JSFiddle - React, Tailwind, and code Playground

HTML

<div id="div1">
    <input type="radio" name="r1" value="v1" />
    <input type="radio" name="r1" value="v2" />
    <input type="radio" name="r1" value="v3" />
    
    <input type="radio" name="r2" value="v1" />
    <input type="radio" name="r2" value="v2" />
    <input type="radio" name="r2" value="v3" />
    
    <input type="radio" name="r3" value="v1" />
    <input type="radio" name="r3" value="v2" />
    <input type="radio" name="r3" value="v3" />
</div>

JavaScript

$(":radio").change(function() {
    var names = {};
    $(':radio').each(function() {
        names[$(this).attr('name')] = true;
    });
    var count = 0;
    $.each(names, function() { 
        count++;
    });
    if ($(':radio:checked').length === count) {
        alert("all answered");
    }
}).change();