Submit form via ajax to server and check if there were any errors

Question

Any experienced full stack web developer here? I need some help regarding validating a form via javascript and then submitting it on server.

What i am trying to do is validate a form via javascript, if form is validated, i send this form to server via ajax. If server sends any error, i call a javascript function to display that error message.

This didn't work for me and on top of that someone informed me that this isn't a safe way to do it.

I asked a question on stackoverflow (https://stackoverflow.com/questions/50348267/check-if-form-has-been-submitted-via-ajax-in-php) but i haven't gotten a solution yet. Can someone please guide me on this.

Please refer to link to my question on stackoverflow for more context.

Question is HOW CAN I achieve what i am trying to do and in a secure way ?

Answer 1

may this help you:
https://code.sololearn.com/W29OZ1H63Kq6/?ref=app

Answer 2

i don't know how this can help me as it is hard for me to understand this code. Can you please explain a bit in context to my problem