jQuery addClass example

Change class name on click in jQuery

by Rishi Gautam

HTML

<div class="box yellow circle 50">50</div>
<div class="box yellow circle 50">60</div>
<div class="box yellow circle 50">70</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 elem = document.getElementsByClassName('box');

for (var i = 0; i < elem.length; i++) {
  var current = elem[i];

  console.log(current.classList);

}