v 14.0 Third Party 84
Download for v 14.0 Deploy on Odoo.sh
Lines of code 112531
Technical Name web_widget_mermaid
Also available in version v 12.0 v 10.0
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Mermaid flowchart widget

Beta License: AGPL-3 OCA/web Translate me on Weblate Try me on Runbot

This module adds a basic widget for rendering text fields as flowcharts using mermaid.

Table of contents


Put a widget="mermaid" attribute in relevant field tags in the view declaration:

<field name="flowchart" widget="mermaid"/>

Optionally, use an options attribute to pass a JSON object with mermaid configuration:

<field name="flowchart"
       options='{"theme": "forest", "gantt": {"fontSize": 14}}'/>

The syntax for creating diagrams is described in mermaid’s documentation.

As an example, this text:

graph LR
    10.0 --> 11.0
    11.0 --> 12.0
    12.0 -.-> 13.0

Produces this flowchart:



In demo mode, the addon adds a flowchart field to users so you can try it. This shows up in Runbot instances.

Upgrading Mermaid

This information is only relevant for the development of this addon, not for users.

This addon uses a slightly tweaked build of Mermaid that works in older browsers. To reproduce it, take the following steps:

  • Clone https://github.com/knsv/mermaid/

  • Checkout the version you want to upgrade to (e.g. git checkout 8.4.0)

  • In webpack.config.base.js, in const jsRule = ..., remove the include key (so all dependencies are transpiled)

  • In babel.config.js, in targets, add some browsers besides node: 'current'. I arbitrarily went with this:

    targets: {
      node: 'current',
      ie: '11',
      edge: '20',
      firefox: '35',
      chrome: '45',
      safari: '9',
  • Run yarn install

  • Run yarn build

  • The completed file is now in dist/mermaid.js. Try running grep 'let ' dist/mermaid.js to make sure everything was transpiled. The only output should be from comments.

  • Copy dist/mermaid.js to web_widget_mermaid/static/lib/mermaid/mermaid.js.

  • Bump the version number in __manifest__.py to match the Mermaid version.

Bug Tracker

Bugs are tracked on GitHub Issues. In case of trouble, please check there if your issue has already been reported. If you spotted it first, help us smashing it by providing a detailed and welcomed feedback.

Do not contact contributors directly about support or help with technical issues.



  • Therp BV


This module is maintained by the OCA.

Odoo Community Association

OCA, or the Odoo Community Association, is a nonprofit organization whose mission is to support the collaborative development of Odoo features and promote its widespread use.

This module is part of the OCA/web project on GitHub.

You are welcome to contribute. To learn how please visit https://odoo-community.org/page/Contribute.

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