Combobox

Searchable select with type-to-filter, keyboard navigation, and single or multiple modes.

Interactive Playground

R Code

API Reference

block_combobox()

A searchable select (shadcn Command + Popover): type-to-filter over choices with keyboard navigation, single and multiple modes, and the same hidden-native value bridge as block_select().

Argument	Type	Default	Description
input_id	character	required	Shiny input binding identifier.
choices	list \| character	required	List of selectable values/keys.
selected	character \| character[]	`NULL`	Initial selected value; use a vector for multiple mode.
placeholder	character	`NULL`	Prompt text shown on the trigger when selection is empty.
search_placeholder	character	`'Search...'`	Placeholder shown in the type-to-filter box.
empty_message	character	`'No results found.'`	Message shown when the filter matches no choices.
disabled	logical	`FALSE`	Disable user inputs.
width	character	`'100%'`	Dimensions layout width.
style	character	`NULL`	Inline styling string.
size	'default' \| 'sm' \| 'lg'	`'default'`	Sizing dimensions.
invalid	logical	`FALSE`	Apply invalid visual highlights.
multiple	logical	`FALSE`	Allow selecting multiple values.
max_items	integer	`NULL`	Optional maximum selected values in multiple mode.
class	character	`NULL`	Additional styling classes.

update_block_combobox()

Overwrites values, choices, filter/empty text, or input locks from R servers.

Argument	Type	Default	Description
session	ShinySession	required	Active Shiny session object.
input_id	character	required	Target input ID.
choices	list \| character	`NULL`	New selection choices list.
selected	character \| character[]	`NULL`	Value selector key or vector to choose.
search_placeholder	character	`NULL`	Replacement filter-box placeholder.
empty_message	character	`NULL`	Replacement empty-state message.
disabled	logical	`NULL`	Toggle input disabled state.
invalid	logical	`NULL`	Update invalid border styling.