<-- KIRTISHIL PATIL-->
<!doctype html>
<html lang="en">
<head>
<title>Title</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://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
<style>
.small {
color: #b0aeb8;
text-transform: capitalize;
font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}
.small-err {
color: #ff2525;
font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}
.input-err,
.input-err:focus {
border: 1px solid #ff2525;
box-shadow: 0 0 0 0.2rem #ff00003b;
}
</style>
</head>
<body>
<h1>User unable to enter alphabets strict to numbers only</h1>
<small class="small limiterr mt-2">Limit</small>
<div class="form-group">
<input type="text" class="form-control" name="" min="1" max="700" maxlength="3" onkeyup="isNumber(this.value, this)" id="limit" aria-describedby="helpId" placeholder="Enter Value" value="500" />
</div>
<!-- Optional JavaScript -->
<!-- jQuery first, then Popper.js, then Bootstrap JS -->
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>
<script>
function isNumber(val, elem) {
val = val.trim();
var reg = /^\d+$/;
if (reg.test(val)) {
//normal css
$("#limit").removeClass("input-err");
$(".limiterr").removeClass("small-err");
} else {
//red css
$("#limit").addClass("input-err");
$(".limiterr").addClass("small-err");
$(elem).val("");
}
}
</script>
</body>
</html>
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