JSFiddle - React, Tailwind, and code Playground

by Satpal Singh

HTML

<script src="https://code.jquery.com/jquery-2.2.4.min.js"></script>
<input type="checkbox" id="cb_31" class="observedType" data-type="observedType1">
<input type="checkbox" id="cb_32" class="observedType" data-type="observedType1" checked="checked">
<input type="checkbox" id="cb_33" class="observedType" data-type="observedType1">
<input type="checkbox" id="cb_40" class="observedType" data-type="observedType2" checked="checked">

JavaScript

var clss = $(".observedType:checked").map(function() {
  return $(this).data('type')
}).get();
console.log(clss);