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Ajax无刷新实现图片切换2007-07-24 12:10:00

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1.页面cs代码
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;
using AjaxPro;

public partial class _Default : System.Web.UI.Page
{
    protected string displayCategoryID;
    protected void Page_Load(object sender, EventArgs e)
    {
        Utility.RegisterTypeForAjax(typeof(AjaxMethod));
        displayCategoryID = "17";
    }
}

2.html代码
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Ajax无刷新实现图片切换特效</title>
    <link type="text/css" href="css/tree.css" rel="stylesheet">
        <link type="text/css" href="css/global.css" rel="stylesheet">
        <script type=text/javascript src=javascript/tree.js></script>
</head>
<body onload="PreloadImage('<%=displayCategoryID %>');">
    <form id="form1" runat="server"> 
            <div id="photoarea" style="width: 514px; height: 496px; left: 0px; top: 0px;">
               
                <div id="photo" style="left: 5px; top: 9px; height: 432px;">
                    <img id="slideShow" src="images/space.gif" style="filter:revealTrans(duration=2,transition=23)">
                   
                </div>               
                <div id="op" align="left" style="left: 12px; top: 457px">
                    <span id="progress" style="FONT-SIZE: 20px"></span>
                    &nbsp;&nbsp;&nbsp;
                    <img id="btnPlay" src="images/play_bw.gif">
                    <img id="btnPause" src="images/pause_bw.gif">
                    <img id="btnPrev" src="images/prev_bw.gif">
                    <img id="btnNext" src="images/next_bw.gif">
                 </div>
            </div>
           
            <SCRIPT type="text/javascript">
           
            // 定时器
            var timeDelay;
           
            // 图片自动浏览时的时间间隔
            var timeInterval = 4000;
           
            // Array对象,存储图片文件的路径
            var image;
           
            // 当前显示的图片序号
            var num;
           
            // 当前浏览状态,该状态用于控制4个按钮的状态
            var nStatus;
           
            // 图片显示区域
            var slideShow = el("slideShow");
           
            // 图片信息数据表
            var dt;
           
            // 预加载图片信息
            function PreloadImage(iCategoryID)
            {
                // 采用同步调用的方式获取图片的信息               
                var ds = AjaxMethod.GetPhotoList(iCategoryID).value;
               
                // 如果返回了结果
                if (ds)
                {
                    // 判断数据表是否不为空
                    if (ds.Tables[0].Rows.length > 0)
                    {
                        // 返回的图片信息数据表
                        dt = ds.Tables[0];
                       
                        // 用image对象存储图片的文件路径
                        image = new Array();
                       
                        // 图片在Photos目录下
                        for (var i = 0; i < dt.Rows.length; i++)
                        {
                            image.push("Photos/" + dt.Rows[i].photo_path);
                        }
                                   
                        // imagePreload对象用于实现图片的预缓存
                        var imagePreload = new Array();
                        for (var i = 0;i < image.length;i++)
                        {
                            // 通过新建Image对象,并将其src属性指向图片的URL
                            // 显现图片的预缓存
                            imagePreload[i] = new Image();
                            imagePreload[i].src = image[i];
                        }

                        // 初始化一些变量
                        num = -1;
                        nStatus = 0x09;
                       
                        // 加载第一张图片
                        next_image();               
                    }
                    else // 分类下没有图片
                    {
                        alert("该目录下没有图片！");
                    }
                }
               
            }

            // 实现图片切换时的效果
            function image_effects()
            {
                // Transition的值为0~23之间的随机数,代表24种切换效果
                // 具体值与效果之间的对应见MSDN
                slideShow.filters.revealTrans.Transition = Math.random() * 23;
               
                // 应用并播放切换效果
                slideShow.filters.revealTrans.apply();
                slideShow.filters.revealTrans.play();
            }

            // 切换到上一张图片
            function previous_image()
            {
                // 图片序号向前移动,如果已经是第一张,则切换到最后一张
                num += image.length - 1;
                num %= image.length;
               
                // 图片切换的效果
                image_effects();
               
                // 将<img>对象的src属性设置为当前num对应的路径
                // 切换图片的显示
                slideShow.src = image[num];
               
