How to get a page's Google Analytics tracking ID via a Chrome Extension?

Question

I used to use window.ga.getAll()[1].b.data.values[':trackingId']; a few months ago and it works well. But recently it's not working and says getAll is not a function.

What should I do instead?

update:

• I am using this for a page created by me, not a 3rd-party page.
• I am sure the ga is loaded when I make this call.

Answer 1

getAll is not immediately available when google analytics loads:

https://developers.google.com/analytics/devguides/collection/analyticsjs/ga-object-methods-reference

Don't — use ga object methods outside a readyCallback as the methods may not be available yet.

Instead, try this:

window.ga(() => window.ga.getAll()[1].b.data.values[':trackingId']);

which will run your function as part of a readyCallback.