jQuery addClass example

Change class name on click in jQuery

HTML

<div id="banner-message">
  <p>Hello World</p>
  <a href='https://www.duckduckgo.com'>Go Away</a>
</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")
})



$(window).on('beforeunload', function(event) {
 var unsaved = "Are you sure you want to exit?";
    var text = 'Test Text @@@';
    //var text = $('.article_div textarea').val();
    if (text.length > 0){
    		return unsaved;
    }
});