I am in the process of integrating Google+ sign in with my site, which also lets users sign in with Twitter and Facebook. The sign in page of the site therefore has 3 button
Our AngularJS solution was:
$scope.$on('event:google-plus-signin-success', function (event, authResult) { if( authResult.status.method !== "AUTO"){ onGoogleLogIn(authResult[settings.configKeys.googleResponseToken]); } });