Release 8.1.1

What's Changed

Bug fixed

• Raise error when copy method is used on base widget class by @mmc1718 in #3780
• Reverts #3689 and #3738 back to the original working codebase by @martinRenou in #3830

Docs

• Update to JupyterLite 0.1.0 by @jtpio in #3820

New Contributors

• @mmc1718 made their first contribution in #3780

Full Changelog: 8.1.0...8.1.1

Release 8.1.0

Improvements

• Allow CSS variables to be used as values in the Color trait by @nurbo in #3796
• Replace ipykernel dependency by the comm dependency by @martinRenou in #3811

Documentation

• Fix link to "Output widget examples" by @warrickball in #3801
• docs: remove developer docs resources by @emmanuel-ferdman in #3800
• Add missing close bracket in index.md by @warrickball in #3799
• Docs: Remove the note about mappings not working with selection widgets. by @ferdnyc in #3793

Maintenance

• Binder and yarn tweaks by @ferdnyc in #3795
• Remove shebang lines from test_* files by @frenzymadness in #3807

New Contributors

• @warrickball made their first contribution in #3801
• @emmanuel-ferdman made their first contribution in #3800
• @nurbo made their first contribution in #3796

Full Changelog: 8.0.7...8.1.0

Release 8.0.7

What's Changed

• fixed typo in docs by @djp52 in #3714
• DOC: added instruction to "Installing with pip" section by @StefanieSenger in #3779
• Lint by @jasongrout in #3782
• Fix tab widget with JupyterLab 4 by @martinRenou in #3787
• Explain that ipywidgets is part of jupyter-widgets software subproject by @paddymul in #3776
• Add support for building against JupyterLab 4 and Lumino 2 by @martinRenou in #3752
• docs/environment: Use jupyterlab-myst from pypi by @ferdnyc in #3794

New Contributors

• @djp52 made their first contribution in #3714
• @StefanieSenger made their first contribution in #3779
• @paddymul made their first contribution in #3776
• @ferdnyc made their first contribution in #3794

Full Changelog: 8.0.6...8.0.7

Release 8.0.6

What's Changed

• BUG: comm.kernel should be None when it has no kernel by @pllim in #3732
• Run prettier by @martinRenou in #3734
• add comm_manager check by @TTianshun in #3740
• Fix kernel attribute check by @martinRenou in #3737
• Add default pack_models by @bollwyvl in #3738
• fix: revert ipykernel dependency removal by @maartenbreddels in #3749

New Contributors

• @pllim made their first contribution in #3732
• @TTianshun made their first contribution in #3740

Full Changelog: 8.0.5...8.0.6

Release 8.0.5

What's Changed

• Fix deprecation warning by @jasongrout in #3670
• Overhaul docs toolchain by @bollwyvl in #3673
• More docs updates by @bollwyvl in #3674
• guard assignment of Element.prototype by @stevejpurves in #3644
• Add html colors "grey" in addition to "gray" by @Aztah in #3671
• Pass change options into update calls by @jasongrout in #3618
• Replace datalist children instead of appending by @jasongrout in #3682
• fix: deepcopy with structuredClone over JSON.parse/stringify by @manzt in #3689
• Fix notifications changing our visual tests by @jasongrout in #3694
• Fix CI by @martinRenou in #3720
• Using the new Comm Python package by @martinRenou in #3533
• chore: refine IClassicCom types by @manzt in #3722

New Contributors

• @Aztah made their first contribution in #3671
• @manzt made their first contribution in #3689

Full Changelog: 8.0.4...8.0.5

Release 8.0.4

What's Changed

• Fix slider change event issue with tapping by @ibdafna in #3617
• Fix unintentional deprecation warnings by @jasongrout in #3650
• define process.env for jlab dependencies by @stevejpurves in #3643
• Fix registry state lookup by @bollwyvl in #3653

