dart:html

KeyEvent class

A custom KeyboardEvent that attempts to eliminate cross-browser inconsistencies, and also provide both keyCode and charCode information for all key events (when such information can be determined).

KeyEvent tries to provide a higher level, more polished keyboard event information on top of the "raw" KeyboardEvent.

The mechanics of using KeyEvents is a little different from the underlying KeyboardEvent. To use KeyEvents, you need to create a stream and then add KeyEvents to the stream, rather than using the EventTarget.dispatchEvent. Here's an example usage:

// Initialize a stream for the KeyEvents:
var stream = KeyEvent.keyPressEvent.forTarget(document.body);
// Start listening to the stream of KeyEvents.
stream.listen((keyEvent) =>
    window.console.log('KeyPress event detected ${keyEvent.charCode}'));
...
// Add a new KeyEvent of someone pressing the 'A' key to the stream so
// listeners can know a KeyEvent happened.
stream.add(new KeyEvent('keypress', keyCode: 65, charCode: 97));

This class is very much a work in progress, and we'd love to get information on how we can make this class work with as many international keyboards as possible. Bugs welcome!

Implemented types

• KeyboardEvent

Constructors

KeyEvent(String type, {Window? view, bool canBubble = true, bool cancelable = true, int keyCode = 0, int charCode = 0, int location = 1, bool ctrlKey = false, bool altKey = false, bool shiftKey = false, bool metaKey = false, EventTarget? currentTarget})

factory

Programmatically create a new KeyEvent (and KeyboardEvent).

KeyEvent.wrap(KeyboardEvent parent)

Construct a KeyEvent with parent as the event we're emulating.

Properties

altKey → bool

read-only, override

Calculated value of whether the alt key is pressed is for this event.

bubbles → bool

read-only, inherited

cancelable → bool

read-only, inherited

charCode → int

read-only, override

Calculated value of what the estimated charCode is for this event.

code → String

read-only, override

composed → bool

read-only, inherited

ctrlKey → bool

read-only, override

True if the ctrl key is pressed during this event.

currentTarget → EventTarget?

read-only

The currently registered target for this event.

defaultPrevented → bool

read-only, inherited

detail → int

read-only, override

eventPhase → int

read-only, inherited

hashCode → int

read-only, inherited

The hash code for this object. [...]

isComposed → bool

read-only

isComposing → bool

read-only, override

isTrusted → bool

read-only, inherited

key → String

read-only, override

keyCode → int

read-only, override

Calculated value of what the estimated keyCode is for this event.

location → int

read-only, override

Accessor to the part of the keyboard that the key was pressed from (one of KeyLocation.STANDARD, KeyLocation.RIGHT, KeyLocation.LEFT, KeyLocation.NUMPAD, KeyLocation.MOBILE, KeyLocation.JOYSTICK).

matchingTarget → Element

read-only, inherited

A pointer to the element whose CSS selector matched within which an event was fired. If this Event was not associated with any Event delegation, accessing this value will throw an UnsupportedError.

metaKey → bool

read-only, override

True if the Meta (or Mac command) key is pressed during this event.

path → List<Node>

read-only, inherited

This event's path, taking into account shadow DOM. [...]

repeat → bool

read-only, override

runtimeType → Type

read-only, inherited

A representation of the runtime type of the object.

shiftKey → bool

read-only, override

True if the shift key was pressed during this event.

sourceCapabilities → InputDeviceCapabilities?

read-only, override

target → EventTarget?

read-only, inherited

timeStamp → double

read-only, inherited

type → String

read-only, inherited

view → WindowBase?

read-only, override

which → int

read-only, override

Calculated value of what the estimated keyCode is for this event.

wrapped → Event

final, inherited

Methods

composedPath() → List<EventTarget>

inherited

getModifierState(String keyArgument) → bool

override

noSuchMethod(Invocation invocation) → dynamic

inherited

Invoked when a non-existent method or property is accessed. [...]

preventDefault() → void

inherited

stopImmediatePropagation() → void

inherited

stopPropagation() → void

inherited

toString() → String

inherited

A string representation of this object. [...]

Operators

operator ==(Object other) → bool

inherited

The equality operator. [...]

Static Properties

canUseDispatchEvent → bool

read-only

keyDownEvent ↔ EventStreamProvider<KeyEvent>

read / write

Accessor to provide a stream of KeyEvents on the desired target.

keyPressEvent ↔ EventStreamProvider<KeyEvent>

read / write

Accessor to provide a stream of KeyEvents on the desired target.

keyUpEvent ↔ EventStreamProvider<KeyEvent>

read / write

Accessor to provide a stream of KeyEvents on the desired target.