i have one problem with facebook landing page. i created facebook landing page through static fbml app but i have one problem with like button, user must like the page before he will navigate to another page.
i want to do same functionality in my landing page,
http://www.facebook.com/BusinessofCinema?v=app_6009294086.
anyone know about this please help me .
thanks inadvance......
At this point you'll probably want to go with iframe based Facebook page tabs instead, now that these have become available and fbml based apps are being phased out. Among other advantages, the signed_request parameter that Facebook sends to an iframe based tab app includes a flag that indicates whether the user is a fan of the page.
Now that iframes are the only way to create new Facebook apps and FBML is being phased out, you need a new way to do it.
When your app URL is loaded, it is passed a signed_request POST parameter. This parameter contains the information you need. However, it is packed and encoded so it requires some manipulation to get the right info out.
First, split the signed_request on the '.' character. The first part is the signature. The second part is the encoded_data
Decode the encoded_data into a JSON string using the URLBase64Decode function equivalent in your server-side programming language
The JSON object contains a node called "page". This contains a node called "liked".
If "liked" is true, the user liked the page and you display the "liked" version of your app. If false, show the "Please like me" version of the site.
The FBML way will continue to work the way you have it live right now, but for anyone building a new Facebook app, this is the way to do.
Related
I'm working on a photo contest fb app to run in a fan page tab. the user should be able to share the photo in order for others to vote for them.
supposing image link in iframe is http://example.com/image.php?id=1 for particular photo, pressing share will share this link through iframe. which leads up to the host app itself.
what I need is sharing the whole fb app tab page url with http://example.com/image.php?id=1 open in its Iframe.
is that possible in any way?
thanks for help.
So to give the “alternative” to #Lix’ answer, which focuses on canvas apps, here the analog way for page tab apps:
For some reason Facebook decided to do things differently for page tab apps – different than with canvas apps, you can not pass just any GET parameters to your app by appending them to the facebook.com address of your app, but you have to use the app_data parameter for that.
You call/link to your app in the form https://www.facebook.com/YourPage?v=app_1234567890&app_data=foo – and whatever you put as value for the parameter app_data, you will find in the signed_request parameter that Facebook POSTs to your app on initial(!) load into the iframe.
So you parse the signed_request (or let f.e. the PHP SDK do that for you), and then you find the app_data value in there. If you want to pass more than one single value, you can f.e. also put JSON-encoded data there – then you have to decode that again after you read the app_data value from the signed request.
The docs just shortly mention the app_data parameter, but the principle itself is quite simple.
Now, when it comes to sharing those links, I found that when you use an address in the above form, Facebook tends to cut the parameters from the URL, and treat the whole link as just a link to your Facebook page – it shows the page’s picture and description, and does not even pass your page tab app along, let alone the app_data parameter.
I found the most reliable way around this is not to link to your page tab on Facebook directly, but instead to a URL of your own app. When the scraper visits it, you deliver the relevant OG information. And when it’s a real user visiting, you redirect them to your page tab app, passing the data you need via the app_data parameter as described above. Redirecting can either be done server-side (info on how to detect the scraper server-side via its User-Agent header), or client-side via JavaScript (which the scraper does not “speak”).
Sure it is. All you have to do is be able to extract the information from your application canvas URL. If your canvas URL is something like this:
https://apps.facebook.com/ImadBakir
Then you could place some more info in there, like this:
https://apps.facebook.com/ImadBakir?photo_id=123
Users will share that link and now in your application, you can parse that photo_id parameter and make the needed HTML changes to display the correct image inside your iframe as the page and application loads.
With regard to parsing the the URL parameters, assuming you'll be doing it with JavaScript, you can read more about it in this post:
How can I get query string values in JavaScript?
I tried googling & checking stackoverflow for the possible solution but haven't found any yet, so would like to bring it up here again.
I have a Facebook page, page has multiple tabs, and one of the tab has a Facebook App (accessed only through the tab, redirect the http://apps.facebook.com/myapp to the page tab)
I have some content (say non-fan content) to be displayed to the user before he likes the page.but, I don't have any way to check if the user has liked the page unless he adds the app & fb documentation has stuff that can give me the required like FQL page_fan, url_like, api(/me/likes/FACEBOOK_PAGE_ID) but each one of this needs an accesstoken (which I cannot get before the user adds the app).
some of the posts on stackover flow says that is not possible without getting the user to add the app. but there are apps like static html, static iframe & others which provides this functionality, how ?
Please advise.
Facebook will POST a signed_request to your server when the user opens the page tab.
