shiny 1.5.0

New features

• Added AI-powered test generator for Shiny applications. Use shiny add test to automatically generate comprehensive Playwright tests for your apps using AI models from Anthropic or OpenAI. (#2041)

• ui.sidebar() is now interactively resizable. (#2020)

• ui.sidebar() gains a fillable argument to support vertical fill behavior in sidebars. (#2077)

• Added ui.insert_nav_panel(), ui.remove_nav_panel(), and ui.update_nav_panel() to support dynamic navigation. (#90)

• navset_card_*() now gains a full_screen option. (#1451)

• ui.update_*() functions now accept ui.TagChild (i.e., HTML) as input to the label and icon arguments. (#2020)

• The .output_*() methods of the ClientData class (e.g., session.clientdata.output_height()) can now be called without an id when called inside a @render function. (#1978)

• playwright.controller.InputActionButton gains a expect_icon() method. As a result, the already existing expect_label() no longer includes the icon. (#2020)

Breaking changes

• The ui.Chat and ui.MarkdownStream components are now imported from the new shinychat library. Future versions of shinychat will likely deprecate and remove some features from Chat. If you still want to use those features with the latest Shiny, we suggest pinning shinychat to it's initial release (v0.1.0). (#2051)

• express.ui.insert_accordion_panel()'s function signature has changed to be more ergonomic. Now you can pass the panel_title and panel_contents directly instead of ui.hold()ing the ui.accordion_panel() context manager. (#2042)

Improvements

• Improved the styling and readability of markdown tables rendered by ui.Chat() and ui.MarkdownStream(). (#1973)

• input_date(), input_date_range(), update_date(), and update_date_range() now support "" for values, mins, and maxes. In this case, no date will be specified on the client. (#1713) (#1689)

• Restricted the allowable types of the choices parameter of input_select(), input_selectize(), update_select(), and update_selectize() to actual set of allowable types (previously, the type was suggesting HTML-like values were supported). (#2048)

• Added module support for session.clientdata methods. This allows you to access client data values in Shiny modules without needing to namespace the keys explicitly. (#1978)

• Added timeout_secs parameter to create_app_fixture to allow testing apps with longer startup times. (#2033)

• Add support for selecting menu items in Navset controllers to improve dropdown navigation test coverage. (#2066)

• Python 3.13 is now offically supported and tested. (#1711)

Bug fixes

• Fixed issue where apps run in Workbench were unexpectedly crashing. Apps running in Workbench will now have ws_per_message_deflate=False enforced. (#2005)

• include_js() and include_css() now work as expected in multi-user settings and also when multiple files from the same directory are included. (#2061, #2069)

• Fixed numerous issues related to programmatically updating selectize options. (#2053)

  • update_selectize(options=...) no longer gets ignored when server=False (the default).
  • update_selectize(options=...) now works as expected in a module.

• Fixed an issue with update_selectize(server=True) not properly displaying labels with HTML reserved characters like "&" (#1330)

• Fixed an issue with ui.Chat() sometimes wanting to scroll a parent element. (#1996)

• Fix several issues with bookmarking error reporting and documentation. (#2076, #1984, #1983)

• input_date() and input_date_range() once again use the client's (not the server) current date as the default value. (#2060)

• Fixed false positive warning in layout_columns() about number of widths vs elements. (#1704)

• Fixed set() method of the InputSelectize test controller so it clears existing selections before applying new values. (#2024)

Deprecations

• ui.update_navs() is deprecated in favor of ui.update_navset(). (#2047)

• ui.panel_well() is deprecated in favor of ui.card(). (#2038)

• selectize, remove_button, and options parameters of ui.input_select() have been deprecated; use ui.input_selectize() instead. (Thanks, @ErdaradunGaztea!) (#1947)

shiny 1.4.0

New features

• Added support for bookmarking Shiny applications. Bookmarking allows users to save the current state of an application and return to it later. This feature is available in both Shiny Core and Shiny Express. (#1870, #1915, #1919, #1920, #1922, #1934, #1938, #1945, #1955)

  • To enable bookmarking in Express mode, set shiny.express.app_opts(bookmark_store=) during the app's initial construction.
  • To enable bookmarking in Core mode, set shiny.App(bookmark_store=) when constructing the app object.

