get_field not working in wp_footer

• John D

• February 13, 2019 at 2:35 am

I have a true/false field to allow the end user to enable or disable Google Tag Manager code from being displayed on a per page basis. In this case, the client wants the code to only display on two different pages.

The following code works perfectly fine when hooked into wp_enqueue_scripts

function google_tag_manager() { ?>

<?php if ( get_field('enable_google_tag_manager_code') ) { ?>
<!-- Google Tag Manager -->
<script>
(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':
new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],
j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src=
'https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);
})(window,document,'script','dataLayer','XXX-XXXXXXX');
</script>
<!-- Google Tag Manager -->
<?php } ?>

<?php }
add_action('wp_enqueue_scripts', 'google_tag_manager' );

It WILL NOT work when hooked into wp_footer

function google_tag_manager() { ?>

<?php if ( get_field('enable_google_tag_manager_code') ) { ?>
<!-- Google Tag Manager -->
<script>
(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':
new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],
j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src=
'https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);
})(window,document,'script','dataLayer','XXX-XXXXXXX');
</script>
<!-- Google Tag Manager -->
<?php } ?>

<?php }
add_action('wp_footer', 'google_tag_manager' );

Am I missing something?

• John D

• February 13, 2019 at 5:24 am

Figured it out!

function google_tag_manager() {
global $wp_query;
?>
<?php if ( get_field('enable_google_tag_manager_code', $wp_query->post->ID) ) { ?>
<!-- Google Tag Manager -->
<script>
(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':
new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],
j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src=
'https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);
})(window,document,'script','dataLayer','XXX-XXXXXXX');
</script>
<!-- Google Tag Manager -->
<?php } ?>
<?php }
add_action('wp_footer', 'google_tag_manager' );