Google Tag Manager & Optimize Server-Side experiment sending variation

Question

I\'m using the Google Tag Manager container for managing scripts. I\'m trying to perform a server-side Optimize/Analytics experiment. I require server-side for performance r

Answer 1

Solved by explicitly specifying a tracker id.

I used Analytics Debugger Chrome by Google to debug the issue and found that Google Tag Manager (GTM) made the tracker id gtm1 so I had to prefix things with that.

To find out your tracker ID, call ga.getAll()[0].get('name') (may be gtm1, gtm2, etc.).

Changed my setGAExperiment function to the following

function setGAExperimentCX(_expId, _vId){
    ga('gtm1.set', 'exp', _expId.toString() + '.' + _vId.toString());

    // this forces the above exp set to be sent to GA, you can name the event whatever you want with whatever values you want
    ga('gtm1.send', 'event', 'Experiment', 'Trigger', _expId.toString() + '.' + _vId.toString());
}

The function that calls setGAExperimentCX is

function performNewCartExp(_vId) {
    if (typeof ga == "undefined") {
        if (_performNewCartExp != undefined) { clearTimeout(_performNewCartExp); }
        _performNewCartExp = setTimeout(function () { performNewCartExp(_str); }, 250);
    } else {
        setGAExperimentCX('XXXXXXXXXXX', parseInt(_vId, 10));
    }
}