JSFiddle - React, Tailwind, and code Playground
HTML
<select>
<option name="1st" id="1st" value="1st"></option>
<option name="2nd" id="2nd" value="2nd"></option>
</select>
<input type="text" name="textinput" id="textinput">
JavaScript
$('select').change(function(){
($(this).val() == '2nd' ? $('input').fadeOut():$('input').fadeIn())
});