Talking between Controllers using $emit, $broadcast and $on in AngularJS

AngularJS provides $on, $emit, and $broadcast services for event-based communication between controllers.

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The key thing to remember when using $scope to fire your events, is that they will communicate only with immediate parent or child scopes only! Scopes aren’t always child and parent. We might have sibling scopes. Using $scope to fire an event will miss out sibling scopes, and just carry on up! They do not go sideways!

So to solve this problem we can use $broadcast and $emit.

$broadcast

We could fire an event down from ParentCtrl to SiblingOneCtrl using $broadcast:

$emit

If we wanted to communicate upwards, from SiblingOneCtrl to ParentCtrl, you guessed it, we can use $emit.