A Command is a function with an extra
canExecute observable property to determine
whether the command can be executed. When executed, a Command function will check the
value of canExecute and throw if false.
This type describes an interface and is not intended to be instantiated directly.
See createCommand to create a command from a function.
成员(属性)
afterExecute : Event
Gets an event which is raised after the command executes, the event
is raised with the return value of the command as its only parameter.
-
默认值:
undefined
beforeExecute : Event
Gets an event which is raised before the command executes, the event
is raised with an object containing two properties: a
cancel property,
which if set to false by the listener will prevent the command from being executed, and
an args property, which is the array of arguments being passed to the command.
-
默认值:
undefined
Gets whether this command can currently be executed. This property is observable.
-
默认值:
undefined