Uncaught ReferenceError: FB is not defined
facebook, facebook-javascript-sdk, javascript, jquery, php
Solution
See this thread: FB is not defined in Facebook Login.
You are trying to use `FB` right after your button, and it's not defined yet:
<fb:like href="http://mydomain.it/" layout="button_count" action="like" show_faces="false" share="false"></fb:like>
<script>
FB.Event.subscribe(...
^--- FB isn't defined yet!
Move that `FB.Event.subscribe` code inside your `window.fbAsyncInit` function, where you have that comment "Additional initialization code"
Problem
I know this question is asked frequently, but I have not found the solution. I use this code: open the html tag with ``` <html xmlns="http://www.w3.org/1999/xhtml" xmlns:fb="http://ogp.me/ns/fb#"> ``` in the index immediately after the opening tag I entered this ``` <div id="fb-root"></div> <script> window.fbAsyncInit = function() { // init the FB JS SDK FB.init({ appId : 'MY_APP_ID', // App ID from the app dashboard status : true, // Check Facebook Login status xfbml : true // Look for social plugins on the page }); // Additional initialization code such as adding Event Listeners goes here }; // Load the SDK asynchronously (function(){ // If we've already installed the SDK, we're done if (document.getElementById('facebook-jssdk')) {return;} // Get the first script element, which we'll use to find the parent node var firstScriptElement = document.getElementsByTagName('script')[0]; // Create a new script element and set its id var facebookJS = document.createElement('script'); facebookJS.id = 'facebook-jssdk'; // Set the new script's source to the source of the Facebook JS SDK facebookJS.src = '//connect.facebook.net/it_IT/all.js'; // Insert the Facebook JS SDK into the DOM firstScriptElement.parentNode.insertBefore(facebookJS, firstScriptElement); }()); </script> ``` finally, the button ``` <fb:like href="http://mydomain.it/" layout="button_count" action="like" show_faces="false" share="false"></fb:like> <script> FB.Event.subscribe('edge.create', function(href, widget) { alert('Ti piace ' + href); }); </script> ``` the like works, but does not open the alert and I got this error in console. ``` Uncaught ReferenceError: FB is not defined ``` Any solutions?