Question

13

How does paging in facebook javascript API work?

rated 0 times [ 20] [ 7] / answers: 1 / hits: 31836 / 14 Years ago, thu, february 17, 2011, 12:00:00

I'm trying to recover the last week posts in my facebook news feed with the javascript sdk.
I'm able to get the first page but then, I don't know how to continue iterating through the other pages. I've tried it with the following code:

 $('#loadPosts').bind('click', function() {     

            FB.api('/me/home',{since:'last week'}, getPosts);   

          });



 getPosts = function(response){

        for (element in response.data){

            post = response.data[element]

            console.log(post);          

          }



          previousPage = response.paging.previous;        

          console.log(previousPage);



          // can i call FB.api(previousPage, getPosts); ??      



      }

But I'm getting a URL as previous page and I don't know how to make a javascript FB.api call from that URL. Any ideas?

Answers

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andreguym

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3 Years ago

answered 14 Years ago masonm · Accepted Answer

Alright, it seems a lot of whining about a simple issue that I still believe my old answer clarifies. Anyway, let me babysit you. :)

First: I find out that you cannot really go to the previous page from the first page. Ideally, I should. So, here is a bug that I have filed you may want to follow: https://developers.facebook.com/bugs/391562790938294?browse=search_50fcac3ce094e7068176315

Second: If this is by design, you cannot go back to previous from the first page (because there is no previous), but you can surely go to Next. However, since the API behaves as a cursor, and you have moved forward, now your previous page would work.

The answer to the question:

I'm getting a URL as previous page and I don't know how to make a javascript FB.api call from that URL. Any ideas?

yes, you can make FB.api call. But I suggest you to make a HTTP GET call instead, because it's easier. Also, note that previous may return and empty array like {data:[]}

How to get previous/next page?

Here, I am writing a small code that uses jQuery. In case you do not want to read the code, there are two ways:

Use previous/next URL and make HTTP GET request. Which, if not empty, will come with next set of previous, next link.

Parse the URL, and get the query-string as JSON ans pass it to FB.api. I used jQuery BBQ pluging for parsing.

Important Note: In the example, I am using next URL because on the first request if I use previous it gives empty JSON instead of giving posts from the past. However, I can use use previous URL once I have moved ahead a few pages. Like Google results, you can not go previous on page 1, but you can from any page > 1 (see Example 3 below). This is called pagination.

Example 1: Code using HTTP GET (preferred): (I will load 3 posts/page and look three next-pages)

<html>

<head>

<script type=text/javascript src=http://ajax.googleapis.com/ajax/libs/jquery/1.8/jquery.min.js></script>

<script type=text/javascript src=http://connect.facebook.net/en_US/all.js></script>

<script type=text/javascript src=https://raw.github.com/cowboy/jquery-bbq/master/jquery.ba-bbq.min.js></script>

<script>



var i =0;

var getPosts = function (response){

          for (element in response.data){

            post = response.data[element]

            console.log(post.id + :  +post.message);          

          }







          // can i call FB.api(nextPage, getPosts); ??

          if(i < 2){

              nextPage = response.paging.next;        

              console.log(nextPage);

              i++;

              //Method 1: I use it.

              $.get(nextPage, getPosts, json); //optional: $.getJSON can be use instead

          }



      }



$(document).ready(function(){



$('#loadPosts').bind('click', function() {

            FB.api('/me/home',{since:'yesterday','limit': '3'}, getPosts);   

          });

})

</script>

</head>

<body>

<div id=fb-root></div>

<script>

  window.fbAsyncInit = function() {

    // init the FB JS SDK

    FB.init({

      appId      : 'XXXXXXXXXXXX', // FILL YOUR APP ID HERE!

      status     : true, // check the login status upon init?

      cookie     : true, // set sessions cookies to allow your server to access the session?

    });



    // Additional initialization code such as adding Event Listeners goes here



  };

</script>

<button id=loadPosts>Load Posts</button>

<p>Please open developer console to see what's happening. In Firefox, you can use ctrl+shift+k, and in Chrome/Chromium use ctrl+shift+i</p>

</body>

</html>

Response:

100004192352945_156620584487686: undefined

137723270230_10152423499430231: On this day, please spare a thought for those fellow citizens, for whom I just spare a thought and do nothing else.

642965867_10151211036740868: Thanks everyone for their wishes! The wishes made my day!



https://graph.facebook.com/677811901/home?limit=3&access_token=AAACYjXGS5FQBAIR3brc2LibjBcZCi2kRJUybG8VMaaJSZARQ8SzNE7BE4PBrDIFVZB0AaVEa1dZCpX1fhCvoD2rnq8uc8OGaIFhO9uvVXAZDZD&until=1359184568

367116489976035_536776529676696: Rage. Quit. Life.

