panel

This release is primarily a bug fix release but also includes a number of enhancements. Many thanks to @Hoxbro, @joelostblom, @raybellwaves, @pdrok, @tlvu, @govinda18, @MridulS and the core maintainers @MarcSkovMadsen, @maximlt and @philippjfr for contributing to this release.

Enhancements

• Add repr to cell and edit events (#3434)
• Improvements for pyodide handling (#3444, #3508, #3511)
• Add support for Plotly animation frames (#3449)
• Implement single and multi-selection in Vega pane (#3470, #3499, #3505)
• Add typehints to help developers and users (#3476)
• Add pn.state.execute method to run callbacks in the right context (#3550)
• Add support for asynchronous on_edit/on_click Tabulator callbacks (#3550)
• Add DatetimeRangeSlider widget (#3548)

Bug fixes

• Fix pyodide array buffer conversion (#3409)
• Allow placeholder to be updated on TextEditor (#3427)
• Fix issues editing data in sorted columns (#3431)
• Ensure bokeh correctly detects whether HTML/Markdown contains latex (#3438)
• Ensure notifications work on server created with pn.serve and .show (#3445)
• Replace slickgrid background image in custom FastTemplate CSS (#3461)
• Ensure param.Array is synced correctly in ReactiveHTML (#3456)
• Ensure selection on filtered Tabulator does not raise out-of-bounds error (#3462)
• Ensure updating Tabulator does not reset scroll position (#3450)
• Various fixes for FastTemplate CSS (#3464)
• Ensure Tabulator on_click and on_edit events return correct row when paginated (#3410)
• Fix broken JupyterLab preview (#3469)
• Skip Tabulator row selection when clicking on expand button (#3474)
• Ensure overflow in MaterialTemplate is not clipped (#3492)
• Allow providing --index for directory style apps (#3493)
• Ensure Tabulator expanded rows are sized correctly after re-render (#3507)
• Make CodeHandler robust to document that has been destroyed (#3510)
• Do not sync DataFrame widget sorters parameter with bokeh model (#3527)
• Ensure that HoloViews callback events are not auto-dispatched (#3528)
• Ensure non-updateable Pane can be updated inside Tabs (#3532)
• Fix slowdown of JupyterLab on Windows (#3531)
• Fix issue with inverted data when editing a cell in a sorted Tabulator column (#3531)
• Ensure Tabulator has correct layout after re-render (#3536)
• Do not log events generated by admin page on the admin page (#3539)
• Fix Tabulator events when the original column is not a string (#3541)

Documentation

• Adds docstrings to layouts (#3417)
• Show how to filter categorical and temporal data from Altair/VegaLite (#3401)
• Document how to make a Tabulator column non-editable (#3489)

Blog post: https://blog.holoviz.org/panel_0.13.0.html

Features

• Add support for scheduling global callbacks (#2661)
• MathJax now supported in Markdown and HTML (#2847)
• Improved support for async (e.g. in ParamMethod/ParamFunction, bind, onload etc.) (#2964, #3264, #2737)
• Support rendering Panel objects in Jupyterlite and Pyodide (#3252, #3361, #3381)
• Add JSONEditor widget (#1974)
• Add quill.js based TextEditor widget (#2875)
• Add GenericLoginHandler for custom OAuth (#2873, #2960)
• Implement Notifications API for templates (#3093)
• Implement built-in threading (#2597, #2632, #3081)
• Implement profiling page for Panel (#2645, #2664, #2667, #2707, #2905)
• Implement support for Vega events (#2592)
• Implement ArrayInput widget (#2047)
• Add Debugger widget (#2548)
• Add LinearGauge indicator (#3222)
• Add ComponentResourceHandler to server (#3284, #3289, #3303)

Enhancements

Components

• Editable sliders name can be changed (#2678)
• Make Plotly pane resize when window resizes (#2704)
• Viewer objects can now be used with pn.serve (#2769)
• VTK improvement for NaN handling (#2826)
• Add support for configuring Vega output (#2846)
• Add a groups parameter to Select widget (#2876)
• Add Card.hide_header option (#2947)
• Support bytes and pathlib.Path objects on Image (#2963, #3294)
• Add programmatic control over Player widget (#2970, #2994)
• Add alphabetical and custom sort to Param (#2986)
• Add autoplay and muted to Audio and Video (#3053)
• Add a disabled_options parameter to a custom Select widget (#3067)
• Expose the orientation parameter of the button group widgets (#3083)
• Add support for rendering pandas styler objects (#3152)
• Viewer now better at working with depends functions (#3159)
• Improve support for jinja2 loops in ReactiveHTML (#3236)
• Add ability to require explicit load of ReactiveHTML extension (#3254)
• Improve datetime handling of sliders (#3276)
• Add support for multiple files in FileInput.save (#3300)
• Add improved Tabs model that resolves sizing and hover issues (#3301, #3321, #3329)

