搜狗网站制作,网页制作模板扩展名,网站建设的毕业设计选题管理系统,宁夏网站备案本文主要列举了省市三级联动的DropDownListAjax的三种框架(aspnet/Jquery/ExtJs)示例。前段时间需要作一个的Web前端应用#xff0c;需要用多个框架#xff0c;一个典型的应用场景是省市三级联动#xff0c;基于此应用#xff0c;特将三种主要的ajax框架略作整理#xff0…本文主要列举了省市三级联动的DropDownListAjax的三种框架(aspnet/Jquery/ExtJs)示例。前段时间需要作一个的Web前端应用需要用多个框架一个典型的应用场景是省市三级联动基于此应用特将三种主要的ajax框架略作整理方便有需要的朋友查阅。在示例之前我们先设置一个演示数据源新建一个项目项目结构如图主要文件如下AreaModel.cs:using System;using System.Collections.Generic;namespace Downmoon.Framework.Model{#region PopularAreapublic class Area{private string m_Area_ID;/// /// 地区编号/// public string Area_ID{get { return m_Area_ID; }set { m_Area_ID value; }}private string m_Area_Name;/// /// 地区名称/// public string Area_Name{get { return m_Area_Name; }set { m_Area_Name value; }}private double m_Area_Order;/// /// 排序/// public double Area_Order{get { return m_Area_Order; }set { m_Area_Order value; }}private int m_Area_Layer;/// /// 层级/// public int Area_Layer{get { return m_Area_Layer; }set { m_Area_Layer value; }}private string m_Area_FatherID;/// /// 父级ID/// public string Area_FatherID{get { return m_Area_FatherID; }set { m_Area_FatherID value; }}public Area() { }public Area(string id, string name, double order, int layer, string father){this.Area_ID id;this.Area_Name name;this.m_Area_Order order;this.m_Area_Layer layer;this.m_Area_FatherID father;}}#endregion}AreaControl.cs:using System;using System.Collections.Generic;using Downmoon.Framework.Model;namespace Downmoon.Framework.Controllers{public class AreaList : IArea{// Area singletonprivate static AreaList instance;public static AreaList Instance{get{if (AreaList.instance null){AreaList.instance new AreaList();}return AreaList.instance;}}public List GetAreaList(){List Areas new List();Areas.Add(new Area(110000, 北京市, 0, 1, 000000));Areas.Add(new Area(110100, 市辖区, 0, 2, 110000));Areas.Add(new Area(110101, 东城区, 0, 3, 110100));Areas.Add(new Area(110102, 西城区, 0, 3, 110100));Areas.Add(new Area(110103, 崇文区, 0, 3, 110100));Areas.Add(new Area(330000, 浙江省, 0, 1, 000000));Areas.Add(new Area(330100, 杭州市, 0, 2, 330000));Areas.Add(new Area(330200, 宁波市, 0, 2, 330000));Areas.Add(new Area(330102, 上城区, 0, 3, 330100));Areas.Add(new Area(330103, 下城区, 0, 3, 330100));Areas.Add(new Area(330104, 江干区, 0, 3, 330100));Areas.Add(new Area(330105, 拱墅区, 0, 3, 330100));Areas.Add(new Area(330106, 西湖区, 0, 3, 330100));Areas.Add(new Area(330203, 海曙区, 0, 3, 330200));Areas.Add(new Area(330204, 江东区, 0, 3, 330200));Areas.Add(new Area(330205, 江北区, 0, 3, 330200));Areas.Add(new Area(330206, 北仑区, 0, 3, 330200));Areas.Add(new Area(330211, 镇海区, 0, 3, 330200));return Areas;}public List GetAreaListFindByParentID(string filter){return GetAreaList().FindAll(delegate(Area ar){return ar.Area_FatherID filter;});}}}Factory.csusing System;using System.Collections.Generic;//using Downmoon.Framework.Model;namespace Downmoon.Framework.Controllers{public class Factory{public static IArea GetAreaController(){return AreaList.Instance;}}}IArea.csusing System;using System.Collections.Generic;using System.Text;using Downmoon.Framework.Model;namespace Downmoon.Framework.Controllers{public interface IArea{List GetAreaList();List GetAreaListFindByParentID(string filterID);}}一、基于aspnet自带的Ajax框架主要好处是与asp.net完全集成无需写过多的 js。缺点是在framework2下需作一些设置在Framework 4下无需设置。Framework 2需首先在web.config文件中作配置typeSystem.