Facebook SDK 2.8 doesnot give email address - facebook

Question

I am trying to implement FacbookSDK 2.8 for my website and below is the simplified version of the code.
<button onclick="logout()">Logout</button>
<button onclick="login()">LogIn</button>
<script>
(function(d, s, id) {
var js, fjs = d.getElementsByTagName(s)[0];
if (d.getElementById(id)) return;
js = d.createElement(s);
js.id = id;
js.src = "//connect.facebook.net/en_US/sdk.js";
fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'facebook-jssdk'));
setTimeout(() => {
window.fbAsyncInit = () => {
FB.init({
appId: 'xxxxxxx', //My app id here
cookie: true, // enable cookies to allow the server to access
// the session
xfbml: true, // parse social plugins on this page
version: 'v2.8' // use graph api version 2.8
});
checkFBLoginStatus();
}
})
function checkFBLoginStatus() {
FB.getLoginStatus((response) => {
console.log(response)
});
}
function logout() {
FB.logout(function(response) {
console.log(response)
})
}
function login() {
FB.login(function(response) {
console.log(response)
FB.api('/me?fields=id,email,name', function(response) {
console.log(JSON.stringify(response));
});
}, {
scope: 'email'
})
}
function onLoginSuccess() {
FB.getLoginStatus(function(response) {
console.log(response)
})
}
</script>
I am getting the response on logout and login
Here are my questions
On FB.api call i am getting only ID and Name whereas i need user email to set as an unique user identifier.
When is the condition i can achieve not_authorized. I am getting status 'connected' if i login and 'unknown' if i logout. I am not able to reproduce the condition un_authorized, so that i could code for it.

Answer 1

You should use the ID of the user to identify him, not the email. Users do not have to have an email, they can also use their phone number to login. Make sure you get asked for the email permission in the login process/popup. Also, use this form instead:
FB.api('/me', {fields: 'id,email,name'}, function(response) {
console.log(JSON.stringify(response));
});