Javascript method isn't returning value

Question

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How to return AJAX response Text?
Variable doesn’t get returned JQuery
AJAX not updating variable

I am having issue with this code:

/**
 * facebook Object*/
var fbObject = new Object();


/**
 * Function to get login status
 * @returns boolean Logged in status
 * */
fbObject.getLoginStatus = function() {
    FB.getLoginStatus(function(response) {
        if (response.status == 'connected') {
              console.log('logged in');
              return true;
            } else {
              console.log('not logged in');
              return false;
            }
    });
}

var status = fbObject.getLoginStatus();

    alert('Status: '+ status);

My problem is that getLoginStatus method isn't returning the value.

Its ***asynchronous***! And you don't `return` anything from the function, so what would you expect? — Bergi, Dec 19 '12 at 14:08
What is the value you are getting for the `response.status`?? — palaѕн, Dec 19 '12 at 14:08
The reason is simple : when getLoginStatus ends, the distant server hasn't received the question nor answered. So you **can't** get something returned. — Denys Séguret, Dec 19 '12 at 14:09
@algorhythm Those are probably two distinct functions : one from an API and one from OP. — Denys Séguret, Dec 19 '12 at 14:10
Thank you guys found solution here... http://stackoverflow.com/questions/12475269/variable-doesnt-get-returned-from-ajax-function — Omer Abbas, Dec 19 '12 at 14:19

score 0 · Answer 1 · answered Dec 19 '12 at 14:08

You need a callback

Ajax requests do not return anything, they are asynchronous.

Try this:

var status = function(s){
    alert('Status: '+ s);
};

/**
 * Function to get login status
 * @returns boolean Logged in status
 * */
fbObject.getLoginStatus = function() {
    FB.getLoginStatus(function(response) {
        if (response.status == 'connected') {
           console.log('logged in');
           status(true);
         } else {
           console.log('not logged in');
           status(false);
         }
    });
}

Tried this but this is also not working :( – Omer Abbas Dec 19 '12 at 14:16 — Omer Abbas, Dec 19 '12 at 14:16

score 0 · Answer 2 · answered Dec 19 '12 at 14:08

0

The method is asynchronous, you are using it in a synchronous manner. It is impossible to return a value in the callback function.

answered Dec 19 '12 at 14:08

epascarello

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Hiny · Answer 3 · 2012-12-19T14:11:30.480

The function is Asynchronous,

What I would do is to run the "callback code" in the actual callback:

    fbObject.getLoginStatus = function() {
    FB.getLoginStatus(function(response) {
        if (response.status == 'connected') {
              console.log('logged in');
              alert('Status: '+ true);
            } else {
              console.log('not logged in');
              alert('Status: '+ false);
            }
    });
}

or pass a callback to the function, or stall, until the function has returned.

Javascript method isn't returning value

3 Answers3