Javascript - validation, numbers only

Question

I\'m trying to get my login form to only validate if only numbers were inputted. I can it to work if the input is only digits, but when i type any characters after a number,

Answer 1

function validateNumber(e) {
            const pattern = /^[0-9]$/;

            return pattern.test(e.key )
        }

This approach doesn't lock numlock numbers, arrows, home, end buttons and etc