"scrolling background changed"
Bootstrap 4.0.0 Snippet by esraful

<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>
/* 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; }
$(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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