Embedded form tracking in GTM doesn't work in new form editor

[JAalbers]

When I use the new form editor (in beta), I discovered that the form tracking in GTM doesn't work. Form submits with 'old' embedded Hubspot forms still work. I used the code that's referred to all over the internet: 

<script type="text/javascript"> 
window.addEventListener("message", function(event) { 
  console.log(event.data);
  if(event.data.type === 'hsFormCallback' && event.data.eventName === 'onFormSubmitted') {
    
    window.dataLayer.push({ 
      'event': 'hubspot_form_success', 
      'hs-form-guid': event.data.id }); 
  } 
}); 
</script>

I've already checked the Hubspot documentation but can't find changes in how to track form submits with this new editor. Does anybody have a solution for this?

[JAalbers · Accepted solution]

Update: For people experiencing the same problem: I also reported this to the support team and I eventually received this response:

It has been very tricky to identify and test the new form editor to capture events in GTM. - Seems like at the moment this is not supported by the new editor, and we reached out to our engineering team, and we were not given any specific expectations if this is something that they plan to implement in the future. At least not during the BETA version of form submissions. In the meantime, the recommendation is to keep using the legacy form editor so you can continue keeping track and creating events for GTM. 

In short, the conversion tracking does not work with the new editor and will not work during the beta. I am very surprised that a company like Hubspot did not think about conversion tracking during development. The new editor works nicely, but I will certainly not use the new editor for this reason.

Please support my idea to integrate this functionality in the new editor. 

[RobertColson · Accepted solution]

Hi all, HubSpot employee here!

I've researched internally, and our team suggests that the new form editor (i.e., Forms 2.0) uses a different event name. Kindly refer to the New Form Global Events doc to set up form events with GTM. For anything dev- or troubleshooting-related to this topic, it would be best to consult HubSpot Developer Support or the Developer Community.

[JAalbers · Accepted solution]

Hi! I noticed two issues in your code:

- The correct event property is event.detail, not event.data. HubSpot uses the standard CustomEvent object, and the data is stored under .detail.

- You’re opening a block (with a curly bracket) directly after console.log(event.data); without a closing bracket — that’s a syntax error. Solution: remove the unnecessary curly bracket.

I’ve tested the new global events that @RobertColson  suggested — they work great!

You can use the following code in your Custom HTML tag and trigger it on DOM ready to ensure all relevant events are captured:

<script>
(function() {
function pushToDataLayer(eventName, event) {
window.dataLayer = window.dataLayer || [];

var formId = event.detail.formId;
var instanceId = event.detail.instanceId;

var data = {
event: eventName,
formId: formId,
instanceId: instanceId
};

dataLayer.push(data);
}

window.addEventListener('hs-form-event:on-submission:success', function(event) {
pushToDataLayer('form_submit_success', event);
});

window.addEventListener('hs-form-event:on-submission:failed', function(event) {
pushToDataLayer('form_submit_failed', event);
});

window.addEventListener('hs-form-event:on-interaction:navigate:next', function(event) {
pushToDataLayer('form_navigate_next', event);
});

window.addEventListener('hs-form-event:on-interaction:navigate:previous', function(event) {
pushToDataLayer('form_navigate_previous', event);
});
})();
</script>

[FMaury · Accepted solution]

Hi! My bad I was OOO so I didn't catch the news on this matter...
If needed, I was working on a custom HTML GTM that listen the old and new Hubspot form submissions:

<script>
var eventName = "hubspot-form-success";
var includeFormData = true;

window.addEventListener("message", function(event) {
if (event.data && event.data.type === "hsFormCallback" && 
(event.data.eventName === "onFormSubmitted")) {
var formData = {
event: eventName + "-v3",
"hs-form-guid": event.data.id
};

if (includeFormData && event.data.data && event.data.data.submissionValues) {
for (var field in event.data.data.submissionValues) {
if (event.data.data.submissionValues.hasOwnProperty(field)) {
var cleanedField = field.replace(/[^\w]/g, "_");
var key = "hs-" + cleanedField;
formData[key] = event.data.data.submissionValues[field];
}
}
}

window.dataLayer = window.dataLayer || [];
window.dataLayer.push(formData);
}
});

window.addEventListener("hs-form-event:on-submission:success", function(event) {
if (typeof HubspotFormsV4 === "undefined") return;

var form = HubspotFormsV4.getFormFromEvent(event);
if (!form) return;

var formData = {
event: eventName + "-v4",
"hs-form-id": form.getFormId()
};

if (includeFormData) {
form.getFormFieldValues().then(function(values) {
if (values && values.length) {
for (var i = 0; i < values.length; i++) {
var field = values[i];
var cleanedName = field.name.replace(/[^\w]/g, "_");
var key = "hs-" + cleanedName;
formData[key] = field.value;
}
}
window.dataLayer.push(formData);
});
} else {
window.dataLayer.push(formData);
}
});
</script>

