JSFiddle - React, Tailwind, and code Playground

by SimoneGianni

HTML

<html>
    <body>
        <div id="a">A div</div>
        <div id="b">B div</div>
    </body>
</html>

JavaScript

jQuery.fn.preinit = jQuery.fn.init;
    jQuery.fn.init = function( selector, context, rootjQuery ) {
        this.preinit(selector,context,rootjQuery);
        if (this.length == 0) alert(selector + " on " + context + " returned 0 elements");
    }
    jQuery.fn.init.prototype = jQuery.fn;


$(function() {
    $('#a');
    $('#notfound'); 
});