getLoginStatus

gistfile1.js

function (a, b) {
    if (!FB._apiKey) {
        FB.log('FB.getLoginStatus() called before calling FB.init().');
        return;
    }
    if (a) if (!b && FB.Auth._loadState == 'loaded') {
        if (FB._oauth) {
            a({
                status: FB._userStatus,
                authResponse: FB._authResponse
            });
        } else a({
            status: FB._userStatus,
            session: FB._session
        });
        return;
    } else FB.Event.subscribe('FB.loginStatus', a);
    if (!b && FB.Auth._loadState == 'loading') return;
    FB.Auth._loadState = 'loading';
    var c = function (d) {
            FB.Auth._loadState = 'loaded';
            FB.Event.fire('FB.loginStatus', d);
            FB.Event.clear('FB.loginStatus');
        };
    if (FB.UA.mobile() && window.postMessage && window.localStorage) {
        FB.Auth.staticAuthCheck(c);
    } else if (FB._oauth) {
        FB.ui({
            method: 'login.status',
            display: 'none',
            domain: location.hostname
        }, c);
    } else FB.ui({
        method: 'auth.status',
        display: 'hidden'
    }, c);
}