<script type="text/javascript"
language="javascript">
window.fbAsyncInit
= function () {
FB.init({
appId: 'app API',
status: true, // check login
status
cookie: true, // enable cookies
to allow the server to access the session
xfbml: true, // parse XFBML
oauth: true
});
// Here we
subscribe to the auth.authResponseChange JavaScript event. This event is fired
// for any
authentication related change, such as login, logout or session refresh. This
means that
// whenever
someone who was previously logged out tries to log in again, the correct case
below
// will be
handled.
FB.Event.subscribe('auth.authResponseChange', function
(response) {
// Here we
specify what we do with the response anytime this event occurs.
if
(response.status === 'connected') {
// The response object is returned with a status field
that lets the app know the current
// login status
of the person. In this case, we're handling the situation where they
// have logged in to the app.
testAPI();
} else if (response.status === 'not_authorized')
{
//
In this case, the person is logged into Facebook, but not into the app, so we
call
// FB.login() to
prompt them to do so.
//
In real-life usage, you wouldn't want to immediately prompt someone to login
//
like this, for two reasons:
// (1)
JavaScript created popup windows are blocked by most browsers unless they
// result from
direct interaction from people using the app (such as a mouse click)
//
(2) it is a bad experience to be continually prompted to login upon page load.
FB.login();
} else {
// In this case, the person is not
logged into Facebook, so we call the login()
//
function to prompt them to do so. Note that at this stage there is no
indication
// of
whether they are logged into the app. If they aren't then they'll see the Login
//
dialog right after they log in to Facebook.
// The
same caveats as above apply to the FB.login() call here.
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() {
console.log('Welcome! Fetching
your information.... ');
FB.api('/me',
function(response) {
console.log('Good
to see you, ' + response.name + '.');
});
};
</script>
<div class="fb-login-button"
data-max-rows="1"
data-size="large"
data-show-faces="false"
data-auto-logout-link="true" data-scope="offline_access,user_status,publish_stream,email,read_stream,manage_pages,user_groups">
</div>
Settings
In
addition to the settings above, you can also change the following:
Setting
|
HTML5 Attribute
|
Description
|
Options
|
auto_logout_link
|
data-auto-logout-link
|
If enabled, the button will change to a logout button when the user is
logged in.
|
false, true
|
max_rows
|
data-max-rows
|
The maximum number of rows of profile photos in the Facepile whenshow_faces is enabled. The actual number of rows
shown may be shorter if there aren't enough faces to fill the number you
specify.
|
int
|
onlogin
|
onlogin
|
A JavaScript function to trigger when the login process is complete.
|
Function
|
scope
|
data-scope
|
The list of permissions to request during login.
|
|
size
|
data-size
|
Picks one of the size options for the button.
|
small,medium,large,xlarge
|
show_faces
|
data-show-faces
|
Determines whether a Facepile of logged-in friends is shown below the
button. When this is enabled, a logged-in user will only see the Facepile,
and no login or logout button.
|
false, true
|
