Leverage environment variables within your index.html file

Currently, I am using Angular and I am encountering an issue while attempting to utilize an environment variable in my index.html for Google Analytics. I have attempted the following approach:

<script>
    import {environment} from "./environments/environment";
</script>
<!-- End Google Tag Manager (noscript) -->
<script async src="https://www.googletagmanager.com/gtag/js?id=" + environment.googleAnalytics></script>
<script>
    window.dataLayer = window.dataLayer || [];
    function gtag(){dataLayer.push(arguments);}
    gtag('js', new Date());


    gtag('config', environment.googleAnalytics);
</script>

Unfortunately, I am facing an issue with concatenation in the script link. Could you please assist me? Specifically, the concatenation section 

https://www.googletagmanager.com/gtag/js?id=" + environment.googleAnalytics
is not functioning as expected.

javascriptangulartypescript

Answer №1

Attempting to concatenate the <script> html tag is not possible since it is intended for HTML, not JavaScript code. Consider using JavaScript to load the script instead, allowing you to concatenate your environment.googleAnalytics property.

Answer №2

One effective method is to create separate index.html files such as index.dev.html and index.prod.html, where you can explicitly define the necessary environment variables. Then, by utilizing the file replacement feature, you can easily switch between them similar to how environment files are swapped out.

"fileReplacements": [
    {
        "replace": "src/index.html",
        "with": "src/index.prod.html"
    }
]

Answer №3

If you want to incorporate Google Analytics into your project, make sure to include it in your dependencies and then insert your tracking code into index.html as explained in the link below.

npm install --save @types/google.analytics

This reference could provide a solution to your query. Check out this discussion thread for more information.

Using Google Analytics with Angular 4+

Answer №4

To make a customized version of index.html, save it as index.someenv.html. By adjusting the environment configuration in angular.json, you can set up file replacement like this:

"fileReplacements": [{
    "replace": "src/index.html",
    "with": "src/index.someenv.html"
}]

When you initiate your build using the Angular CLI, these files will be automatically swapped out.

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