Keyboard events fire when users press keys. keydown fires when pressed, keyup when released.
input.addEventListener("keydown", (e) => {
console.log(e.key); // "a", "Enter", "Escape"
console.log(e.code); // "KeyA", "Enter", "Escape"
if (e.key === "Enter") {
submitForm();
}
});
Use e.key for the character, e.code for the physical key.