Pure Javascript listen to input value change

Question

Is there any way I can create a constant function that listens to an input, so when that input value changes, something is triggered immediately?

I am looking for so

Answer 1

Default usage

el.addEventListener('input', function () {
    fn();
});

But, if you want to fire event when you change inputs value manualy via JS you should use custom event(any name, like 'myEvent' \ 'ev' etc.) IF you need to listen forms 'change' or 'input' event and you change inputs value via JS - you can name your custom event 'change' \ 'input' and it will work too.

var event = new Event('input');
el.addEventListener('input', function () { 
  fn();
});
form.addEventListener('input', function () { 
  anotherFn();
});


el.value = 'something';
el.dispatchEvent(input);

https://developer.mozilla.org/en-US/docs/Web/Guide/Events/Creating_and_triggering_events