Data Layer Meta Field

A tiny, single-file WordPress plugin that adds a per-page/per-post field for pushing custom values into the Google Tag Manager / analytics dataLayer.

Add structured JSON (or a value) to any page or post in the editor, and the plugin injects a dataLayer.push(...) for it in the site footer — no theme edits, no code, no per-page hardcoding.

What it does

• Adds a "Data Layer Field" meta box to the post and page editors.
• Stores whatever you enter in post meta (_data_layer_value).
• On the frontend (singular views), outputs:

  <script>window.dataLayer = window.dataLayer || []; dataLayer.push( <your value> );</script>

  so GTM and other tags can read it.

Install

1. Copy data-layer-meta-field.php into wp-content/plugins/data-layer-meta-field/ (or zip the folder and upload it via Plugins → Add New → Upload).
2. Activate Data Layer Meta Field in the WordPress admin.

Usage

1. Edit any page or post.
2. In the Data Layer Field box, paste a JSON object, e.g.:

   { "event": "page_meta", "pageType": "product", "brand": "Rolex" }

3. Update the page. View it on the frontend — the object is pushed to window.dataLayer and available to GTM.

The value is output as-is into a dataLayer.push() call, so enter valid JSON (or a valid JS expression). Input is admin-only and nonce-protected on save.

Notes

• No settings page, no dependencies, no external calls.
• Works alongside GTM; it does not install GTM for you.

License

MIT