Facebook API callback on response

I have a problem with the Facebook API. I may not be g开发者_如何转开发oing the about this the best way, but here is what I've got.

I have a array of request_ids, which I need to convert to user Ids. I have a while loop which queries the request ids and gets the user id.

function (response) {
    var requestsToSend = new Array();
    var i = 0;

    while (i < response.request_ids.length)
    {
        FB.api('/'+response.request_ids[i], function(res){
            requestsToSend[i] = res['to']['id'];
        });
        i++;
    }
    console.log(requestsToSend[0], requestsToSend[1], requestsToSend[2], requestsToSend[3]);
}

This works fine. However, when I echo the returned ids (console.log) they are undefined, because the FB.api hasn't yet returned the values/responses.

Is there any way to fire the console.log only once the FB.api has returned values? I don't really want to set a timer to fire the function.

Put your console.log call in the response function:

function (response) {
    var requestsToSend = new Array();
    var i = 0;
    while(i < response.request_ids.length) {
        FB.api('/'+response.request_ids[i], function(res){
            requestsToSend[i] = res['to']['id'];
            console.log(requestsToSend[i]);
        });
        i++; 
    }       
}

Iv fixed the issue but not very happy with the solution

    function (response) {

            var requestsToSend = new Array();
            var i = 0;
            var arry = new Array();


                        FB.api('/'+response.request_ids[0], function(res){
                            if(typeof res['to'] != 'undefined'){
                                useResults(res['to']['id']);
                            }
                        });

                        FB.api('/'+response.request_ids[1], function(res){
                            if(typeof res['to'] != 'undefined'){
                                useResults(res['to']['id']);
                            }
                        });

                        FB.api('/'+response.request_ids[2], function(res){
                            if(typeof res['to'] != 'undefined'){
                                useResults(res['to']['id']);
                            }
                        });

                        FB.api('/'+response.request_ids[3], function(res){
                            if(typeof res['to'] != 'undefined'){                
                                useResults(res['to']['id']);
                            }
                        });

                function useResults(value){
                    arry.push(value);
                    timeToFire(arry);
                }

                function timeToFire(arry){

                    if(arry.length == response.request_ids.length){
                        //console.log(arry);
                        playTheGame(arry[0], arry[1], arry[2], arry[3]);
                    }
                }
        }