tip in js
<!doctype html>
<html lang="en">
<head>
<title>Tip Calculator</title>
<!-- Required meta tags -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<!-- Bootstrap CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/css/bootstrap.min.css" integrity="sha384-PsH8R72JQ3SOdhVi3uxftmaW6Vc51MKb0q5P2rRUpPvrszuE4W1povHYgTpBfshb" crossorigin="anonymous">
</head>
<body class="bg-dark">
<div class="container">
<div class="row">
<div class="col-md-6 mx-auto">
<div class="card card-body text-center mt-5">
<h1 class="heading display-5 pb-3">Tip Calculator</h1>
<form id="tip-form">
<div class="form-group">
<div class="input-group">
<span class="input-group-addon">$</span>
<input type="number" class="form-control" id="billTotal" placeholder="Total Bill">
</div>
</div>
<div class="form-group tipPersent">
<div class="input-group">
<label for="">Tip:</label>
<input type="range" class="form-control" id="tipInput" value="0">
<span class="input-group-addon" id="tipOutput"></span>
</div>
</div>
</form>
<hr>
<!-- RESULTS -->
<div id="results" class="pt-4">
<h5>Results</h5>
<div class="form-group">
<div class="input-group">
<span class="input-group-addon">Tip amount</span>
<input type="number" class="form-control" id="tipAmount" disabled>
</div>
</div>
<div class="form-group">
<div class="input-group">
<span class="input-group-addon">Total Bill with Tip</span>
<input type="number" class="form-control" id="totalBillWithTip" disabled>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<!-- Optional JavaScript -->
<!-- jQuery first, then Popper.js, then Bootstrap JS -->
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.3/umd/popper.min.js" integrity="sha384-vFJXuSJphROIrBnz7yo7oB41mKfc8JzQZiCq4NCceLEaO4IHwicKwpJf9c9IpFgh" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/js/bootstrap.min.js" integrity="sha384-alpBpkh1PFOepccYVYDB4do5UnbKysX5WZXm3XxPqe5iKTfUKjNkCk9SaVuEZflJ" crossorigin="anonymous"></script>
</body>
</html>
