jquery+xml+ajax 省市多级联动
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choice.js $(document).ready(function () { if ($("._province").val() == "0") { $("._city").append("<option value=\"0\">请选择：</option>"); $("._district").append("<option value=\"0\">请选择：</option>"); } else { var val = $("._province").val(); htmlobjc = $.ajax({ url: "Ashx/City.ashx?id=" + val, async: false }); var responsec = htmlobjc.responseText; $("._city").append(responsec); var pid = val; $choiceText = $(".v_city").attr("value"); val = $("._city").val($choiceText).val(); htmlobj = $.ajax({ url: "Ashx/District.ashx?id=" + val + "&pid=" + pid, async: false }); var response = htmlobj.responseText; $("._district").append(response); $("._district").val($(".v_district").attr("value")); } $("._province").change(function () { var val = $(this).val(); $("._city").empty(); $("._district").empty(); if (val != "0") { htmlobj = $.ajax({ url: "Ashx/City.ashx?id=" + val, async: false }); var response = htmlobj.responseText; $("._city").append(response); } else { $("._city").append("<option value=\"0\">请选择：</option>"); } $("._district").append("<option value=\"0\">请选择：</option>"); }); $("._city").change(function () { var val = $(this).val(); var pid = $("._province").val(); if (val != "0") { $("._district").empty(); htmlobj = $.ajax({ url: "Ashx/District.ashx?id=" + val + "&pid=" + pid, async: false }); var response = htmlobj.responseText; $("._district").append(response); } }); $(".uBtn").click(function () { $(".v_city").attr("value", ""); $(".v_district").attr("value", ""); $(".v_city").attr("value", $("._city").find("option:selected").text()); $(".v_district").attr("value", $("._district").find("option:selected").text()); }) });Area.xml<?xml version="1.0" encoding="utf-8" ?><Area> <Province id="1" name="河南省"> <City id="1" name="郑州市"> <District id="1" name="金水区"></District> <District id="2" name="二七区"></District> </City> <City id="2" name="安阳市"> <District id="1" name="开发区"></District> <District id="2" name="龙安区"></District> </City> </Province> <Province id="2" name="河北省"> <City id="1" name="石家庄市"> <District id="1" name="11区"></District> <District id="2" name="22区"></District> </City> <City id="2" name="邯郸市"> <District id="1" name="33区"></District> <District id="2" name="44区"></District> </City> </Province></Area>
city.ashx<%@ WebHandler Language="C#" Class="City" %>using System;using System.Web;using System.Xml.Linq;using System.Linq;using System.Text;public class City : IHttpHandler { public void ProcessRequest (HttpContext context) { try { context.Response.ContentType = "text/plain"; string type = "City", id = string.Empty; id = context.Request.QueryString["id"]; context.Response.Write(CityDrpDataBound(type, id)); } catch { } } private string CityDrpDataBound(string type,string id) { StringBuilder str = new StringBuilder(); str.Append("<option value=\"0\">请选择：</option>\n"); string path = HttpContext.Current.Server.MapPath("~/xml/area/area.xml"); XElement xElement = XElement.Load(path); var query = (from obj in xElement.Elements("Province") where obj.Attribute("id").Value==id select obj).Single(); var items = (from obj in query.Elements(type) select new { id = obj.Attribute("id").Value, name = obj.Attribute("name").Value, }).ToList(); foreach (var item in items) { str.Append("<option value=\"" + item.id + "\">" + item.name + "</option>\n"); } return str.ToString(); } public bool IsReusable { get { return false; } }}district.ashx<%@ WebHandler Language="C#" Class="District" %>using System;using System.Web;using System.Xml.Linq;using System.Linq;using System.Text;public class District : IHttpHandler{ public void ProcessRequest (HttpContext context) { try { context.Response.ContentType = "text/plain"; string type = "District", id = string.Empty, pid = string.Empty; id = context.Request.QueryString["id"]; pid = context.Request.QueryString["pid"]; context.Response.Write(CityDrpDataBound(type, id, pid)); } catch { } } private string CityDrpDataBound(string type,string id,string pid) { StringBuilder str = new StringBuilder(); str.Append("<option value=\"0\">请选择：</option>\n"); string path = HttpContext.Current.Server.MapPath("~/xml/area/area.xml"); XElement xElement = XElement.Load(path); var query = (from obj in xElement.Elements("Province") where obj.Attribute("id").Value==pid select obj).Single(); var items = (from obj in query.Elements("City") where obj.Attribute("id").Value == id select obj).Single(); var district = (from obj in items.Elements(type) select new { id = obj.Attribute("id").Value, name = obj.Attribute("name").Value, }).ToList(); foreach (var item in district) { str.Append("<option value=\"" + item.id + "\">" + item.name + "</option>\n"); } return str.ToString(); } public bool IsReusable { get { return false; } }}default.aspx页面调用<%@ Page Language="C#" AutoEventWireup="true" EnableEventValidation="false" CodeFile="Default.aspx.cs" Inherits="_Default" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head runat="server"> <script src="js/jquery.js" type="text/javascript"></script> <script src="js/validation.js" type="text/javascript"></script> <script src="js/choice/choice.js" type="text/javascript"></script> <title></title></head><body> <form id="form1" runat="server"> <div> <input id="hf_City" class="v_city" type="hidden" runat="server"/> <input id="hf_District" class="v_district" type="hidden" runat="server"/> <asp:DropDownList ID="drp_Province" runat="server" class="qp_null_select _province"> </asp:DropDownList> <asp:DropDownList ID="drp_City" runat="server" class="qp_null_select _city"> </asp:DropDownList> <asp:DropDownList ID="drp_District" runat="server" class="qp_null_select _district"> </asp:DropDownList> <asp:Button ID="btn_Update" runat="server" OnClick="btn_Update_Click" Text="添 加" class="uBtn"/> </div> </form></body></html>
default.aspx.csusing System;using System.Linq;using System.Xml.Linq;using System.Web.UI.WebControls;using System.Web.UI;public partial class _Default : System.Web.UI.Page{ protected void Page_Load(object sender, EventArgs e) { try { if (!IsPostBack) { ProvinceDrpDataBound(); } } catch { } } private void ProvinceDrpDataBound() { string path = Server.MapPath("~/xml/area/area.xml"); XElement xElement = XElement.Load(path); var query = (from obj in xElement.Elements("Province") select new { id = obj.Attribute("id").Value, name = obj.Attribute("name").Value, }); drp_Province.DataSource = query; drp_Province.DataTextField = "name"; drp_Province.DataValueField = "id"; drp_Province.DataBind(); drp_Province.Items.Insert(0, new ListItem("请选择：", "0")); } protected void btn_Update_Click(object sender, EventArgs e) { Response.Write(drp_Province.SelectedItem.Text + hf_City.Value + hf_District.Value); }}不足之处 请多多指教
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