AngularJS publisher and subscriber

AngularJS supports the publish and subscribe mechanism to communicate among modules. It uses $emit, $broadcast, and $on to implement, publish and subscribe design pattern. Using $emit and $broadcast, a message can be published inside the AngularJS application. Using the $on method, a published message can be subscribed.

Publishing a message using $emit

When a message is published using $emit, it starts propagating from the current scope to the upper level scope and continues up to the application scope, which is $rootScope. The following code shows the syntax of the $emit method to publish a message:

$scope.$emit("<message>",<argument>);
$rootScope.$emit("<message>",<argument>);

In the previous code, you can see ...

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