jQuery addClass example

Change class name on click in jQuery

HTML

<div class="slide p1"></div>
<div class="slide p2"></div>
<div class="slide p3"></div>

<div class="admin">
  <button class="next">NEXT</button>
</div>

CSS

body {
  margin: 0;
  height: 100%;
}

/* Less repetition */

.slide {
  height: 100vh;
  width: 70%;
}

.p1 {
  background-color: #2196F3;
}

.p2 {
  background-color: #E91E63;
}

.p3 {
  background-color: #01579B;
}

.admin {
  background-color: #B71C1C;
  height: 100vh;
  position: fixed;
  right: 0%;
  top: 0%;
  width: 30%;
  float: left;
}

JavaScript

let currSlide = 1;
const SLIDE_LENGTH = $('.slide').length;
$(".next").click(function() {
  currSlide = currSlide === SLIDE_LENGTH ? 1 : ++currSlide;
  $('html,body').animate({
      scrollTop: $(`.p${currSlide}`).offset().top
    },
    'slow');
});