jQuery addClass example

Change class name on click in jQuery

by aborrell

HTML

<div id="banner-message">
  <p>Hello World</p>
  <button>Change color</button>
</div>
<select id="mySelectBox">
    <option value="dogs">Dogs</option>
    <option value="cats">Cats</option>
    <option value="fish">Gold Fish</option>
    <option value="rocks">Rocks</option>
</select>
<button id="testButton">Change!</button>

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")
var button = $("button")

// handle click and add class
button.on("click", function(){
  banner.addClass("alt")
})
$( 'button#testButton' ).click(function() {
	alert("hola");
 
  $( '#mySelectBox option[value="rocks"]').prop( 'selected', 'selected' );
});