Constant that uniquely identifies this channel. Will be generated by the service, and guaranteed to be unique within the set of channels registered with the service.
In the case of system channels (see SystemChannel), these IDs should persist across sessions. The
channel list is defined by the service, but can be overridden by a desktop owner. If the desktop owner keeps
this list static (which is recommended), then IDs will also persist across sessions.
Uniquely defines each channel type.
See overrides of this class for list of allowed values.
Event that is fired whenever a window broadcasts on this channel.
This can be triggered by a window belonging to the channel calling the top-level FDC3 broadcast function, or by
any window calling this channel's broadcast method.
Function that should be called whenever a context is broadcast on this channel.
Event that is fired whenever a window joins this channel. This includes switching to/from the default channel.
The event also includes which channel the window was in previously. The channel property within the
event will always be this channel instance.
The event type.
The handler to call when the event is fired.
Event that is fired whenever a window leaves this channel. This includes switching to/from the default channel.
The event also includes which channel the window is being added to. The previousChannel property within the
event will always be this channel instance.
The event type.
The handler to call when the event is fired.
Broadcasts the given context on this channel.
Note that this function can be used without first joining the channel, allowing applications to broadcast on channels that they aren't a member of.
This broadcast will be received by all windows that are members of this channel, except for the window that
makes the broadcast. This matches the behavior of the top-level FDC3 broadcast function.
The context to broadcast to all windows on this channel.
Returns the last context that was broadcast on this channel. All channels initially have no context, until a
window is added to the channel and then broadcasts. If there is not yet any context on the channel, this method
will return null. The context is also reset back into its initial context-less state whenever a channel is
cleared of all windows.
The context of a channel will be captured regardless of how the context is broadcasted on this channel - whether
using the top-level FDC3 broadcast function, or using the channel-level broadcast function on this
object.
NOTE: Only non-default channels are stateful, for the default channel this method will always return null.
Returns a list of all windows belonging to the specified channel.
If the window making the call is a member of this channel, it will be included in the results. If there are no windows on this channel, an empty array is returned.
Adds the given window to this channel. If no identity is provided, the window making the call will be the window added to the channel.
If the channel has a current context (see getCurrentContext) then that context will be immediately passed to the given window upon joining the channel, via its context listener(s).
Note that all windows will always belong to exactly one channel at all times. If you wish to leave a channel,
the only way to do so is to join another channel. A window may rejoin the default channel by calling channels.defaultChannel.join().
The window that should be added to this channel. If omitted, will use the window that calls this method.
Unsubscribes from a particular event.
Has no effect if eventType isn't a valid event, or handler isn't a handler registered against eventType.
The event being unsubscribed from.
The handler function to remove.
Unsubscribes from a particular event.
Has no effect if eventType isn't a valid event, or handler isn't a handler registered against eventType.
The event being unsubscribed from.
The handler function to remove.
Class representing a context channel. All interactions with a context channel happen through the methods on here.
When users wish to generically handle both SystemChannels, AppChannels and the DefaultChannel, generally the Channel type should be used instead of ChannelBase.