<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">
<h2>Input type number validation</h2>
<form class="set">
<label>Number</label>
<input type="text" class="form-control" pattern="[0-9]{10}" maxlength="10" oninput="this.value=this.value.replace(/[^0-9]/g, '').replace(/(\..*)\./g, '$1');" name="phone" placeholder="Phone" required="" title="Phone number should be 10-digits">
</form>
</div>
</div>
