JSFiddle - React, Tailwind, and code Playground

HTML

<textarea name = "facilityNotes" id= "facilityNotes"  rows= "3" ></textarea>
                                    <span id="res"></span>

JavaScript

var my_id = 'facilityNotes';
            window.onload = function() {
                var my_id = 'facilityNotes';
                document.getElementById(my_id).onkeyup = function(e) {// Listener for key pressing in the field.
                    var res = 'unchanged';
                    if (this.oldValue !== this.value) {
                        this.oldValue = this.value;
                        res = 'changed';
                    }
                    alert(res);
                    document.getElementById('res').innerHTML = res;
                };
            }