manual_teachbooks/book/features/custom-launch-button.md

```{admonition} User types
:class: tip
This page is useful for user type 4 and 5.
```
{bdg-primary}`Sphinx Extension`

Multilingual book

The custom launch button extension allows you to create a customizable button in the top right of your jupyter book. This may have many applications, one of them being that you can create different language versions of the book available for the user.

This section will explain how to create a "Languages" or " " button, like you might be used to seeing on just about any website. The use of the button, however, is completey customizable and may be used in many different ways.

Installation

1. Install the Sphinx Launch Buttons extension from the GitHub repository. Paste the following line, in your terminal. Make sure you activated your book building environment.

pip install git+https://github.com/TeachBooks/Sphinx-launch-buttons.git

2. To use the extension in your book, you need to include it in your _config.yml file.

sphinx:
  extra_extensions:
    - custom-launch-buttons

3. Then you need to include a _launch_buttons.yml file in the same location as your _config.yml file. The following code cell shows the main structure of that file.

buttons:
  - type : dropdown

  - type : button

Here, buttons is an array of launch buttons, each can be identified using 2 types: 'dropdown' or 'button'. The cell above shows 2 buttons, one of type dropdown and one of type button.

The button/dropdown can be visualised using either an svg icon or text.

buttons:
  - type : dropdown
    label: Language
  - type : button
    icon : <svg> ... 
            </svg> 

4. Lastly you need to specifiy the items of your button. So assuming you want to have different language versions, each item will be one of the languages.

buttons:
  - type : dropdown
    label: Language

  - type : button
    icon : <svg> ... 
            </svg> 
    items:
      - label: English
        url: url of branch
      - label: Nederlands
        url: url of branch

As you can see in the items: line, each dropdown option links to the branch of the repository in the respective language.

Setting up your repository

For the implementation to your book, it is handy to create a branch for each language version you want to offer. Make a new branch using for example main as a source. Assuming we want to create a dutch version of you can call this branch Dutch or Nederlands.

You will then need to translate the content in the dutch branch to dutch which can take some time. From experience, DeepL is a good tool for this but any AI chatbot might be helpful as well. Make sure to proofread the translation.

You'll need to add (merge) the updated _config.yml and the new _launch_buttons.yml to all of your branches.

Example

buttons:
  - type: dropdown
    icon: <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-globe" viewBox="0 0 16 16">
            <path d="M0 8a8 8 0 1 1 16 0A8 8 0 0 1 0 8m7.5-6.923c-.67.204-1.335.82-1.887 1.855A8 8 0 0 0 5.145 4H7.5zM4.09 4a9.3 9.3 0 0 1 .64-1.539 7 7 0 0 1 .597-.933A7.03 7.03 0 0 0 2.255 4zm-.582 3.5c.03-.877.138-1.718.312-2.5H1.674a7 7 0 0 0-.656 2.5zM4.847 5a12.5 12.5 0 0 0-.338 2.5H7.5V5zM8.5 5v2.5h2.99a12.5 12.5 0 0 0-.337-2.5zM4.51 8.5a12.5 12.5 0 0 0 .337 2.5H7.5V8.5zm3.99 0V11h2.653c.187-.765.306-1.608.338-2.5zM5.145 12q.208.58.468 1.068c.552 1.035 1.218 1.65 1.887 1.855V12zm.182 2.472a7 7 0 0 1-.597-.933A9.3 9.3 0 0 1 4.09 12H2.255a7 7 0 0 0 3.072 2.472M3.82 11a13.7 13.7 0 0 1-.312-2.5h-2.49c.062.89.291 1.733.656 2.5zm6.853 3.472A7 7 0 0 0 13.745 12H11.91a9.3 9.3 0 0 1-.64 1.539 7 7 0 0 1-.597.933M8.5 12v2.923c.67-.204 1.335-.82 1.887-1.855q.26-.487.468-1.068zm3.68-1h2.146c.365-.767.594-1.61.656-2.5h-2.49a13.7 13.7 0 0 1-.312 2.5m2.802-3.5a7 7 0 0 0-.656-2.5H12.18c.174.782.282 1.623.312 2.5zM11.27 2.461c.247.464.462.98.64 1.539h1.835a7 7 0 0 0-3.072-2.472c.218.284.418.598.597.933M10.855 4a8 8 0 0 0-.468-1.068C9.835 1.897 9.17 1.282 8.5 1.077V4z"/>
          </svg>
    items:
      - label: English
        url: https://teachbooks.github.io/files-and-folders/EN
      - label: Nederlands
        url: https://teachbooks.github.io/files-and-folders/NL

The code in the above cell is the _launch_buttons.yml file of a repository called "files-and-folders". The buttons created look like this:

---
width: 50%
name: language_button
---
Custom Button