title: Disqus this.callbacks.onNewComment not working
body: <p>I somehow cannot get the Disqus this.callbacks.onNewComment to work. What could be wrong? Im trying to alert('hey!') once a new comment is posted. <a href="https://help.disqus.com/customer/portal/articles/466258-capturing-disqus-commenting-activity-via-callbacks/" rel="nofollow noreferrer" title="source">Source</a></p>
  
  <pre><code>&lt;script&gt;
  var disqus_config = function () {
  this.page.url = PAGE_URL;  
  this.page.identifier = PAGE_IDENTIFIER;
      this.callbacks.onNewComment = [function(comment) {
            alert(comment.id);
            alert(comment.text);
            alert('hey!');
  
      }];
  };
  
  (function() {  // DON'T EDIT BELOW THIS LINE
      var d = document, s = d.createElement('script');
  
      s.src = 'https://example.disqus.com/embed.js';
  
      s.setAttribute('data-timestamp', +new Date());
      (d.head || d.body).appendChild(s);
  })();
  </code></pre>
  
  <p></p>