Campaign Monitor AJAX Popup Signup; edited for Tricky3 / Shopify, Liquid

ajaxsubscribe.liquid

<!-- 1. Take your Campaign Monitor subscribe form as generated from within your account [now iz html5]: -->

<form action="http://myaccount.createsend.com/a/b/c/defgh/" method="post" id="subForm">
  <div>
    <label for="name">Name:</label><br>
    <input type="text" name="cm-name" id="name"><br>
    <label for="abcd-efgh">Email:</label><br>
    <input type="text" name="cm-abcd-efgh" id="abcd-efgh" placeholder="Your Email Address"{% if customer %} value="{{ customer.email }}"{% endif %} required><br>
    <input type="submit" value="Subscribe">
  </div>
</form>

<!-- 2. Add some JavaScript -->

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js"></script> 
<script type="text/javascript">
  $(function () {
    $('#subForm').submit(function (e) {
      e.preventDefault();
      $.getJSON(
      this.action + "?callback=?",
      $(this).serialize(),
      function (data) {
        if (data.Status === 400) {
          alert("Error: " + data.Message);
        } else { // 200
          alert("Success: " + data.Message);
        }
      });
    });
  });
</script>

<!-- 3. You have an AJAX subscribe form! -->