JSFiddle - React, Tailwind, and code Playground

HTML

<textarea id="textarea"></textarea>

JavaScript

var oldVal = "";
$("#textarea").on("change keyup paste", function() {
    var currentVal = $(this).val();
    if(currentVal == oldVal) {
        return; //check to prevent multiple simultaneous triggers
    }
    
    oldVal = currentVal;
    //action to be performed on textarea changed
    alert("changed!");
});