JSFiddle - React, Tailwind, and code Playground

HTML

<div id="warning">There is something selected!!!</div>
<input type=checkbox>
<input type=checkbox>
<input type=checkbox>
<input type=checkbox>
<input type=checkbox>

CSS

#warning {
    display: "none";
}

JavaScript

$('input[type=checkbox]').on('change', function () {
    if ($('input[type=checkbox]:checked').length > 0) {
        $("#warning").show(); // any one is checked
    } else {
        $("#warning").hide(); // none is checked
    }
});