利用Javascript 與 VBscript 在asp中實現圖片自動切換

來源:互聯網
上載者:User

一、原理說明:
1、利用Javascript構造一個HTTP請求向後台資料庫請求圖片路徑和圖片描述資料
2、利用返回的圖片資料構造一個圖片路徑數組和圖片描述數組
3、構造一個IMG對象
4、利用javascript的定時函數控制IMG對象的SRC屬性和TITLE屬性在圖片路徑數組和圖片描述數組各元素之間切換
二、檔案組成:
frontpage.asp
loadpicturesource.asp
conn.asp
site.MDB
三、詳細設計:
1、用戶端請求調用frontpage.asp: Http - > frontpage.asp
2、frontpage.asp調用loadpicturesource.asp擷取圖片資料:frontpage.asp - > loadpicturesource.asp
3、loadpicturesource.asp調用site.MDB擷取資料存放區:loadpicturesource.asp - > site.MDB
4、frontpage.asp利用調用返回資料構造圖片路徑數組和圖片描述數組
5、frontpage.asp啟動setInterval定時函數進行自動控制
四、檔案內容:
============================================================================
frontpage.asp
============================================================================
<!--#include file="conn.asp"-->
<%
    dim rs,sSql,sOutput,defaultPicture,defaultDescription,interval
 '重新整理頻率
    interval =5000
 '預設圖片和預設說明 
 set rs=server.CreateObject("ADODB.RecordSet")
 sSql = "select top 1 * from pictureSet where PicName = '首頁圖片' order by updateDate desc"
    rs.open sSql,conn,1,1
    if not rs.bof and not rs.eof then 
 
  defaultPicture = rs("PicPath")
  defaultDescription = rs("PicTiTle")
 End If
 rs.close
 conn.close
 Set rs = Nothing
 Set conn = Nothing
 defaultDescription = "圖片新聞:"&defaultDescription&"(點擊圖片查看放大效果)"
 
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE></TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
<SCRIPT LANGUAGE="JavaScript">
<!--
var arraySrc;
var arrayAlt;
var picNameCounter = 0;
function GetServerData(objstrName,objstrValue,serverPage)
{
 string=escape(objstrName) +"="+escape(objstrValue);
 var objXMLHTTP = null; 
 try 
 { 
  objXMLHTTP = new ActiveXObject("MSXML2.XMLHTTP"); 
 } 
 catch(e) 
 { 
  try 
  { 
   objXMLHTTP = new ActiveXObject("Microsoft.XMLHTTP"); 
  } 
  catch(e2){}
 }
 objXMLHTTP.open("POST", serverPage, false);
 objXMLHTTP.setrequestheader("content-length",string.length);
 objXMLHTTP.setrequestheader("content-type","application/x-www-form-urlencoded");
 objXMLHTTP.send(string);
 return objXMLHTTP.responseText; 
}
function Initialize()
{
 var returnSrc = GetServerData("PictureSrc","PictureSrc","LoadDisplayPicture.asp"); 
 arraySrc= returnSrc.split("|");
 var returnAlt = GetServerData("PictureAlt","PictureAlt","LoadDisplayPicture.asp");
 arrayAlt = returnAlt.split("|");
 setInterval("PictureLoad()",<%=interval%>);
}
function PictureLoad()
{
 document.all('mainpic').src = arraySrc[picNameCounter].toString();
 document.all('mainpic').title = arrayAlt[picNameCounter].toString();
 document.all('pictureDescption').innerText = "圖片新聞:" + arrayAlt[picNameCounter].toString() + "(點擊圖片查看放大效果)"; 
 picNameCounter = picNameCounter + 1;
 if (picNameCounter > 9 ||picNameCounter > arraySrc.length -  1)
 {
  picNameCounter = 0;
 }