Full Changelog: 8.0.3...8.0.4

Release 8.0.3

What's Changed

• fix: make .widget and .widget_types deprecated by @maartenbreddels in #3567
• Button tooltip fix - default to description by @jmk89 in #3589
• Backport PR #3590: using _comm_default shadows possible bugs by @maartenbreddels in #3591
• Add dev meeting info to readme by @jasongrout in #3594
• Stricter typescript + some cleanups by @vidartf in #3570
• Calculate correct stack level for deprecation warnings to show them to the user by @jasongrout in #3569
• Bump d3-color from 3.0.1 to 3.1.0 by @dependabot in #3603
• WidgetRenderer: Soften manager type requirement by @martinRenou in #3625
• Update to jupyterlite==0.1.0b14 by @jtpio in #3624
• Re-add the custom widget tutorial by @jtpio in #3611
• Handle KernelWidgetManager in the JupyterLab OutputModel by @jtpio in #3561
• fix: do not hold sync during set_state by @maartenbreddels in #3642

New Contributors

• @jmk89 made their first contribution in #3589

Full Changelog: 8.0.2...8.0.3

Release 8.0.2

What's Changed

• Update to lerna 5.4.3 by @jtpio in #3548
• Deserialize state before setting it, as is done elsewhere set_state is used by @jasongrout in #3549
• Make the selection widgets mapping options error more helpful. by @jasongrout in #3556
• Allow the 'class' attribute to pass the sanitizer by @jasongrout in #3565
• Tweak some typings by @vidartf in #3554
• Fix slider update on readout text change by @jtpio in #3568
• Allow Mappings to be given as the options in a selection widget again. by @jasongrout in #3557
• Make the widget renderer higher priority in JupyterLab by @jasongrout in #3579
• Datetime widget fixes by @vidartf in #3581
• Narrow deserialize and improve strictness by @vidartf in #3571
• Add a note about defining widget model defaults with es6 inheritance. by @jasongrout in #3582
• Remove migration note about selection widgets and dictionaries by @jasongrout in #3583

Full Changelog: 8.0.1...8.0.2

Release 8.0.1

Full Changelog: 8.0.0...8.0.1

8.0.0

What's Changed

See the 8.0.0 changelog for a more comprehensive summary of changes. To see the full list of pull requests and issues, see the 8.0 milestone on GitHub, or the full list of changes since 7.x.

Users

Here are some highlights of user-visible changes in ipywidgets 8.0.

Date and time pickers

In addition to the existing DatePicker widget, we now have new DatetimePicker and TimePicker widgets. (#2715)

from ipywidgets import VBox, TimePicker, DatetimePicker
VBox([
  TimePicker(description='Time'),
  DatetimePicker(description='Date/Time')
])

Tags input widget

The new TagsInput widget provides an easy way to collect and manage tags in a widget. You can drag and drop tags to reorder them, limit them to a set of allowed values, or even prevent making duplicate tags. (#2591, #3272)

from ipywidgets import TagsInput
TagsInput(
    value=['pizza', 'fries'],
    allowed_tags=['pizza', 'fries', 'tomatoes', 'steak'],
    allow_duplicates=False
)

Similarly, the new ColorsInput widget provides a way to select colors as tags

from ipywidgets import ColorsInput
ColorsInput(
    value=['red', '#2f6d30'],
    # allowed_tags=['red', 'blue', 'green'],
    # allow_duplicates=False
)

Stack widget

The new Stack container widget shows only the selected child widget, while other child widgets remain hidden. This can be useful if you want to have a area that displays different widgets depending on some other interaction.

from ipywidgets import Stack, Button, IntSlider, Dropdown, VBox, link
s = Stack([Button(description='Click here'), IntSlider()], selected_index=0)
d = Dropdown(options=['button', 'slider'])
link((dropdown, 'index'), (stacked, 'selected_index'))
VBox([d, s])

File upload widget

The file upload widget has been overhauled to handle multiple files in a more useful format:

• The .value attribute is now a list of dictionaries, rather than a dictionary mapping the uploaded name to the content.
• The contents of each uploaded file is a memory view in the .content key, e.g., uploader.value[0].content.
• The .data attribute has been removed.
• The .metadata attribute has been removed.

