blocks|key|1921596|text|我也为这件事绞尽脑汁。只有当用户为不理想的内容授予扩展权限时，您的代码才会起作用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1921597|Here's+another+approach.|offset|length|1921598|简而言之，如果你打开了画布的OAuth+2.0高级选项，Facebook将会在你的标签应用程序中请求的每个页面上发送一个$_REQUEST['signed_request']。如果解析该signed_request，您可以获得有关用户的一些信息，包括他们是否喜欢该页面。|style|CODE|1921599|function+parsePageSignedRequest()+{
++++if+(isset($_REQUEST['signed_request']))+{
++++++$encoded_sig+=+null;
++++++$payload+=+null;
++++++list($encoded_sig,+$payload)+=+explode('.',+$_REQUEST['signed_request'],+2);
++++++$sig+=+base64_decode(strtr($encoded_sig,+'-_',+'%2B/'));
++++++$data+=+json_decode(base64_decode(strtr($payload,+'-_',+'%2B/'),+true));
++++++return+$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!";
++++}
++}|code-block|syntax|javascript|1921600|entityMap|0|LINK|mutability|MUTABLE|url|http://www.chilipepperdesign.com/2011/02/15/reveal-fan-gate-like-gate-facebook-iframe-tab-tutorial-with-php^0|0|0|O|0|0|E|9|1O|R|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@$D|Y|E|Z|1|10]]|A|$]]|$1|F|3|G|5|6|7|11|8|@$D|12|E|13|H|I]|$D|14|E|15|H|I]]|9|@]|A|$]]|$1|J|3|K|5|L|7|16|8|@]|9|@]|A|$M|N]]|$1|O|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]]]

<p>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.</p>

<p><a href="http://www.chilipepperdesign.com/2011/02/15/reveal-fan-gate-like-gate-facebook-iframe-tab-tutorial-with-php" rel="noreferrer">Here's another approach.</a></p>

<p>In a nutshell, if you turn on the <code>OAuth 2.0</code> for Canvas advanced option, Facebook will send a <code>$_REQUEST['signed_request']</code> 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.</p>

<pre><code>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-&gt;page-&gt;liked) {
      echo "This content is for Fans only!";
    } else {
      echo "Please click on the Like button to view this tab!";
    }
  }
</code></pre>


blocks|key|4803141|text|当用户按下like按钮时，我使用jquery发送数据。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4803142|<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>|code-block|syntax|javascript|4803143|注意:您可以使用一些隐藏的输入文本来获取您的button.in的id我的情况是从"var+fbl_id=h_fbl4;“中的url本身获取的，因为这里有id示例:+url：http://mywebsite.com/post/22/some-tittle|offset|length|4803144|因此，我解析url以获得id，然后将其插入到我的数据库中的like.php文件中。在这种方式下，你不需要请求权限来知道是否有人按了like按钮，但如果你想知道是谁按下了它，就需要权限。|4803145|entityMap|0|LINK|mutability|MUTABLE|url|http://mywebsite.com/post/22/some-tittle^0|0|0|2E|14|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@$I|X|J|Y|1|Z]]|A|$]]|$1|K|3|L|5|6|7|10|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

<p>i use jquery to send the data when the user press the like button.</p>

<pre><code>&lt;script&gt;
  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() } )

}) });
  };

&lt;/script&gt;
</code></pre>

<p>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:
<a href="http://mywebsite.com/post/22/some-tittle" rel="nofollow">http://mywebsite.com/post/22/some-tittle</a></p>

<p>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.</p>


blocks|key|1921633|text|您可以使用(PHP)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1921634|$isFan+=+file_get_contents("https://api.facebook.com/method/pages.isFan?format=json&access_token="+.+USER_TOKEN+.+"&page_id="+.+FB_FANPAGE_ID);|code-block|syntax|javascript|1921635|这将返回以下三个之一：|1921636|1921637|string+true+string+false+json|unordered-list-item|1921638|如果token|1921639|或page_id无效，则返回错误的格式|1921640|1921641|我想唯一不使用token的方法就是使用Jason+Siffring刚刚发布的signed_request。我的助手使用PHP+SDK：|1921642|function+isFan(){
++++global+$facebook;
++++$request+=+$facebook->getSignedRequest();
++++return+$request['page']['liked'];
}|1921643|entityMap^0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Y|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Z|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|10|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|11|8|@]|9|@]|A|$]]|$1|M|3|N|5|L|7|12|8|@]|9|@]|A|$]]|$1|O|3|P|5|L|7|13|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|14|8|@]|9|@]|A|$]]|$1|R|3|S|5|6|7|15|8|@]|9|@]|A|$]]|$1|T|3|U|5|D|7|16|8|@]|9|@]|A|$E|F]]|$1|V|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|W|$]]

<p>You can use (PHP)</p>

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

<p>That will return one of three:</p>

<ul>
<li>string true string false json</li>
<li>formatted response of error if token</li>
<li>or page_id are not valid</li>
</ul>