• Added a new .enable_bookmarking(client) method to ui.Chat(). This method will attach bookmark hooks to save and restore the chat's messages and client state. (#1951, #1954)

• Both ui.Chat() and ui.MarkdownStream() now support the inclusion of Shiny UI elements inside of messages. This allows for gathering input from the user (e.g., ui.input_select()), displaying of rich output (e.g., render.DataGrid()), and more. (#1868)

• Added a new .message_stream_context() method to ui.Chat(). This context manager is a useful alternative to .append_message_stream() when you want to: (1) Nest a stream within another and/or (2) Overwrite/replace streaming content. (#1906)

Changes

• Express mode's app_opts() requires all arguments to be keyword-only. If you are using positional arguments, you will need to update your code. (#1895)

• The .get_latest_stream_result() method on ui.MarkdownStream() was deprecated in favor of the new .latest_stream property. Call .result() on the property to get the latest result, .status to check the status, and .cancel() to cancel the stream.

• MarkdownStream() now has a default maximum width of 680px for better readability. Also, similar to Chat(), it now also horizontally centers itself. (#1944)

• ui.page_navbar() and ui.navset_bar() now correctly apply theme and additional attributes from navbar_options created with ui.navbar_options(). (#1942)

Bug fixes

• Fixed an issue where the <main> areas of ui.page_sidebar() and ui.page_navbar() (with a sidebar) were made to be a fillable containers even when fillable=False. (#1816)

• Fixed an issue where the .update_user_input() method on ui.Chat() isn't working in shinylive. (#1891)

• Fixed an issue where width and height on MarkdownStream() were not working as intended. (#1944)

• Fixed an issue with the .click() method on InputActionButton controllers in shiny.playwright.controllers where the method would not work as expected. (#1886)

shiny 1.3.0

New features

• Added a new ui.MarkdownStream() component for performantly streaming in chunks of markdown/html strings into the UI. This component is primarily useful for text-based generative AI where responses are received incrementally. (#1782)

• The ui.Chat() component now supports input suggestion links. This feature is useful for providing users with clickable suggestions that can be used to quickly input text into the chat. This can be done in 2 different ways (see #1845 for more details):

  • By adding a .suggestion CSS class to an HTML element (e.g., <span class="suggestion">A suggestion</span>)
  • Add a data-suggestion attribute to an HTML element, and set the value to the input suggestion text (e.g., <span data-suggestion="Suggestion value">Suggestion link</span>)
  • To auto-submit the suggestion when clicked by the user, include the .submit class or the data-suggestion-submit="true" attribute on the HTML element. Alternatively, use Cmd/Ctrl + click to auto-submit any suggestion or Alt/Opt + click to apply any suggestion to the chat input without submitting.

• The ui.Chat() component also gains the following:

  • The .on_user_submit() decorator method now passes the user input to the decorated function. This makes it a bit easier to access the user input. See the new templates (mentioned below) for examples. (#1801)
  • The assistant icon is now configurable via ui.chat_ui() (or the ui.Chat.ui() method in Shiny Express) or for individual messages in the .append_message() and .append_message_stream() methods of ui.Chat(). (#1853)
  • A new latest_message_stream property was added for an easy way to reactively read the stream's status, result, and also cancel an in progress stream. (#1846)
  • The .append_message_stream() method now returns the reactive.extended_task instance that it launches. (#1846)
  • The ui.Chat() component's .update_user_input() method gains submit and focus options that allow you to submit the input on behalf of the user and to choose whether the input receives focus after the update. (#1851)

• shiny create includes new and improved ui.Chat() template options. Most of these templates leverage the new {chatlas} package, our opinionated approach to interfacing with various LLM. (#1806)

