JSFiddle - React, Tailwind, and code Playground

by soniii

HTML

<select id="dropdown">
  <option value="" selected="selected">Please Select...</option>
  <option value="option 1">Option 1</option>
  <option value="option 2 ">Option 2</option>
</select>
<button id="addNew" disabled>Add new</button>

JavaScript

$("#dropdown").change(function() {
  $("#addNew").prop("disabled", false);
});

$("#addNew").click(function() {
  $("#dropdown").append($(new Option("New option", 4)));
});