How to validate html file without javascript?

Question

If the browser disabled the javascript , then how to validate the html file ? I am not talking about 'how to enable javascript, but how to validate the html form without using javascript ? This question is asked by an interviewer.

Answer 1

Form validation must always be performed server-side. Client side validation is great, but optional. Surely this is what the interviewer was looking for.

Answer 2

You can refer one of the example from How to validate html for input without using javascript .

Javascript is the only way to validate the data on the client side before it is submitted. Since Javascript can be disabled, your server-side code should always validate any submitted data before using it.

Answer 3

Not sure what 'validate' means in that context (might be a good chance for you to ask a follow up question on what he/she means on html validation?)

Anyway, I am assuming that they are talking about HTML markup validation then there are online services like:

• http://validator.w3.org/

If the interviewer is talking about validation in terms of client-side validation (eg user age must contain range between X to Yetc), then you might need to validate the input on the server (eg with server side code).