求助判断文件格式问题
现在的代码的效果是,选中文件,如果文件类型不正确,重新刷新该页.我想实现这样的效果,该怎么改?input file 浏览选中文件,类型不正确,将该input file框自动清零,而其他input file不变.谢谢!
<html>
<head>
<title>文件传送</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<style type="text/css">
<!--
td { font-size: 9pt}
a { color: #000000; text-decoration: none}
a:hover { text-decoration: underline}
.tx { height: 16px; width: 30px; border-color: black black #000000; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 1px; border-left-width: 0px; font-size: 9pt; background-color: #eeeeee; color: #0000FF}
.bt { font-size: 9pt; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; height: 16px; width: 80px; background-color: #eeeeee; cursor: hand}
.tx1 { height: 20px; width: 30px; font-size: 9pt; border: 1px solid; border-color: black black #000000; color: #0000FF}
.STYLE6 {color: #FF0000}
.STYLE8 {font-size: 12px}
-->
</style>
</head>
<body>
<script language="javascript">
function GetFilePath(obj)
{
//alert(obj);
var physical = document.getElementById(obj).value;
var length = physical.length;
var charindex = physical.lastIndexOf(".");
var ExtentName = physical.substr(charindex,5)
var vExtentName = ExtentName.toLowerCase(ExtentName) //* 将扩展名转换成小写
//*上传允许的文件类型
if(!(vExtentName == ".txt" || vExtentName == ".ps" || vExtentName == ".rar" || vExtentName == ".zip" || vExtentName == ".doc" ))
{
alert("文件类型不正确："+vExtentName+"");
window.location.href = "index.htm";
return false;
}
}
</script>
<form name="myform" method="post" action="Example_Progress.asp" enctype="multipart/form-data" target="upload">
<table border="1" cellspacing="0" cellpadding="0" bordercolorlight="#000000" bordercolordark="#CCCCCC" width="91" height="23">
<tr>
<td align="left" valign="middle" height="18" width="18"> </td>
<td bgcolor="#FFCC00" align="left" valign="middle" height="18" width="67"> 节目表传送</td>
</tr>
</table>
<br>
<table width="680" border="1" align="center" cellpadding="5" cellspacing="0" bordercolor="#000000" bordercolorlight="#000000" bordercolordark="#CCCCCC">
<tr bgcolor="#CCCCCC">
<td height="22" align="left" valign="middle" bgcolor="#FFFFCC"> <strong>节目表传送专用通道(<span class="STYLE6">合作愉快,谢谢支持!</span>) </strong></td>
</tr>
<tr align="left" valign="middle" bgcolor="#eeeeee">
<td bgcolor="#eeeeee" height="42">
<script language="javascript">
function setid()
{
str='<br>';
if(!window.myform.upcount.value)
window.myform.upcount.value=2;
for(i=1;i<=window.myform.upcount.value;i++)
str+='文件'+i+':<input id="file'+i+'" type="file" name="filefield'+i+'" style="width:400" class="tx1" value="" onchange=GetFilePath("file'+i+'")><br><br>';
window.upid.innerHTML=str+'<br>';
}
</script>
<li> 需要传送的文件个数
<input type="text" name="upcount" class="tx" value="2">
<input type="button" name="Button" class="bt" onClick="setid();" value="· 设定 ·">
</li>
<br> </td>
</tr>
<tr align="center" valign="middle">
<td align="left" id="upid" height="116"> <input id=File type="file" name="filefield1" value="" onchange=GetFilePath("File")> </td>
<tr align="center" valign="middle" bgcolor="#eeeeee"><td bgcolor="#eeeeee" height="24">
<input type="button" value="· 提交 ·" class="bt" onClick="UploadData()">
<input type="reset" name="Submit2" value="· 重执 ·" class="bt"></td>
</tr>
</table>
</form>
<br>
</body>
</html>
<script language="javascript">
setid();
</script>
