利用javascript从数据库取数据来实现CSDN首页图片的切换效果(新增下载地址)

说明:请注意标有删除线的地方需要删除,粗斜体部分为需要修改或者添加代码

下载地址

我在网上下载了一个网站的部分源代码 ，看到里面有实现CSDN首页图片的切换效果。虽然以前看网上有许多转载的，但是里面的代码都是在js中定义一个数组来存放图片的信息，但是今天这个方法更加灵活啊！只需要以下几步即可。

1.创建sql数据库：
CREATE TABLE [dbo].[images] (
[imageid] [int] IDENTITY (1, 1) NOT NULL ,
[imgUrl] [varchar] (50) COLLATE Chinese_PRC_CI_AS NULL ,
[imgText] [varchar] (50) COLLATE Chinese_PRC_CI_AS NULL ,
[imgLink] [nvarchar] (100) COLLATE Chinese_PRC_CI_AS NULL ,
[imgAlt] [nvarchar] (50) COLLATE Chinese_PRC_CI_AS NULL
) ON [PRIMARY]
2.引用外部css代码
<link href="styles/StyleSheet2.css" rel="stylesheet" type="text/css" />
3.写js代码：（不知道为什么放在一个单独的js文件不行）
<script language="javascript" type="text/javascript" >
var imgWidth=248; //图片宽
var imgHeight=200; //图片高
var textFromHeight=21; //焦点字框高度 (单位为px)
var textStyle="whiter"; //焦点字class style (不是连接class)
var textLinkStyle="whiter"; //焦点字连接class style
var buttonLineOn="#f60"; //button下划线on的颜色
var buttonLineOff="#000"; //button下划线off的颜色
var TimeOut=5000; //每张图切换时间 (单位毫秒);
var imgUrl=new Array();
var imgLink=new Array();
var imgtext=new Array();
var imgAlt=new Array();
var adNum=0;
//焦点字框高度样式表 开始
document.write('<style type="text/css">');
document.write('#focuseFrom{width:'+(imgWidth+2)+';margin: 0px; padding:0px;height:'+(imgHeight+textFromHeight)+'px; overflow:hidden;}');
document.write('#txtFrom{height:'+textFromHeight+'px;line-height:'+textFromHeight+'px;width:'+imgWidth+'px;overflow:hidden;}');
document.write('#imgTitle{width:'+imgWidth+';top:-'+(textFromHeight+14)+'px;height:18px}');
document.write('</style>');
document.write('<div id="focuseFrom">');
//焦点字框高度样式表 结束

imgUrls="<%=imgUrl%>";//获取后台cs代码的属性
imgtexts="<%=imgtext%>";
imgLinks="<%=imgLink%>";
imgAlts="<%=imgAlt%>";

imgUrl=imgUrls.split(",");
imgtext=imgUrls.split(",");
imgLink=imgUrls.split(",");
imgAlt=imgUrls.split(",");

function changeimg(n)
{
adNum=n;
window.clearInterval(theTimer);
adNum=adNum-1;
nextAd();
}
function goUrl(){
window.open(imgLink[adNum],'_blank');
}
//NetScape开始
if (navigator.appName == "Netscape")
{
document.write('<style type="text/css">');
document.write('.buttonDiv{height:4px;width:21px;}');
document.write('</style>');
function nextAd(){
if(adNum<(imgUrl.length-1))adNum++;
else adNum=1;
theTimer=setTimeout("nextAd()", TimeOut);
document.images.imgInit.src=imgUrl[adNum];
document.images.imgInit.alt=imgAlt[adNum];
//document.getElementById('focustext').innerHTML=imgtext[adNum];//在图片下面显示图片的路径
document.getElementById('imgLink').href=imgLink[adNum];

}
document.write('<a id="imgLink" href="'+imgLink[1]+'" target=_blank class="p1"><img src="'+imgUrl[1]+'" name="imgInit" width='+imgWidth+' height='+imgHeight+' border=1 alt="'+imgAlt[1]+'" class="imgClass"></a><div id="txtFrom"><span id="focustext" class="'+textStyle+'">'+imgtext[1]+'</span></div>');

document.write('<div id="imgTitle">');
document.write('<div id="imgTitle_down">');
//数字按钮代码开始
for(var i=1;i<imgUrl.length;i++){document.write('<a href="javascript:changeimg('+i+')" class="button" style="cursor:hand" title="'+imgAlt[i]+'">'+i+'</a>');}
//数字按钮代码结束
document.write('</div>');
document.write('</div>');
document.write('</div>');
nextAd();
}
//NetScape结束
//IE开始
else
{
var count=imgUrl.length-1;
for (i=1;i<imgUrl.length;i++) {
if( (imgUrl[i]!="") && (imgLink[i]!="")&&(imgtext[i]!="")&&(imgAlt[i]!="") ) {
count++;
} else {
break;
}
}
function playTran(){
if (document.all)
imgInit.filters.revealTrans.play();
}
var key=0;
function nextAd(){
if(adNum<count)adNum++ ;
else adNum=1;

