How to trigger event in JavaScript?

Question

I have attached an event to a text box using addEventListener. It works fine. My problem arose when I wanted to trigger the event programmatically from another

Answer 1

var btn = document.getElementById('btn-test');
var event = new Event(null);

event.initEvent('beforeinstallprompt', true, true);
btn.addEventListener('beforeinstallprompt', null, false);
btn.dispatchEvent(event);

this will imediattely trigger an event 'beforeinstallprompt'