JSFiddle - React, Tailwind, and code Playground

HTML

<textarea name="post" id="post-input" autocomplete="off"></textarea>

JavaScript

var input = jQuery("#post-input");

input.on('keyup keydown copy' , function(event){
    console.log("Code: " + event.keyCode);
    console.log("Code: " + event.which);
    console.log("Code: " + window.event ? event.keyCode : event.which);
});