upload validation

nuttynibbles

hi everyone, im doing a upload function. okay i know there are a lot of examples n tutorials online. but i could not find a solution to do a upload file validation on client side.. apparently it can only be done on the server side. however, i've tested my program and if i were to upload a file that is of a bigger size, it will take quite sometime b4 it prompts me the errors message. i was thinking if there was a way to speed up this validation as im afraid it will lag the server. be it file size, file type..

tks 🙂

bradgrafelman

I don't know of any myself, but what I can say is that you won't find a simple Javascript solution. File uploads are somewhat of a concern from a security standpoint, so the common browsers today prohibit client-side scripting languages such as Javascript or even HTML from easily tampering with file upload fields.

What you might find is some Java applet that first analyzes the file before it uploads to your server.

lazzerous

PHP is a server-side language, meaning all processing is done on the server, not the client.
Being as such, there isn't anything you can do from a PHP standpoint to validate the file before it is uploaded. You could, however, use a java or flash application to at least give the user some sort of visual for the upload process.

ActiveX would allow you to validate the file client-side, but your visitors would most likely be restricted to using Internet Explorer, and who wants that forced upon them?

Users are inherently stupid. You can do everything in your power to make sure they can't screw up, but ultimately, they'll find a way. If they try to upload a 500MB movie file where your form specified a PDF file only (example), let them wait - it's their own damn fault.