jQuery addClass example

Change class name on click in jQuery

by Dmitri Ganenco

HTML

<div id="banner-message">
</div>

CSS

body {
  background: #20262E;
  padding: 20px;
  font-family: Helvetica;
}

#banner-message {
  background: #fff;
  border-radius: 4px;
  padding: 20px;
  font-size: 25px;
  text-align: center;
  transition: all 0.2s;
  margin: 0 auto;
  width: 300px;
}

button {
  background: #0084ff;
  border: none;
  border-radius: 5px;
  padding: 8px 14px;
  font-size: 15px;
  color: #fff;
}

#banner-message.alt {
  background: #0084ff;
  color: #fff;
  margin-top: 40px;
  width: 200px;
}

#banner-message.alt button {
  background: #fff;
  color: #000;
}

JavaScript

// find elements
var banner = $("#banner-message")
banner.css('width', () => {
	const	windowWidth = $(window).width();
	const rightAreaWidth = $('#right-area').width();
	debugger;
	return windowWidth < 350 || rightAreaWidth < 600 ? '100%' : windowWidth < 800 || rightAreaWidth < 800 ? '50%' : '33%';
});