• Client data values (e.g., url info, output sizes/styles, etc.) can now be accessed in the server-side Python code via session.clientdata. For example, session.clientdata.url_search() reactively reads the URL search parameters. (#1832)

• Available input ids can now be listed via dir(input). This also works on the new session.clientdata object. (#1832)

• ui.input_text(), ui.input_text_area(), ui.input_numeric() and ui.input_password() all gain an update_on option. update_on="change" is the default and previous behavior, where the input value updates immediately whenever the value changes. With update_on="blur", the input value will update only when the text input loses focus or when the user presses Enter (or Cmd/Ctrl + Enter for ui.input_text_area()). (#1874)

• Added a new .add_sass_layer_file() method to ui.Theme that supports reading a Sass file with layer boundary comments, e.g. /*-- scss:defaults --*/. This format is supported by Quarto and makes it easier to store Sass rules and declarations that need to be woven into Shiny's Sass Bootstrap files. (#1790)

• Added a new expect_max_height() method to the Valuebox controllers to check the maximum height of a value box (#1816)

• shiny.pytest.create_app_fixture(app) gained support for multiple app file paths when creating your test fixture. If multiple file paths are given, it will behave as a parameterized fixture value and execute the test for each app path. (#1869)

Breaking changes

• The navbar-related style options of ui.page_navbar() and ui.navset_bar() have been consolidated into a single navbar_options argument that pairs with a new ui.navbar_options() helper. Using the direct position, bg, inverse, collapsible, and underline arguments will continue to work with a deprecation message.

  Related to this change, ui.navset_bar() now defaults to using underline=True so that it uses the same set of default ui.navbar_options() as the page variant. In ui.navbar_options(), inverse is replaced by theme, which takes values "light" (dark text on a light background), "dark" (light text on a dark background), or "auto" (follow page settings).

• The Shiny Core component shiny.ui.Chat() no longer has a .ui() method. This method
  was never intended to be used in Shiny Core (in that case, use shiny.ui.chat_ui()) to create the UI element. Note that the shiny.express.ui.Chat() class still has a .ui() method. (#1840)

Bug fixes

• ui.Chat() now correctly handles new ollama.chat() return value introduced in ollama v0.4. (#1787)

• Updated expect_height() for Valuebox controllers to check the height property instead of max-height. (#1816)

shiny 1.2.1

Bug fixes

• Branded theming via ui.Theme.from_brand() now correctly applies monospace inline and block font family choices. (#1762)

• Compatibility with websockets>=14.0, which has changed its public APIs. Shiny now requires websockets 13 or later. (#1769)

shiny 1.2.0

Breaking changes

• .expect_inverse() for Navset controllers in shiny.playwright.controllers now requires a bool value. To keep behavior the same, use .expect_inverse(False). (#1668)

• .expect_layout() for Navset controllers in shiny.playwright.controllers is now renamed to .expect_fluid() and requires a bool value. To keep behavior the same, use .expect_fluid(True) (#1668)

• .expect_icon() for Accordion controllers in shiny.playwright.controllers now requires a bool value instead of a str. (#1710)

New features

• New features for @render.data_frame:

  • Added narwhals support for @render.data_frame. This allows for any eager data frame supported by narwhals to be returned from a @render.data_frame output method. All internal methods and helper methods now leverage the narwhals API to be data frame agnostic. (#1570)

  • Added .data_patched() reactive calculation that applies all .cell_patches() to .data(). (#1719)

  • Added .update_cell_value() method to programmatically update the contents of a data frame cell. (#1719)

  • Added .update_data() method to update the rendered data without resetting any user sort or filter. Note, all user edits will be forgotten. (#1719)

• Added narwhals support for @render.table. This allows for any eager data frame supported by narwhals to be returned from a @render.table output method. (#1570)

• Shiny now supports theming via brand.yml with a single _brand.yml file. Call ui.Theme.from_brand() with __file__ or the path to a _brand.yml file and pass the resulting theme to the theme argument of express.ui.page_opts() (Shiny Express) or ui.page_*() functions (Shiny Core) to apply the brand theme to the entire app. (#1743)

