Facebook API: Suggest page to friends and view which are were selected

I am developing an application which is based on user challenges. The app also requires a Facebook account to play.

I want a user to be able to select a bunch of friends he wants to challenge and send them an "invitation". But besides this, I need to find which friends did the user invite in order to save them to my database and "prepare" the challenge.

I managed to do the select-friends-dialog using this, but have no idea how to retrieve the selected users. Also, does this work on non-canvas Facebook applications? As I read that page, I am not sure whether it will work for my non-canvas application.

Here is my select-friends-dialog code:

function challengeFriends(){
FB.ui({
    method: 'apprequests',
    message: 'message",
    title: 'title'
});

}

Any help is highly appreciated! Th开发者_StackOverflow社区ank you.

I've written a tutorial that covers what you are asking for and other aspects of the Request dialog: How To: Send An Application Request Using The Facebook Graph API

The idea is to capture the request ids from the callback and save them in your DB, and within the request itself you can find the invitee id (friend id):

FB.ui({
    method: 'apprequests',
    message: 'Check out this application!',
    title: 'Send your friends an application request',
},
function (response) {
    if (response && response.request_ids) {
        var requests = response.request_ids.join(',');
        $.post('handle_requests.php',{uid: <?php echo $uid; ?>, request_ids: requests},function(resp) {
        });
    } else {
        alert('canceled');
    }
});