JSFiddle - React, Tailwind, and code Playground

HTML

<div class="item">
  <div class="hidden">12</div>
  <input type="submit" class="btnAddCommentForAnswer" value="Add Comment" />
</div>

<div class="item">
  <div class="hidden">44</div>
  <input type="submit" class="btnAddCommentForAnswer" value="Add Comment" />
</div>

JavaScript

$(document).ready(function() {
    $('.btnAddCommentForAnswer').click(function() {
        alert($(this).siblings('.hidden').text());
    });
});