• chat_ui() and Chat.ui() gain a messages parameter for providing starting messages. (#1736)

Other changes

• Incorporated orjson for faster data serialization in @render.data_frame outputs. (#1570)

• Added PageNavbar class to the list of shiny.playwright.controllers for testing ui.page_navbar(). (#1668)

• Added .expect_widths() to NavsetPillList in shiny.playwright.controllers for testing ui.navset_pill_list(widths=). (#1668)

• Added .expect_title() for Popover in shiny.playwright.controllers (#1683)

• Added .expect_disabled() for InputActionButton in shiny.playwright.controllers (#1705)

• Small improvements to the default pulse busy indicator to better blend with any background. It's also now slightly smaller by default.(#1707)

• Added .expect_class(), .expect_gap(), .expect_bg_color(), .expect_desktop_state(), .expect_mobile_state(), .expect_mobile_max_height(), .expect_title(), and .expect_padding() for Sidebar in shiny.playwright.controllers (#1715)

• Modified .expect_text() for Sidebar in shiny.playwright.controllers to use .loc_content instead of loc for text. Also modified .expect_width() to check the .loc_container's style instead of the .loc element. (#1715)

• Modified .expect_text() and .expect_width() for Sidebar in shiny.playwright.controllers to use loc_content instead of loc for text. (#1715)

• Added .expect_class() and .expect_multiple() for Accordion in shiny.playwright.controllers (#1710)

Bug fixes

• A few fixes for ui.Chat(), including:

  • Fixed a bug with Chat() sometimes silently dropping errors. (#1672)
  • Fixed a bug with Chat() sometimes not removing it's loading icon (on error or a None transform). (#1679)
  • .messages(format="anthropic") correctly removes non-user starting messages (once again). (#1685)

• shiny create now uses the template id rather than the directory name as the default directory. (#1666)

• ui.Theme() now works correctly on Windows when the theme requires Sass compilation. (Thanks, @yuuuxt!) (#1684)

• Fixed multiple input controllers (InputSlider, InputDate, InputDateRange, InputCheckbox, and InputCheckboxGroup) in shiny.playwright.controller to check the width property within the style attribute. (#1691, #1696, #1702)

• Fixed multiple input controllers (InputSwitch, InputRadioButtons, InputNumeric, InputText, InputTextArea, InputPassword, InputActionButton, and InputActionLink) in shiny.playwright.controller to correctly validate the width style property in `.expect_width(). (#1705)

• Fixed input controller InputTextArea in shiny.playwright.controller to correctly validate the resize style property in .expect_resize(). (#1705)

• Fixed a bug in ui.conditional_panel() that would cause the panel to repeatedly show/hide itself when the provided condition did not evaluate to a boolean value. (#1707)

• Fixed a bug with ui.input_slider() when used as a range slider that made it impossible to change the slider value when both handles were at the maximum value. (#1707)

• Fixed bug in @render.data_frame where bool or object columns were not being rendered. (#1570)

• Fixed output controller OutputDataFrame in shiny.playwright.controller to correctly assert the number of rows in .expect_nrow() as the total number of virtual rows, not the number of currently displaying rows. (#1719)

• Fixed issue where @render.download did not respect the module namespacing. (Thanks, @nsiicm0!) (#1732)

• Added workaround in Accordion in shiny.playwright.controller where .expect_open() and .expect_panels() would hang while resolving a playwright locator. (Thanks, @joesho112358!) (#1165)

Shiny 1.1.0

New features

• ui.Chat() gains a new .update_user_input() method, which adds the ability to update the input placeholder message. As a result, .set_user_message() is now deprecated (since the new method can also be used to update the message). (#1594)

• shiny create now supports a succinct format for specifying the GitHub repository via the --github flag, e.g. --github posit-dev/py-shiny-templates. You can now also use --github and --template together, in which case --github should point to a repository containing a directory matching the name provided in --template. (#1623)

