Accordion

Collapsible content sections with single or multiple open modes and animated panel height.

Interactive Playground

Vertically stacked collapsible sections built from block_accordion_item(); reports open value(s) to input$id when id is set.

Argument	Type	Default	Description
...	block_accordion_item()	required	One or more block_accordion_item() sections.
id	character	`NULL`	Optional input id; input$id reports the open value(s).
type	'single' \| 'multiple'	`'single'`	One open at a time, or any number open independently. Create-only.
collapsible	logical	`FALSE`	Single mode: whether the open item can collapse to none. Create-only.
open	character	`NULL`	Item value(s) open initially. Must match item values.
style	character	`NULL`	Inline styles on the accordion wrapper.
class	character	`NULL`	Additional classes on the accordion wrapper.

A single collapsible section: a trigger title that expands or collapses arbitrary body content.

Argument	Type	Default	Description
value	character	required	Unique item id; reported to input$id and targeted by updates.
title	character \| shiny.tag	required	Trigger label.
...	shiny.tag \| tagList	required	Panel body content.
icon	character \| shiny.tag	`NULL`	Optional leading icon before the title.
disabled	logical	`FALSE`	Whether the item cannot be toggled.
class	character	`NULL`	Additional classes on the item wrapper.

Server-driven update: open or close items by value.

Argument	Type	Default	Description
session	ShinySession	required	Active R/Shiny session.
input_id	character	required	Accordion input id.
open	character	`-`	Item value(s) that should be open after the update; NULL/character(0) closes all.
notify	logical	`TRUE`	Whether Shiny receives an input event after the update.