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version1.0.61025.0, Cultureneutral, PublicKeyToken31bf3856ad364e35/typeSystem.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version1.0.61025.0, Cultureneutral, PublicKeyToken31bf3856ad364e35/前台页面请选择省/市/区AutoPostBacktrue onselectedindexchangeddpProvince_SelectedIndexChanged /onselectedindexchangeddpCity_SelectedIndexChanged //正在查询请稍候……………………Framework 4与代码完全一样只是无需在web.config中作配置。如图二、基于JQuery1.4.1的Ajax框架主要好处是与后续版本的asp.net完全集成。基于ashx作一个 Request主要代码using System;using System.Collections.Generic;using System.Web;using Downmoon.Framework.Controllers;using Downmoon.Framework.Model;using System.Text;namespace dropdown_JQuery14_Net2{/// /// Summary description for AjaxRequest/// public class AjaxRequest : IHttpHandler{public void ProcessRequest(HttpContext context){string Area_FatherID string.Empty;if (context.Request[pid] ! null){ Area_FatherID context.Request[pid].ToString(); }string parentId string.Empty;//mydbDataContext db new mydbDataContext();//根据传过来的Value值 进行查询//List list db.ChinaStates.Where(c c.ParentAreaCode strId).ToList();List list Factory.GetAreaController().GetAreaListFindByParentID(Area_FatherID);context.Response.ContentType application/json;context.Response.ContentEncoding Encoding.UTF8;context.Response.Write(ListToJson(list));context.Response.End();}public string ListToJson(List list){StringBuilder sb new StringBuilder();if (list ! null){sb.Append([);for (int i 0; i list.Count; i){sb.Append({);sb.Append(\Area_ID\:\ list[i].Area_ID \,);sb.Append(\Area_Name\:\ list[i].Area_Name \);//sb.Append(\Area_FatherID\:\ list[i].Area_FatherID \);if (i ! list.Count - 1){sb.Append(},);}}}sb.Append(});sb.Append(]);return sb.ToString();}public bool IsReusable{get{return false;}}}}前台aspx#dpCity{display: none;position: relative;}#dpArea{display: none;position: relative;}--{display: none;position: relative;}#dpArea{display: none;position: relative;}请选择省/市/区 三、基于ExtJS 3.2的Ajax框架。后台ashx:using System;using System.Collections.Generic;using System.Web;using Downmoon.Framework.Controllers;using Downmoon.Framework.Model;using System.Text;namespace dropdown_ExtJS32_Net2.Ajax{/// /// Summary description for GetAreaXml/// public class GetAreaXml : IHttpHandler{//string baseCode 000000;public void ProcessRequest(HttpContext context){string parentId 000000;if (context.Request[pid] ! null){parentId context.Request[pid].ToString();}//parentId (parentId.Length 0) ? parentId : 000000;string parentId2 000000;if (context.Request[pid2] ! null){ parentId2 context.Request[pid2].ToString();}#region tony 2010.2.7 updateList list new List();//if (parentId.Length 0)//{list Factory.GetAreaController().GetAreaListFindByParentID(parentId);//}else if (parentId2.Length 0){ list Factory.GetAreaController().GetAreaListFindByParentID(parentId2);}#endregioncontext.Response.AddHeader(Cache-Control, no-cache, must-revalidate);context.Response.ContentEncoding System.Text.Encoding.UTF8;context.Response.ContentType text/html;StringBuilder sb new StringBuilder();for (int i 0; i list.Count; i){sb.Append({\Area_Name\:\ list[i].Area_Name \,);sb.Append(\Area_ID\:\ list[i].Area_ID \},);}string json sb.ToString().TrimEnd(,);context.Response.Write({\Results\:[ json ]});}public bool IsReusable{get{return false;}}}}前台页面.aspxdemo a dropdownlist by extjs 3.2 请选择省市县效果如图邀月注本文版权由邀月和CSDN共同所有转载请注明出处。助人等于自助! 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