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 action="#" id="campaignForm" method="post">
<select name="html_url" id="html_url">
<option value="">Select One...</option>
<option value="one">ONE</option>
<option value="two">TWO</option>
</select>
<input type="submit" />
</form>

JavaScript

$(document).ready(function() {
    $('#campaignForm').validate({
        rules: {
            html_url: {
                required: true
            }
        },
        messages: {
            html_url: {
                required: 'Please select a template'
            }
        },
        submitHandler: function(form) { // blocks submission for demo
            return false;
        }
    });
});