如何使用 Facebook 的 API 检查用户是否喜欢我的 Facebook 页面或 URL

小开

最佳答案

I tore my hair out over this one too. Your code only works if the user has granted an extended permission for that which is not ideal.

Here's another approach.

In a nutshell, if you turn on the OAuth 2.0 for Canvas advanced option, Facebook will send a $_REQUEST['signed_request'] along with every page requested within your tab app. If you parse that signed_request you can get some info about the user including if they've liked the page or not.

function parsePageSignedRequest() {
if (isset($_REQUEST['signed_request'])) {
$encoded_sig = null;
$payload = null;
list($encoded_sig, $payload) = explode('.', $_REQUEST['signed_request'], 2);
$sig = base64_decode(strtr($encoded_sig, '-_', '+/'));
$data = json_decode(base64_decode(strtr($payload, '-_', '+/'), true));
return $data;
}
return false;
}
if($signed_request = parsePageSignedRequest()) {
if($signed_request->page->liked) {
echo "This content is for Fans only!";
} else {
echo "Please click on the Like button to view this tab!";
}
}

小开

i use jquery to send the data when the user press the like button.

<script>
window.fbAsyncInit = function() {
FB.init({appId: 'xxxxxxxxxxxxx', status: true, cookie: true,
xfbml: true});


FB.Event.subscribe('edge.create', function(href, widget) {
$(document).ready(function() {


var h_fbl=href.split("/");
var fbl_id= h_fbl[4];




$.post("http://xxxxxx.com/inc/like.php",{ idfb:fbl_id,rand:Math.random() } )


}) });
};


</script>

Note:you can use some hidden input text to get the id of your button.in my case i take it from the url itself in "var fbl_id=h_fbl[4];" becasue there is the id example: url: http://mywebsite.com/post/22/some-tittle

so i parse the url to get the id and then insert it to my databse in the like.php file. in this way you dont need to ask for permissions to know if some one press the like button, but if you whant to know who press it, permissions are needed.

小开

You can use (PHP)

$isFan = file_get_contents("https://api.facebook.com/method/pages.isFan?format=json&access_token=" . USER_TOKEN . "&page_id=" . FB_FANPAGE_ID);

That will return one of three:

string true string false json
formatted response of error if token
or page_id are not valid

I guess the only not-using-token way to achieve this is with the signed_request Jason Siffring just posted. My helper using PHP SDK:

function isFan(){
global $facebook;
$request = $facebook->getSignedRequest();
return $request['page']['liked'];
}

小开

You can do it in JavaScript like so (Building off of @dwarfy's response to a similar question):

<html>
<head>
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
<style type="text/css">
div#container_notlike, div#container_like {
display: none;
}
</style>
</head>
<body>
<div id="fb-root"></div>
<script>
window.fbAsyncInit = function() {
FB.init({
appId      : 'YOUR_APP_ID', // App ID
channelUrl : 'http(s)://YOUR_APP_DOMAIN/channel.html', // Channel File
status     : true, // check login status
cookie     : true, // enable cookies to allow the server to access the session
xfbml      : true  // parse XFBML
});


FB.getLoginStatus(function(response) {
var page_id = "YOUR_PAGE_ID";
if (response && response.authResponse) {
var user_id = response.authResponse.userID;
var fql_query = "SELECT uid FROM page_fan WHERE page_id = "+page_id+"and uid="+user_id;
FB.Data.query(fql_query).wait(function(rows) {
if (rows.length == 1 && rows[0].uid == user_id) {
console.log("LIKE");
$('#container_like').show();
} else {
console.log("NO LIKEY");
$('#container_notlike').show();
}
});
} else {
FB.login(function(response) {
if (response && response.authResponse) {
var user_id = response.authResponse.userID;
var fql_query = "SELECT uid FROM page_fan WHERE page_id = "+page_id+"and uid="+user_id;
FB.Data.query(fql_query).wait(function(rows) {
if (rows.length == 1 && rows[0].uid == user_id) {
console.log("LIKE");
$('#container_like').show();
} else {
console.log("NO LIKEY");
$('#container_notlike').show();
}
});
} else {
console.log("NO LIKEY");
$('#container_notlike').show();
}
}, {scope: 'user_likes'});
}
});
};


// Load the SDK Asynchronously
(function(d){
var js, id = 'facebook-jssdk'; if (d.getElementById(id)) {return;}
js = d.createElement('script'); js.id = id; js.async = true;
js.src = "//connect.facebook.net/en_US/all.js";
d.getElementsByTagName('head')[0].appendChild(js);
}(document));
</script>


<div id="container_notlike">
YOU DON'T LIKE ME :(
</div>


<div id="container_like">
YOU LIKE ME :)
</div>


</body>
</html>

Where the channel.html file on your server just contains the line:

 <script src="//connect.facebook.net/en_US/all.js"></script>

There is a little code duplication in there, but you get the idea. This will pop up a login dialog the first time the user visits the page (which isn't exactly ideal, but works). On subsequent visits nothing should pop up though.

小开

Though this post has been here for quite a while, the solutions are not pure JS. Though Jason noted that requesting permissions is not ideal, I consider it a good thing since the user can reject it explicitly. I still post this code, though (almost) the same thing can also be seen in another post by ifaour. Consider this the JS only version without too much attention to detail.

The basic code is rather simple:

FB.api("me/likes/SOME_ID", function(response) {
if ( response.data.length === 1 ) { //there should only be a single value inside "data"
console.log('You like it');
} else {
console.log("You don't like it");
}
});

ALternatively, replace me with the proper UserID of someone else (you might need to alter the permissions below to do this, like friends_likes) As noted, you need more than the basic permission:

FB.login(function(response) {
//do whatever you need to do after a (un)successfull login
}, { scope: 'user_likes' });