if( key==0 ){
key=1;
} else if (document.all){
imgInit.filters.revealTrans.Transition=23;
imgInit.filters.revealTrans.apply();
playTran();
}
document.images.imgInit.src=imgUrl[adNum];
document.images.imgInit.alt=imgAlt[adNum];
document.getElementById('link'+adNum).style.background=buttonLineOn;
for (var i=1;i<=count;i++)
{
if (i!=adNum){document.getElementById('link'+i).style.background=buttonLineOff;}
}
//focustext.innerHTML=imgtext[adNum];//在图片下面显示路径
theTimer=setTimeout("nextAd()", TimeOut);
}
document.write('<a target=_self href="javascript:goUrl()"><img style="FILTER: revealTrans(duration=1,transition=5);" src="javascript:nextAd()" width='+imgWidth+' height='+imgHeight+' border=0 vspace="0" name=imgInit class="imgClass"></a><br>');
document.write('<div id="txtFrom"><span id="focustext" class="'+textStyle+'"></span></div>');
document.write('<div id="imgTitle">');
document.write(' <div id="imgTitle_down"> <a class="trans"></a>');
//数字按钮代码开始
for(var i=1;i<imgUrl.length;i++)
{
document.write('<a id="link'+i+'" href="javascript:changeimg('+i+')" class="button" style="cursor:hand; " title="'+imgAlt[i]+'" onFocus="this.blur()">'+i+'</a>');
}
//数字按钮代码结束
document.write('</div>');
document.write('</div>');
document.write('</div>');
document.write('</div>');
}
//IE结束

</script>

<script>document.getElementByName('imgInit').src=nextAd();</script>

里面重要的地方都有注释了，直接复制到你的aspx代码中即可。
注意：在<body></body>中不要<form></form>标签，直接在<div align=left>
</div>中输入上面的js代码即可。不知道为什么有form总是报imgInit错误。
4.在cs进行数据库调用：直接代码了，呵呵呵不会看不懂吧
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;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if ( !IsPostBack )
{
bind ( );
}
}
public string imgUrl=string.Empty;
public string imgtext = string.Empty;
public string imgLink = string.Empty;
public string imgAlt = string.Empty;
void bind( )
{
using ( SqlConnection connection = new SqlConnection ( @"server=./sqlexpress;database=images;uid=sa;pwd=123" ) )
{
SqlDataAdapter sda = new SqlDataAdapter ( "select top 5 * from images order by imageid desc" , connection );
DataSet ds = new DataSet ( );
DataTable dt = new DataTable ( );
sda.Fill ( ds );
dt = ds.Tables[0];
for ( int i = 0 ; i < dt.Rows.Count ; i++ )
{
imgUrl += dt.Rows[i]["imgUrl"].ToString ( ) + ",";
imgtext += dt.Rows[i]["imgText"].ToString ( ) + ",";
imgLink += dt.Rows[i]["imgLink"].ToString ( ) + ",";
imgAlt += dt.Rows[i]["imgAlt"].ToString ( ) + ",";
}
}
}

}
上次有位朋友向我要CSS代码，但是当时手边没有这个代码，所以今天有时间将CSS代码也贴上，供大家使用！
#imgTitle {
FILTER: ALPHA(opacity=70); LEFT: 0px; OVERFLOW: hidden; POSITION: relative; TEXT-ALIGN: right
}
#imgTitle_up {
LEFT: 0px; HEIGHT: 1px; TEXT-ALIGN: left
}
#imgTitle_down {
LEFT: 0px; TEXT-ALIGN: left
}
.imgClass {
BORDER-RIGHT: #fff 1px solid; BORDER-TOP: #fff 1px solid; BORDER-LEFT: #fff 1px solid; BORDER-BOTTOM: #fff 1px solid
}
#txtFrom {
VERTICAL-ALIGN: middle; PADDING-TOP: 2px; TEXT-ALIGN: center
}
.button {
PADDING-RIGHT: 7px; PADDING-LEFT: 7px; BACKGROUND: #7b7b63; PADDING-BOTTOM: 2px; MARGIN: 0px; FONT: bold 9px sans-serif; BORDER-LEFT: #fff 1px solid; PADDING-TOP: 2px; TEXT-DECORATION: none
}
A.button {
COLOR: #ffffff; FONT-FAMILY: sans-serif; BACKGROUND-COLOR: #000000; TEXT-DECORATION: none
}
A.button:link {
COLOR: #ffffff; FONT-FAMILY: sans-serif; BACKGROUND-COLOR: #000000; TEXT-DECORATION: none
}
A.button:visited {
COLOR: #ffffff; FONT-FAMILY: sans-serif; BACKGROUND-COLOR: #000000; TEXT-DECORATION: none
}
A.button:hover {
BACKGROUND: #fff; COLOR: #fff; FONT-FAMILY: sans-serif; TEXT-DECORATION: none
}
.buttonDiv {
BACKGROUND: #000000; FLOAT: left; VERTICAL-ALIGN: middle; WIDTH: 21px; HEIGHT: 1px; TEXT-ALIGN: center
}
.trans {
FILTER: progid:DXImageTransform.Microsoft.Alpha(startX=0, startY=0, finishX=100, finishY=100,style=1,opacity=0,finishOpacity=40); WIDTH: 90px; BACKGROUND-COLOR: #000
}

测试环境：vs2008SP1+Win7+IE8+SQL Seerver2008