从登录获取Facebook电子邮件地址

Question

I'm currently using hello.js to have users create accounts and sign in with facebook. However, I need to use the user's facebook email address since this is used to send the user a confirmation of purchase.

Because the user can choose to not allow us to have his/her email address, I am left with an empty slot, thus the user never receiving confirmation of orders or downloadable files purchased through the system.

I've tried using the facebook user ID, but the email format is username@facebook.com . I can retrieve the user's ID and email (if allowed), but not the username.

Can we retrieve this and if so, how ?

Answer 1

I scratched my head too on how to fetch emails from FB, cause the response object in the documentation [ https://developers.facebook.com/docs/facebook-login/web] paragraph Make API calls looks different from what it is returned.

You may want to look at: [ https://developers.facebook.com/docs/javascript/reference/FB.api] and add parameters.

Here using version 2.5:

  window.fbAsyncInit = function() {
FB.init({
  appId      : {your-app-id},
  status : true,
  cookie : true,
  xfbml      : true,
  oauth : true,
  version    : 'v2.5'
});

Following the documentation, once logged:

FB.api('/me', function(response) {console.log(response) })

response has only _ID and name despite permissions are granted.

You can retrieve the email, if existing , by also specifying fields parameters against FB.api :

FB.api('/me?fields=id,name,email', function(response) { console.log(response); });