MkDocs Plugin for embedding Drawio files

Sergey (onixpro) is the original creator of this plugin but since his repository isn't maintained anymore we forked it on the 19th December of 2023 and have been keeping it up-to-date and expanding on the features since then. Buy Sergey a ☕

Features

This plugin enables you to embed interactive drawio diagrams in your documentation. Simply add your diagrams like you would any other image:

You can either use diagrams hosted within your own docs. Absolute as well as relative paths are allowed:

Absolute path:
![](/assets/my-diagram.drawio)

Same directory as the markdown file:
![](my-diagram.drawio)

Relative directory to the markdown file:
![](../my-diagram.drawio)


Or you can use external urls:
![](https://example.com/diagram.drawio)

Additionally this plugin supports multi page diagrams by using either the page or alt property. To use the page property, you need to use the markdown extension attr_list.

Either use the alt text:
![Page-2](my-diagram.drawio)
![my-custom-page-name](my-diagram.drawio)

Or use the page attribute:
![Foo Diagram](my-diagram.drawio){ page="Page-2" }
![Bar Diagram](my-diagram.drawio){ page="my-custom-page-name" }

Setup

Install plugin using pip:

pip install mkdocs-drawio

Add the plugin to your mkdocs.yml

plugins:
  - drawio

Configuration Options

Full documentation of the configuration options and examples can be found in the official documentation

By default the plugin uses the official url for the minified drawio javascript library. To use a custom source for the drawio viewer you can overwritte the url. This might be useful in airlocked environments.

If you want to use a self-hosted JavaScript viewer file. You should download the latest version from the official drawio repo.

Self-hosted viewer paths can be configured as site-root paths such as /js/viewer-static.min.js. The plugin normalizes them per page, so they also work on versioned deployments such as mike.

plugins:
  - drawio:
      viewer_js: "https://viewer.diagrams.net/js/viewer-static.min.js"

Further options are:

plugins:
  - drawio:
      tooltips: true       # Enable tooltips on diagram elements
      border: 5            # Border size / padding around diagrams
      edit: true           # Enable opening the editor for diagrams
      darkmode: true       # Enable dark mode support (classic MkDocs and Material)
      highlight: "#0000FF" # Highlight color for hyperlinks
      lightbox: true       # Enable opening the lightbox on click
      toolbar:             # Control the looks and behaviour of the toolbar
        pages: true        # Display the page selector
        tags: true         # Display the tags selector
        zoom: true         # Display the zoom controls
        layers: true       # Display the layer controls
        lightbox: true     # Display the lightbox / fullscreen button
        position: "top"    # Control the position of the toolbar (top or bottom)
        no_hide: false     # Do not hide the toolbar when not hovering over diagrams
        show_title: false  # Show the diagram title in the toolbar based on the file name

Material Integration

If you are using the Material Theme and want to use the instant-loading feature. You will have to configure the following:

In your mkdocs.yaml:

theme:
  name: material
  features:
    - navigation.instant

plugins:
  - drawio

extra_javascript:
  - https://viewer.diagrams.net/js/viewer-static.min.js
  - javascripts/drawio-reload.js

Add docs/javascripts/drawio-reload.js to your project:

document$.subscribe(({ body }) => {
  // if drawio toolbar icons/buttons are not showing or missing due to title being longer than the image width
  // you can set a minimum width for the graph viewer by uncommenting the following line
  // GraphViewer.prototype.minWidth = 500;

  GraphViewer.processElements()

  // required to fix duplicate display of external drawio graphs (via http)
  reload();
})

Using Tabs (pymdownx.tabbed)

If you want to use drawio diagrams inside of tabs you need to make sure that the diagrams are processed after the tabs are rendered. You can achieve this by adding the following javascript to your mkdocs.yml:

extra_javascript:
  - javascripts/drawio-tabs.js

Add docs/javascripts/drawio-tabs.js to your project:

document.addEventListener('change', (event) => {
  // Check if the target is a pymdownx tab input
  if (event.target.matches('.tabbed-set > input')) {
    GraphViewer.processElements()
  }
});

Its a bit of a workaround as it listens for all events on the page and retriggers the drawio processing if any tab is clicked.

How it works

1. mkdocs generates the html per page
2. mkdocs-drawio attaches to the on_post_page event. For more details, please have a look at the event lifecycle documentation
3. Adds the drawio viewer library
4. Searches through the generated html for all img tags that have a source of type .drawio
5. Replaces the found img tags with mxgraph html blocks (actual drawio diagram content). For more details, please have a look at the official drawio.com documentation.

Contribution guide

1. Setup a virtual environment: python3 -m venv venv && source venv/bin/activate
2. Install poetry: pip install poetry
3. Install dependencies and current version: poetry install
4. Make your desired changes
5. Add a test for your changes in the example directory
6. Test your changes by starting mkdocs serve in the example directory
7. Increase the version in pyproject.toml
8. Make sure poetry run ruff check . and poetry run black --check . passing
9. Open your pull request ✨️