How do I retrieve and output only the latest Facebook comment on my post using javascript (and Graph API?)

Question

I am building an html page which needs to be able to retrieve only the latest comment for a Facebook post. I would like to have it auto refresh and again re-load only the latest comment every 10 seconds. I am imagining that this would be done using the Facebook Graph API, Javascript and possibly an Ajax call? Any guidance would be greatly appreciated.

Answer 1

Assuming you know how to install the Javascript SDK and get an access token...

comments order has 3 (ranked, chronological (oldest first), reverse_chronological (newest first)

then include the limit modifier (to only retrieve one) from there the response should be enough to satisfy your needs

FB.api("/{post-id}/comments?order=reverse_chronological&limit=1", function (response) {
  if (response && !response.error) {
    console.log(response);
  }
});