EventTarget
EventTarget is a DOM interface implemented by objects that can receive events and may have listeners for them.
See
https://developer.mozilla.org/docs/Web/API/EventTarget
Extended by
VirtualKeyboardFontFaceSetServerBatteryManagerAbortSignalImageSensorWindowScreenOffscreenCanvas
Implements
Constructors
new EventTarget()
new EventTarget(): EventTarget
Returns
Methods
addEventListener()
addEventListener(type, callback, options?): void
Appends an event listener for events whose type attribute value is type. The callback argument sets the callback that will be invoked when the event is dispatched.
The options argument sets listener-specific options. For compatibility this can be a boolean, in which case the method behaves exactly as if the value was specified as options's capture.
When set to true, options's capture prevents callback from being invoked when the event's eventPhase attribute value is BUBBLING_PHASE. When false (or not present), callback will not be invoked when event's eventPhase attribute value is CAPTURING_PHASE. Either way, callback will be invoked if event's eventPhase attribute value is AT_TARGET.
When set to true, options's passive indicates that the callback will not cancel the event by invoking preventDefault(). This is used to enable performance optimizations described in § 2.8 Observing event listeners.
When set to true, options's once indicates that the callback will only be invoked once after which the event listener will be removed.
If an AbortSignal is passed for options's signal, then the event listener will be removed when signal is aborted.
The event listener is appended to target's event listener list and is not appended if it has the same type, callback, and capture.
Parameters
| Parameter | Type |
|---|---|
type | string |
callback | null | EventListenerOrEventListenerObject<any> |
options? | boolean | AddEventListenerOptions |
Returns
void
Implementation of
globalThis.EventTarget.addEventListener
See
https://developer.mozilla.org/docs/Web/API/EventTarget/addEventListener
dispatchEvent()
dispatchEvent(event): boolean
Dispatches a synthetic event event to target and returns true if either event's cancelable attribute value is false or its preventDefault() method was not invoked, and false otherwise.
Parameters
| Parameter | Type |
|---|---|
event | Event |
Returns
boolean
Implementation of
globalThis.EventTarget.dispatchEvent
See
https://developer.mozilla.org/docs/Web/API/EventTarget/dispatchEvent
removeEventListener()
removeEventListener(type, callback, options?): void
Removes the event listener in target's event listener list with the same type, callback, and options.
Parameters
| Parameter | Type |
|---|---|
type | string |
callback | null | EventListenerOrEventListenerObject<any> |
options? | boolean | EventListenerOptions |
Returns
void
Implementation of
globalThis.EventTarget.removeEventListener
See
https://developer.mozilla.org/docs/Web/API/EventTarget/removeEventListener