JSFiddle - React, Tailwind, and code Playground

HTML

<input type="radio" name="test" id="1" value="blabla1" />
<input type="radio" name="test" id="2" value="blabla2" />

JavaScript

document.getElementById('1').addEventListener('change', test1, false);

document.getElementById('2').addEventListener('change', test2, false);

function test1() {
    if(document.getElementById('1').checked) {
        alert("checked 1");
    }
    else {
        alert("unchecked 1");
    }
}

function test2() {
    if(document.getElementById('2').checked) {
        alert("checked 2");
    }
    else {
        alert("unchecked 2");
    }
}