JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://ajax.aspnetcdn.com/ajax/jquery.validate/1.10.0/jquery.validate.min.js"></script>
<form id="myform">

<input type="text" class="myclass" name="field1" /><br />
<input type="text" class="myclass" name="field2" /><br />
<input type="text" class="myclass" name="field3" /><br />
<input type="submit" />

</form>

JavaScript

$(document).ready(function() {

    $('#myform').validate({
        submitHandler: function(form) { // for demo only
            return false;
        }
    });

    // the following method must come AFTER .validate()
    $("input[name^='field']").each(function() {
        $(this).rules('add', {
            required: true,
            digits: true
        });
    });

});