Question

I am currently using the following code to get the email id of the user using my app

function get_id(cb){
    FB.init({
        appId  : .......,
        status : true, // check login status
        cookie : true, // enable cookies to allow the server to access the session
        xfbml  : true // parse XFBML
    });

    FB.login(function(response) {
        if (response.authResponse) {
            var token = response.authResponse.accessToken;
            alert(token);
            accessToken = token;
            FB.api('/me?access_token=' + token + '', function (response) {

                cb(response.email);

            });

        }

     },{scope: 'email'});

    (function(d){
         var js, id = 'facebook-jssdk', ref = d.getElementsByTagName('script')[0];
         if (d.getElementById(id)) {return;}
         js = d.createElement('script'); js.id = id; js.async = true;
         js.src = "//connect.facebook.net/en_US/all.js";
         ref.parentNode.insertBefore(js, ref);
    }(document));


}; // ending of get_id()

get_id(function (email) {
    userID=email;
    alert(email);
});

the current code is in a separate javascript file and this function is called when a button is pressed , I have also included <script src="http://connect.facebook.net/en_US/all.js"></script> in the HTML file . my browser (google chrome) gives me the following error each time I try and access it
“Uncaught ReferenceError: FB is not defined “

I am relatively new to developing Facebook apps , so all the reference I have is the developers page at facebook , I am sure it is a small error but I just cant wrap my head around it , appreciate it if anybody could point out where I could be going wrong

Answer 1

You need to put:

(function(d){
     var js, id = 'facebook-jssdk', ref = d.getElementsByTagName('script')[0];
     if (d.getElementById(id)) {return;}
     js = d.createElement('script'); js.id = id; js.async = true;
     js.src = "//connect.facebook.net/en_US/all.js";
     ref.parentNode.insertBefore(js, ref);
}(document));

out of get_id function. So it was called before you press the button

PS: you don’t need to pass ?access_token= manually – FB JS SDK does that for you