[GParker97 · Accepted solution]

Hello,

After hours of trial and error trying to find an equivalent to the legacy form solution, I've found that the below javascript works. It captures both the submission event, pushes the success event to the dataLayer, and captures the form ID as per the original code snippet, using the HubSpot recommended methods (as described on the HubSpot global forms page😞

<script type="text/javascript">
  window.addEventListener("hs-form-event:on-submission:success", function(event) {
      window.dataLayer.push({
        'event': 'hubspot_form_success',
        'hs-form-guid': HubSpotFormsV4.getFormFromEvent(event).getFormId(),
      });
  });
</script>

I've seen some other replies similar to this but not quite as simple or direct, so decided to post my solution as well.

Hope this helps!

Greg

[BérangèreL]

Hi @GParker97 and welcome to the HubSpot Community!

Thank you so much for sharing the solution, this will be really helpful for other Community Members who find this thread! ❤️

Have a wonderful weekend! 🌞
Bérangère

[RobertColson · Accepted solution]

Hi all, HubSpot employee here!

I've researched internally, and our team suggests that the new form editor (i.e., Forms 2.0) uses a different event name. Kindly refer to the New Form Global Events doc to set up form events with GTM. For anything dev- or troubleshooting-related to this topic, it would be best to consult HubSpot Developer Support or the Developer Community.

[G_Pereira]

Hi ! 

I'm not an expert but I've done some tests with what you've provided and I couldn't get it to work on Google tag manager? Has anyone succeeded?

<script type="text/javascript"> 
window.addEventListener("hs-form-event:on-submission:success", function(event) { 
  console.log(event.data); {
    
    window.dataLayer.push({ 
      'event': 'hs-form-event:on-submission:success', 
      'hs-form-guid': event.data.id }); 
  } 
}); 
</script>

Have a nice day

[JAalbers · Accepted solution]

Hi! I noticed two issues in your code:

- The correct event property is event.detail, not event.data. HubSpot uses the standard CustomEvent object, and the data is stored under .detail.

- You’re opening a block (with a curly bracket) directly after console.log(event.data); without a closing bracket — that’s a syntax error. Solution: remove the unnecessary curly bracket.

I’ve tested the new global events that @RobertColson  suggested — they work great!

You can use the following code in your Custom HTML tag and trigger it on DOM ready to ensure all relevant events are captured:

<script>
(function() {
function pushToDataLayer(eventName, event) {
window.dataLayer = window.dataLayer || [];

var formId = event.detail.formId;
var instanceId = event.detail.instanceId;

var data = {
event: eventName,
formId: formId,
instanceId: instanceId
};

dataLayer.push(data);
}

window.addEventListener('hs-form-event:on-submission:success', function(event) {
pushToDataLayer('form_submit_success', event);
});

window.addEventListener('hs-form-event:on-submission:failed', function(event) {
pushToDataLayer('form_submit_failed', event);
});

window.addEventListener('hs-form-event:on-interaction:navigate:next', function(event) {
pushToDataLayer('form_navigate_next', event);
});

window.addEventListener('hs-form-event:on-interaction:navigate:previous', function(event) {
pushToDataLayer('form_navigate_previous', event);
});
})();
</script>

[FMaury]

Hi! 

Thanks a lot for this code, I've modified it on my side to get all form fields values but you helped a lot 🙂

Just a question, did you manage to associate the "form_navigate_next" dataLayer event with the step ? I mean, if my form have 4 steps, I didn't figure out how to differenciate them... And I didn't find any help in the Hubspot API documentation

Thanks a lot!

[AnnaGma]

Hi @JAalbers ! 

Thanks a lot for the solution, it does work!

Do you know if it's also possible to track enhanced conversion data (send user's email to the data layer together with the success event)?

[JAalbers]

Hi @AnnaGma , 

By default, the hs-form-event:on-submission:success event does not expose the user's form input data (like email), so you can't directly grab the email address at that point. The data has already been sent to HubSpot, and it's no longer accessible via the DOM or the event object. You could listen for the user's input in the email field and when it has been filled, store it in sessionStorage. Then you can use it in you success-event. Below you can find a code example. Your input HTML field should have a name=“email” attribute for this to work.

