sidebar: Sidebar layouts

View source: R/sidebar.R

sidebarR Documentation



Sidebar layouts place UI elements, like input controls or additional context, next to the main content area which often holds output elements like plots or tables.

There are several page, navigation, and layout functions that allow you to create a sidebar layout. In each case, you can create a collapsing sidebar layout by providing a sidebar() object to the sidebar argument the following functions.

  • page_sidebar() creates a "page-level" sidebar.

  • page_navbar() creates a multi-panel app with an (optional, page-level) sidebar that is shown on every panel.

  • layout_sidebar() creates a "floating" sidebar layout component which can be used inside any page() and/or card() context.

  • navset_card_tab() and navset_card_pill() create multi-tab cards with a shared sidebar that is accessible from every panel.

See the Sidebars article on the bslib website to learn more.


  width = 250,
  position = c("left", "right"),
  open = NULL,
  id = NULL,
  title = NULL,
  bg = NULL,
  fg = NULL,
  class = NULL,
  max_height_mobile = NULL,
  gap = NULL,
  padding = NULL

  sidebar = NULL,
  fillable = TRUE,
  fill = TRUE,
  bg = NULL,
  fg = NULL,
  border = NULL,
  border_radius = NULL,
  border_color = NULL,
  padding = NULL,
  gap = NULL,
  height = NULL

toggle_sidebar(id, open = NULL, session = get_current_session())



Unnamed arguments can be any valid child of an htmltools tag and named arguments become HTML attributes on returned UI element. In the case of layout_sidebar(), these arguments are passed to the main content tag (not the sidebar+main content container).


A valid CSS unit used for the width of the sidebar.


Where the sidebar should appear relative to the main content.


The initial state of the sidebar, choosing from the following options:

  • "desktop": The sidebar starts open on desktop screen, closed on mobile. This is default sidebar behavior.

  • "open" or TRUE: The sidebar starts open.

  • "closed" or FALSE: The sidebar starts closed.

  • "always" or NA: The sidebar is always open and cannot be closed.

Alternatively, you can use a list with desktop or mobile items to set the initial sidebar state independently for desktop and mobile screen sizes. In this case, desktop or mobile can use any of the above options except "desktop", which is equivalent to list(desktop = "open", mobile = "closed").

In sidebar_toggle(), open indicates the desired state of the sidebar, where the default of open = NULL will cause the sidebar to be toggled open if closed or vice versa. Note that sidebar_toggle() can only open or close the sidebar, so it does not support the "desktop" and "always" options.


A character string. Required if wanting to re-actively read (or update) the collapsible state in a Shiny app.


A character title to be used as the sidebar title, which will be wrapped in a ⁠<header>⁠ element with class sidebar-title. You can also provide a custom htmltools::tag() for the title element, in which case you'll likely want to give this element class = "sidebar-title".

bg, fg

A background or foreground color. If only one of either is provided, an accessible contrasting color is provided for the opposite color, e.g. setting bg chooses an appropriate fg color.


CSS classes for the sidebar container element, in addition to the fixed .sidebar class.


A CSS length unit defining the maximum height of the horizontal sidebar when viewed on mobile devices. Only applies to always-open sidebars that use open = "always", where by default the sidebar container is placed below the main content container on mobile devices.


A CSS length unit defining the vertical gap (i.e., spacing) between adjacent elements provided to ....


Padding within the sidebar itself. This can be a numeric vector (which will be interpreted as pixels) or a character vector with valid CSS lengths. padding may be one to four values. If one, then that value will be used for all four sides. If two, then the first value will be used for the top and bottom, while the second value will be used for left and right. If three, then the first will be used for top, the second will be left and right, and the third will be bottom. If four, then the values will be interpreted as top, right, bottom, and left respectively.


A sidebar() object.


Whether or not the main content area should be considered a fillable (i.e., flexbox) container.


Whether or not to allow the layout container to grow/shrink to fit a fillable container with an opinionated height (e.g., page_fillable()).


Whether or not to add a border.


Whether or not to add a border radius.


The border color that is applied to the entire layout (if border = TRUE) and the color of the border between the sidebar and the main content area.


Any valid CSS unit (e.g., height="200px"). Doesn't apply when a card is made full_screen (in this case, consider setting a height in card_body()).


A Shiny session object (the default should almost always be used).


  • toggle_sidebar(): Toggle a sidebar() state during an active Shiny user session.


Sidebar layouts are featured in a number of pages on the bslib website:

bslib documentation built on May 29, 2024, 6:31 a.m.