JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://code.jquery.com/jquery-3.1.1.min.js&quot;   integrity=&quot;sha256-hVVnYaiADRTO2PzUGmuLJr8BLUSjGIZsDYGmIJLv2b8=&quot;   crossorigin=&quot;anonymous"></script>
<form>
  <select id="workbase">
    <option>1</option>
    <option>2</option>
  </select>
</form>

JavaScript

$(function() {
    var app = {

      common: {

        init: function() {

          //Initialisate the request object
          app.request.init();
        }

      },

      request: {

        users: "helloworld",

        init: function() {
          alert("...request started...");
          $('form').on('change', '#workbase', this.workBaseChange.bind(this));
        },

        workBaseChange: function(e) {
          debugger;
          var that = this;
          console.log(this);
        }

      },

      validation: {}

    }

    app.request.init();
  })