Check file size before upload?

anton-io! · #1 Dec 22nd 2004, 12:06 am

Looking for a client side script that will check the file size of a user selected file (i.e., image) before it is uploaded to the server.

Possible in Javascript?

Looking for a Javascript/PHP solution or a simple PHP solution if possible.

Thanks greatly!

nevetS · #2 Dec 23rd 2004, 12:22 am

php is all server side scripting, so you are out of luck in that regard. Somebody correct me if I'm wrong, but there is no way to check a file size in php prior to upload. You can set a parameter in your php.ini file that I believe is MAX_UPLOAD or MAX_FILE_UPLOAD to 1 megabyte or another arbitrary number if you want. If someone tried to upload a larger file, they would get an error.

On the javascript/vbscript side, I believe that you are looking for information that is not available via those scripting languages either.

Your only option would be java if you wanted to check something client side.

I could be wrong, though. It's happened before (twice)

.

dustin · #3 Dec 23rd 2004, 1:56 am

Java applets have a pretty strict security policy in place. It prevents them from doing nasty things to the computers of people who view them. So I'm not sure if they would be able to check an image's size.

relaxzoolander · #4 Jan 15th 2005, 5:50 pm

i use an asp script that checks file size.
.

phrozen_ra · #5 Jan 18th 2005, 1:26 am

http://ro.php.net/features.file-upload

with PHP and it's not that difficult... if you still don't understand i'll help you

RussellMD · #6 Apr 10th 2008, 8:32 am

Hi!

You can use a server-side solution.

Use $_SERVER['CONTENT_LENGTH'] after trying to upload file. This variable returns size of uploaded file, even if upload failed

if(isset($_SERVER['CONTENT_LENGTH']) && $_SERVER['CONTENT_LENGTH']>2097152)
$error = 'Upload FAILED, file is too large !';

This method work fine for all cases of errors when upload file , even if filesize is greater than MAX_FILE_SIZE, upload_max_filesize or post_max_size (from php.ini)

Good Luck! && Sorry for my bad english.

dineshw · #7 Apr 11th 2008, 9:02 pm

RussellMD,

Wont that only check the file size AFTER the file has already been uploaded to the temporary folder? Doesnt that defeat the purpose?

Dinesh

yangyang · #8 Jan 1st 2009, 3:58 am

JavaScript is not able to do it, it's forbidden to access file system.

However with VBScript on ActiveX object, you can check for file size with client side scripting. Hope the code below helps:

html4strict Code:

<head><script>
function A()
{
var oas = new ActiveXObject("Scripting.FileSystemObject");
var d = document.a.b.value;
var e = oas.getFile(d);
var f = e.size;
alert(f + " bytes");
}

</script>
</head>
<body>
<form name="a">
<input type="file" name="b">
<input type="button" name="c" value="SIZE" onClick="A();">
</form>
</body>
</html>

dimitar christoff · #9 Jan 1st 2009, 1:15 pm

activex / vbscript is not cross browser and reliant on security limitations.
checking server side is daft - if you have a limit of say, 5mb and somebody uploads a 5.2 mb file, it means waiting for the whole upload to complete so that php/asp can say 'too big, try again'.

http://digitarald.de/project/fancyupload/
uses mootools and a really tiny flash control - check the demos. achieves desired check and much more, including progress report, multiple uploads etc. flash is likely to be installed for at least 90% of your visitors and the solution is semantic anyway - uses a normal form upload which can work via POST if flash is not there.

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