jquery
/*
*
* Function to validate File size
*
**/
function findSize(field_id)
{
var fileInput = $("#"+field_id)[0];
byteSize = fileInput.files[0].fileSize;
return ( Math.ceil(byteSize / 1024) ); // Size returned in KB.
}
復制代碼
再把我以前用的js驗證上傳文件大小的代碼也放上吧，有需要的選擇參考。
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta name="DEscription" contect="my code demo" />
<meta name="Author" contect="Michael@www.micmiu.com" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
</head>
<body>
<img id="tempimg" dynsrc="" src="" />
<input type="file" name="file" id="fileuploade" size="40" />
<input type="button" name ="check" value="checkfilesize" onclick="checkfile()"/>
</body>
<script type="text/javascript">
var maxsize = 2*1024*1024;//2M
var errMsg = "上傳的附件文件不能超過2M?。?！";
var tipMsg = "您的瀏覽器暫不支持計算上傳文件的大小，確保上傳文件不要超過2M，建議使用IE、FireFox、Chrome瀏覽器。";
var browserCfg = {};
var ua = window.navigator.userAgent;
if (ua.indexOf("MSIE")>=1){
browserCfg.ie = true;
}else if(ua.indexOf("Firefox")>=1){
browserCfg.firefox = true;
}else if(ua.indexOf("Chrome")>=1){
browserCfg.chrome = true;
}
function checkfile(){
try{
var obj_file = document.getElementById("fileuploade");
if(obj_file.value==""){
alert("請先選擇上傳文件");
return;
}
var filesize = 0;
if(browserCfg.firefox || browserCfg.chrome ){
filesize = obj_file.files[0].size;
}else if(browserCfg.ie){
var obj_img = document.getElementById('tempimg');
obj_img.dynsrc=obj_file.value;
filesize = obj_img.fileSize;
}else{
alert(tipMsg);
return;
}
if(filesize==-1){
alert(tipMsg);
return;
}else if(filesize>maxsize){
alert(errMsg);
return;
}else{
alert("文件大小符合要求");
return;
}
}catch(e){
alert(e);
}
}
</script>
</html>
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