How String.fromCharCode function is used in html input fields with mobile keyboard

Question

I want to capture the keyboard key codes and convert them into characters. I am using String.fromCharCode javascript function but it only works with computer keyboard and not with mobile keyboard. Any help would be greatly appreciated.

$(".inputsmeter").keyup(function (e) {
  let key = e.which;
  let c = String.fromCharCode(key);
  alert(c);
});

Answer 1

const inputElem = document.getElementById('input')
inputElem.addEventListener('input', (ev) => { 
  console.log(ev);
  alert(`e.data: ${ev.data}`);
});

<input id="input" type="text" placeholder="type something... " />

This works as expected on my iOS Safari 15. Type a in the input and you will see the warning printed:

ev.data: a