JSFiddle - React, Tailwind, and code Playground

HTML

<input type="checkbox" value="a">
<input type="checkbox" value="b">
<input type="checkbox" value="c">

JavaScript

jQuery(document).ready(function(){

jQuery('input:checkbox').change(
function(){
    alert("d");
    if (jQuery('input:checkbox:checked').length == jQuery('input:checkbox').length){
        
        alert('Alert Text.');
    
    }
});
});