jQuery addClass example

Change class name on click in jQuery

by Vasilii Chugunov

HTML

<div id="banner-message">
  <p>Hello World</p>
  <button id="first">Change color</button>
  <button id="second">Другая кнопка</button>
  <button id="thild">Третья кнопка</button>
</div>

CSS

.big {
  font-size: 64px !important;
} 
.smoll {
  background:red !important;
  font-size: 7px !important;
}
#banner-message.alt {
  background: #0084ff;
  color: #000000;
  margin-top: 160px;
  width: 200px;
}

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

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;
}

JavaScript

// find elements
var banner = $("#banner-message")
var button1 = $("#first")
var button2 = $("#second")
var button3 = $("#thild")

button2.on("click", function() {
  banner.toggleClass("big")
})

// handle click and add class
button1.on("click", function() {
  banner.toggleClass("alt")
})
button3.on("click", function() {
  banner.toggleClass("smoll" )
})