Panel 1.5.0

Announcements
1

We are extremely pleased to announce the release of Panel 1.5.0!

Find the release blog post here: Panel 1.5.0 Release – HoloViz Blog
Changelog: Release Version 1.5.0 · holoviz/panel · GitHub

This release, while technically a minor release hugely expands the scope of what is possible in Panel. In particular the introduction of the new panel.custom module makes it trivially easy to create new JS and React based components using modern tooling, a first-class developer experience and support for compilation and bundling. We are incredibly excited to see which new components you build using this approach. This release also includes native integration with FastAPI, such that you can now run Panel apps natively on an existing FastAPI server. We also introduce a number of new components, improved the developer experience, and squashed a huge number of bugs, particularly for the Tabulator component.

We really appreciate all the work that went into this release from 21 separate contributors. In particular we would like to welcome our new contributors @twobitunicorn, @justinwiley, @dwr-psandhu, @jordansamuels, @gandhis1, @jeffrey-hicks, @kdheepak, @sjdemartini, @alfredocarella and @pmeier. Next we want to recognize our returning contributors @cdeil, @Coderambling, @jrycw and @TBym, and finally the dedicated crew of core contributors which includes @Hoxbro, @MarcSkovMadsen, @ahuang11, @maximlt, @mattpap, @jbednar and @philippjfr.

Features

  • Allow building custom ESM based JSComponent and ReactComponent (#5593)
  • Add Placeholder pane (#6790)
  • Add FileDropper widget (#6826)
  • Add ChatStep component to show/hide intermediate steps (#6617)
  • Add TimePicker widget (#7013)
  • Add PyComponent baseclass (#7051)
  • Add native support for running Panel on FastAPI server (#7205)

Enhancements

  • Allow callbacks after append and stream (#6805)
  • Enable directory uploads with FileInput (#6808)
  • Make autoreload robust to syntax errors and empty apps (#7028)
  • Add support for automatically determining optimal Tabulator.page_size (#6978)
  • Various typing improvements (#7081, #7092, #7094, #7132)
  • Display value for player (#7060)
  • Optimize rendering and scrolling behavior of Feed (#7101)
  • Implement support for multi-index columns in Tabulator (#7108)
  • Add placeholder while loading to ChatFeed (#7042)
  • Allow streaming chunks to HTML and Markdown panes (#7125)
  • Show Player interval value on click (#7064)
  • Expose Player options to scale and hide buttons (#7065)
  • Add on_keyup and value_input for CodeEditor (#6919)
  • Detect WebGL support on BrowserInfo (#6931)
  • Tweak ChatMessage layout (#7209, #7266)
  • Add nested editor to Tabulator (#7251)
  • Support anchor links in HTML and Markdown panes (#7258, #7263)

Bug fixes

  • Ensure Gauge is responsively sized (#7034)
  • Ensure Tabulator sorters are correctly synced (#7036)
  • Ensure Tabulator selection is consistent across paginated, sorted and filtered states (#7058)
  • Do not propagate clicks on input elements in Card header (#7057)
  • Ensure Tabulator range selection applies to current view (#7063)
  • Ensure Tabulator.selection is updated when indexes change (#7066)
  • Ensure Tabulator can be updated with None value (#7067)
  • Fix issues with PYTHONPATH in Jupyter Preview (#7059)
  • Ensure Tabulator styling is correctly applied on multi-index (#7075)
  • Fix various scrolling related Tabulator issues (#7076)
  • Ensure Tabulator data is updated after filters are changed (#7074)
  • Allow controlling DataFrame pane header and cell alignment (#7082)
  • Highlight active page in Tabulator using Fast Design (#7085)
  • Ensure follow behavior works when streaming to paginated Tabulator (#7084)
  • Avoid events boomeranging from frontend (#7093)
  • Correctly map Tabulator expanded indexes when paginated, filtered and sorted (#7103)
  • Ensure custom HoloViews backends do not error out (#7114)
  • Ensure events are always dispatched sequentially (#7128)
  • Ensure 'multiselect' Tabulator.header_filter uses ‘in’ filter function (#7111)
  • Ensure no content warning is not displayed when template is added (#7164)
  • Make it easy to prompt user for input in ChatFeed (#7148)
  • Fix LaTeX pane MathJax rendering (#7188)
  • Ensure OAuth expiry is numeric and can be compared (#7191)
  • Correctly detect max depth of NestedSelect if level is empty (#7194)
  • Make --setup/--autoreload/--warm work with --num-procs (#6913)
  • Ensure error rendering application does not crash server (#7223)
  • Refactor state.notifications to fix pyodide (#7235)
  • Handle setting None value on DateRangePicker (#7240)
  • Add header_tooltips parameter to Tabulator (#7241)
  • Fix issue using Tabulator.header_filter with recent Pandas versions (#7242)
  • Fix setting of Dial background (#7261)
  • Fix issues when loading multiple times in a Jupyter(Lab) session (#7269)

Compatibility and Updates

  • Update to Bokeh 3.5.x
  • Update Tabulator to 6.2.1 (#6840)
  • Update to latest Pyscript (2024.08.01) and Pyodide (0.26.2) (#7016)
  • Add compatibility for latest Textual (#7130)

Documentation

  • Update Tabulator.ipynb to show correct version number of Tabulator (#7053)
  • Update jupyterlite version (#7129)
  • Describe usage of pyscript editor (#7017)
  • Add pycafe deployment guide (#7183)
  • Add WebLLM example to gallery (#7265)

Deprecation and API Warnings

  • PasswordInput and TextAreaInput no longer inherit directly from TextInput (#6593)
  • Remove deprecated panel.depends.param_value_if_widget function (#7202)
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