Field

Form field layout: labels, descriptions, fieldsets, groups, and validation states.

Interactive Playground

Layout wrapper for a single form field (label, control, description/error).

Argument	Type	Default	Description
...	shiny.tag \| tagList	required	Field contents: label, control, and optional description.
class	character	`NULL`	Custom stylesheet class.

A text label with an optional for attribute linking to its control's input ID.

Argument	Type	Default	Description
...	shiny.tag \| tagList	required	Label text or inline content.
for	character	`NULL`	ID of the control this label describes.
class	character	`NULL`	Custom stylesheet class.

Helper/description text placed below the control element.

Argument	Type	Default	Description
...	shiny.tag \| tagList	required	Helper text content.
id	character	`NULL`	Optional id for aria-describedby wiring.
class	character	`NULL`	Custom stylesheet class.

Flex grid to position multiple fields side-by-side within a form.

Argument	Type	Default	Description
...	shiny.tag \| tagList	required	Child block_field() elements.
class	character	`NULL`	Custom stylesheet class.

A fieldset surface grouping related controls under a single boundary.

Argument	Type	Default	Description
...	shiny.tag \| tagList	required	Legend, field groups, and fields.
class	character	`NULL`	Custom stylesheet class.

A legend caption detailing the purpose of the surrounding fieldset.

Argument	Type	Default	Description
...	shiny.tag \| tagList	required	Legend caption content.
class	character	`NULL`	Custom stylesheet class.

Server-reactive validator that injects data-invalid attributes, aria descriptors, and formatted red error text.

Argument	Type	Default	Description
field	shiny.tag	required	The block_field() to mark invalid.
message	character	required	Validation error message to display.