Panel

Date: 2024-10-03

This release is a small patch release primarily addressing a regression handling selections on multi-indexed data on the Tabulator widget along with a number of documentation improvements. Many thanks to jrycw along with MarcSkovMadsen, Hoxbro and philippjfr for their contributions to this release.

Bug fixes

- Fix regression handling selection on multi-indexed `Tabulator` data ([7336](https://github.com/holoviz/panel/pull/7336))
- Fix Fast template theme toggle color ([7341](https://github.com/holoviz/panel/pull/7341))

Documentation

- Fix typo for FastListTemplate reference example ([7339](https://github.com/holoviz/panel/pull/7339))
- Fix custom component docstrings ([7342](https://github.com/holoviz/panel/pull/7342))
- Improve plotly style guide ([7346](https://github.com/holoviz/panel/pull/7346))
- Ensure sidebar toggle patch is loaded correctly ([7349](https://github.com/holoviz/panel/pull/7349))
- Fix and update WebLLM example ([7351](https://github.com/holoviz/panel/pull/7351))
- Correctly document step unit on `DateSlider` ([7353](https://github.com/holoviz/panel/pull/7353))

Date: 2024-09-27

This release primarily focuses on a number of tweaks and enhancements for the documentation and also resolves a number of bugs related to `Tabulator` rendering and the new `FastAPI` integration. As always, many thanks to our contributors including our new contributors dennisjlee and alexcjohnson, our returning contributors thuydotm and jbednar and the core maintainer team hoxbro, maximlt, ahuang11, MarcSkovMadsen and philippjfr.

Enhancements

- Add mapboxgl CSS to `Plotly` ([7320](https://github.com/holoviz/panel/pull/7320))
- Tweak margins of icons in `ChatMessage` ([7310](https://github.com/holoviz/panel/pull/7310))

Bug fixes

- Fix langchain import in `panel.chat.langchain` ([7297](https://github.com/holoviz/panel/pull/7297))
- Ensure Tabulator is consistently redrawn after render and resize ([7305](https://github.com/holoviz/panel/pull/7305))
- Filter out empty plotly_selected events ([7312](https://github.com/holoviz/panel/pull/7312))
- Improve parameter validation on `Timepicker` ([7308](https://github.com/holoviz/panel/pull/7308))
- Ensure `Tabulator.selection` consistency when `pagination='local'` ([7304](https://github.com/holoviz/panel/pull/7304))
- Correctly handle ipv6 localhost URI in `Location` ([7316](https://github.com/holoviz/panel/pull/7316))
- Ensure resource URLs are handled correctly in all server implementations ([7318](https://github.com/holoviz/panel/pull/7318))
- Ensure `Plotly` datetime are correctly converted from timestamp to date string ([7319](https://github.com/holoviz/panel/pull/7319))

Regressions

- Only postpone `--setup` script until after server startup if `--num-procs` is greater than 1 ([7289](https://github.com/holoviz/panel/pull/7289))

Compatibility

- Support for Bokeh 3.6.x releases ([7322](https://github.com/holoviz/panel/pull/7322))

Documentation

- Fix and improve JupyterLite pyodide distribution ([7286](https://github.com/holoviz/panel/pull/7286))
- Document how to apply gradient styling o `Tabulator` cells ([7291](https://github.com/holoviz/panel/pull/7291))
- Clarified wording in best practices docs ([7290](https://github.com/holoviz/panel/pull/7290))
- Minor tweaks for the `FileDropper` ([7307](https://github.com/holoviz/panel/pull/7307))
- Ensure docs consistently recommend `--dev` over `--autoreload` ([7285](https://github.com/holoviz/panel/pull/7285))
- Tweaks for Tabulator docs ([7315](https://github.com/holoviz/panel/pull/7315))
- Improve fastapi docs ([7317](https://github.com/holoviz/panel/pull/7317))
- Add note about Tabulator font-size ([7321](https://github.com/holoviz/panel/pull/7321))
- Tweak best practices ([7301](https://github.com/holoviz/panel/pull/7301))
- Fix typo in JPG component docs ([7323](https://github.com/holoviz/panel/pull/7323))

