jQuery addClass example

Change class name on click in jQuery

HTML

<div id="banner-message">
  <p>Hello World</p>
  <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.alt2 button {
  background: #000;
  color: #fff;
}

#banner-message.alt2 {
  background: red;
  color: #fff;
  margin-top: 40px;
  width: 200px;
}

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

JavaScript

var banner = $("#banner-message")
var button = $("button")

button.on("click", function() {
  banner.addClass("alt")
  $("<br><button class='test'>TEST</button><br>").insertAfter(button);

  //This one works:
  $(".test").on("click", function() {
    banner.removeClass("alt")
    banner.addClass("alt2")
  })

})
//This one doesn't work:
$(".test").on("click", function() {
  banner.removeClass("alt")
  banner.addClass("alt2")
})