How to get Traffic source data in universal analytics?
I'm trying the following code in firebug console:-
ga(function(tracker) {
var src = tracker.get('campaignSource');
console.log(src);
});
But it always logs 'undefined'.
The field 'campaignMedium' also returns 'undefined'.
But I get correct values for some fields like 'clientId' or 'screenResolution' or 'language'.
Is there some other process to get these infromation?
P.S: I'm using https://developers.google.com/analytics/devguides/collection/analyticsjs/field-reference#trafficsources for reference of field names.