}
function showFull()
{
 var newWin = window.open();
 newWin.document.write("<img src="+ newWin.opener.mainpic.src +" title="+ newWin.opener.mainpic.title +" width=100% height = 100%>");
 newWin.document.close();
}
//-->
</SCRIPT>
</HEAD>
<BODY>
<table width="100%" height="224" border="0" cellpadding="0" cellspacing="0">
   <tr>
  <td height="0.5px" colspan="3" bgcolor=<%=bgColor%>>&nbsp;</td>
   </tr>
   <tr>
     <td height="6" bordercolor="#000000" >
    <!------------------圖片切換部分------------------>
    <img name = "mainpic" src = <%=defaultPicture%> width = "280" height="186" onclick = "showFull();" title=<%=defaultDescription%>>
  <td width="1%" bgcolor=<%=bgColor%>></td>  
  <td width="65%" bordercolor="#000000" bgcolor = "#FFFFFF">
    <!------------------文字新聞部分------------------>
    <script language="javascript" src="owen.asp?n=7"></script>
  </td>                  
   </tr>
       <tr>
  <td colspan="3">
            <table>
   <tr>
    <td align="left" width = 88%><font size = 2px><a name = "pictureDescption" ><%=defaultDescription%></a></font></td>
    <td align="right"><a href = "default_all.asp" target = "_blank"><font size = 2px>更多新聞...</font></a></td>
   </tr>
            </table>
   
        </td>
      </tr>
   <tr>
  <td height="0.5px" colspan="3" bgcolor=<%=bgColor%>>&nbsp;</td>
   </tr>                
</table>
<script language = javascript>Initialize();</script>
</BODY>
</HTML>
============================================================================
loadpicturesource.asp
============================================================================
<!--#include file="conn.asp"-->
<%
Response.CharSet = "gb2312"
Dim PictureSrc,PictureAlt,returnValue
PictureSrc = request("PictureSrc")
PictureAlt = request("PictureAlt")
If PictureSrc <> "" Then
    '載入圖片地址
 set rs=server.createobject("adodb.recordset")
 rs.open "select * from PictureSet where picName='首頁圖片' order by updateDate desc",conn,3,3
 for i=1 to rs.recordcount
  if i=1 then
   returnValue=rs("PicPath")
  else
   returnValue=returnValue&"|"&rs("PicPath")
  end if
 rs.movenext
 Next
Elseif PictureAlt <> "" Then
    '載入圖片描述
 set rs=server.createobject("adodb.recordset")
 rs.open "select * from PictureSet where picName='首頁圖片' order by updateDate desc",conn,3,3
 for i=1 to rs.recordcount
  if i=1 then
   returnValue=rs("PicTitle")
  else
   returnValue=returnValue&"|"&rs("PicTitle")
  end if
 rs.movenext
 Next
End If
rs.close
conn.close
Set rs = Nothing
Set conn = nothing
response.write returnValue
%>
============================================================================
conn.asp
============================================================================
<%
dim conn,connstr
connstr="Provider=Microsoft.Jet.OLEDB.4.0;Data Source="&server.mappath(".")&"/site.MDB;Persist Security Info=False"
Set conn=Server.CreateObject("ADODB.CONNECTION")
conn.open connstr
%>
============================================================================
site.MDB
============================================================================
create table PictureSet
(
  id int identity,
  picName varchar(20),
  picPath varchar(50),
  picTitle varchar(50),
  updateDate datetime
)
insert into PictureSet(picName,picPath,picTitle,updateDate) values('首頁圖片','./pictureSource/autoDisplay_1.jpg','圖片說明','2006-06-17')
insert into PictureSet(picName,picPath,picTitle,updateDate) values('首頁圖片','./pictureSource/autoDisplay_2.jpg','圖片說明','2006-06-17')
insert into PictureSet(picName,picPath,picTitle,updateDate) values('首頁圖片','./pictureSource/autoDisplay_3.jpg','圖片說明','2006-06-17')
insert into PictureSet(picName,picPath,picTitle,updateDate) values('首頁圖片','./pictureSource/autoDisplay_4.jpg','圖片說明','2006-06-17')
insert into PictureSet(picName,picPath,picTitle,updateDate) values('首頁圖片','./pictureSource/autoDisplay_5.jpg','圖片說明','2006-06-17')

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