JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://ajax.aspnetcdn.com/ajax/jquery.validate/1.9/jquery.validate.min.js"></script>
<form>
    <input type="text" class="required" /><br />
    <select id="sel1" type="your_select">
        <option value="-1">Select Option</option>
        <option value="optionOne">one</option>
        <option value="optionTwo">two</option>
    </select><br />
    <input type="submit" />
</form>

JavaScript

jQuery.validator.addMethod("your_select", function(value, element) { 
  return value != -1; 
}, "Please select something");


$('form').submit(function(event) {
    event.preventDefault();
}).validate();