How to Track the User's Email (for Enhanced Conversions)

• Listen for the user's input in the email field
• Capture the value when the user types it and store it in sessionStorage:

document.addEventListener('input', function(e) { if (e.target.name === 'email') { sessionStorage.setItem('hs_user_email', e.target.value); } });​

• Retrieve the email when the form is successfully submitted
• Modify your existing listener to include the stored email:

window.addEventListener('hs-form-event:on-submission:success', function(event) { var email = sessionStorage.getItem('hs_user_email'); window.dataLayer = window.dataLayer || []; dataLayer.push({ event: 'hubspot_form_success', hubspot_form_id: event.detail.formId, hubspot_form_instance_id: event.detail.instanceId, email: email }); });

This way, you can send the email address to the dataLayer alongside the success event, making it compatible with enhanced conversion setups (e.g. in Google Ads or GTM server-side tagging).

[JAalbers]

Additionally, I think it's best to only fire this code on pages that contain a HubSpot form. You can do that by creating a custom JavaScript variable with the following code:

function() {
  if ( document.querySelector('script[src*="hsforms.net"]') ) {
    return true;
  } else {
    return false;
  } 
}

Then, you can modify the trigger so that it only fires when this variable returns true.

[FMaury]

Hi!

I've been working with a colleague on a new version of the listener and everything seems to work so far!
We are making the last modifications but I can keep you updated when everything will be accessible so you can try on your side if you want?

[JAalbers]

Wow, great! Please share if you're ready.

[FMaury · Accepted solution]

Hi! My bad I was OOO so I didn't catch the news on this matter...
If needed, I was working on a custom HTML GTM that listen the old and new Hubspot form submissions:

<script>
var eventName = "hubspot-form-success";
var includeFormData = true;

window.addEventListener("message", function(event) {
if (event.data && event.data.type === "hsFormCallback" && 
(event.data.eventName === "onFormSubmitted")) {
var formData = {
event: eventName + "-v3",
"hs-form-guid": event.data.id
};

if (includeFormData && event.data.data && event.data.data.submissionValues) {
for (var field in event.data.data.submissionValues) {
if (event.data.data.submissionValues.hasOwnProperty(field)) {
var cleanedField = field.replace(/[^\w]/g, "_");
var key = "hs-" + cleanedField;
formData[key] = event.data.data.submissionValues[field];
}
}
}

window.dataLayer = window.dataLayer || [];
window.dataLayer.push(formData);
}
});

window.addEventListener("hs-form-event:on-submission:success", function(event) {
if (typeof HubspotFormsV4 === "undefined") return;

var form = HubspotFormsV4.getFormFromEvent(event);
if (!form) return;

var formData = {
event: eventName + "-v4",
"hs-form-id": form.getFormId()
};

if (includeFormData) {
form.getFormFieldValues().then(function(values) {
if (values && values.length) {
for (var i = 0; i < values.length; i++) {
var field = values[i];
var cleanedName = field.name.replace(/[^\w]/g, "_");
var key = "hs-" + cleanedName;
formData[key] = field.value;
}
}
window.dataLayer.push(formData);
});
} else {
window.dataLayer.push(formData);
}
});
</script>

[Chris_Bronc]

I would love that. Please keep us updated! 

[Cnadler]

Are there any updates on this? 

[MeikaB]

Hey @JAalbers or @PamCotton 

We are looking to roll out these forms for a couple of clients, and I'm wondering if there have been any updates on tracking capabilities since the latest updates, please? 

[JAalbers]

Hi @MeikaB , I heard that the product team is actively working on this now. It should be rolled out by the end of the year.

[SilasFindley]

Hi @JAalbers, I just wanted to check to see if you have heard anything about the new form editor working with GTM now that it's December/almost the end of the year.

[JAalbers]

Unfortunately no! 

[GCampus]

March 11st 2025 / It looks like there is still no solution 😕
Does someone found one?
It's crazy that we cannot track form submission with GTM with the new hubspot form editor, can't understand how, it's so important for all companies like mine...

[FMaury]

Hi, it seems that there is no event sent at all when form is submitted, I don't have anything when i submit the form and by checking with: console.log(event.data.type)

I hope they will work on this for the beta because this is a huge loss...

Do you have anything on your side?