Date: 2024-09-13

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](https://github.com/holoviz/panel/pull/5593))
- Add `Placeholder` pane ([6790](https://github.com/holoviz/panel/pull/6790))
- Add `FileDropper` widget ([6826](https://github.com/holoviz/panel/pull/6826))
- Add `ChatStep` component to show/hide intermediate steps ([6617](https://github.com/holoviz/panel/pull/6617))
- Add `TimePicker` widget ([7013](https://github.com/holoviz/panel/pull/7013))
- Add `PyComponent` baseclass ([7051](https://github.com/holoviz/panel/pull/7051))
- Add native support for running Panel on FastAPI server ([7205](https://github.com/holoviz/panel/pull/7205))

Enhancements

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

Bug fixes

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

Compatibility and Updates

- Update to Bokeh 3.5.x
- Update `Tabulator` to 6.2.1 ([6840](https://github.com/holoviz/panel/pull/6840))
- Update to latest Pyscript (2024.08.01) and Pyodide (0.26.2) ([7016](https://github.com/holoviz/panel/pull/7016))
- Add compatibility for latest `Textual` ([7130](https://github.com/holoviz/panel/pull/7130))

Documentation

- Update Tabulator.ipynb to show correct version number of `Tabulator` ([7053](https://github.com/holoviz/panel/pull/7053))
- Update jupyterlite version ([7129](https://github.com/holoviz/panel/pull/7129))
- Describe usage of pyscript editor ([7017](https://github.com/holoviz/panel/pull/7017))
- Add pycafe deployment guide ([7183](https://github.com/holoviz/panel/pull/7183))
- Add WebLLM example to gallery ([7265](https://github.com/holoviz/panel/pull/7265))

Deprecation and API Warnings

- `PasswordInput` and `TextAreaInput` no longer inherit directly from `TextInput` ([6593](https://github.com/holoviz/panel/pull/6593))
- Remove deprecated `panel.depends.param_value_if_widget` function ([7202](https://github.com/holoviz/panel/pull/7202))

Date: 2024-07-25

This release addresses includes a wide range of bug fixes and some minor enhancements primarily aimed at performance. Many thanks to CodeRambling as a returning contributor, and the core developer team including Hoxbro, MarcSkovMadsen, maximlt and philippjfr for contributing to this release.

Enhancements

- Ensure `Design` is applied globally when using global templates ([6992](https://github.com/holoviz/panel/pull/6992))
- Do not re-render all children when expanding Tabulator row ([7008](https://github.com/holoviz/panel/pull/7008))
- Allow providing `DataFrame` as part of vega(-lite) spec ([6979](https://github.com/holoviz/panel/pull/6979))

Bug fixes

- Clear selection if value change from pagination=remote ([6008](https://github.com/holoviz/panel/pull/6008), [#6968](https://github.com/holoviz/panel/pull/6968))
- Ensure user cookie can be unencoded ([6937](https://github.com/holoviz/panel/pull/6937))
- Do not trigger ScrollButton event unless clicked ([6938](https://github.com/holoviz/panel/pull/6938))
- Do not error on autoreload shutdown ([6940](https://github.com/holoviz/panel/pull/6940))
- Ensure hooks such as plot linking are applied across roots in a template ([6975](https://github.com/holoviz/panel/pull/6975))
- Ensure `Feed` maintains scroll position ([6984](https://github.com/holoviz/panel/pull/6984))
- Ensure correct Document is set after liveness session cleanup ([6988](https://github.com/holoviz/panel/pull/6988))
- Fix issue detecting PyScript worker ([6998](https://github.com/holoviz/panel/pull/6998))
- Fix `FileDownload` icon alignment ([6981](https://github.com/holoviz/panel/pull/6981))
- Ensure redraw does not error out if `Tabulator` is undefined ([6930](https://github.com/holoviz/panel/pull/6930))
- Guard auth against user being removed ([6908](https://github.com/holoviz/panel/pull/6908))

Documentation

- Add crossfiltering dashboard tutorial ([6630](https://github.com/holoviz/panel/pull/6630))
- Add server video stream tutorial ([6727](https://github.com/holoviz/panel/pull/6727))
- Improve `Param` pane docstring ([6989](https://github.com/holoviz/panel/pull/6989))
- Fix streamz reference notebook ([6980](https://github.com/holoviz/panel/pull/6980))
- Document that `Image` pane is a wrapper around PNG, JPEG, PDF etc. panes ([7004](https://github.com/holoviz/panel/pull/7004))

Date: 2024-05-31

This release primarily addresses a critical regression in notebook comm channel handling introduced in 1.4.3 and includes a few minor fixes for Tabulator and documentation related issues. Many thanks to justinwiley for his first contribution to Panel, twobitunicorn as a returning contributor and the core contributors maximlt and philippjfr for their continued work.

