JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://ajax.aspnetcdn.com/ajax/jquery.validate/1.14.0/jquery.validate.js"></script>
<form id="myform">
    <input type="text" name="studentid" />
    <br />
    <br />
    <input type="submit" />
</form>

JavaScript

$(document).ready(function() {

    $("#myform").validate({
        rules: {
            studentid: {
                required: true,
                digits: true,
                maxlength: 7,
                minlength: 7
            }
        },
        messages: {
            studentid: "Invalid Format"
        }
    });

});