px; HEIGHT: 24px"
                type="button" value="test" onclick="getData();">
        </form>
    </body>
</HTML>

2.cs代码
public class WebForm1 : System.Web.UI.Page
    {
        protected System.Web.UI.WebControls.DropDownList DropDownList1;
        protected System.Web.UI.WebControls.DropDownList DropDownList2;
        protected System.Web.UI.WebControls.TextBox TextBox1;
        protected System.Web.UI.WebControls.DropDownList DropDownList3;

        private void Page_Load(object sender, System.EventArgs e)
        {
            Ajax.Utility.RegisterTypeForAjax(typeof(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 Form Designer generated code#region Web Form Designer generated code
        override protected void OnInit(EventArgs e)
        {
            //
            // CODEGEN: This call is required by the ASP.NET Web Form Designer.
            //
            InitializeComponent();
            base.OnInit(e);
        }

        /**//// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.Load += new System.EventHandler(this.Page_Load);

        }
        #endregion
    }3.AjaxMethod
using System;
using System.Data;
using System.Data.SqlClient;
namespace AjaxTest
{
    /**//// <summary>
    /// Summary description for AjaxMethod.
    /// </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(Ajax.HttpSessionStateRequirement.Read)]
        public DataSet GetCityList(int povinceid)
        {
            string sql="select * from city where father='"+povinceid+"'";
            return GetDataSet(sql);
        }
        #endregion

        GetAreaList#region GetAreaList
        [Ajax.AjaxMethod(Ajax.HttpSessionStateRequirement.Read)]
        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
    }
}4.web.config
<httpHandlers>
            <add verb="POST,GET" path="ajax/*.ashx" type="Ajax.PageHandlerFactory, Ajax" />
    </httpHandlers>