Login into my website with Facebook account - email

Question

I am trying to incorporate the facebook login button into my website's homepage. I have connected it with an app, so i have the app id and secret, if the user is already registered.
I have used the JavaScript SDK from facebook but when I press the facebook's login button, after the authorization, nothing happens and my website's homepage is shown again. Does anyone know how to get the user's email from the Javascript SDK? I want to redirect to another page after login, but after login it stays on that page only.
<div id="fb-root"></div>
<script>
window.fbAsyncInit = function()
{
FB.init({
appId : '178124332351909', // App ID
channelUrl : 'channel.html', // Channel File
status : true, // check login status
cookie : true, // enable cookies to allow the server to access the session
xfbml : true // parse XFBML
});
FB.Event.subscribe('auth.authResponseChange', function(response)
{
if (response.status === 'connected')
{
alert("connected");
testAPI();
}
else if (response.status === 'not_authorized')
{
alert("nt connected");
FB.login();
}
else
{
alert("else");
FB.login();
}
});
};
// Load the SDK asynchronously
(function(d){
var js, id = 'facebook-jssdk', ref = d.getElementsByTagName('script')[0];
if (d.getElementById(id)) {return;}
js = d.createElement('script'); js.id = id; js.async = true;
js.src = "//connect.facebook.net/en_US/all.js";
ref.parentNode.insertBefore(js, ref);
}(document));
// Here we run a very simple test of the Graph API after login is successful.
// This testAPI() function is only called in those cases.
function testAPI()
{
alert("in testapi");
console.log('Welcome! Fetching your information.... ');
FB.api('/me', function(response)
{
console.log('Good to see you, ' + response.name + '.');
});
}
</script>
Reference : Add the login code
Please help how to redirect to another page.

Answer 1

For asking the permission for email, replace Fb.login()with:
FB.login(function(response)
{
if(response.status == 'connected'){
alert('I am connected')
}
},{scope: 'email'});
For redirecting the user to other page after successful login, simply write the redirection code in the testAPI() function:
function testAPI()
{
alert("in testapi");
console.log('Welcome! Fetching your information.... ');
FB.api('/me', function(response)
{
console.log('Good to see you, ' + response.name + '.');
});
window.location="http://www.newlocation.com"; // HERE
}

Answer 2

There could be 1 reason:
when you click on the login button>> it tries to open the pop- up window>> if "allow pop up is blocked">> then it will just refresh the page, and user will think that nothing is happening.
If you want to get users email then you can pass it as a "perms" parameter something like this.
<div class="fb-login-button" onclick="fbLoginClick();" perms="email"><div>