This is what you get when you parse the signed_request:
{
"algorithm":"HMAC-SHA256",
"issued_at":1309468031,
"page":{
"id":"xxxxxxxxxxxxxxx",
"liked":true,"admin":true
},
"user":{"country":"fr","locale":"en_US","age":{"min":21}
}
The important part is "page.liked" where you see if the user likes the page.
No permissions and no app authorization is needed for this to work.
Search the web about parsing the signed_request in your favorite web programming language i.e. php.
The Facebook API docs say the parameter, "app_data," should be used to customize tabs within a Facebook Fan Page.
However, when users add our tab to their page, the "app_data" param gets lost every time, meaning the tabs aren't customized per Fan Page as they should be.
For instance, we want this page to get rendered for one client: http://www.facebook.com/apps/application.php?id=198939416792674&sk=app_198939416792674&app_data=15
After the client adds this URL as a tab to his Fan Page, though, the tab URL loses the "app_data" parameter. The page rendered no longer reflects the data specific to this client.
We need the tabs to contain a parameter specific to each Fan Page. We thought "app_data" was the right approach.
Any clues what we're doing wrong?
The best way to do what you trying to achieve is to customise the content based on the page['id'] that is passed to you via a signed request.
We are working on a facebook-app with lots of dynamic pages. As the app is embedded in a tab on a facebook page, the urls contain a get-parameter to address the correct tab/app. We want to implement like- and send-buttons for several pages within our app, but facebook seems to dump all get-parameters from urls within facebook. As the result all like- and send-buttons point to the facebook-page itself instead of the tab.
Does anybody now any workaround? We already tried redirects via an external sefor facebook urls only.rver but facebook seems to evaluate the links on click of the like-/send-button (and seems to follow all sort of redirects).
UPDATE:
Here is an example of a problematic url:
https://www.facebook.com/smartmobil.de?sk=app_171502639574871
UPDATE:
The problem seems to be independant of url get-parameters. It seems that the like-button does not work with any url starting with www.facebook.com
When used in a like-button everything behind the ? will be dumped. This seems to happen for facebook urls only.
Best workaround so far is to point your like buttons at external (non-facebook canvas) urls.
To make this work, you need to do some conditional redirecting to get the user back into your canvas URL. You can either use a client side javascript redirect:
<script>
window.location = 'http://apps.facebook.com/yourcanvasname/foo/bar';
</script>
Or you can do a server side redirect based on the useragent string. Basically, if the useragent contains 'facebookexternalhit' then render a basic HTML page containing OG tags, if not, redirect to the canvas URL.
Doing this means the Facebook sharescraper/linter won't follow any redirects back to the canvas URL, but any user that arrives at your URL will get back to Canvas.
i'm too searching for a solution to control the custom page tab's content through a get parameter (app_data). I still don't have a solution but here at least the reason why all www.facebook.com links are srtiped out of get params. Here at bottom the developer explains why.
Unfortunately I don't think what you are trying to do is possible. Posting a like programmatically requires you to specify a Facebook content ID or alias. This won't work for you because tabs to not seem to have an exposed content ID of their own, and instead use the Page's content ID with an additional parameter which you can't use with the graph.
Liking external links and other content that does not have an ID programmatically is prohibited. With an external URL, the first like of an unrecognised URL creates a new Facebook page for those likes to be represented on (which is the issue I've given up trying to fight), but presumably the presence of your Page's content ID alias (www.facebook.com/smartmobil.de) in the url is making Facebook choose you page rather than creating a new one.
The only suggestion I can think of this late at night is to target an external URL that performs a redirect via Javascript, rather than on the server, but Facebook may be wise to that too and I'm afraid I'm going to bed rather than testing it :)
Ive seen this on a lot of facebook sites. I was wondering how to setup a welcome page and when the person likes that certain page they are then able to see more information about the page.
ie: http://www.facebook.com/BacardiLimon under the welcome tab.
thanks!
Also a related facebook question. Does anyone know how the slide show at the bottom is created in fbml?
<fb:fbml version="1.1">
<fb:visible-to-connection>
Welcome, fans!
blah blah blah...
<fb:else>
NONFANS
</fb:else>
</fb:visible-to-connection>
</fb:fbml>
who knew it was that easy :P
Now that iframes are the only way to create new Facebook apps and FBML is being phased out, you need a new way to do it.
When your app URL is loaded, it is passed a signed_request POST parameter. This parameter contains the information you need. However, it is packed and encoded so it requires some manipulation to get the right info out.
First, split the signed_request on the '.' character. The first part is the signature. The second part is the encoded_data
Decode the encoded_data into a JSON string using the URLBase64Decode function equivalent in your server-side programming language
The JSON object contains a node called "page". This contains a node called "liked".
If "liked" is true, the user liked the page and you display the "liked" version of your app. If false, show the "Please like me" version of the site.