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Hi again, You shouldn't need to use isOn() for a visual editor experiment. Are you seeing the experiment register when using the GrowthBook dev tools (Chrome plugin)? Or have you tried putting your SDK into debug mode and seeing if it's evaluating or failing for the visual experiment: Set

enableDevMode: true

in the SDK constructor and set

window._growthbook.debug = true

.

@happy-autumn-40938 Hi. Yes, we know. Basically, gb is working and showing different versions, but we have a problem specifically with tracking callback. Yes, we see the experiment in debug mode, and no issues are shown. Yes, we tried to enable debug more with

enableDevMode: true

in the SDK constructor and set

window._growthbook.debug = true

To overcome this problem we tried to push data to the data layer with a visual editor (but this is definitely not how it should be)

"js":"window.dataLayer = window.dataLayer || [];\n dataLayer.push(\n                    { \n                      event: 'experiment_viewed', \n                      eventCategory: 'experiment',\n                      experiment_id: 'black CTA',\n                      variation_id:  'show'\n                    }\n                )"

Please, help us to understand: 1. Why callback function can fail to launch? 2. When it should be launched (what trigger initiates it) 3. How can we force it to launch? If necessary I can send all the information you need to check it from your side

To better understand, does the actual DOM mutation for the visual experiment trigger? And you're just not getting the tracking callback? When things are working correctly, the tracking callback should be tightly coupled with your visual experiment applying DOM changes. You should never need to manually trigger your event tracking (dataLayer.push). If you'd like to share a URL with me (private message) I can take a quick look and see if there's anything obviously wrong.

"does the actual DOM mutation for the visual experiment trigger?" Yes "And you're just not getting the tracking callback?" yep, that`s right - we cant trigger this specific part "If you'd like to share a URL with me" done