Скачать или смотреть How to Use Dynamic Variables in Script Tags in Next.js

Learn how to implement Google Analytics and Google Tag Manager with dynamic variables in script tags within your Next.js application, enhancing data tracking efficiently.
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Implementing Dynamic Variables in Script Tags with Next.js

Next.js is a powerful framework for building React applications, allowing developers to leverage both server-side and client-side rendering. As you build a web application, tracking user behavior becomes essential, and integrating tools like Google Analytics and Google Tag Manager is fundamental for this purpose. However, many developers encounter challenges when trying to implement these integrations with dynamic variables based on the environment, such as development or production. In this guide, we'll explore how to effectively add these script tags using dynamic variables in your Next.js application.

The Problem

When developers want to integrate Google Analytics and Google Tag Manager into their Next.js applications, they often need to use environment variables to ensure the right configurations are loaded based on the deployment stage. For instance, you might have different Google Tag Manager container IDs for your development and production environments. The challenge arises when trying to use these IDs dynamically in script tags within the _document.tsx file.

Current Implementation

You've probably encountered code snippets that look similar to this in the _document.tsx file:

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

However, you might want to use a dynamic approach where the Google Tag Manager ID is sourced from an environment variable.

The Solution

Next.js allows you to embed JavaScript expressions within your JSX using curly braces. This makes it possible to dynamically reference environment variables in your script tags.

Step-by-Step Implementation

Here’s how you can adjust your <script> tag to use the dynamic GTM_CONTAINER_ID variable directly from your environment variables:

Define Your Environment Variables: Ensure you have the correct Google Tag Manager IDs configured in your environment variables. You can set them in a .env file as follows:

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

Update _document.tsx: Modify your _document.tsx file to include the updated script tag that references the environment variable. Here’s the revised code:

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

Key Points to Remember

Curly Braces: Use curly braces {} to embed the JavaScript expressions within the JSX attributes. This allows you to directly access the process.env variables when constructing your script source URL.

Testing: Don’t forget to test your implementation in both development and production environments to ensure the correct IDs are being loaded.

Conclusion

Integrating Google Analytics and Google Tag Manager into your Next.js application is simple when you leverage dynamic variables correctly. By modifying the _document.tsx file to include your environment variables, you can ensure that the right tracking configurations are active based on your deployment stage. This not only streamlines your development process but also enhances your ability to analyze user behavior effectively.

Now you can confidently set up your Next.js app with dynamic tracking configurations that adapt to your needs!