Question: I understand that `$Broadcast()`, `$Emit()` And `$On()` are used to raise an event in one controller and handling in another controller. If possible, can someone just give me some real time example on the usage of above three as I am new to `angular JS`?

I have gone through the following links and understand the basic usage.

<http://www.binaryintellect.net/articles/5d8be0b6-e294-457e-82b0-ba7cc10cae0e.aspx>

Answer: 
**$emit**

It dispatches an event name upwards through the scope hierarchy and notify to the registered `$rootScope.Scope` listeners. The event life cycle starts at the scope on which `$emit` was called. The event traverses upwards toward the root scope and calls all registered listeners along the way. The event will stop propagating if one of the listeners cancels it.

**$broadcast**

It dispatches an event name downwards to all child scopes (and their children) and notify to the registered `$rootScope.Scope` listeners. The event life cycle starts at the scope on which `$broadcast` was called. All listeners for the event on this scope get notified. Afterwards, the event traverses downwards toward the child scopes and calls all registered listeners along the way. The event cannot be canceled.

**$on**

It listen on events of a given type. It can catch the event dispatched by `$broadcast` and `$emit`.

---

**Visual demo:**

Demo working code, visually showing scope tree (parent/child relationship):  

<http://plnkr.co/edit/am6IDw?p=preview>

Demonstrates the method calls:

```
  $scope.$on('eventEmitedName', function(event, data) ...
  $scope.broadcastEvent
  $scope.emitEvent

```
* Broadcast: We can pass the value from parent to child (i.e parent -> child controller.)
* Emit: we can pass the value from child to parent (i.e.child ->parent controller.)
* On: catch the event dispatched by `$broadcast` or `$emit`.