TL;DR see this demo project for the final solution. Please be aware that the examples here are provided with ES6 syntax. There are different ways to get ES6 to work in Rails. The demo project has an ES5 branch for reference. If you are reading this I assume you are familiar with Ruby on Rails and SweetAlert2. With Rails before version 5.1, when rails-ujs was still jquery-ujs, there was an easy way
