JSFiddle - React, Tailwind, and code Playground

HTML

<div id="alfa">
<div class="beta"></div>
<div class="beta"></div>
</div>

JavaScript

jQuery.fn.isntEmpty = function() {
    var someIsEmpty = false;
    jQuery.each(jQuery(this), function(key, value) {
        if (value.innerHTML.length != 0) {
            someIsEmpty = true;
        }
    });
    return someIsEmpty;
};

if (jQuery("#alfa .beta").isntEmpty())  {
    alert('non empty');
} else {
    alert('empty');
}