                // 获取图片的标题、说明信息
                getPhotoInfo();
               
                // 设置按钮状态
                setBtnStatus();
            }

            // 切换到下一张图片
            function next_image()
            {
                // 当前图片的序号向后移动,如果已经是最后一张,
                // 则切换到第一张图片
                num++;
                num %= image.length;
               
                // 图片的切换效果
                image_effects();
               
                // 将<img>对象的src属性设置为当前num对应的路径
                // 切换图片的显示
                slideShow.src = image[num];
               
                // 获取图片的标题、说明信息
                getPhotoInfo();
               
                // 设置按钮状态
                setBtnStatus();
            }

            // 自动浏览图片
            function slideshow_automatic()
            {
                // 当前图片的序号向后移动,如果已经是最后一张,
                // 则切换到第一张图片
                num++;
                num %= image.length;
               
                // 图片的切换效果
                image_effects();
               
                // <img>对象的src属性设置为当前num指定的URL
                // 切换图片的显示
                slideShow.src = image[num];
               
                // 获取图片的标题、说明信息
                getPhotoInfo();
               
                // 设置按钮的状态,使播放按钮失效,暂停按钮有效
                nStatus &= 0x0E;
                nStatus |= 0x02;
                setBtnStatus();
               
                // slideshow_automatic函数每隔一段时间自动执行
                timeDelay = setTimeout("slideshow_automatic()", timeInterval);
            }
           
            // 停止自动播放
            function pauseSlideShow()
            {
                // 清除定时器,不再执行slideshow_automatic函数
                clearTimeout(timeDelay);

                // 设置按钮的状态,使播放按钮有效,暂停按钮失效
                nStatus &= 0x0d;
                nStatus |= 0x01;
                setBtnStatus();               
            }
           
            // 设置按钮的状态:
            // 判断的依据是当前是否处于自动播放的状态
            // 以及当前显示的图片是否第一张或最后一张图片
            function setBtnStatus(bDir)
            {
                // 如果是第一张图片
                if (num == 0)
                {
                    // 向前切换图片的按钮失效
                    nStatus &= 0x0b;
                }
               
                // 如果是最后一张图片
                if (num == (image.length - 1))
                {
                    // 向后切换图片的按钮失效
                    nStatus &= 0x07;
                }
               
                // 如果既不是最后一张,也不是第一张图片
                if (num != 0 && num !=(image.length - 1))
                {
                    // 向前、向后切换图片的按钮均有效
                    nStatus |= 0x0c;
                }
           
                // 根据nStatus每一位的值确定4个按钮的背景图
                el("btnPlay").src = ((nStatus & 0x01) == 0x01) ?
                    "images/play.gif" : "images/play_bw.gif";
                el("btnPause").src = ((nStatus & 0x02) == 0x02) ?
                    "images/pause.gif" : "images/pause_bw.gif";
                el("btnPrev").src = ((nStatus & 0x04) == 0x04) ?
                    "images/prev.gif" : "images/prev_bw.gif";
                el("btnNext").src = ((nStatus & 0x08) == 0x08) ?
                    "images/next.gif" : "images/next_bw.gif";

                // 根据nStatus每一位的值确定鼠标移动到4个按钮上方时的形状
                el("btnPlay").style.cursor = ((nStatus & 0x01) == 0x01) ?
                    "pointer" : "default";
                el("btnPause").style.cursor = ((nStatus & 0x02) == 0x02) ?
                    "pointer" : "default";
                el("btnPrev").style.cursor = ((nStatus & 0x04) == 0x04) ?
                    "pointer" : "default";
                el("btnNext").style.cursor = ((nStatus & 0x08) == 0x08) ?
                    "pointer" : "default";

                // 根据nStatus的每一位确定4个按钮是否具有onclick响应
                el("btnPlay").onclick = ((nStatus & 0x01) == 0x01) ?
                    function() {slideshow_automatic();} : function() {return false;};
                el("btnPause").onclick = ((nStatus & 0x02) == 0x02) ?
                    function() {pauseSlideShow();} : function() {return false;};
                el("btnPrev").onclick = ((nStatus & 0x04) == 0x04) ?
                    function() {previous_image();} : function() {return false;};
                el("btnNext").onclick = ((nStatus & 0x08) == 0x08) ?
                    function() {next_image();} : function() {return false;};
               
