JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://tinymce.cachefly.net/4.0/tinymce.min.js"></script>
<script src="http://tinymce.cachefly.net/4.0/jquery.tinymce.min.js"></script>
<div id="dialog">
    <textarea id="txaTitle"></textarea>
</div>
<button id="btnInsert">Insert 'qwer'</button>

JavaScript

$('#dialog').dialog();
tinymce.init({
    selector: '#txaTitle'
});
var editor = $($('#txaTitle').tinymce().getBody()).children(':first-child');

$('#btnInsert').button().on('click', function() {
    $('#txaTitle').tinymce().execCommand('mceInsertContent', false, 'qwer');
});