anywidget

custom jupyter widgets made easy

• 🛠️ create widgets without complicated cookiecutter templates
• 📚 publish to PyPI like any other Python package
• 🤖 prototype within .ipynb or .py files
• 🚀 run in Jupyter, JupyterLab, Google Colab, VSCode, and more
• ⚡ develop with instant HMR, like modern web frameworks

Learn more in the Jupyter blog.

Installation

anywidget is available on PyPI:

pip install "anywidget[dev]"

and also on conda-forge:

conda install -c conda-forge anywidget

Usage

import anywidget
import traitlets

class CounterWidget(anywidget.AnyWidget):
    # Widget front-end JavaScript code
    _esm = """
    function render({ model, el }) {
      let button = document.createElement("button");
      button.innerHTML = `count is ${model.get("value")}`;
      button.addEventListener("click", () => {
        model.set("value", model.get("value") + 1);
        model.save_changes();
      });
      model.on("change:value", () => {
        button.innerHTML = `count is ${model.get("value")}`;
      });
      el.appendChild(button);
    }
    export default { render };
    """
    # Stateful property that can be accessed by JavaScript & Python
    value = traitlets.Int(0).tag(sync=True)

Front-end code can also live in separate files (recommend):

import pathlib
import anywidget
import traitlets

class CounterWidget(anywidget.AnyWidget):
    _esm = pathlib.Path("index.js")
    _css = pathlib.Path("styles.css")
    value = traitlets.Int(0).tag(sync=True)

Read the documentation to learn more.

Support

Having trouble? Get help in our Discord or open a Discussion.

Contributing

New contributors welcome! Check out our Contributors Guide for help getting started.

Join us on Discord to meet other maintainers. We'll help you get your first contribution in no time!

License

MIT