JSFiddle - React, Tailwind, and code Playground

HTML

<div class="editableMCE" id="cms.xml_1_content">
    <form method="post">
        <fieldset>
            <textarea id="cms.xml_1_contentEditor">foo</textarea>
        </fieldset>
    </form>
</div>
<a href="javascript:" class="1">TEST 1</a>
<a href="javascript:" class="2">TEST 2</a>

JavaScript

$('a.1').bind('click',function() { 
    $('div').find('textarea').val('bar');
});

$('a.2').bind('click',function() { 
    $('div').children('form').find('textarea').val('works!');
});