• shiny create now identifies templates in external repositories using a _template.json metadata file. This file should contain at an "id" and optionally a "title" and "description". When shiny create is called with the --github flag but without a --template flag, it will offer a menu listing all available templates in the repository. (#1631)

Other changes

• A few changes for ui.Chat(), including:
  • The .messages() method no longer trims messages by default (i.e., the default value of token_limits is now None instead of the overly generic and conservative value of (4096, 1000)). See the new generative AI in production templates (via shiny create) for examples of setting token_limits based on the model being used. (#1657)
  • User input that contains markdown now renders the expected HTML. (#1607)
  • Busy indication is now visible/apparent during the entire lifecycle of response generation. (#1607)

Bug fixes

• A few fixes for ui.Chat(), including:

  • A fix for use inside Shiny modules. (#1582)
  • .messages(format="google") now returns the correct role. (#1622)
  • ui.Chat(messages) are no longer dropped when dynamically rendered. (#1593)
  • transform_assistant_response can now return None and correctly handles change of content on the last chunk. (#1641)

• An empty ui.input_date() value no longer crashes Shiny. (#1528)

• Fixed bug where calling .update_filter(None) on a data frame renderer did not visually reset non-numeric column filters. (It did reset the column's filtering, just not the label). Now it resets filter's label. (#1557)

• Require shinyswatch >= 0.7.0 and updated examples accordingly. (#1558)

• ui.input_text_area(autoresize=True) now resizes properly even when it's not visible when initially rendered (e.g. in a closed accordion or a hidden tab). (#1560)

• ui.notification_show(duration=None) now persists the notification until the app user closes it. (#1577)

• Some copies of Windows 10 have registry entries mapping .js files to content type "text/plain", which was causing all sorts of problems for browsers. (#1624)

• Added missing support for express.ui.navset_card_pill(placement:). (#1602)

• Added .expect_sidebar() and .expect_title() methods for NavsetCardTab, NavsetCardPill, NavsetCardUnderline, and NavsetBar. (#1602)

• Added .expect_placement() method for NavsetCardPill and NavsetCardUnderline. (#1602)

Shiny 1.0.0

New features

• Added a new shiny.ui.Chat class for building conversational interfaces with fully customizable and performant response generation. (#1453)

• Expose shiny.playwright, shiny.run, and shiny.pytest modules that allow users to testing their Shiny apps. (#1448, #1456, #1481)

  • shiny.playwright contains controller and expect submodules. controller will contain many classes to interact with (and verify!) your Shiny app using Playwright. expect contains expectation functions that enhance standard Playwright expectation methods.
  • shiny.run contains the run_shiny_app command and the return type ShinyAppProc. ShinyAppProc can be used to type the Shiny app pytest fixtures.
  • shiny.pytest contains pytest test fixtures. The local_app pytest fixture is automatically available and runs a sibling app.py file. Where as create_app_fixture(PATH_TO_APP) allows for a relative path to a Shiny app to be instantiated from a different folder.

• Added CLI command shiny add test to add a test file to an existing Shiny app. (#1461)

• @render.data_frame, render.DataGrid, and render.DataTable now support polars data frames (#1474).

• @render.data_frame, render.DataGrid, and render.DataTable are now type aware. This means that the data frame renderer object's .data() and .data_view() methods will return the same type of data given the the renderer. E.g. If a DataGrid wrapping a polars data frame is returned to the renderer function, .data_view() will return polars data. (#1502)

• @render.data_frame's render.DataGrid and render.DataTable added support for cell styling with the new styles= parameter. This parameter can receive a style info object (or a list of style info objects), or a function that accepts a data frame and returns a list of style info objects. Each style info object can contain the rows and cols locations where the inline style and/or CSS class should be applied. (#1475)

• @render.data_frame has added a few new methods:

