Hepl for very beginner for remote validation

Hepl for very beginner for remote validation

Hello everyone , I recently found jQuery . I am beginner , very beginner

I learned to use jQuery validation for input form , but I can not run remote validation .

I need to check if a file exists in a directory, before the file is uploading by the user


Can you suggest the very simple code to learn the basics of this validaton method?

I found many files in the net , but they are very difficult to understand for a beginner.

Thank you in advance

Roberto