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$emit() is a function that allows you to send out a message. The $emit method in AngularJS is used to dispatch an event name upwards and up to the $rootScope scope listeners. The $emit propagates the event name upwards and calls all registered listeners along the way. scope listeners and calls all registered listeners along the way.

$emit() is a function that allows you to send out a message. The $emit method in AngularJS is used to dispatch an event name upwards and up to the $rootScope scope listeners. The $emit propagates the event name upwards, towards $rootScope.

The directive uses $rootScope and $emit() to announce interval events. To listen for certain events, use $on(). The directive is unable to make advantage of scope. Because the emitted event never passes across the scope tree, $on() is used in this situation.

Without injecting $scope or $rootScope into the controller, it's impossible to register a $emit or $broadcast event. Using $scope variables and functions is bad practise because the controller instance is already injected into the $scope via the controllerAs syntax.

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