JSFiddle - React, Tailwind, and code Playground

HTML

<div>Hey, what?</div>
<select>
    <option>-</option>
    <option>1</option>
    <option>2</option>
</select>

JavaScript

$('select').change(function() {
    switch (this.selectedIndex) {
    case 0:
        break;
    case 1:
        $('div').fadeOut(300, function() {
            $(this).show();
        });
        break;
    case 2:
        $('div').slideUp(300, function() {
            $(this).show();
        });
        break;
    }
});