JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
<script>
$(document).ready(function(){
    $(function() {
    $('#select').change(function(){
        if ($(this).val() == "2") {
            $('#my_custom_message').show();
        } else {
            $('#my_custom_message').hide();
        }
    });
});
});
</script>
<select id="select">
    <option value="1">UK standard(free)</option>
    <option value="2">UK NEXT DAY $8.99</option>
</select>

<div id="my_custom_message" style="display:none">Select next day delivery and order before 2pm to receive your order on Wednesday 3 December 2014</div>