  • .data_view_rows() is a reactive value representing the sorted and filtered row numbers. This value wraps input.<ID>_data_view_rows()(#1374)
  • .sort() is a reactive value representing the sorted column information (dictionaries containing col: int and desc: bool). This value wraps input.<ID>_sort(). (#1374)
  • .filter() is a reactive value representing the filtered column information (dictionaries containing col: int and value which is either a string or a length 2 array of at least one non-None number). This value wraps input.<ID>_filter(). (#1374)
  • .update_sort(sort=) allows app authors to programmatically update the sorting of the data frame. (#1374)
  • .update_filter(filter=) allows app authors to programmatically update the filtering of the data frame. (#1374)

• @render.data_frame now accepts both a non-"none" selection_mode value and editable=True. (#1454, #1534)

• @render.data_frame's <ID>.cell_selection() no longer returns a None value and now always returns a dictionary containing both the rows and cols keys. This is done to achieve more consistent author code when working with cell selection. When the value's type="none", both rows and cols are empty tuples. When type="row", cols represents all column numbers of the data. In the future, when type="col", rows will represent all row numbers of the data. These extra values are not available in input.<ID>_cell_selection() as they are independent of cells being selected and are removed to reduce information being sent to and from the browser. (#1376)

• Relative imports, like from . import utils, now can be used in Shiny Express apps. (#1464)

• ui.Theme allows you to create custom themes for your Shiny app by recompiling Bootstrap and Shiny's Sass files with your own customizations. Themes created with ui.Theme can be passed directly to the theme argument of express.ui.page_opts() (Shiny Express) or ui.page_*() functions (Shiny Core) to apply the theme to the entire app. This feature requires the libsass package which can be installed with pip install libsass. (#1358)

• ui.card_body() can be used to wrap the contents of elements in ui.card(), allowing you to change parameters like fillable or padding and gap for groups of elements in the card. (#1506)

Other changes

• ui.input_action_button() and ui.update_action_button() gain a disabled argument. When the button is disabled, it appears grayed out and cannot be clicked. (#1465)

• The main content area of ui.page_sidebar() and ui.page_navbar() with a page-level sidebar now have a minimum height and width to avoid squashed content in fillable layouts. The minimum height and width are controllable via --bslib-page-main-min-{width,height} CSS variables. (#1436)

• Added a new option to place an always-open sidebar above the main content on mobile screens by providing open={"mobile": "always-above"} to ui.sidebar(). (#1436)

Bug fixes

• Fixed #1440: When a Shiny Express app with a www/ subdirectory was deployed to shinyapps.io or a Connect server, it would not start correctly. (#1442)

• Fixed #1498: Update table related TypeScript dependencies to their latest versions. This fixed an issue where the Row Virtualizer would scroll to the end when hidden. This would cause the DOM to update numerous times, locking up the browser tab for multiple seconds. (#1524, #1550)

• The return type for the data frame patch function now returns a list of render.CellPatch objects (which support htmltools.TagNode for the value attribute). These values will be set inside the data frame's .data_view() result. This also means that .cell_patches() will be a list of render.CellPatch objects. (#1526)

• Made sure all @render.data_frame cells that have been edited are now restored back to ready state to handle the off chance that the returned patches are at different locations the the original edit patches. (#1529)

• remove_all_fill(tag) no longer modifies the original tag input and instead returns a modified copy of tag. (#1538)

Deprecations

• The following deprecated functions have now been removed (#1546):

  • shiny.ui.panel_sidebar() was deprecated in v0.6.0; use shiny.ui.sidebar() instead.
  • shiny.ui.panel_main() was deprecated in v0.6.0; instead pass items directly to shiny.ui.layout_sidebar().
  • shiny.ui.navset_pill_card() was deprecated in v0.6.0; use shiny.ui.navset_card_pill() instead.
  • shiny.ui.navset_tab_card() was deprecated in v0.6.0; use shiny.ui.navset_card_tab() instead.
  • shiny.ui.nav() was deprecated in v0.6.1; use shiny.ui.nav_panel() instead.

