Bootstrap Snippet scrolling background changed using HTML CSS Javascript

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<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
      
        <div class="panel" data-color="white">
    <div>
      <h1>Magic scrolling colours</h1>
      <p>Scroll to animate the background colour of the body as a full height panel becomes visible.</p>
      <p>I have tried to comment the code, particurly the JavaScript, as much as possible. I hope it's clear to understand.</p>
      <p>If you have any questions my twitter is <a href="https://twitter.com/daveredfern">@daveredfern</a>.</p>
  </div>
</div>
<div class="panel" data-color="violet">
  <h2>Violet panel</h2>
</div>
<div class="panel" data-color="indigo">
  <h2>Indigo panel</h2>
</div>
<div class="panel" data-color="blue">
  <h2>Blue panel</h2>
</div>
 
        
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/* Setting fade transition and default settings */
body {
  color: #000;
  background-color: #fff;
  transition: background-color 1s ease;
}
/* panel styles */
.panel {
  /* min height incase content is higher than window height */
  min-height: 100vh;
  display: flex;
  justify-content: space-around;
  align-items: center;
  font-family: sans-serif;
  /* outline: 10px solid hotpink; */
  /* turn above on to see the edge of panels */
}
/* colours */
.color-violet {
  background-color: green;
}
.color-indigo {
  background-color: #4332CF;
}
.color-blue {
  background-color: red;
}
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$(window).scroll(function() {
  
  // selectors
  var $window = $(window),
      $body = $('body'),
      $panel = $('.panel');
  
  // Change 33% earlier than scroll position so colour is there when you arrive.
  var scroll = $window.scrollTop() + ($window.height() / 1);
 
  $panel.each(function () {
    var $this = $(this);
    
    // if position is within range of this panel.
    // So position of (position of top of div <= scroll position) && (position of bottom of div > scroll position).
    // Remember we set the scroll to 33% earlier in scroll var.
    if ($this.position().top <= scroll && $this.position().top + $this.height() > scroll) {
          
      // Remove all classes on body with color-
      $body.removeClass(function (index, css) {
        return (css.match (/(^|\s)color-\S+/g) || []).join(' ');
      });
       
      // Add class of currently active div
      $body.addClass('color-' + $(this).data('color'));
    }
  });    
  
}).scroll();
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"scrolling background changed"
Bootstrap 4.0.0 Snippet by esraful

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"scrolling background changed" Bootstrap 4.0.0 Snippet by esraful

Related: See More

Questions / Comments:

"scrolling background changed"
Bootstrap 4.0.0 Snippet by esraful