"addClass When Visible"
Bootstrap 3.3.0 Snippet by intransitorio

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<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<button id="testElement" class="btn btn-default">
Hello
</button>
<div style="height:400px">Some content</div>
<button id="testElement1" class="btn btn-default">
Hi
</button>
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.red{
background: red;
margin-top: -150px;
display: block;
}
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$(window).on('scroll', function() {
var $elem = $('#testElement1');
var $window = $(window);
var docViewTop = $window.scrollTop();
var docViewBottom = docViewTop + $window.height();
var elemTop = $elem.offset().top;
var elemBottom = elemTop + $elem.height();
if (elemBottom < docViewBottom) {
$('#testElement1').addClass('red');
}
});
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