JSFiddle - React, Tailwind, and code Playground

HTML

<form class="follow-form" method="post" action="listen.php">
    <input name="followID" value="123456" type="hidden">
    <button type="submit" value="Actions" class="btn follow" title="123456">
        <i></i><span>follow</span>
    </button>
</form>

JavaScript

jQuery(function($) { 
    $("form.follow-form").submit(function(e) { 
        e.preventDefault();
        
        $(this).find('i').addClass('active'); 
        
        $.post('/ajax_html_echo/', {
            followID: $(this).find('input').val()
        }, function() { 
            $(e.currentTarget).find('button').hide().after('<span class="following">Following!</span>');
        });
    });
});