Bootstrap Snippet Check Is On Screen using HTML CSS jQuery

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<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<div class="container">
    <div class="row">
        <div class="list-group">
            <div class="list-group-item">Test</div>
            <div class="list-group-item">Test</div>
            <div class="list-group-item">Test</div>
            <div class="list-group-item">Test</div>
            <div class="list-group-item">Test</div>
            <div class="list-group-item">Test</div>
            <div class="list-group-item">Test</div>
            <div class="list-group-item">Test</div>
            <div class="list-group-item">Test</div>   
            <div class="list-group-item">Test</div>
            <div class="list-group-item">Test</div>
            <div class="list-group-item">Test</div>
            <div class="list-group-item">Test</div>
            <div class="list-group-item">Test</div>
            <div class="list-group-item">Test</div>
            <div class="list-group-item">Test</div>
            <div class="list-group-item">Test</div>
            <div class="list-group-item">Test</div>   
            <div class="list-group-item">Test</div>
            <div class="list-group-item">Test</div>
            <div class="list-group-item">Test</div>
            <div class="list-group-item">Test</div>
            <div class="list-group-item">Test</div>
            <div class="list-group-item">Test</div>
            <div class="list-group-item">Test</div>
            <div class="list-group-item">Test</div>
            <div class="list-group-item">Test</div>     
            <div class="list-group-item">Test</div>
            <div class="list-group-item">Test</div>
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.list-group-item {transition: all 0.5s;}
.notOnScreen {background-color: red;}
.onScreen {background-color: green;}
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$(document).ready(function() {
  $.fn.isOnScreen = function(){
      var win = $(window);
      var viewport = {
          top : win.scrollTop(),
          left : win.scrollLeft()
      };
      viewport.right = viewport.left + win.width();
      viewport.bottom = viewport.top + win.height();
      var bounds = this.offset();
      bounds.right = bounds.left + this.outerWidth();
      bounds.bottom = bounds.top + this.outerHeight();
      return (!(viewport.right < bounds.left || viewport.left > bounds.right || viewport.bottom < bounds.top || viewport.top > bounds.bottom));
  };
  
    function addClassOnScreen(elem) {
        $(elem).each(function(){
          var $this = $(this);
          if($this.isOnScreen()){
                $this.addClass('onScreen');
                $this.removeClass('notOnScreen');
           }
          $(window).on('scroll', function () {
              if($this.isOnScreen()){
                $this.addClass('onScreen');
                $this.removeClass('notOnScreen');
              }else {
                  $this.removeClass('onScreen');
                  $this.addClass('notOnScreen');
              }              
          });          
        });
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"Check Is On Screen"
Bootstrap 4.1.1 Snippet by sdcarte

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Questions / Comments:

"Check Is On Screen" Bootstrap 4.1.1 Snippet by sdcarte

Related: See More

Questions / Comments:

"Check Is On Screen"
Bootstrap 4.1.1 Snippet by sdcarte