MessageEvent
A message received by a target object.
Properties
Returns true or false depending on how event was initialized. Its return value does not always carry meaning, but true can indicate that part of the operation during which event was dispatched, can be canceled by invoking the preventDefault() method.
Returns the object whose event listener's callback is currently being invoked.
Returns true if preventDefault() was invoked successfully to indicate cancelation, and false otherwise.
Returns the event's phase, which is one of NONE, CAPTURING_PHASE, AT_TARGET, and BUBBLING_PHASE.
Returns the last event ID string, for server-sent events.
Returns the MessagePort array sent with the message, for cross-document messaging and channel messaging.
Returns the WindowProxy of the source window, for cross-document messaging, and the MessagePort being attached, in the connect event fired at SharedWorkerGlobalScope objects.
Returns the object to which event is dispatched (its target).
Returns the event's timestamp as the number of milliseconds measured relative to the time origin.
Functions
Returns the invocation target objects of event's path (objects on which listeners will be invoked), except for any nodes in shadow trees of which the shadow root's mode is "closed" that are not reachable from event's currentTarget.
If invoked when the cancelable attribute value is true, and while executing a listener for the event with passive set to false, signals to the operation that caused event to be dispatched that it needs to be canceled.
Invoking this method prevents event from reaching any registered event listeners after the current one finishes running and, when dispatched in a tree, also prevents event from reaching any other objects.
When dispatched in a tree, invoking this method prevents event from reaching any objects other than the current object.