How to add custom fields to the datalayer

You can code in a filter.

See this example in the FAQ.

https://www.ads-software.com/plugins/metronet-tag-manager/other_notes/

Hi Ronald,
Thanks for the quick reply!
Sorry, but I don’t understand this.

I have custom fields on my post, for example, “Pro”.

WordPress documentation custom fields says the function to retrieve the value of fields is as follows:
get_post_meta($post_id, $key, $single);

In your plug in, I entered:
“Pro” under “Name”
” get_post_meta($post_id, $key, $single);” under “Value”

But on the datalayer, it just outputs ” get_post_meta($post_id, $key, $single);
“, it doesn’t actually run the function.

I am interested in your plugin because I was told it allows to add custom fields data to the datalayer, but I can’t get it to work. Can you confirm that the plugin allows me to do it? If so, could you please explain how?

Thank you!!

Xavier

Okay, this is just pseudo-code, but feel free to try it out.

DataLayer variable name: pro
DataLayer Value: {pro_value}
Custom Field Key: Pro
Custom Field Value: ????

add_filter( 'gtm_pro_value', function( $all, $match, $post_id ) {
  return get_post_meta( $post_id, 'Pro', true );
}, 10, 3 );

Thanks, Ronald! But where do I enter this code?

You should see a section below your post to input custom data layer variables.

See: https://www.ads-software.com/plugins/metronet-tag-manager/screenshots/