Can I validate a HTML input without using JS and HTML5?

Question

I am creating a site for legacy mobile browsers (e.g.: browsers running on Nokia 2760), and cannot, of course, use JS nor HTML5. Is there any way to restrict user's input to prevent them to send letters in a numeric field? Or the best I can do is to execute a server-side validation?

Thanks!

Edit: I would like to have both client and server-side validation, not only the server-side one. It is desirable for me to restrict user's input, just like an <input type="numeric" /> does. Tyiping several numbers in a old cellphone without that feature is painful.

The doctype I am using is

<!DOCTYPE html PUBLIC “-//W3C//DTD XHTML Basic 1.0//EN” “http://www.w3.org/TR/xhtml-basic/xhtml-basic10.dtd”>

You should always have server-side validation anyway... If anyone disables JavaScript on their browser, your validation goes out the window. — Ted
– Ted, Commented Sep 19, 2016 at 12:14

Quentin · Accepted Answer · 2016-09-19 12:26:46Z

1

Server side if your only option here.

JavaScript and the new features introduced in HTML 5 are the only client side options, and you've ruled them out.

answered Sep 19, 2016 at 12:26

Quentin

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