jQuery addClass example

Change class name on click in jQuery

HTML

<div id="banner-message">
  <div class="test">
  Test
  </div>
  <div class="test">
  Test
  </div>
  <div class="test">
  Test (should be red !)
  </div>
  <div class="pringle">
  Test pringle
  </div>
</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;
}

#banner-message .test:last-of-type {
  background: red;
}

JavaScript

// find elements
var banner = $("#banner-message")
var button = $("button")

// handle click and add class
button.on("click", function(){
  banner.addClass("alt")
})