FB_Connect.js

// This is called with the results from from FB.getLoginStatus().
function statusChangeCallback(response) {
	console.log('statusChangeCallback');
	console.log(response);
	// The response object is returned with a status field that lets the
	// app know the current login status of the person.
	// Full docs on the response object can be found in the documentation
	// for FB.getLoginStatus().
	if (response.status === 'connected') {
		// Logged into your app and Facebook.
		testAPI();
	} else if (response.status === 'not_authorized') {
		// The person is logged into Facebook, but not your app.
		console.log('please log in')

	} else {
		// The person is not logged into Facebook, so we're not sure if
		// they are logged into this app or not.
		console.log('person not logged into facebook')

	}
}

// This function is called when someone finishes with the Login
// Button.  See the onlogin handler attached to it in the sample
// code below.
function checkLoginState() {
	FB.getLoginStatus(function(response) {
		statusChangeCallback(response);
	});
}

window.fbAsyncInit = function() {
FB.init({
	appId      : '412937365558458',
	cookie     : true,  // enable cookies to allow the server to access
											// the session
	xfbml      : true,  // parse social plugins on this page
	version    : 'v2.2' // use version 2.2
});

// Now that we've initialized the JavaScript SDK, we call
// FB.getLoginStatus().  This function gets the state of the
// person visiting this page and can return one of three states to
// the callback you provide.  They can be:
//
// 1. Logged into your app ('connected')
// 2. Logged into Facebook, but not your app ('not_authorized')
// 3. Not logged into Facebook and can't tell if they are logged into
//    your app or not.
//
// These three cases are handled in the callback function.

FB.getLoginStatus(function(response) {
	statusChangeCallback(response);
});

};

// Load the SDK asynchronously
(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'));

// Here we run a very simple test of the Graph API after login is
// successful.  See statusChangeCallback() for when this call is made.
function testAPI() {
	FB.api('/me', function(response) {
		console.log(response);

		var id = response.id;
		var photo = "graph.facebook.com/"+response.id+"/picture";
		var name = response.name;
		if (fbStatus == 1) {
			$.post('/register/facebook', {photo: photo, name: name, id: id}, function(data) {
				window.location.assign('/dashboard' + data);
			});
		}
	});
}