JSFiddle - React, Tailwind, and code Playground

HTML

<select id="show_div" name="test">
      <option value="1">one</option>
      <option value="2" id="show_div">two</option>
</select>
<div id="show_block" style="display:none;">it works!</div>

JavaScript

$('#show_div').change(function(){
      $('#show_block').show();
  });