Tabulator

• Add support to expand rows in Tabulator (#2762, #2837, #3010, #3163)
• Implement client-side filtering on Tabulator (#2815, #3298)
• Add Tabulator.header_align parameter (#2861)
• Implement Tabulator.on_edit callbacks (#2887, #3209, #2958)
• Implement DateEditor and DatetimeEditor for Tabulator (#2899, #3008)
• Implement Tabulator.buttons (#3111)
• Redesign Tabulator.styles handling (#3175)
• Set default alignment for Tabulator (#3194)
• Bidirectionally sync Tabulator.sorters (#3217)
• Add support for setting percentage widths on Tabulator columns (#3239)
• Add Tabulator.on_click callback (#3245)
• Restore Tabulator scroll position after patch (#3273)
• Enable max row limits for Tabulator (#3306)

Notebook

• Add basic JupyterLab theme support (#2848)
• Support jupyter server root_dir with lab extension (#3172)
• Avoid multiple extension execution in the notebook (#3266)
• Added fullpath to jupyter_server_extension (#3270)

General improvements

• Warn users if extension is not loaded before server page is rendered (#2766)
• Sync URL location hash interactively (#2982)
• Change accent and header background color for Fast Templates (#2984)
• Add thread safety and TTL to pn.state.as_cached (#3198)
• Add py.typed file to support mypy (#3055)
• Handle authentification errors (#3096)
• Support saving png to file-like objects (#3155)
• Check if there are any query parameters in baseurl and adds it to location.search if possible (#3214)
• Improve handling of --index CLI argument (#3221)
• Fix event dispatch (#3231)
• Add azure oauth v2.0 endpoint support (#3224)
• Ensure gc.collect is not excessively called (#3259)
• Added panel.reactive and panel.viewable to namespace (#3157)
• Consistent handling of page title (#3290)

Bugs

Components

• Fix warnings in ReactiveHTML regex (#2786)
• Fixed UTF-8 decoding in Terminal widget (#2880)
• Allow a param.Selector with no objects to be casted to AutocompleteInput (#2966)
• Update ButtonGroup value when changing options (#2999)
• Fix TQDM style color reset (#3040)
• Fix align-items on Flexbox (#3122)
• Fix issue serializing Spinner with negative value (#3154)
• Fixes for jslinking HoloViews components (#3165)
• BooleanStatus and LoadingSpinner now update when changing color (#3191)
• Fix Widget.from_param when precedence is negative (#3199)
• Ensure DiscreteSlider label is updated (#3278)
• Ensure ReactiveHTML template variables only escapes exact matches (#3279)
• Fix handling of single and empty options on DiscreteSlider (#3297)
• Ensure Progress correctly initializes as indeterminate (#3307)
• Always resolve DOM nodes in ReactiveHTML._scripts (#3311)
• Fixes CrossSelector.disabled parameter (#3326)
• Fix EditableSlider updates when no value_throttled is set (#3387)

Tabulator

• Fix HTMLTemplateFormatter on Tabulator (#2781)
• Fix layout of Tabulator with non-default theme (#3147)
• Ensure Tabulator selection is not reset on patch (#3287)
• Fix Tabulator.download method (#3292)
• Restore ability to limit number of selectable rows on Tabulato (#3295)
• Ensure Tabulator value update reports correct old value (#3308)

Templates

• Fix Fast template vertical slider CSS (#3045)
• Fix template theme.css (#3057)
• Ensure roots are rendered into GoldenTemplate (#3313)
• Ensure correct theme is applied to HoloViews pane in template (#3386)

General

• Added check for bool in Location.parse_query (#2759)
• Ensure cleanup happens when enabling --warm or --autoreload with Bokeh 2.4 (#2760)
• Ensure autoload.js correctly determines state.rel_path (#2776)
• Fix issue with .app method (#3047)
• Add document argument to django.py autoload_js_script call (#3100)
• Avoid sending messages on closed or closing Websocket (#3115)
• Fix Django resource handling (#3116)
• Fix handling of loading_max_height (#3205)
• Fix Django DocConsumer (#3281)
• Fix jupyter_server_config for preview server extension (#3291)
• Fix handling of oauth_provider argument to panel.io.server.serve (#3293)
• Allow exporting absolute paths when saving (#3305)

Documentation

• Added ToggleGroup docs (#2679)
• Adds a code of conduct (#2892)
• Add docstrings to sliders module (#3176)
• Gallery Examples for Graphviz and NetworkX (#2732)
• Add layouts + throttling sections to Peformance docs (#3171)
• Adds Plotly styling gallery notebook (#3038)
• Adds a matplotlib style guide notebook to gallery (#3036)
• Adds vega altair style example for the gallery. (#3032)
• Wrap new gallery examples into apps (#2546)
• Add docstring to panel module (#3177)
• added documentation for gcp (#3119)
• Add docs about the file size limits of the FileInput widget (#3044)
• Add docstrings for most widgets and panes (#3352, #3353, #3354, #3359, #3365, #3366, #3367, #3369)

Compatibility

• Update to latest version of Perspective (#3318)
• Update Vega version (#3320)
• Update ipywidgets support for compatibility with latest bokeh (#3206, #3299)
• Bump plotly.js version (#3227)
• Updates to Param 2.0 API (#2845)
• Updates for Python 3.10 deprecations (#3065)
• Update and improve DeckGL pane (#3158)

API Changes

• Make Param.mapping public (#3173)
• Switch DatetimePicker start/end to param.Date (#3202)
• Perspective parameters renamed: row_pivots -> split_by, column_pivots -> group_by and computed_columns -> expressions (#3318)