Step 9. How to implement GA4 select_item event in Shopify

Below, you will find instructions on how to do it using Google Tag Manager and data layer variables in Shopify.

1. Firstly, you need to implement an event variable to be able to create select_item trigger. To do that you have to add additional javascript code. You have to find in your Shopify admin > Online store > Themes code snippet responsible for presenting "select_item" HTML element. When you find this HTML element you need to add in this code following code:
   

   dataLayer.push({
   'event': 'select_item', 
   'selected_item_list_id':'{{ collection.id}}', 
   'selected_item_list_name': '{{ collection.title}}',  
   'selected_items': [{
   item_id: '{{ product.id }}', 
   item_name: '{{ product.title| replace: '"'  , ' '   }}', 
   price:{{ product.price| money_without_currency }}, 
   'item_list_id': '{{ collection.id}}', 
   'item_list_name': '{{ collection.title}}' 
   }]
   });

2. Define new variables in Google Tag Manager using data layer. 
   Go to the "Variables",
   
   
   and in "User-Defined Variables" section click "New" button
   
   then:
   a) Create "DL – selected_item" layer variable as follow (chose variable type as "Data Layer Variable")
   
   b) Create “DL – selected_item_list_id” layer variable as follow (chose variable type as “Data Layer Variable”)
   
   c) Create "DL – selected_item_list_name" layer variable as follow (chose variable type as "Data Layer Variable")
   
3. Create a trigger that we use to fire GA4-select_item tag. Go to the trigger section and create a new"CE – select_item" trigger as follow:
   
4. Create GA4 – select_item tag in Google Tag Manger.
   Go to "Tags" and click "New" button to add new tag,
   
   
   and name like “GA4 – select_item”, and then choose tag type and select “Google Analytics: GA4 Event. Next choose your configuration tag that you have already created and set “Event Name” to “select_item” and then setup “Event Parameters” as follow:
   
   then choose your trigger that you have already created a while before (CE – select_item" ).
   
   and click "Save" button on the top right corner, and click "Submit" to published.

Lets go to the next step of our tutorial which is: How to implement GA4 purchase event on Shopify.