• @render.data_frame, render.DataGrid, and render.DataTable have deprecated support for data frame types that are pandas compatible. Please call .to_pandas() on your data before it is returned to the renderer (#1502). Currently, both polars and pandas data frames are supported (#1474). If you'd like to add support for a new data frame type, please open an issue or a pull request.

• @render.data_frame's .cell_selection() will no longer return None when the selection mode is "none". In addition, missing rows or cols information will be populated with appropiate values. This allows for consistent handling of the cell selection object. (#1374)

• @render.data_frame's input value input.<ID>_data_view_indices() has been deprecated. Please use <ID>.data_view_rows() to retrieve the same information. (#1377)

• @render.data_frame's input value input.<ID>_column_sort() has been deprecated. Please use <ID>.sort() to retrieve the same information. (#1374)

• @render.data_frame's input value input.<ID>_column_filter() has been deprecated. Please use <ID>.filter() to retrieve the same information. (#1374)

• Deprecated functions in shiny.experimental have been removed. By and large, these functions are now available in the main shiny namespace. (#1540)

• We've deprecated several card-related shiny.experimental.ui functions that were moved to the main shiny.ui namespace in v0.6.0. Both card() and card_body() are no longer experimental and can be called via shiny.ui.card() and shiny.ui.card_body() directly. shiny.experimental.ui.card_title() is now deprecated, but can be replaced with shiny.ui.tags.h5() or shiny.ui.card_header(). (#1543)

Shiny 0.10.2

Bug fixes

• Fixed an issue with output spinners only showing for a split second. (#1429)

Shiny 0.10.1

Bug fixes

• Fixed an issue with opacity dimming occurring too often/quickly when outputs are recalculating. (#1415)

Shiny 0.10.0

Deprecations

• Restored @render.data_frame's (prematurely removed in v0.9.0) input value input.<ID>_selected_rows(). Please use <ID>.cell_selection()["rows"] and consider input.<ID>_selected_rows() deprecated. (#1345, #1377)

• @render.data_frame's method .input_cell_selection() has been renamed to .cell_selection(). Please use .cell_selection() and consider .input_cell_selection() deprecated. (#1407)

• @render.data_frame's input value input.<ID>_data_view_indices has been renamed to input.<ID>_data_view_rows for consistent naming. Please use input.<ID>_data_view_rows and consider input.<ID>_data_view_indices deprecated. (#1377)

New features

• Added busy indicators to provide users with a visual cue when the server is busy calculating outputs or otherwise serving requests to the client. More specifically, a spinner is shown on each calculating/recalculating output, and a pulsing banner is shown at the top of the page when the app is otherwise busy. Use the new ui.busy_indicator.options() function to customize the appearance of the busy indicators and ui.busy_indicator.use() to disable/enable them. (#918)

• Added support for creating modules using Shiny Express syntax, and using modules in Shiny Express apps. (#1220)

• ui.page_*() functions gain a theme argument that allows you to replace the Bootstrap CSS file with a new CSS file. theme can be a local CSS file, a URL, or a shinyswatch theme. In Shiny Express apps, theme can be set via express.ui.page_opts(). (#1334)

Bug fixes

• Fixed an issue that prevented Shiny from serving the font.css file referenced in Shiny's Bootstrap CSS file. (#1342)

• Removed temporary state where a data frame renderer would try to subset to selected rows that did not exist. (#1351, #1377)

• Fix an issue in the data frame output which caused the table to freeze when filters removed previously selected cells. (#1412)

Other changes

• Session is now an abstract base class, and AppSession is a concrete subclass of it. Also, ExpressMockSession has been renamed ExpressStubSession and is a concrete subclass of Session. (#1331)

• The Session class now has a method is_stub_session(). For ExpressStubSession, this method returns True for , and AppSession objects it returns False. (#1331)

• Closed #1293: The error console would display error messages if an app was disconnected and the user changed an input. (#1339)

• Fixed an issue where some CSS files were larger than necessary because they had source maps embedded in them. (#1339)