GTM Custom Trigger Setup Based on Gravito GCM Consents

Overview

Gravito CMP pushes consent updates using a custom event named gravitoGCMConsents. Each consent value is available under consent.* in the dataLayer.

This guide explains how to:

  • Create Data Layer Variables (DLVs)
  • Create Custom Event triggers
  • Map consent categories to GCM signals
  • Fire tags based on consent
Cookie Consent Category GCM v2 Values
Necessary security_storage
Analytics analytics_storage
Functional functionality_storage, personalization_storage
Marketing ad_storage, ad_user_data, ad_personalization

Step 1: Create Data Layer Variables

Go to GTM UI:

  1. Navigate to Variables
  2. Click New under User-Defined Variables
  3. Click Variable Configuration
  4. Select Data Layer Variable

Create variables for the following:

  • consent.security_storage
  • consent.analytics_storage
  • consent.functionality_storage
  • consent.personalization_storage
  • consent.ad_storage
  • consent.ad_user_data
  • consent.ad_personalization

Example:

Name: DLV - consent.analytics_storage
Data Layer Variable Name: consent.analytics_storage
Version: Version 2

Step 2: Create Custom Event Trigger

  1. Go to Triggers
  2. Click New
  3. Select Custom Event

Configuration:

Name: CE - Gravito GCM Consents
Event Name: gravitoGCMConsents
Trigger fires on: All Custom Events

Step 3: Create Category-Based Triggers

Analytics Trigger

  1. Go to Triggers → New
  2. Select Custom Event

Name: CE - Analytics Granted
Event: gravitoGCMConsents

Condition: DLV - consent.analytics_storage equals granted

Marketing Trigger

Name: CE - Marketing Granted
Event: gravitoGCMConsents

Condition (strict): DLV - consent.ad_storage equals granted
AND
DLV - consent.ad_user_data equals granted
AND
DLV - consent.ad_personalization equals granted

Functional Trigger

Name: CE - Functional Granted
Event: gravitoGCMConsents

Condition: DLV - consent.functionality_storage equals granted

OR

DLV - consent.personalization_storage equals granted

Necessary Trigger

Name: CE - Necessary Granted
Event: gravitoGCMConsents

Condition: DLV - consent.security_storage equals granted

Step 4: Attach Triggers to Tags

  1. Go to Tags
  2. Select a tag
  3. Click Triggering
  4. Add the relevant trigger

Example:

  • Analytics Script → CE - Analytics Granted
  • Marketing Pixel → CE - Marketing Granted
  • Functional Script → CE - Functional Granted

Step 5: Testing

  1. Click Preview in GTM
  2. Open your website
  3. Trigger consent changes

Verify:

  • Event gravitoGCMConsents is fired
  • Variables show correct values
  • Tags fire only when consent is granted

Final Flow

Gravito CMP → dataLayer (consent values)\ → GTM Variables
→ Custom Event Trigger
→ Conditional Trigger
→ Tag Fires