JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.13/jquery-ui.js"></script>
<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.10/themes/base/jquery-ui.css">
<div class="window">Hello</div>
<div class="window">Hello again</div>

JavaScript

$(function () {
  $(".window").dialog({
      focus: function (event, ui) {
        //alert('focus');
        $(".ui-dialog")
          .find(".ui-dialog-titlebar")
          .removeClass("ui-state-error");
        $(this).parents(".ui-dialog:first")
          .find(".ui-dialog-titlebar")
          .addClass("ui-state-error");
      }
  });
});