JSFiddle - React, Tailwind, and code Playground

HTML

<div id="expander" class="closed">></div>

CSS

.closed {color:red;}
.open {color:blue;}

JavaScript

$("#expander").click(function(){
    var $this = $(this);
    $this.toggleClass('open closed');
    if($this.hasClass('open')){
       // do your open code
       console.log('open');
    }else{
       // do your close code
         console.log('close');
    }   
});