How to restrict the uploaded file size in javascript?

[anil2083]

I have a problem in javascript. I want to get size of uploaded file by fileupload control in asp.net.
I have googled a lot but i didn't get satisfactory answer. Do anybody know how to do this with the help of javascript .
if any body have idea please tell me how can i get the size so that i can restrict the user to not upload file more than particular size.
i am waiting your reply very eagerily.

[Frinavale]

As far as I know you cannot check the file size using JavaScript because of security restrictions implemented by the Browser.

I've moved this to the JavaScript forum where the experts will be able to answer this question better.

-Frinny

[anil2083]

ok..thanks

[acoder]

Yes, that's correct. You can't check it cross-browser.

I would suggest that you check the file size on the server-side and discard the file if it's too large.

[Frinavale]

The problem with this acoder is that sometimes the file is too large for the browser to handle. I have had problems (testing this) in the past and would love the ability to check the file size before uploading....but at the same time I understand why browsers should not be allowed to access files being uploaded.

[acoder]

There is something in PHP which allows you to specify the maximum file size on the client-side using HTML. Other languages may have something similar.

[Frinavale]

If it's HTML that specifies the size then you should be able to implement it in any web-based application. I'll look into it later :)

Thanks

[acoder]

Not quite ;)

It's a hidden field which means absolutely nothing except to PHP code which would use it if found. It's named MAX_FILE_SIZE and is a convenience feature only.