jQuery addClass example

Change class name on click in jQuery

by jrdiaz

HTML

<div id="banner-message" style="position:relative;">
  <p>Hello World</p>
  <button>Change color</button>
  
  <div style="position:absolute; top: 0; right : 0;">
    <div class="button" style="background:white;border:0px solid red;border-bottom:0;width:70px;position:relative;z-index:1;margin-left:auto; margin-right:0;box-shadow: 0px -7px 5px 2px rgba(0,0,0,0.75);">
      Button
    </div>
    <div class="content" style="background:white;position:relative;top:-2px;border:0px solid green;min-width:150px;box-shadow: 0px 0px 5px 2px rgba(0,0,0,0.75);">
      Contents<br/>
      Contents<br/>
      Contents<br/>
      Contents<br/>
      Contents<br/>
      Contents<br/>
    </div>
  </div>
  
  <br/>
  <br/>
  <br/>
  <br/>
  <br/>
  <br/>
  <br/>
  <br/>
  
</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

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

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