Add banner based on language

[YozoraXCII]

I use the alternate feature to switch between different branches of my documentation (latest, develop, nightly).

I want to add a warning banner to every page either above or below the navigation bar highlighting to the user "You are currently viewing the nightly/develop version of the documentation, [click here] to go to the latest version"

Any suggested ways of achieving this?

extra:
  alternate:
    - name: Latest Docs
      link: /en/latest/
      lang: en
    - name: Develop Docs
      link: /en/develop/
      lang: en
    - name: Nightly Docs
      link: /en/nightly/
      lang: en

[kamilkrzyskow]

Hello @YozoraXCII,
I'm not so sure if alternate is the proper way to manage your branches, as it was intended to be used as a language switcher.
For versioning using mike is preferred: https://squidfunk.github.io/mkdocs-material/setup/setting-up-versioning/

But lets say you're going to stick with this approach, then you can add a banner to the announce Jinja2 block:

• https://squidfunk.github.io/mkdocs-material/customization/#extending-the-theme
• https://squidfunk.github.io/mkdocs-material/customization/#overriding-blocks

and the contents would be decided based on a conditional using the page.file.dest_uri or page.url values, as they change between versions.

Something similar to this should suffice, in your main.html override:

{% extends "base.html" %}

{% block announce %}

    Check how the value looks like -> page.file.dest_uri = {% page.file.dest_uri %}
    {% if page.file.dest_uri.startswith("en/latest") %}
      ...
    {% elif page.file.dest_uri.startswith("en/develop") %}
      ...
    {% else %}
      ...
    {% endif %}

{% endblock %}