express.ui.page_opts

express.ui.page_opts(
    title=MISSING,
    window_title=MISSING,
    lang=MISSING,
    theme=MISSING,
    page_fn=MISSING,
    fillable=MISSING,
    full_width=MISSING,
    **kwargs,
)

Set page-level options for the current app.

The arguments to this function get passed to page_auto, which determines which page function should be used based on the page options and the top-level items in the app.

If there is a top-level nav_panel, page_auto will use page_navbar. Otherwise, if there is a top-level sidebar, page_sidebar is used.

If there are neither top-level nav panels nor sidebars, this will use the fillable and full_width arguments to determine which page function to use:

If fillable is True, page_fillable is used.
Otherwise, if full_width is True, page_fluid is used.
If neither are True, page_fixed is used.

Parameters

title : str | MISSING_TYPE = MISSING: A title shown on the page.
window_title : str | MISSING_TYPE = MISSING: The browser window title. If no value is provided, this will use the value of title.
lang : str | MISSING_TYPE = MISSING: ISO 639-1 language code for the HTML page, such as "en" or "ko". This will be used as the lang in the <html> tag, as in <html lang="en">. The default, None, results in an empty string.
theme : str | Path | ui.Theme | ThemeProvider | MISSING_TYPE = MISSING: A custom Shiny theme created using the Theme class, or a path to a local or online CSS file that will replace the Bootstrap CSS bundled by default with a Shiny app. This file should be a complete bootstrap.css or bootstrap.min.css file. For advanced uses, you can also pass a Tagifiable object. In this case, Shiny will suppress the default Bootstrap CSS. To modify the theme of an app without replacing the Bootstrap CSS entirely, use include_css to add custom CSS.
fillable : bool | MISSING_TYPE = MISSING: If there is a top-level sidebar or nav, then the value is passed through to the page_sidebar or page_navbar function. Otherwise, if True, use page_fillable, where the content fills the window; if False (the default), the value of full_width will determine which page function is used.
full_width : bool | MISSING_TYPE = MISSING: This has an effect only if there are no sidebars or top-level navs, and fillable is False. If this is False (the default), use use page_fixed; if True, use page_fillable.
page_fn : Callable[…, Tag] | None | MISSING_TYPE = MISSING: The page function to use. If None (the default), will automatically choose one based on the arguments provided. If not None, this will override all heuristics for choosing page functions.
****kwargs** : object = {}: Additional arguments to pass to the page function. See the description above for further details on how the page function is selected.

Examples

#| standalone: true
#| components: [editor, viewer]
#| layout: vertical
#| viewerHeight: 400

## file: app.py
from shiny.express import ui

ui.page_opts(title="App with Navbar", fillable=True, id="page")

with ui.sidebar():
    ui.input_select("data", "Dataset", ("tips", "flights", "exercise"))

    with ui.panel_conditional("input.page === 'View'"):
        ui.input_select("view", "View", ("plot", "table"))

ui.nav_spacer()

with ui.nav_panel("Data"):
    "This page could be used to pick a dataset."

with ui.nav_panel("View"):
    "This page could be used to view the dataset."
    "Notice the additional controls that appear when 'View' is selected."