JSFiddle - React, Tailwind, and code Playground

HTML

<div id="field"><div class="field-item">someText</div>
   </div>
    <div id="somediv" style="border:3px double red"></div>

JavaScript

$( document ).ready(function() {
    console.log( "ready!" );
    if ($('div.field-item:contains("someText")').length > 0) {
$('div.somediv').addClass("thisClass").text("someText was there");
  }
});