JSFiddle - React, Tailwind, and code Playground

HTML

<form id="form1">
    <input type="radio" name="group1" value="Milk" />Milk
    <input type="radio" name="group1" value="Butter"/> Butter 
</form>

<form id="form2" style="display:none;">
    <input id="foo" type="text"/>
</form>

JavaScript

$('input').click(function() {
    if ($('input:checked').val() == 'Milk') {
        $('#form2').show();
    }
});