JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://bainternet-js-cdn.googlecode.com/svn/trunk/js/jQuery%20BlockUI%20Plugin/2.39/jquery.blockUI.js"></script>
<div id="res"></div>

JavaScript

$.ajax({
    url: 'http://fiddle.jshell.net',
    async: true,
    beforeSend: function(xhr) {
        console.log('antes');
        $.blockUI({
            message: '<p style="font-weight: bolder;">Aguarde!!!<br/><br/><a onclick="$.unblockUI();">Fechar</a></p>',
            timeout: 5000,
            onOverlayClick: $.unblockUI
        });
    }
}).done(function() {
    $.unblockUI();
    $.blockUI({
        message: '<p style="font-weight: bolder;">Sucesso!!!<br/><br/><a onclick="$.unblockUI();">Fechar</a></p>',
        timeout: 5000,
        onOverlayClick: $.unblockUI
    });
    console.log('depois');
});