jquery + ashx DropDownList 二级

前台：

Code

<%@ Page Language="C#" AutoEventWireup="true" 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">
    <title></title>

    <script src="javascript/jquery-1.3.2.min.js" type="text/javascript"></script>

    <script type="text/javascript">
    <!--
        $(function() {
            $("#ddlMenuOne").append(
                "<option value='-1' selected='selected'>请选择...</option>");
            ddlMenuTwoInit();

            $.getJSON(
                "DDLMenu.ashx",
                { menuOneId: $("#ddlMenuOne").val() },
                function(json) {
                    $.each(json, function(i) {
                        $("#ddlMenuOne").append(
                        "<option value='" + json[i].Id + "'>"
                            + json[i].MenuOneName + "</option>"
                        );
                    });
                });

            $("#ddlMenuOne").change(function(event) {
                if ($("#ddlMenuOne").val() !== "-1") {
                    $.getJSON(
                        "DDLMenu.ashx",
                        { menuOneId: $("#ddlMenuOne").val() },
                        function(json) {
                            ddlMenuTwoInit();
                            $.each(json, function(i) {
                                $("#ddlMenuTwo").append(
                            "<option value='" + json[i].Id + "'>"
                                + json[i].MenuTwoName + "</option>"
                            );
                            });
                        });
                }
                else {
                    ddlMenuTwoInit();
                }
            });
        });

        function ddlMenuTwoInit() {
            $("#ddlMenuTwo").html("").append(
                "<option value='-1' selected='selected'>请选择...</option>");
        }
     //--> 
    </script>

</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:DropDownList ID="ddlMenuOne" runat="server">
        </asp:DropDownList>
        <br />
        <asp:DropDownList ID="ddlMenuTwo" runat="server">
        </asp:DropDownList>
    </div>
    <ul id="list">
    </ul>
    </form>
</body>
</html>

后台 ashx

Code

<%@ WebHandler Language="C#" Class="DDLMenu" %>

using System;
using System.Web;
using System.Collections.Generic;
using System.Web.Script.Serialization;
using System.ServiceModel.Dispatcher;

public class DDLMenu : IHttpHandler
{

    public void ProcessRequest(HttpContext context)
    {

        context.Response.ContentType = "text/plain";

        int menuOneId = Convert.ToInt32(context.Request.QueryString["menuOneId"]);

        JsonQueryStringConverter jq = new JsonQueryStringConverter();

        //JavaScriptSerializer serializer = new JavaScriptSerializer();
        //string data = serializer.Serialize(list);

        string data = "";

        if (menuOneId == -1)
        {
            List<MenuOne> list = new List<MenuOne>();

            list.Add(new MenuOne { Id = 1, MenuOneName = "城市" });

            list.Add(new MenuOne { Id = 2, MenuOneName = "年份" });

            list.Add(new MenuOne { Id = 3, MenuOneName = "蔬菜" });

            data = jq.ConvertValueToString(list, typeof(List<MenuOne>));
        }
        else
        {
            List<MenuTwo> list = new List<MenuTwo>();

            list.Add(new MenuTwo { Id = 1, MenuOneId = 1, MenuTwoName = "淮安" });

            list.Add(new MenuTwo { Id = 2, MenuOneId = 1, MenuTwoName = "南京" });

            list.Add(new MenuTwo { Id = 3, MenuOneId = 1, MenuTwoName = "盐城" });

            list.Add(new MenuTwo { Id = 4, MenuOneId = 1, MenuTwoName = "苏州" });

            list.Add(new MenuTwo { Id = 5, MenuOneId = 1, MenuTwoName = "无锡" });

            list.Add(new MenuTwo { Id = 6, MenuOneId = 1, MenuTwoName = "镇江" });

            list.Add(new MenuTwo { Id = 7, MenuOneId = 1, MenuTwoName = "泰州" });

            list.Add(new MenuTwo { Id = 8, MenuOneId = 2, MenuTwoName = "2000" });

            list.Add(new MenuTwo { Id = 9, MenuOneId = 2, MenuTwoName = "2001" });

            list.Add(new MenuTwo { Id = 10, MenuOneId = 2, MenuTwoName = "2002" });

            list.Add(new MenuTwo { Id = 11, MenuOneId = 2, MenuTwoName = "2003" });

            list.Add(new MenuTwo { Id = 12, MenuOneId = 2, MenuTwoName = "2004" });

            list.Add(new MenuTwo { Id = 13, MenuOneId = 2, MenuTwoName = "2005" });

            list.Add(new MenuTwo { Id = 14, MenuOneId = 2, MenuTwoName = "2006" });

            list.Add(new MenuTwo { Id = 15, MenuOneId = 3, MenuTwoName = "黄瓜" });

            list.Add(new MenuTwo { Id = 16, MenuOneId = 3, MenuTwoName = "萝卜" });

            list.Add(new MenuTwo { Id = 17, MenuOneId = 3, MenuTwoName = "白菜" });

            list.Add(new MenuTwo { Id = 18, MenuOneId = 3, MenuTwoName = "猪肉" });

            list.Add(new MenuTwo { Id = 19, MenuOneId = 3, MenuTwoName = "鸡腿" });

            list.Add(new MenuTwo { Id = 20, MenuOneId = 3, MenuTwoName = "闫腾" });

            list.Add(new MenuTwo { Id = 21, MenuOneId = 3, MenuTwoName = "黄鱼" });

            List<MenuTwo> newList = new List<MenuTwo>();
            int n = list.Count;
            for (int i = 0; i < n; i++)
            {
                if (list[i].MenuOneId == menuOneId)
                    newList.Add(list[i]);
            }

            data = jq.ConvertValueToString(newList, typeof(List<MenuTwo>));

        } 
        
        context.Response.Write(data);
    }

    public bool IsReusable
    {
        get
        {
            return false;
        }
    }

}

哈哈！~

posted on 2010-02-03 17:24 ifunnyface 阅读(1271) 评论(2) 编辑收藏举报