"scrolltop button javascript Anirudha Bhowmik"
Bootstrap 4.1.1 Snippet by anirudhabhowmik

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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 ---------->
<a id="back-to-top" href="#" class="btn btn-primary btn-lg back-to-top" role="button" title="Click to return on the top page" data-toggle="tooltip" data-placement="left"><span class="glyphicon glyphicon-chevron-up"></span></a>
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.back-to-top {
cursor: pointer;
position: fixed;
bottom: 20px;
right: 20px;
display:none;
}
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$(document).ready(function(){
$(window).scroll(function () {
if ($(this).scrollTop() > 50) {
$('#back-to-top').fadeIn();
} else {
$('#back-to-top').fadeOut();
}
});
// scroll body to 0px on click
$('#back-to-top').click(function () {
$('#back-to-top').tooltip('hide');
$('body,html').animate({
scrollTop: 0
}, 800);
return false;
});
$('#back-to-top').tooltip('show');
});
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