Javascript method isn't returning value [duplicate]

Question

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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
– Bergi, Commented Dec 19, 2012 at 14:08
What is the value you are getting for the response.status?? — palaѕн
– palaѕн, Commented Dec 19, 2012 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
– Denys Séguret, Commented Dec 19, 2012 at 14:09
@algorhythm Those are probably two distinct functions : one from an API and one from OP. — Denys Séguret
– Denys Séguret, Commented Dec 19, 2012 at 14:10
Thank you guys found solution here... stackoverflow.com/questions/12475269/… — Omer Abbas
– Omer Abbas, Commented Dec 19, 2012 at 14:19

Naftali · Accepted Answer · 2012-12-19 14:08:07Z

0

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);
         }
    });
}

answered Dec 19, 2012 at 14:08

Naftali

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1 Comment

Omer Abbas Over a year ago

Tried this but this is also not working :(

epascarello · Accepted Answer · 2012-12-19 14:08:27Z

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, 2012 at 14:08

epascarello

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Comments

Hiny · Accepted Answer · 2012-12-19 14:11:30Z

0

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.

edited Dec 19, 2012 at 14:11

answered Dec 19, 2012 at 14:09

Hiny

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