Ajax无刷新实现图片切换特效

一、AjaxMethod
using System;
using System.Data;
using System.Data.SqlClient;

字串1

namespace AjaxImage
{
/**//// <summary>
/// AjaxMethod 的摘要说明。
/// </summary>
public class AjaxMethod
{
public AjaxMethod()
{
}
public static string ConnectionString = System.Configuration.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 字串7

[AjaxPro.AjaxMethod]
public static DataSet GetPhotoList( int iCategoryID )
{
string sql = "Select id,photo_path FROM Photo where photo_category_id=" iCategoryID ;
return GetDataSet( sql );
}
[AjaxPro.AjaxMethod]
public static DataSet GetPhotoInfo( int id )
{
string sql = string.Format("SELECT photo_title, photo_description FROM Photo WHERE id = {0}", id);
return GetDataSet( sql );
}

字串6

}//end class
}

二、页面HTML代码：
<div id="Layer1" style="Z-INDEX:1; LEFT:104px; WIDTH:501px; POSITION:absolute; TOP:28px; HEIGHT:345px">
<img name="slideShow" src="images/space.gif" width="500" height="300" style="FILTER:revealTrans(duration=2,transition=23)">
</div>
<div id="Layer2" style="Z-INDEX:2; LEFT:490px; WIDTH:112px; POSITION:absolute; TOP:380px; HEIGHT:26px">
<img id="btnPlay" src="images/play_bw.gif" onclick="slideshow_automatic()" onmouseover="this.src='images/play.gif'"
onmouseout="this.src='images/play_bw.gif'"> <img id="btnPause" src="images/pause_bw.gif" onclick="pauseSlideShow()" onmouseover="this.src='images/pause.gif'"
onmouseout="this.src='images/pause_bw.gif'"> <img id="btnPrev" src="images/prev_bw.gif" onclick="previous_image()" onmouseover="this.src='images/prev.gif'"
onmouseout="this.src='images/prev_bw.gif'"> <img id="btnNext" src="images/next_bw.gif" onclick="next_image()" onmouseover="this.src='images/next.gif';next_image()" 字串9
onmouseout="this.src='images/next_bw.gif'">
</div>
三、JAVASCRIPT:
<script language="javascript" 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;

// 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 = AjaxImage.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) 字串3
{
// 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[i] = "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];

字串4

}

字串1

// 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！");