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

3.写js代码：（不知道为什么放在一个单独的js文件不行）

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>');

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>');

}

//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

posted on 2008-01-31 10:21 腾云驾雾阅读(1798) 评论(1) 收藏举报

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