DropdownButtonFormField<T> class

A convenience widget that wraps a DropdownButton in a FormField.



Creates a DropdownButton widget wrapped in an InputDecorator and FormField. [...]


onChanged ValueChanged<T>
Called when the user selects an item.
autovalidate bool
If true, this form field will validate and update its error text immediately after every change. Otherwise, you must call FormFieldState.validate to validate. If part of a Form that autovalidates, this value will be ignored.
final, inherited
builder FormFieldBuilder<T>
Function that returns the widget representing this form field. It is passed the form field state as input, containing the current value and validation state of this field.
final, inherited
enabled bool
Whether the form is able to receive user input. [...]
final, inherited
hashCode int
The hash code for this object. [...]
read-only, inherited
initialValue → T
An optional value to initialize the form field to, or null otherwise.
final, inherited
key Key
Controls how one widget replaces another widget in the tree. [...]
final, inherited
onSaved FormFieldSetter<T>
An optional method to call with the final value when the form is saved via FormState.save.
final, inherited
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited
validator FormFieldValidator<T>
An optional method that validates an input. Returns an error string to display if the input is invalid, or null otherwise. [...]
final, inherited


createState() FormFieldState<T>
Creates the mutable state for this widget at a given location in the tree. [...]
createElement() StatefulElement
Creates a StatefulElement to manage this widget's location in the tree. [...]
debugDescribeChildren() List<DiagnosticsNode>
Returns a list of DiagnosticsNode objects describing this node's children. [...]
@protected, inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node. [...]
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed. [...]
toDiagnosticsNode({String name, DiagnosticsTreeStyle style }) DiagnosticsNode
Returns a debug representation of the object that is used by debugging tools and by toStringDeep. [...]
toString({DiagnosticLevel minLevel: DiagnosticLevel.debug }) String
Returns a string representation of this object.
toStringDeep({String prefixLineOne: '', String prefixOtherLines, DiagnosticLevel minLevel: DiagnosticLevel.debug }) String
Returns a string representation of this node and its descendants. [...]
toStringShallow({String joiner: ', ', DiagnosticLevel minLevel: DiagnosticLevel.debug }) String
Returns a one-line detailed description of the object. [...]
toStringShort() String
A short, textual description of this widget.


operator ==(dynamic other) bool
The equality operator. [...]