Bug fixes

- Fix notebook CommManager extraction of buffers ([6880](https://github.com/holoviz/panel/pull/6880))
- Fix issue when editing timezone-aware datetime column `Tabulator` ([6879](https://github.com/holoviz/panel/pull/6879))
- Ensure `Tabulator` does not rebuild children when using `embed_content` with `row_content` ([6881](https://github.com/holoviz/panel/pull/6881))
- Ensure `ParamRef`, `ParamFunction` and `ParamMethod` resolve synchronous generators asynchronously ([6885](https://github.com/holoviz/panel/pull/6885))
- Ensure periodic callback cleanup does not error on session warmup ([6886](https://github.com/holoviz/panel/pull/6886))

Documentation

- Update OAuth documentation to correctly reference auth_code provider ([6875](https://github.com/holoviz/panel/pull/6875))
- Fix `CheckBoxGroup` `value` type annotation in reference docs ([6877](https://github.com/holoviz/panel/pull/6877))

Date: 2024-05-23

This patch release is likely the last in the 1.4.x series. The most important fixes in this release are fixes to ensure keyboard shortcuts do not get triggered inside Panel components for for recent versions of JupyterLab, fixes for OAuth token refreshes, and various documentation fixes. The release also includes a small number of enhancements, including improved UX for the `FileSelector`. Many thanks to the many contributors to this release including jrycw, Coderambling, cdeil, twobitunicorn, and the maintainers Hoxbro, MarcSkovMadsen, ahuang11, maximlt and philippjfr.

Enhancements

- Add CSS on mouse interaction with `Card` ([6636](https://github.com/holoviz/panel/pull/6636))
- Make `ChatMessage.reaction_icons` reactive ([6807](https://github.com/holoviz/panel/pull/6807))
- Allow external library to define additional socket handler ([6820](https://github.com/holoviz/panel/pull/6820))
- Allow navigating `FileSelector` with double click ([6843](https://github.com/holoviz/panel/pull/6843))

Bug fixes

- Ensure reference is resolved when passing options to `from_param` ([6762](https://github.com/holoviz/panel/pull/6762))
- Ensure token refresh is always scheduled ([6802](https://github.com/holoviz/panel/pull/6802))
- Fix small memory leak when caching `Design` modifiers ([4978](https://github.com/holoviz/panel/pull/4978))
- Ensure refreshed tokens can be accessed across processes ([6817](https://github.com/holoviz/panel/pull/6817))
- Ensure binary buffers are correctly extracted in notebook `CommManager` ([6818](https://github.com/holoviz/panel/pull/6818))
- Make `Tabulator` resize handling more robust ([6821](https://github.com/holoviz/panel/pull/6821))
- Fix links in `panel convert` index ([6828](https://github.com/holoviz/panel/pull/6828))
- Suppress keyboard shortcuts in notebook output ([6825](https://github.com/holoviz/panel/pull/6825))
- Ensure we don't error out when `FastDesignProvider` is undefined ([6832](https://github.com/holoviz/panel/pull/6832))
- Ensure model changes are applied while session is starting ([6835](https://github.com/holoviz/panel/pull/6835))

Documentation

- Refactor the `hvplot.interactive` tutorial utilizing `pn.rx` ([6700](https://github.com/holoviz/panel/pull/6700))
- Update styling after upgrade to latest pydata-sphinx-theme ([6823](https://github.com/holoviz/panel/pull/6823))
- Fix bug in Reset Jupyterlite script ([6834](https://github.com/holoviz/panel/pull/6834))
- Fix gallery deployment URL ([6831](https://github.com/holoviz/panel/pull/6831))
- Add redirects for old documentation pages ([6833](https://github.com/holoviz/panel/pull/6833))
- Remove Google Analytics ([6836](https://github.com/holoviz/panel/pull/6836))
- Various documentation fixes ([6829](https://github.com/holoviz/panel/pull/6829))
- Fix link in gallery index ([6858](https://github.com/holoviz/panel/pull/6858))