用XML+FSO+JS实现服务器端文件的

首先在服务器端先创建一个程序可以生成XML文件，以返回客户端，（getfolder.asp）
<%
'written by Linzhang Chen ,2003-4-20
' 转载请注明出处和保留此版权信息
response.write "<?xml version=""1.0"" encoding=""GB2312""?>"&chr(13)
response.write "<mediafile>"&chr(13)
folders=request("folder")
if folders="/" then
folders=""
end if
dim count
count=0
folders=replace(folders,"..","")
basefolder="../media/"'基准的文件夹路径
newfolder=basefolder&folders
Set fso =server.CreateObject("Scripting.FileSystemObject")
set f=fso.getfolder(server.mappath(newfolder))
set sf=f.subfolders
for each fd in sf'返回指定路径下面的文件夹列表
response.write "<file>"&chr(13)
response.write "<ftype>folder</ftype>"&chr(13)
response.write "<fname>"&fd.name&"</fname>"&chr(13)
response.write "</file>"&chr(13)
count=count+1
next
set sf=nothing
set ff=f.Files
for each fi in ff
fname=fi.name
if instr("asf,wma,wmv",lcase(mid(fname,instrrev(fname,".")+1)))>0 then'设定允许返回的文件类型，防止源码泄露
response.write "<file>"&chr(13)
response.write "<ftype>file</ftype>"&chr(13)
response.write "<fname>"&fname&"</fname>"&chr(13)
response.write "</file>"&chr(13)
count=count+1
end if
next
'如果该目录下没有文件，就发一个空元素
if count=0 then
response.write "<file>"&chr(13)
response.write "<ftype>empty</ftype>"&chr(13)
response.write "<fname>0</fname>"&chr(13)
response.write "</file>"&chr(13)
end if
response.write "</mediafile>"
set ff=nothing
set f=nothing
set fso=nothing
%>
下面就是客户端的JS的功夫了(selectfile.asp)
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> 选择视频文件 </TITLE>
<style>
td{font-size:9pt}
select{width:210}
.s2{width:250}
</style>
<SCRIPT LANGUAGE="javascript">

</SCRIPT>
<script LANGUAGE="vbscript">
function checkfolder(folderstr)
if (folderstr="" or instr(folderstr,"/")=instrrev(folderstr,"/")) then
checkfolder=""
else
nfolder=left(folderstr,len(folderstr)-1)
checkfolder=left(nfolder,instrrev(nfolder,"/"))
end if
end function
</script>
</HEAD>

<BODY style="margin:0" bgColor=menu onload="javascript:userlist('',0)">
<table width="443" border="0" cellspacing="0">
<tr>
<td height="36"><table width="409" border="0">
<tr>
<td width="73" align="right">查找范围(<u>I</u>):</td>
<td width="214"><select name="select" id="select" size="1" onchange="javascript:userlist(this.value,1);">
</select></td>
<td width="22" valign="baseline" id="arrow" align=right></td>
<td width="20" valign="middle" id="folderid"></td>
<td width="20" align="left"><img src="images/md.gif" width="16" height="15"></td>
<td width="28" align="left"><img src="images/viewtype.gif" width="23" height="14"></td>
</tr>
</table></td>
</tr>
<tr>
<td height="120"><table width="100%" height="100%" border="0">
<tr>
<td width="9"> </td>
<td >
<iframe src="blank.htm" width=415 height=120 id="filebox"></iframe></td>
<td width="13"> </td>
</tr>
</table></td>
</tr>
<tr>
<td height="60"><table width="100%" border="0">
<FORM METHOD=POST ACTION="" name="f1">
<input type="hidden" name="folder" value="">
<tr>
<td width="85" align="right">文件名(<u>N</u>): </td>
<td width="254"><input type="text" id="filename" size="34"></td>
<td><button onclick="javascript:return check()"> 打开(<u>O</U>)</button></td>
</tr>
</FORM>
<tr>
<td align="right">文件类型(<u>T</u>):</td>
<td><select name="select2" class=s2>
<option>流媒体文件(*.asf,*.wmv,*.wma)</option>
</select></td>
<td><input type="button" name="Submit" value=" 取消 " onclick="window.close();"></td>
</tr>
</table></td>
</tr>
</table>
</BODY>
</HTML>

里面还有一个小文件blank.htm用来定义文件和文件夹显示的样式
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<style>
td{font-size:9pt}
body{font-size:9pt}
.file A{COLOR: #000000; TEXT-DECORATION: none;font-size:9pt}
.file A:visited{COLOR: #000000; TEXT-DECORATION: none;font-size:9pt}
.file A:hover {COLOR: #000000; TEXT-DECORATION: none;font-size:9pt}
</style>
</HEAD>

<BODY style="margin: 0pt">

</BODY>
</HTML>
调用的时候用以下函数，就可以实现以假乱真的服务器端选择文件的效果
function selectfile()
{
var arr = showModalDialog("selectfile.asp?temp="+Math.random(), "", "dialogWidth:453px; dialogHeight:252px; status:0;help:1");
if (arr != null)
{
return arr
}
}