<p>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:</p>

<pre><code>function isFan(){
    global $facebook;
    $request = $facebook-&gt;getSignedRequest();
    return $request['page']['liked'];
}
</code></pre>


blocks|key|3203630|text|你可以像这样在JavaScript中做到这一点(基于@dwarfy's+response+to+a+similar+question构建)：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3203631|<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+=+"%2Bpage_id%2B"and+uid="%2Buser_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+=+"%2Bpage_id%2B"and+uid="%2Buser_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>|code-block|syntax|javascript|3203632|其中，服务器上的channel.html文件只包含一行：|3203633|+<script+src="//connect.facebook.net/en_US/all.js"></script>|3203634|这里面有一些代码重复，但是你明白我的意思。这将在用户第一次访问该页面时弹出一个登录对话框(这并不是很理想，但确实有效)。但在随后的访问中，应该不会弹出任何内容。|3203635|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/6246449/facebook-how-to-check-if-user-has-liked-page-and-show-content/6314568#6314568^0|Q|14|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@$A|X|B|Y|1|Z]]|C|$]]|$1|D|3|E|5|F|7|10|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|11|8|@]|9|@]|C|$]]|$1|K|3|L|5|F|7|12|8|@]|9|@]|C|$G|H]]|$1|M|3|N|5|6|7|13|8|@]|9|@]|C|$]]|$1|O|3|-4|5|6|7|14|8|@]|9|@]|C|$]]]|P|$Q|$5|R|S|T|C|$U|V]]]]

<p>You can do it in JavaScript like so (Building off of <a href="https://stackoverflow.com/questions/6246449/facebook-how-to-check-if-user-has-liked-page-and-show-content/6314568#6314568">@dwarfy's response to a similar question</a>):</p>

<pre><code>&lt;html&gt;
  &lt;head&gt;
    &lt;script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"&gt;&lt;/script&gt;
    &lt;style type="text/css"&gt;
      div#container_notlike, div#container_like {
        display: none;
      }
    &lt;/style&gt;
  &lt;/head&gt;
  &lt;body&gt;
    &lt;div id="fb-root"&gt;&lt;/div&gt;
    &lt;script&gt;
      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 &amp;&amp; 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 &amp;&amp; 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 &amp;&amp; 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 &amp;&amp; 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));
    &lt;/script&gt;

    &lt;div id="container_notlike"&gt;
      YOU DON'T LIKE ME :(
    &lt;/div&gt;

    &lt;div id="container_like"&gt;
      YOU LIKE ME :)
    &lt;/div&gt;

  &lt;/body&gt;
&lt;/html&gt;
</code></pre>

<p>Where the channel.html file on your server just contains the line:</p>

<pre><code> &lt;script src="//connect.facebook.net/en_US/all.js"&gt;&lt;/script&gt;
</code></pre>

<p>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.</p>


blocks|key|1921670|text|虽然这篇文章已经在这里发布了很长一段时间，但解决方案并不是纯JS。尽管Jason指出请求权限并不理想，但我认为这是一件好事，因为用户可以明确地拒绝它。我仍然会发布这段代码，尽管(几乎)在another+post+by+ifaour中也可以看到同样的事情。考虑到这是JS的唯一版本，没有太多关注细节。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1921671|基本代码相当简单：|1921672|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");
++++}
});|code-block|syntax|javascript|1921673|ALternatively，请将me替换为其他人的适当UserID+(您可能需要更改下面的权限才能执行此操作，如friends_likes)。如上所述，您需要的不只是基本权限：|style|CODE|1921674|FB.login(function(response)+{
++++//do+whatever+you+need+to+do+after+a+(un)successfull+login+++++++++
},+{+scope:+'user_likes'+});|1921675|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/5100287/368003|1|https://stackoverflow.com/a/4971560/368003^0|Z|5|0|2L|M|1|0|0|0|G|2|1K|D|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@$A|11|B|12|1|13]|$A|14|B|15|1|16]]|C|$]]|$1|D|3|E|5|6|7|17|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|18|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|19|8|@$A|1A|B|1B|M|N]|$A|1C|B|1D|M|N]]|9|@]|C|$]]|$1|O|3|P|5|H|7|1E|8|@]|9|@]|C|$I|J]]|$1|Q|3|-4|5|6|7|1F|8|@]|9|@]|C|$]]]|R|$S|$5|T|U|V|C|$W|X]]|Y|$5|T|U|V|C|$W|Z]]]]

<p>Though this post has been here for quite a while, the solutions are not pure JS. Though <a href="https://stackoverflow.com/a/5100287/368003">Jason</a> 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 <a href="https://stackoverflow.com/a/4971560/368003">another post by ifaour</a>. Consider this the JS only version without too much attention to detail. </p>

<p>The basic code is rather simple:</p>

<pre><code>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");
    }
});
</code></pre>

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

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


<p>I think I'm going crazy. I can't get it to work.<br>
I simply want to check if a user has liked my page with javascript in an <code>iFrame</code> app.</p>

<pre><code>FB.api({
    method:     "pages.isFan",
    page_id:        my_page_id,
},  function(response) {
        console.log(response);
        if(response){
            alert('You Likey');
        } else {
            alert('You not Likey :(');
        }
    }
);
</code></pre>

<p>This returns: False<br>
But I'm a fan of my page so shouldn't it return true?!</p>


How to check if a user likes my Facebook Page or URL using Facebook's API

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我想我快要疯了。我不能让它工作。我只是想检查一下用户是否喜欢我在iFrame应用程序中使用javascript的页面。FB.api({    method:     "pages.isFan",    page_id:        my_page_id,},  function(response) {        ...

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