jQuery script which will post a form to another url before posting to the default action attribute. Being used to capture a form lead submission to both the first party platform as well as Salesforce.

jquery-form-post-capture.js

<script type="text/javascript">    
  // Using jQuery Library 
  $('#salesforce-form').one('submit', function(e) {   
    e.preventDefault();
    var $form = $(this);
    $.ajax({
      url: '{{ page.getUrl() }}',
      type: 'POST',
      data: $form.serialize(),
      success: function cb() {
        $form.trigger('submit');
      }
    });
  });
</script>

The one method will attach our on submit callback and detach it after it's been executed. So our callback code is triggered. Which just posts the form data to the current page. The callback is detached and we trigger another form submit which will cause the normal form submission action post to occur.

We're using Parsley to get a reference to the current page url.