Store Strikingly email in a cookie

strikingly_email_cookie.html

<script>
  window.runAfterDomBinding.add("custom", function() {
     window.edit_page.Event.subscribe('Site.contactForm.submit', function() {
      var tldLength = function(){
        if(window.location.hostname.match(/\.\w{2}\.\w{2,3}/i))
        {
          return 2; //.co.uk
        } else {
          return 1; //.com or .uk
        }
      };
      // Get domain name. Take last 2 from 'example.com' and last 3 from 'example.co.uk'
      var domain = window.location.hostname.split('.').slice(-(tldLength()+1)).join('.');

      // Set email in cookie
      var email = document.querySelectorAll("[name='collected_email[email]']")[0].value;
      document.cookie = 'signup_email='+email+'; domain='+domain;

      // redirect the page to success page
      window.location = "//signup."+domain;
    });
  });
</script>