auth.logout is not working in my app using firebase facebook authentication - facebook

Question

I have tried basic steps of Firebase Facebook authentication. So in my app the user can successfully log in using Firebase Facebook authentication. But I have a problem in logout.
I used logout button and bind click event on that, as shown below:
$(function(){
$('#lgout').click(function(){
auth.logout();
});
});
For login I use this code:
var chatRef = new Firebase('https://my-firebase-url');
var auth = new FirebaseSimpleLogin(chatRef, function(error, user) {
if (error) {
// an error occurred while attempting login
alert("please login first");
} else if (user) {
// user authenticated with Firebase
//alert('User ID: ' + user.id + ', Provider: ' + user.provider);
$.ajax({
type: "GET",
url: "https://graph.facebook.com/"+user.id,
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function(data) {
$('#user').text("Welcome "+data.name);
}
});
} else {
// user is logged out
//auth.login('facebook');
}
});
auth.login('facebook');
In login also, I got one problem as you can see in else part I used auth.login('facebook'); that is not working showing error
auth is not defined. But if I used outside of else then it working fine.
Please help me to figure out this problem.

Answer 1

Separate from the issue regarding auth.logout(), you should never call auth.login('facebook'); from within this callback. Rather, it should be called after a user click event, as your browser will prevent the Facebook pop-up from launching.
From https://www.firebase.com/docs/security/simple-login-overview.html:
Third-party authentication methods use a browser pop-up window to
prompt the user to sign-in, approve the application, and return the
user's data to the requesting application. Most modern browsers will
block the opening of this pop-up window unless it was invoked by
direct user action.
For that reason, we recommend that you only invoke the "login()"
method for third-party authentication methods upon user click.