JSFiddle - React, Tailwind, and code Playground

HTML

<input id="input0" autofocus>
<input id="input1">

JavaScript

$('#input0').bind({
    blur: function () { console.log('blurred input0'); },
    keyup: function (e) {
        if (e.which === 38) {
            // UP -> jquery
            $('#input1').focus();
        } else if (e.which === 40) {
            // DOWN -> DOM
            document.getElementById('input1').focus();
        }
    }
});
$('#input1').bind({
    focus: function () { console.log('focused input1'); }
});