jQuery addClass example

Change class name on click in jQuery

by Dmitri Ganenco

HTML

<div id="sp-pocetna-0"></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

var slidnum = $("div[id^='sp-pocetna']").length;
console.log("Total Scrolls: " + slidnum);
$(window).on('load resize scroll', function() {

  for (let i = 0; i < slidnum; i++) {
    var strane = $("div[id^='sp-pocetna" + i + "']");
    strane.each(function() {
      $("#sp-dots .custom li:nth-child(" + i + ") a").toggleClass("active", $(this).isInViewport());
    });
  }
});