How to authenticate to Facebook without redirect? - facebook

Question

Could suggest a way to authorize my web application in Facebook to get access_token with no need for redirect? I found out that this in fact is possible with deprecated Facebook REST API, but I cannot register new application to use it.
Regards,
ToM

Answer 1

You can only accomplish this with the facebook javascript library. With the PHP library, you are stuck with redirecting them to facebook... If they cancel out on facebook, they are now off your site.
With the javascript library, you get a modal window that if they cancel out of, just stay on your page.
Here's a short blurb on how to make the javascript button appear on your page and do a simple login check:
<div id="fb-root"></div>
<script>
window.fbAsyncInit = function() {
// Initialize Facebook Connect
FB.init({
appId : 'YOUR_FACEBOOK_APP_ID_HERE',
status : false, // Check login status
cookie : true, // Enable cookies to allow the server to access the session
xfbml : true, // Parse XFBML
oauth : true
});
};
// Get Facebook Connect JS and append it to the DOM
(function() {
var e = document.createElement('script');
e.async = true;
e.src = document.location.protocol+'//connect.facebook.net/en_US/all.js#xfbml=1';
document.getElementById('fb-root').appendChild(e);
}());
function fbLoginCheck(response){
if(response.status != 'unknown'){
//reload or redirect once logged in...
window.location.reload();
}
}
</script>
<a class="fb_button fb_button_medium"
onclick='FB.login(fbLoginCheck,{ scope: "user_about_me,user_location,user_birthday,email,publish_stream"})'>
<span class="fb_button_text">Join with Facebook</span></a>