JSFiddle - React, Tailwind, and code Playground

by Sunny SM

HTML

<input name="r" value="1" type="radio">
<input name="r" value="2" type="radio">
<input name="r" value="3" type="radio">
<button id="goBtn">hm</button>

JavaScript

function btn() {
    var radio = document.getElementsByTagName("input");
    var c=null;
    for (var i = 0; i < radio.length; i++){
        if (radio[i].checked){
           c = radio[i].value;
        }   
    }
    if(c !== null){
        alert(c);
    }else{
        alert("none selected");
    }
}

document.getElementById('goBtn').addEventListener('click', btn);