JSFiddle - React, Tailwind, and code Playground

HTML

<textarea></textarea>

JavaScript

$(document).ready(function(){
$('textarea').on('keypress', function(e) {
    var val = $('textarea').val();
    if (e.which == 13) {
if(! /\S/.test(val)) {
   alert("no data");
}
    }
});
});