jQuery addClass example

Change class name on click in jQuery

by Dmitri Ganenco

HTML

<div class="wrapper">
    <div class="horse"></div>
    <div class="horse"></div>
    <div class="lion"></div>
    <div class="horse"></div>
    <div class="horse active"></div>
    <div class="elephant"></div>
    <div class="horse"></div>
    <div class="horse"></div>
</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

const activeClasses = $('.wrapper').find('.active').attr('class');

const as = activeClasses.split(' ').filter((c) => c != 'active')[0];

let resultIndex = -1;

 $('.wrapper').find('.' + as).toArray().forEach(function(el, index) {
  if($(el).hasClass('active')){
      resultIndex = index;
    }
   
}); 

console.log(resultIndex);