dash-core-components

Dash Core Components

This package provides the core React component suite for Dash.

Development

This package is part of dash, and if you install dash in development mode with extras as below, you can develop in this portion as well. From the root of the dash repo:

# It's recommended to install your python packages in a virtualenv
# As of dash 2.0, python 3 is required
$ python -m venv venv && . venv/bin/activate

# make sure dash is installed with dev and testing dependencies
$ pip install -e .[dev,testing]  # in some shells you need \ to escape []

# run the build process - this will build all of dash, including dcc
$ npm ci && npm run build

# install dcc in editable mode
$ pip install -e .

Code quality and tests

To run integration tests (test_integration.py)

You can run the Selenium integration tests with the

npm test

Testing your components in Dash

• Run the build watcher by running $ npm run build:watch

• Run the dash layout you want to test

   # Import dash_core_components to your layout, then run it:
   $ python my_dash_layout.py
  

Dash Component Boilerplate

See the dash-component-boilerplate repo for more information.

Big Thanks

Cross-browser Testing Powered by

Changelog

[3.2.0] - 2025-07-31

Added

• #3369 Expose dash.NoUpdate type
• #3371 Add devtool hook to add components to the devtool bar ui.

Fixed

• #3353 Support pattern-matching/dict ids in dcc.Loading target_components
• #3371 Fix allow_optional triggering a warning for not found input.
• #3379 Fix dcc.Graph backward compatibility with dash 2.0 for ddk.Graph
• #3373 Fix layout as list and persistence.

Changed

• #3365 Warn if dcc.Slider has more than 500 marks and use default instead.