Facebook登录重定向问题

Question

I have a site with a working Facebook login.

The problem is happens when the user comes to the site for the first time (or after clearing cookies).

The user flow is the following:

1. User clicks "Sign Up with Facebook"
2. User is redirected to Facebook authentication
3. If User accepts, he/she is redirected to the 'Sign Up' page.

The problem is that if the person is doing this for the first time, they are always redirected back to the home page.

There are only 2 possible views that can be given for this url

1. The Sign Up page, with only some form data sent as parameters
2. An alert box upon successful DB persistence

Thus, I have ruled out PHP as a possible cause of the redirect.

I have included the JavaScript managing the Facebook interaction.

All other relevant code can be found in the HTML of the page.

The Page can be found at http://trioisrael.com

function fb_login(){
    FB.login(function(response) {

        if (response.authResponse) {
            window.location = "http://trioisrael.com/signup"
            //console.log(response); // dump complete info
            access_token = response.authResponse.accessToken; //get access token
            user_id = response.authResponse.userID; //get FB UID

            FB.api('/me', function(response) {
                user_email = response.email; //get user email
                // you can store this data into your database
            });

        } else {
            //user hit cancel button
            alert('We use facebook to make sure that everyone is really who they say they are');

        }
    }, {
        scope: 'user_photos,user_birthday'
    });
}

Answer 1

Trying to do additional stuff after assigning a new value to window.location (which should be window.location.href, of course) does not make sense.

If you want to do additional stuff after login, do it before redirecting the user somewhere else.