JSFiddle - React, Tailwind, and code Playground

HTML

<form id="edit-example">
    <textarea class="text-edit1" rows="3" placeholder="Message"></textarea>
</form>

CSS

.active-text {
	background-color:#FFFAB9;
}

JavaScript

$(function(){
 if($.trim($('.text-edit1').val()).length){
     $(this).addClass('active-text');
});
});