用DropDownList控件綁定XML數據實現省市區三級聯動

 

用DropDownList控件綁定XML數據實現省市區三級聯動(需要用到VS2005的Datasource和AJAX1.0),此方法僅用於學習討論..

Citys.xml文件格式:

 

<?xml version="1.0" encoding="utf-8"?>
<PCitys>
  <Province pname="安徽省">
    <City cname="蚌埠市">
      <County name="蚌埠市"/>
      <County name="固鎮縣"/>
      <County name="懷遠縣"/>
      <County name="五河縣"/>
    </City>
    <City cname="巢湖市">
      <County name="巢湖市"/>
      <County name="含山縣"/>
      <County name="和縣"/>
      <County name="廬江縣"/>
      <County name="無爲縣"/>
    </City>
    <City cname="池州市">
      <County name="池州市"/>
      <County name="東至縣"/>
      <County name="青陽縣"/>
      <County name="石臺縣"/>
    </City>
  </Province>
</PCitys> 

前臺顯示代碼(VS2005的AJAX1.0實現無刷新調數據):

 

<asp:ScriptManager id="ScriptManager1" runat="server"></asp:ScriptManager>
<asp:UpdatePanel ID="upPCC" runat="server">
                <ContentTemplate>
<asp:DropDownList ID="ddlProvince" runat="server" AppendDataBoundItems="True" AutoPostBack="True"
            DataSourceID="XmlDataSource1" DataTextField="pname" DataValueField="pname" OnSelectedIndexChanged="ddlProvince_SelectedIndexChanged">
            <asp:ListItem Selected="True">省份</asp:ListItem>
        </asp:DropDownList><asp:XmlDataSource ID="XmlDataSource1" runat="server" DataFile="~/App_Data/Citys.xml"
            XPath="//Province"></asp:XmlDataSource>
        &nbsp;
        <asp:DropDownList ID="ddlCity" runat="server" AppendDataBoundItems="True" AutoPostBack="True"
            DataSourceID="XmlDataSource2" DataTextField="cname" DataValueField="cname" OnSelectedIndexChanged="ddlCity_SelectedIndexChanged">
            <asp:ListItem Selected="True">區市</asp:ListItem>
        </asp:DropDownList><asp:XmlDataSource ID="XmlDataSource2" runat="server" DataFile="~/App_Data/Citys.xml"
            XPath="//Province[@pname='']/City"></asp:XmlDataSource>
        <asp:DropDownList ID="ddlCounty" runat="server" AppendDataBoundItems="True" DataSourceID="XmlDataSource3"
            DataTextField="name" DataValueField="name">
            <asp:ListItem Selected="True">縣市</asp:ListItem>
        </asp:DropDownList><asp:XmlDataSource ID="XmlDataSource3" runat="server" DataFile="~/App_Data/Citys.xml"
            XPath="//Province[@pname='']/City[@cname='']/County"></asp:XmlDataSource>
</ContentTemplate></asp:UpdatePanel>

 

後臺代碼:

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class EmployeeAdd : System.Web.UI.Page
...{
    protected void Page_Load(object sender, EventArgs e)
    ...{
    }
    protected void ddlProvince_SelectedIndexChanged(object sender, EventArgs e)
    ...{
        ddlCity.Items.Clear();
        ddlCity.Items.Add("地市");
        ddlCity.DataTextField = "cname";
        ddlCity.DataValueField = "cname";
        XmlDataSource2.XPath = "//Province[@pname='" + ddlProvince.SelectedValue + "']/City";
        ddlCounty.Items.Clear();
        ddlCounty.Items.Add("縣市");
    }
    protected void ddlCity_SelectedIndexChanged(object sender, EventArgs e)
    ...{
        ddlCounty.Items.Clear();
        ddlCounty.Items.Add("縣市");
        ddlCounty.DataTextField = "name";
        ddlCounty.DataValueField = "name";
        XmlDataSource3.XPath = "//Province[@pname='" + ddlProvince.SelectedValue + "']/City[@cname='" + ddlCity.SelectedValue + "']/County";
    }
}

ASP.NET2.0真是好,用DataSource控件簡單解決了,不用寫代碼了.^_^