JSFiddle - React, Tailwind, and code Playground

HTML

<form action="">
    <input class="radio_male" type="radio" name="gender" value="Male"> Male
    <br>
    <input class="radio_female" type="radio" name="gender" value="Female"> Female
    <br>
    <input type="submit" value="Submit">
</form>

JavaScript

var $ = document.querySelector.bind(document);

$('form').onsubmit = function() {
    if(!$('.radio_male').checked && !$('.radio_female').checked) {
        console.log("false");
        return false;
    } else {
        console.log("true");
        return true;
    }
}