Скачать или смотреть How to Properly Add datalayer.push in WordPress's functions.php

Learn the right way to implement `datalayer.push` in your WordPress site to track product data effectively. This guide walks you through the process using the functions.php file.
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This video is based on the question https://stackoverflow.com/q/73117756/ asked by the user 'user14847965' ( https://stackoverflow.com/u/14847965/ ) and on the answer https://stackoverflow.com/a/73118848/ provided by the user 'Artemy Kaydash' ( https://stackoverflow.com/u/12873122/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Properly Add datalayer.push in WordPress's functions.php

Adding datalayer.push functionality to your WordPress site can enhance your tracking capabilities, especially if you are integrating Google Tag Manager. However, many developers face issues when trying to implement this in the functions.php file. If you're encountering the error message "Uncaught Error: Call to a member function get_id() on string...", you're not alone. In this guide, we'll explore how to properly implement datalayer.push to avoid such errors.

The Problem

When you try to add datalayer.push to the functions.php file, you may use code similar to the following:

[[See Video to Reveal this Text or Code Snippet]]

However, this code piece throws an error likely because $product is undefined when wp_head is called. The wp_head action does not pass a product object directly, leading to confusion and runtime errors.

The Solution

To implement datalayer.push correctly, follow these steps to modify the code to check if you're on a product page and to retrieve the product object properly.

Step 1: Modify the Action Hook

We still need to attach our function to wp_head, but this time we will write conditional logic inside to check when we are on a product page.

Step 2: Fetch the Product Information

Instead of trying to use a non-existent $product parameter, we will retrieve the global $post object and then fetch the product details using WooCommerce functions.

Updated Code

Here’s how the final code should look:

[[See Video to Reveal this Text or Code Snippet]]

Explanation of the Code

Check if on a Product Page: The code first checks if (!is_product()) to ensure it's executing only on product pages.

Accessing global $post: The global $post variable allows you to get the product ID, which is essential for the next step.

Fetching Product Data: Using wc_get_product($product_id), we retrieve the WooCommerce product object. This gives us access to various product details, including the get_id() method.

JavaScript Injection: Finally, we inject the necessary JavaScript code to push the product ID into the data layer.

Conclusion

Integrating datalayer.push in your WordPress site can significantly enhance your eCommerce tracking, provided it's done correctly. By following the updated code outlined above, you can eliminate errors and ensure that accurate product data is sent to your Google Tag Manager.

If you encounter difficulties or errors during implementation, remember to check if you’re working on a product page and if the WooCommerce plugin is activated. Happy coding!