I would like to track addition of page comments in Google Analytics. I hoped it would be easy to do this by extending the PageComment class onAfterWrite function. However, I can't find a way to include the Google Analytics JS and get it executed.

PageCommentGoogleAnalyticsWrite.php

class PageCommentGoogleAnalytics extends DataObjectDecorator {
  function onAfterWrite() {
   	parent::onAfterWrite();
	return $this->owner->renderWith("PageCommentGoogleAnalyticsWrite");
   }
}

PageCommentGoogleAnalyticsWrite.ss

<script>
alert("PageCommentGoogleAnalyticsWrite");
</script>

Anyone any tips on how to track posting of comments in Google Analytics?