                // 显示当前图片浏览的进度
                el("progress").innerHTML = (num + 1) + " / " + image.length;
            }
           
            // 获取图片的标题、说明信息
            function getPhotoInfo()
            {
                return;
                // 图片ID号
                var id = dt.Rows[num].id;
               
                // 如果存在
                if (id)
                {
                    // 异步调用Ajax方法GetPhotoInfo
                    AjaxMethod.GetPhotoInfo(id, GetPhotoInfo_callback);
                }
            }
           
            // 回调函数,根据响应的内容显示标题和说明信息
            function GetPhotoInfo_callback(response)
            {
                // 获取图片的信息
                var dt_photo = response.value.Tables[0];
               
                // 如果图片存在
                if (dt_photo.Rows.length > 0)
                {
                    // 显示图片的标题和说明
                    el("title").innerHTML = dt_photo.Rows[0].photo_title;
                    el("description").innerHTML = dt_photo.Rows[0].photo_description;
                }
            }           
            </SCRIPT>
    </form>
</body>
</html>

3.AjaxMethod类
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;
using System.Data.SqlClient;
using AjaxPro;

/**//// <summary>
/// Summary description for AjaxMethod
/// </summary>
public class AjaxMethod
{
    public AjaxMethod()
    {
        //
        // TODO: Add constructor logic here
        //
    }
    public static string ConnectionString = ConfigurationSettings.AppSettings["ConnectionString"].ToString();

    GetDataSet#region GetDataSet
    public static DataSet GetDataSet(string sql)
    {
        SqlDataAdapter sda = new SqlDataAdapter(sql, ConnectionString);
        DataSet ds = new DataSet();
        sda.Fill(ds);
        if (ds != null)
            return ds;
        else
            return null;
    }
    #endregion
   
    /**//// <summary>
    /// 获取某个分类下图片的id和photo_path信息
    /// </summary>
    /// <param name="iCategoryID">分类ID号</param>
    /// <returns>图片信息(id, photo_path)的信息</returns>
    [AjaxMethod(HttpSessionStateRequirement.ReadWrite)]
    public static DataSet GetPhotoList(int iCategoryID)
    {
        string sql = string.Format("SELECT id, photo_path FROM Photo WHERE photo_category_id = {0}", iCategoryID);
        return GetDataSet(sql);
    }

    /**//// <summary>
    /// 获取图片信息(标题、说明)
    /// </summary>
    /// <param name="id">图片id</param>
    /// <returns>图片信息</returns>
    [AjaxMethod(HttpSessionStateRequirement.ReadWrite)]
    public static DataSet GetPhotoInfo(int id)
    {
        string sql = string.Format("SELECT photo_title, photo_description FROM Photo WHERE id = {0}", id);

        return GetDataSet(sql);
    }
   
}

4.Web.config
<?xml version="1.0"?>
<configuration>
  <appSettings>
    <add key="ConnectionString" value="Data Source=localhost;user id=sa;password=sa;initial catalog=DB"/>
  </appSettings>
    <connectionStrings/>
    <system.web>
      <httpHandlers>
        <add verb="POST,GET" path="ajaxpro/*.ashx" type="AjaxPro.AjaxHandlerFactory, AjaxPro"/>
      </httpHandlers>      
        <compilation debug="false" />       
        <authentication mode="Windows" />       
    </system.web>
</configuration>

5.sql脚本
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[Photo]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
drop table [dbo].[Photo]
GO

CREATE TABLE [dbo].[Photo] (
    [id] [int] IDENTITY (1, 1) NOT NULL ,
    [photo_title] [varchar] (128) COLLATE Chinese_PRC_CI_AS NULL ,
    [photo_description] [text] COLLATE Chinese_PRC_CI_AS NULL ,
    [photo_category_id] [int] NULL ,
    [photo_path] [varchar] (255) COLLATE Chinese_PRC_CI_AS NULL
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
GO

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