FB.Event.subscribe('auth.login') won't trigger everytime ? - facebook

Question

<div id="fb-root"></div>
<script>
window.fbAsyncInit = function() {
FB.init({
appId : 'MY_APP_ID',
status : true,
cookie : true,
xfbml : true
});
FB.Event.subscribe('auth.login', function(response) {
$.ajax({
url: "http://example.com/fbconnect",
success: function(){
window.location.reload();
}
});
});
};
(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 class="fb-login-button" data-perms="email,user_birthday,user_hometown,user_location">Login with Facebook</div>
It's working with only two cases.
1- when a user is NOT logged in and log in to facebook it triggers.
2- when a user is logged in but didn't authorize the app yet it triggers.
the third scenario which is not working is when a user is logged in and He is already authorized the app the FB.Event.subscribe('auth.login) won't trigger !!!

Answer 1

I encountered the same thing as you and I found a function, "getLoginStatus", that might be of interest for you.
When the user is already logged in and has granted your app all the permissions, then there is no need to log in again and therefore the event won't be triggered.
However, if the response of the "getLoginStatus" is "connected" you can do the stuff you want to do when the user is already logged in and has granted your app all the permissions.
The complete script might look something like this:
<script>
window.fbAsyncInit = function() {
FB.init({
appId : 'APPID', // App ID
channelUrl : 'CHANNEL_URL', // 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) {
if (response.status === 'connected') {
// the user is logged in and connected to your
// app, and response.authResponse supplies
// the user's ID, a valid access token, a signed
// request, and the time the access token
// and signed request each expire
var uid = response.authResponse.userID;
var accessToken = response.authResponse.accessToken;
FB.api('/me', function(response) {
if (response.name != undefined ) {
console.log("Welcome, " + response.name);
}
});
} else if (response.status === 'not_authorized') {
// the user is logged in to Facebook,
// but not connected to the app
} else {
// the user isn't even logged in to Facebook.
}
});
// Additional initialization code here
};
// 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>

Answer 2

Got the exact same issue here and it's driving me nuts. Not liking the Facebook Javascript SDK atm.
It's really complex with the status check in FB.init() and makes it even harder when you put facebook comments on the page...
A workaround I just tested is to have your own login button and use the FB.login() method, there you can hook in to the callback (this replaces your code for the auth.login event).
window.fbAsyncInit = function () {
FB.init({
...
});
$('#fb-login-button-custom').show().click(function () {
var scopeList = $(this).data('scope');
FB.login(function (response) {
alert('FB.login callback');
console.log(response);
document.location.href = document.location.pathname + '?fblogin=1';
}, { scope: scopeList });
});
});
That default login event is actually only triggered when the user authorizes your application. So when loging out the user, you could revoke the authorization. But then every time they log in they have to 'allow' the app.

Answer 3

Using FB.Event.subscribe('auth.statusChange', handleStatusChange); will notify you status changes..
hope it helps