FormField<T> class

A single form field that manages its own value, validation, and saving.

Supply a builder callback that returns the visual widget tree, using FormFieldState to access the current value and error state.

Inheritance

Constructors

FormField({Key? key, required T initialValue, String? validator(T?)?, void onSaved(T)?, required Widget builder(FormFieldState<T>)})
Creates a FormField with the given initialValue and optional validator.
const

Properties

builder → Widget Function(FormFieldState<T>)
Builds the visual representation using the current field state.
final
hashCode → int
The hash code for this object.
no setterinherited
initialValue → T
The starting value of the field.
final
key → Key?
Controls how one widget replaces another in the tree.
finalinherited
onSaved → void Function(T)?
Called when the parent Form is saved.
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
validator → String? Function(T?)?
An optional validation function that returns an error string or null.
final

Methods

createElement() → StatefulElement
Creates the Element for this widget.
inherited
createState() → State<FormField<T>>
Creates the mutable state for this widget.
override
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
toString() → String
A string representation of this object.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited