JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" value="some">
<input type="text" value="text">
<input type="text" value="some">
<br>
<input type="text" value="text">
<input type="text" value="some">
<input type="text" value="text">
<br>
<input type="text" value="some">
<input type="text" value="text">
<input type="text" value="some">

JavaScript

var inputs = $$('input'), size = inputs.length;
inputs.invoke('observe','keyup',function(e){
    if(e.keyCode >= 37 && e.keyCode <= 40) {
        e.stop();
        var index = inputs.indexOf(e.element());
        if(e.keyCode == 37) index -= 1;
        if(e.keyCode == 39) index += 1;
        if(e.keyCode == 38) index -= 3;
        if(e.keyCode == 40) index += 3;
        if(index < 0) index += size;
        index = index % size;
        inputs[index].select();
    };
})