JSFiddle - React, Tailwind, and code Playground

HTML

<input type='text' id='btn' />

JavaScript

$('#btn').keypress(TriggeredKey);

function TriggeredKey(e) {
   e = e || window.event;
   var keycode;
   if (window.event){
     keycode = e.which ? window.event.which : window.event.keyCode;
   }
   alert(e.which);
}