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I'm trying to set up a custom dimension for GA4 called chain_id using the gtag set method. I've also added a custom_map property in the config but I'm not even sure if that is necessary. The issue is that the chain_id is never being sent with the event as you can see in the console output from the GA debugger.

Not really sure what I'm missing here but I think that chain_id with the value of Test chain id should be present in event parameters.

document.getElementById("another").addEventListener("click", function(event) {
  gtag("event", "Button click");
});

<!-- Google tag (gtag.js) -->
<script async src="=<my-ga-id>"></script>
<script>
  window.dataLayer = window.dataLayer || [];

  function gtag() {
    dataLayer.push(arguments);
  }
  gtag("js", new Date());

  gtag("set", {
    chain_id: "Test chain id"
  });

  gtag("config", "<my-ga-id>", {
    debug_mode: true,
    custom_map: {
      dimension1: 'chain_id'
    }
  });
</script>

<button id="another">Another click</button>

I'm trying to set up a custom dimension for GA4 called chain_id using the gtag set method. I've also added a custom_map property in the config but I'm not even sure if that is necessary. The issue is that the chain_id is never being sent with the event as you can see in the console output from the GA debugger.

Not really sure what I'm missing here but I think that chain_id with the value of Test chain id should be present in event parameters.

document.getElementById("another").addEventListener("click", function(event) {
  gtag("event", "Button click");
});

<!-- Google tag (gtag.js) -->
<script async src="https://www.googletagmanager./gtag/js?id=<my-ga-id>"></script>
<script>
  window.dataLayer = window.dataLayer || [];

  function gtag() {
    dataLayer.push(arguments);
  }
  gtag("js", new Date());

  gtag("set", {
    chain_id: "Test chain id"
  });

  gtag("config", "<my-ga-id>", {
    debug_mode: true,
    custom_map: {
      dimension1: 'chain_id'
    }
  });
</script>

<button id="another">Another click</button>

• javascript
• google-analytics
• google-analytics-4
• custom-dimensions

Share Improve this question Follow edited Mar 2, 2023 at 17:20 BNazaruk 8,12633 gold badges2121 silver badges3939 bronze badges asked Sep 27, 2022 at 15:28 Nenad VracarNenad Vracar 122k1616 gold badges160160 silver badges183183 bronze badges

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2 Answers 2

Sorted by: Reset to default 8 +200

1. gtag set doesn't work. Well or at least it doesn't work as one would expect it to work. Google's documentation is off. Set changes the DL for GTM's benefit. It's not very useful for setting properties. But you have similar options.

2. You can just set the params within the event call itself, like so:

   gtag("event", "Button click", {chain_id: "test id"});

The picture is from this page's console.

2. You also can set the eps with the config and they will persist:

Note that Google made another sneak update for ignoring configs that are issued after the initial config has been used. So if you're trying to change persistent event parameters for all subsequent events by issuing a config and gtag.js just ignores it, then give this answer a read: can GA4 custom dimensions be updated after the initial 'config' call?

---

Overall, please consider using GTM. Or any other TMS. It makes tracking a lot easier to implement, manage, scale and support. Tracking directly with gtag.js only really makes sense when you have to do just a little bit of tracking and you don't really care much about what real business results this tracking achieves in the longer term.

I am not sure why set is not working. But maybe you can try to use config

Google Document about it

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When we use GTM to do something like this. We will use Field To Set and it's basically call gtag('config','{Your GA4 ID}', { 'chain_id': 'Test chain id' });

And this will need some additional code when you call event

gtag('event','click', { 'send_to': '{Your GA4 ID}' });

I think it is worth to try.

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