Question

96

Firebase - Count online users

rated 0 times [ 100] [ 4] / answers: 1 / hits: 22163 / 11 Years ago, fri, april 12, 2013, 12:00:00

I tried using presence to make it display the total connected users in an element. I can't really figure out how to make it work.

I also tried doing the following:

    var dataUlist = new Firebase('https://<url>.firebaseio.com/.info/connected');

    dataUlist.on('value', function(snap) {

        console.log(snap);

    });

To tried to see if I could find anything useful in there, but I couldn't figure out how the data works.

Is there any way to accomplice what I am after? Fetch the total number of connected users and then echo it out in the console or to an element?

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ignacio

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answered 11 Years ago peytont · Accepted Answer

.info/connected will only return information about whether the current client is connected or not. In order to maintain a presence count, you'll need to create a counter by storing presence information for each user and utilizing setOnDisconnect(). For example:

var listRef = new Firebase(https://<url>.firebaseio.com/presence/);

var userRef = listRef.push();



// Add ourselves to presence list when online.

var presenceRef = new Firebase(https://<url>.firebaseio.com/.info/connected);

presenceRef.on(value, function(snap) {

  if (snap.val()) {

    // Remove ourselves when we disconnect.

    userRef.onDisconnect().remove();



    userRef.set(true);

  }

});



// Number of online users is the number of objects in the presence list.

listRef.on(value, function(snap) {

  console.log(# of online users =  + snap.numChildren());

});