Emitting a Custom Event to the Parent Scope Hierarchy
To emit an event from a scope, you use the $emit() method. This method sends an event upward through the parent scope hierarchy. Any ancestor scopes that have registered for the event are notified. The $emit() method uses the following syntax, where name is the event name and args is zero or more arguments to pass to the event handler functions:
scope.$emit(name, [args, . . .])
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