jQuery addClass example

Change class name on click in jQuery

HTML

<div class="banner-message">
Hello World
  <button>Change color</button>
</div>

<div class="banner-message">
Hello World
  <button>Change color</button>
</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

(function($) {
  var string = $('.banner-message');

  string.each(function(){
    var replaced = $(this).text().replace( /Hello /, 'Hi ' );
    $(this).html(replaced);
  });      
})(jQuery);