John Davidson

Message:

I'm running Code snippets plugin on Wordpress. I want to be able to include Google Tag Manager on only one specific post in my blog. This is because I only care about the outbound events showing up in Analytics for one specific post, and I don't want GTM to slow down every other page or post just for it.

I have two separate Code Snippets. One for adding GTM to header, which looks like:

if ( is_single('511') ) {

    add_action( 'wp_head', function () { ?>

    <!-- 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','GTM-000000');</script>

    <!-- End Google Tag Manager -->

    <?php } );

};

And one for adding GTM to the body open, which looks like:

if ( is_single('511') ) {

    add_action( 'wp_body_open', function () { ?>

    <!-- Google Tag Manager (noscript) -->

    <noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-000000"

    height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>

    <!-- End Google Tag Manager (noscript) -->

    <?php } );

};

A note on both, the Code Snippets plugin as I understand it, already opens and closes with PHP tags so they aren't necessary except for inside this code to add HTML to the head and open body functions and then opens PHP again.

I'm checking and re-checking, clearing caches and the code isn't showing on the page. My GTM code was removed from the code above.

I'm very sketchy with PHP knowledge, what am I missing on my if statement?

I have searched a lot but never finding a specific use-case matching mine to just appear on one post only.

---

My Answer:
Your code snippets look correct for adding Google Tag Manager to a specific WordPress post. However, there are a few things you can check to troubleshoot why the code is not showing on the page:

1. Make sure the post ID you are using in the `is_single` function is correct. You can find the post ID by editing the post in WordPress and looking at the URL. It should be something like `post.php?post=511&action=edit`, where `511` is the post ID.

2. Check if there are any conflicting plugins or themes that might be preventing the code from running. Try disabling other plugins or switching to a default WordPress theme to see if the code appears.

3. Clear any caching plugins or server-side caches that might be storing an older version of the page without the GTM code.

4. Double-check the GTM code itself to make sure it is correct and properly formatted.

If you have checked all of the above and the code still does not appear on the specific post, you may want to consider reaching out to the Code Snippets plugin support for further assistance.