899605553_10152450871820554: undefined

367116489976035_417820828298092: undefined



https://graph.facebook.com/677811901/home?limit=3&access_token=AAACYjXGS5FQBAIR3brc2LibjBcZCi2kRJUybG8VMaaJSZARQ8SzNE7BE4PBrDIFVZB0AaVEa1dZCpX1fhCvoD2rnq8uc8OGaIFhO9uvVXAZDZD&until=1359179890

137723270230_10152423148745231: Pratibha Patil used to love the Republic Day Parade, especially the part where the visiting Chief Guest extended her an invitation to visit his/her own country.

137723270230_10152423131700231: The Kingfisher tableau at Republic Day Parade was so simple. Vijay Mallya riding a bicycle.

367116489976035_484460034950769: undefined

Example 2: Code using FB.api: (I will load 3 posts/page and look three next-pages)

<html>

<head>

<script type=text/javascript src=http://ajax.googleapis.com/ajax/libs/jquery/1.8/jquery.min.js></script>

<script type=text/javascript src=http://connect.facebook.net/en_US/all.js></script>

<script type=text/javascript src=https://raw.github.com/cowboy/jquery-bbq/master/jquery.ba-bbq.min.js></script>

<script>



var i =0;

var getPosts = function (response){

          for (element in response.data){

            post = response.data[element]

            console.log(post.id + :  +post.message);          

          }







          // can i call FB.api(nextPage, getPosts); ??

          if(i < 2){

              nextPage = response.paging.next;        

              console.log(nextPage);

              i++;



              //Method 2: If you have to call FB.api

              var params = jQuery.deparam.querystring(nextPage);

              console.log(JSON.stringify(params, null, 2));

              FB.api('/me/home', params, getPosts)

          }



      }



$(document).ready(function(){



$('#loadPosts').bind('click', function() {

            FB.api('/me/home',{since:'yesterday','limit': '3'}, getPosts);   

          });

})

</script>

</head>

<body>

<div id=fb-root></div>

<script>

  window.fbAsyncInit = function() {

    // init the FB JS SDK

    FB.init({

      appId      : 'XXXXXXXXXXXX', // FILL YOUR APP ID HERE!

      status     : true, // check the login status upon init?

      cookie     : true, // set sessions cookies to allow your server to access the session?

    });



    // Additional initialization code such as adding Event Listeners goes here



  };

</script>

<button id=loadPosts>Load Posts</button>

<p>Please open developer console to see what's happening. In Firefox, you can use ctrl+shift+k, and in Chrome/Chromium use ctrl+shift+i</p>

</body>

</html>

Response:

367116489976035_536776529676696: Rage. Quit. Life.

899605553_10152450871820554: undefined

367116489976035_417820828298092: undefined

{

  limit: 3,

  access_token: AAACYjXGS5FQBAIR3brc2LibjBcZCi2kRJUybG8VMaaJSZARQ8SzNE7BE4PBrDIFVZB0AaVEa1dZCpX1fhCvoD2rnq8uc8OGaIFhO9uvVXAZDZD,

  until: 1359179890

}



137723270230_10152423148745231: Pratibha Patil used to love the Republic Day Parade, especially the part where the visiting Chief Guest extended her an invitation to visit his/her own country.

137723270230_10152423131700231: The Kingfisher tableau at Republic Day Parade was so simple. Vijay Mallya riding a bicycle.

367116489976035_484460034950769: undefined



https://graph.facebook.com/677811901/home?limit=3&access_token=AAACYjXGS5FQBAIR3brc2LibjBcZCi2kRJUybG8VMaaJSZARQ8SzNE7BE4PBrDIFVZB0AaVEa1dZCpX1fhCvoD2rnq8uc8OGaIFhO9uvVXAZDZD&until=1359178140

{

  limit: 3,

  access_token: AAACYjXGS5FQBAIR3brc2LibjBcZCi2kRJUybG8VMaaJSZARQ8SzNE7BE4PBrDIFVZB0AaVEa1dZCpX1fhCvoD2rnq8uc8OGaIFhO9uvVXAZDZD,

  until: 1359178140

}

655515199_403590309726450: a good resolution to take on Republic Day

505588854_496901583686790: Love the secret world that slow motion reveals.

