实现代码：
1、html：
<html> <head> <title></title> <style type="text/css"> select { width: 150px; } </style> <script src="https://www.jb51.net/js/Jquery1.7.js" type="text/javascript"></script> <script type="text/javascript"> $(function () { $.ajax({ type: "post", contentType: "application/json", url: "WebService1.asmx/GetProvince", data: "{}", success: function (result) { var stroption = ''; for (var i = 0; i < result.d.length; i++) { stroption += '<option value=' + result.d[i].provinceID + '>'; stroption += result.d[i].provincename; stroption += '</option>'; } $('#seprovince').append(stroption); } }) $('#seprovince').change(function () { $('#secity option:gt(0)').remove(); $('#searea option:gt(0)').remove(); $.ajax({ type: "post", contentType: "application/json", url: "WebService1.asmx/GetCItyByPro", data: "{proid:'" + $(this).val() + "'}", success: function (result) { var strocity = ''; for (var i = 0; i < result.d.length; i++) { strocity += '<option value=' + result.d[i].cityID + '>'; strocity += result.d[i].cityname; strocity += '</option>'; } $('#secity').append(strocity); } }) }) $('#secity').change(function () { $('#searea option:gt(0)').remove(); $.ajax({ type: "post", contentType: "application/json", url: "WebService1.asmx/GetAreaByCity", data: "{cityid:'" + $(this).val() + "'}", success: function (result) { var stroarea = ''; for (var i = 0; i < result.d.length; i++) { stroarea += '<option value=' + result.d[i].areaID + '>'; stroarea += result.d[i].areaname; stroarea += '</option>'; } $('#searea').append(stroarea); } }) }) }) </script> </head> <body> <table> <tr> <td> 用户名 </td> <td> <input type="text" /> </td> </tr> <tr> <td> 密码 </td> <td> <input type="text" /> </td> </tr> <tr> <td> 确认密码 </td> <td> <input type="text" /> </td> </tr> <tr> <td> 邮箱 </td> <td> <input type="text" /> </td> </tr> <tr> <td> 地址 </td> <td> <select> <option>--请选择--</option> </select> 省 <select> <option>--请选择--</option> </select>市 <select> <option>--请选择--</option> </select>县 </td> </tr> </table> </body> </html>
2、WebService1.asmx
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.Services; namespace 省市县三级联动 { /// <summary> /// WebService1 的摘要说明 /// </summary> [WebService(Namespace = "http://tempuri.org/")] [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)] [System.ComponentModel.ToolboxItem(false)] // 若要允许使用 ASP.NET AJAX 从脚本中调用此 Web 服务，请取消对下行的注释。 [System.Web.Script.Services.ScriptService] public class WebService1 : System.Web.Services.WebService { [WebMethod] public string HelloWorld() { return "Hello World"; } [WebMethod] public List<Model.province> GetProvince() { BLL.province bpro = new BLL.province(); List<Model.province> list = bpro.GetListModel(); return list; } [WebMethod] public List<Model.city> GetCItyByPro(string proid) { BLL.city bcity = new BLL.city(); List<Model.city> list = bcity.GetListModel("father='" + proid + "'"); return list; } [WebMethod] public List<Model.area> GetAreaByCity(string cityid) { BLL.area barea = new BLL.area(); List<Model.area> list = barea.GetListModel("father='" + cityid + "'"); return list; } } }
在三层的Bll层中的city.cs和area.cs中分别添加以下属性
//city.cs： public List<Model.city> GetListModel(string strsql) { return dal.GetListModel(strsql); } //area.cs： public List<Model.area> GetListModel(string strsql) { return dal.GetListModel(strsql); }
在三层的DAL层中的city.cs和area.cs中分别添加以下方法
//city.cs： public System.Collections.Generic.List<Model.city> GetListModel(string strsql) { System.Collections.Generic.List<Model.city> list = new System.Collections.Generic.List<Model.city>(); DataTable dt = GetList(strsql).Tables[0]; foreach (DataRow row in dt.Rows) { Model.city mcity = new Model.city(); mcity.id = Convert.ToInt32(row["id"]); mcity.cityID = row["cityID"].ToString(); mcity.cityname = row["cityname"].ToString(); list.Add(mcity); } return list; } //area.cs： public System.Collections.Generic.List<Model.area> GetListModel(string strsql) { DataTable dt = GetList(strsql).Tables[0]; System.Collections.Generic.List<Model.area> list = new System.Collections.Generic.List<Model.area>(); foreach (DataRow row in dt.Rows) { Model.area marea = new Model.area() { id = Convert.ToInt32(row["id"]), areaID = row["areaID"].ToString(), areaname = row["areaname"].ToString() }; list.Add(marea); } return list; }