用JavaScript限制圖片上傳長寬

來源:互聯網
上載者:User
javascript|上傳

<html>
<head>
<title>Upload Image</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
</head>
<body bgcolor="#FFFFFF" text="#000000">
<form name="IUpload" action="upfile.asp" method="post">
<p><input type="file" name="picsrc" size="40" >
<input type="button" value="上傳" ></p></form>
<p><img name="picshow" src="/UploadPic/2007-7/200777173713509.jpg" title="映像預覽"></p>
</body>
</html>

<SCRIPT LANGUAGE="JavaScript">
<!--
function imgExceedSize(w,h){
if(!document.IUpload.picsrc.value==""){
if(picshow.width>w||picshow.height>h){
alert("映像尺寸:"+picshow.width+"X"+picshow.height+"。\\映像尺寸過大!你只能上傳尺寸為 "+w+"×"+h+"的映像,請重新瀏覽圖片!");
return true;
}else{
return false;
}
}else{
return true;
}
}

function detect(){
var ok=imgExceedSize(50,50);
if(ok){
document.IUpload.reset();
}else{
document.IUpload.submit();
}
}

//-->
</SCRIPT>



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