693811975_10151217837201976: undefined

Example 3: Performing: page1 -> page2 -> page1 or page -> next -> previous The following code will load page1, then go to next page (page2), then come back to page1, using previous

<html>

<head>

<script type=text/javascript src=http://ajax.googleapis.com/ajax/libs/jquery/1.8/jquery.min.js></script>

<script type=text/javascript src=http://connect.facebook.net/en_US/all.js></script>

<script type=text/javascript src=https://raw.github.com/cowboy/jquery-bbq/master/jquery.ba-bbq.min.js></script>

<script>



var i =0;

var getPosts = function (response){

          for (element in response.data){

            post = response.data[element]

            console.log(post.id + :  +post.message);          

          }







          // can i call FB.api(nextPage, getPosts); ??

          if(i < 2){

              nextPage = response.paging.next;        

              if(i==1)

                nextPage = response.paging.previous;



              console.log(nextPage);

              i++;

              $.get(nextPage, getPosts, json); //optional: $.getJSON can be use instead

          }



      }



$(document).ready(function(){



$('#loadPosts').bind('click', function() {

            FB.api('/me/home',{since:'yesterday','limit': '3'}, getPosts);   

          });

})

</script>

</head>

<body>

<div id=fb-root></div>

<script>

  window.fbAsyncInit = function() {

    // init the FB JS SDK

    FB.init({

      appId      : 'XXXXXXXXXXXX', // FILL YOUR APP ID HERE!

      status     : true, // check the login status upon init?

      cookie     : true, // set sessions cookies to allow your server to access the session?

    });



    // Additional initialization code such as adding Event Listeners goes here



  };

</script>

<button id=loadPosts>Load Posts</button>

<p>Please open developer console to see what's happening. In Firefox, you can use ctrl+shift+k, and in Chrome/Chromium use ctrl+shift+i</p>

</body>

</html>

Response:

PAGE1:

367116489976035_536806916340324: How big is the Solar System?

Full infographic here: http://bit.ly/WmzfVn

137723270230_10152423534790231: Sociologist Ashis Nandy has claimed that most of the corrupt came from OBC/SC/ST castes.

Following this, Corrupt people have strongly condemned Nandy's attempts to divide them on caste lines. They'll be united in loot, forever.

100004192352945_156620584487686: undefined



PAGE2:

https://graph.facebook.com/677811901/home?limit=3&access_token=AAACYjXGS5FQBAKqIMyCVYjH9upK4e2bjUwLoVbbFDL0ffc0SZBTVR9MUFGV4ZCq6HBdFIadFMpLDC3ATMZCJ4GPsXWpG4qTGODavuvzLAZDZD&until=1359185659



137723270230_10152423499430231: On this day, please spare a thought for those fellow citizens, for whom I just spare a thought and do nothing else.

642965867_10151211036740868: Thanks everyone for their wishes! The wishes made my day!

367116489976035_536776529676696: Rage. Quit. Life.



PAGE1:

https://graph.facebook.com/677811901/home?limit=3&access_token=AAACYjXGS5FQBAKqIMyCVYjH9upK4e2bjUwLoVbbFDL0ffc0SZBTVR9MUFGV4ZCq6HBdFIadFMpLDC3ATMZCJ4GPsXWpG4qTGODavuvzLAZDZD&since=1359185123&__previous=1



367116489976035_536806916340324: How big is the Solar System?

Full infographic here: http://bit.ly/WmzfVn

137723270230_10152423534790231: Sociologist Ashis Nandy has claimed that most of the corrupt came from OBC/SC/ST castes.

Following this, Corrupt people have strongly condemned Nandy's attempts to divide them on caste lines. They'll be united in loot, forever.

100004192352945_156620584487686: undefined

OLD ANSWER

Use limit, offset, since and until parameters to achieve your goal.

Refer: http://developers.facebook.com/docs/reference/api/

Paging

When querying connections, there are several useful parameters that enable you to filter and page through connection data:

limit, offset: https://graph.facebook.com/me/likes?limit=3

until, since (a unix timestamp or any date accepted by strtotime): https://graph.facebook.com/search?until=yesterday&q=orange

The following should get all the posts since last week until yesterday from 21st - 30th message (basically, third page of 10 message per page pagination).

 FB.api(

  '/me/home',

  {

    'since':'last week',

    'limit': '10',

    'offset': '20',

    'until': 'yesterday'

  }, 

  getPosts

);

I've just tested, it works. I have used limit=4, which is page-size kind of thing. So, when I fetch data since Feb 02, 2011 (Unix Time Stamp: 1296626400) till today using this

https://graph.facebook.com/me/home?access_token=[AUTH_TOKEN]&since=1296626400&limit=4

It returns the data, plus it also return URL to go to next page

{

   data: [

      <ARRAY OF POSTS HERE>

   ],

   paging: {

      previous: https://graph.facebook.com/me/home?access_token=[NEW_AUTH_TOKEN]&since=1298026753&limit=4,

      next: https://graph.facebook.com/me/home?access_token=[NEW_AUTH_TOKEN]&limit=4&until=1298023222

   }

}

You can safely use previous and next attributes of the JSON object to jump to next page (or previous page). This seems to be the easiest way to do.

By the way, u00257C needed to be converted to | to get this to work.