JSFiddle - React, Tailwind, and code Playground

HTML

<div class="modal-header">
  <h2 class="tc_pageheader editableName" id="DetailsHeader"></h2>
</div>

JavaScript

$(document).ready(function(){
    var h2 = $(".modal-header > h2").attr("id");
    if ($("#" + h2).text() == "")
      $("#" + h2).html("You are no more empty!");
});