JSFiddle - React, Tailwind, and code Playground

by infatti

HTML

<div>
    <textarea></textarea>
    <textarea></textarea>
    <a href="#" class="add">add</a>
</div>

<div>
    <textarea></textarea>
    <textarea></textarea>
</div>

JavaScript

$('.add').click(function(){
    $(this).closest('div').next('div').find('textarea:visible:first').focus();
});