Class: ContentEventObserverService

ContentEventObserverService(windowGlobal, sendAsyncMessage)

Provides the frame script backend for the WebElementEventTarget.

This service receives requests for new DOM events to listen for and to cease listening for, and despatches IPC messages to the browser when they fire.

Constructor

new ContentEventObserverService(windowGlobal, sendAsyncMessage)

Parameters:
Name Type Description
windowGlobal WindowProxy

Window.
sendAsyncMessage nsIMessageSender.sendAsyncMessage

Function for sending an async message to the parent browser.
Source:

Methods

add(type)

Observe a new DOM event.

When the DOM event of type fires, a message is passed to the parent browser's event observer.

If event type is already being observed, only a single message is sent. E.g. multiple registration for events will only ever emit a maximum of one message.

Parameters:
Name Type Description
type string

DOM event to listen for.
Source:

clear()

Ceases observing all previously registered DOM events.

Source:

remove(type)

Ceases observing a DOM event.

Parameters:
Name Type Description
type string

DOM event to stop listening for.
Source: