block input?

Question

JavaScript

Good afternoon, not very selenium can anyone help. There is a user page, when he entered information in the input and clicked save, then the input should be blocked. According to the idea, if the input is filled, then the blocking, if empty, then you can enter data.

Answer 1

HTML

<form>
  <input required>
  <button>Сохранить</button>
</form>

JavaScript

const form = document.querySelector('form');
const input = form.querySelector('input');

form.addEventListener('submit', (event) => {
  event.preventDefault();
  input.disabled = true;
});

https://jsfiddle.net/br2uLj6t/