AJAX控件之CascadingDropDow
前台代码：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" EnableEventValidation="false"%><%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head runat="server"> <title>CascadingDropDown控件使用</title> <style type="text/css"> .style1
{
width: 400px;
} .style2 { width: 228px; } </style></head><body> <form id="form1" runat="server"> <asp:ScriptManager ID="ScriptManager1" runat="server" /> <div style="text-align: center"> <table class="style1" border="1"> <tr> <td> 省份：</td> <td align="left" class="style2"> <asp:DropDownList ID="DropDownList1" runat="server" Width="190px" Height="24px"> </asp:DropDownList> </td> </tr> <tr> <td> 县：</td> <td align="left" class="style2"> <asp:DropDownList ID="DropDownList2" runat="server" Width="188px" Height="20px"> </asp:DropDownList> </td> </tr> <tr> <td> 市：</td> <td align="left" class="style2"> <asp:DropDownList ID="DropDownList3" runat="server" Height="22px" Width="185px" AutoPostBack="True" onselectedindexchanged="DropDownList3_SelectedIndexChanged"> </asp:DropDownList> </td> </tr> </table> <cc1:CascadingDropDown ID="CascadingDropDown1" runat="server" Category="province" PromptText="请选择省" ServiceMethod="GetDropDownContents" ServicePath="WebService.asmx" TargetControlID="DropDownList1"> </cc1:CascadingDropDown> <cc1:CascadingDropDown ID="CascadingDropDown2" runat="server" Category="city" ParentControlID="DropDownList1" PromptText="请选择市" ServiceMethod="GetDropDownContents" TargetControlID="DropDownList2" ServicePath="WebService.asmx"> </cc1:CascadingDropDown> <cc1:CascadingDropDown ID="CascadingDropDown3" runat="server" Category="county" ParentControlID="DropDownList2" PromptText="请选择县" ServiceMethod="GetDropDownContents" TargetControlID="DropDownList3" ServicePath="WebService.asmx"> </cc1:CascadingDropDown> <asp:UpdatePanel ID="UpdatePanel1" runat="server"> <ContentTemplate> <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label> </ContentTemplate> <Triggers> <asp:AsyncPostBackTrigger ControlID="DropDownList3" EventName="SelectedIndexChanged" /> </Triggers> </asp:UpdatePanel> </div> </form></body></html>using System;using System.Data;using System.Configuration;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 _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e)
{
} protected void DropDownList3_SelectedIndexChanged(object sender, EventArgs e) { if (DropDownList3.SelectedItem.Text == "") { Label1.Text = "你还没有选择！"; } else { Label1.Text="你的籍贯是"+DropDownList1.SelectedItem.Text+DropDownList2.SelectedItem.Text+DropDownList3.SelectedItem.Text; } }}<?xml version="1.0" encoding="utf-8" ?><WebServer> <province name="河南省"> <city name="南阳市"> <county name="宛城区"> </county> <county name="卧龙区"> </county> <county name="高新区"> </county> </city> <city name="郑州市"> <county name="武侯区"> </county> <county name="青阳区"> </county> <county name="海安区"> </county> </city> </province> <province name="广东省"> <city name="潮州市"> <county name="潮安县"> </county> </city> <city name="河源市"> <county name="东源县"> </county> <county name="和平县"> </county> </city> </province> <province name="江苏省"> <city name="盐城市"> <county name="建湖县"> </county> <county name="盐城县"> </county> </city> <city name="南通市"> <county name="海安县"> </county> <county name="如东县"> </county> </city> <city name="扬州市"> <county name="宝应县"> </county> </city> </province></WebServer>websevrer页代码：
using System;using System.Web;using System.Collections.Specialized;using System.Web.Services;using System.Web.Services.Protocols;using System.Xml;/// <summary>/// WebService 的摘要说明/// </summary>[WebService(Namespace = "http://tempuri.org/")][WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)][System.Web.Script.Services.ScriptService]public class WebService : System.Web.Services.WebService{ public WebService() { } private static XmlDocument xmlDoc; private static object objectLock = new object(); public static XmlDocument Document { get { lock (objectLock) { if (xmlDoc == null) { xmlDoc = new XmlDocument(); xmlDoc.Load(HttpContext.Current.Server.MapPath("~/App_Data/XML.xml")); } } return xmlDoc; } } public static string[] Hierarchy { get { return new string[] { "province", "city" }; } } [WebMethod] public AjaxControlToolkit.CascadingDropDownNameValue[] GetDropDownContents(string knownCategoryValues, string category) { StringDictionary knownCategoryValuesDictionary = AjaxControlToolkit.CascadingDropDown.ParseKnownCategoryValuesString(knownCategoryValues); return AjaxControlToolkit.CascadingDropDown.QuerySimpleCascadingDropDownDocument(Document, Hierarchy, knownCategoryValuesDictionary, category); }}