See the user migration guide for details on how to migrate your code.

(#2767, #2724, #2666, #2480)

More styling options

Many style and layout options have been added to core widgets:

• Tooltips are now supported for many core widgets, rather than just a few description tooltips (#2680)

  from ipywidgets import Button
  Button(description="Click me", tooltip='An action')

• Borders can be styled independently with the layout's border_top, border_right, border_bottom, border_left attributes (#2757, #3269)

  from ipywidgets import Button
  Button(description="Click me", layout={'border_bottom': '3px solid blue'})

• Descriptions are now plain text by default for security, but you can set them to allow HTML with the description_allow_html attribute (HTML content is still sanitized for security). (#2785)

  from ipywidgets import Text
  Text(description="<b>Name</b>", description_allow_html=True)

• Many other styling attributes can be set on core widgets, such as font family, size, style, weight, text color, and text decoration. See the table in the documentation for a reference. (#2728)
• The SelectionSlider now has a handle_color style attribute (#3142)
• To control keyboard navigation, widgets can be set to be tabbable or not (i.e., that the tab key will traverse to the widget) (#2640)

Selection container titles

The Accordion, Tab, and Stack widgets now have a .titles attribute that you can use to get and set titles from the constructor or as an attribute. (#2746, #3296, #3477)

from ipywidgets import Tab, IntSlider, Text
Tab([IntSlider(), Text()], titles=('Slider', 'Text'))

Slider implementation

The slider implementation in the core widgets now uses nouislider. This enables us to fix long-standing bugs and introduce new features, like dragging the range in a RangeSlider. (#2712, #630, #3216, #2834)

Collaboration

By default, ipywidgets 8 enables a collaboration mode, where widget updates from one frontend are reflected back to other frontends, enabling a consistent state between multiple users and fixing synchronization between the kernel and frontend. You may want to disable these update echo messages if they are using too much bandwidth or causing slower interactivity. To disable echo update messages across ipywidgets, set the environment variable JUPYTER_WIDGETS_ECHO to 0. For widget authors, to opt a specific attribute of custom widget out of echo updates (for example, if the attribute contains a lot of data that does not need to be synchronized), tag the attribute with echo_update=False metadata (we do this in core for the FileUpload widget's data attribute). (#3195, #3343, #3394, #3407)

CDN for html manager

We have made it easier to load widgets from content delivery networks.

• The default CDN is changed from unpkg to jsDelivr (#3121, #1627)
• You can use the data-jupyter-widgets-cdn-only attribute to load modules only from CDN (#2792, #2786)
• We have updated the webpack public path settings so the HTMLManager and the Jupyter Notebook extensions pull assets from wherever they are loaded, rather than only from CDN. If you author a custom widget, we highly encourage you to apply similar changes to your widget by adapting the changes at https://github.com/jupyter-widgets/widget-cookiecutter/pull/103/files. #3464, #3508

Other changes

Here is a short list of some of the other changes in ipywidgets 8.0.

• Add a cookiecutter-based tutorial to build a custom widget (#2919)
• Change media widgets to use memory views. (#2723)
• Upgrade to FontAwesome 5 in html-manager (#2713)
• Play widget now toggles between play and pause button as needed (#2703, #2671)
• Drop support for mapping types as selection options (#2679, #1958)
• Focus or blur a widget. (#2664, #2692, #2691, #2690)
• Drop notebook dependency from widgetsnbextension (#2590)
• Cast 'value' in range sliders to a tuple (#2441)
• Play widget: expose playing and repeat (#2283, #1897)
• Fix debouncing and throttling code (#3060)
• Fix regression on spinning icons (#2685, #2477)
• Fix selection container default index (#1823)
• Remove deprecated overflow properties (#2688)
• Select: Do not force a selec...