JSFiddle - React, Tailwind, and code Playground

HTML

<form name="f1">
    <Input type=radio Name=r1 Value="NE">North East
    <Input type=radio Name=r1 Value="NW">North West
    <Input type=radio Name=r1 Value="SE">South East
    <Input type=radio Name=r1 Value="SW">South West
    <Input type=radio Name=r1 Value="midlands">Midlands</form>

JavaScript

window.addEventListener('load', function () {
    for (var i = 0; i < document.f1.r1.length; i++) {
        document.f1.r1[i].addEventListener("click", GetSelectedItem);
    }
}, false);

function GetSelectedItem() {
    alert(this.value);
}