JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text">

CSS

.test{
    border: 2px red solid;
}

JavaScript

$('input').keyup(function(event) {
  var value = $(this).val();
  if (value) {
    $(this).addClass('test');
  } else{
    $(this).removeClass('test');
  }
});