CODEWITHSUNDEEP
angularjs
zod
zod

Reputation: 2788

Is it normal to use $broadcast in angularjs?

I have a search controller, where the user can search for a single area. After an area is searched, I $rootScope.$broadcast that the area has changed.

I have various other controllers that are responsible for independently loading and showing data about that area. They use $rootScope.$on, and get extra information from other sources using $http.

Is my approach the normal way of doing things? It feels unusual, since $broadcast wasn't mentioned in the tutorials I have been through.

I am trying to learn angular.

Upvotes: 0

Views: 59

Answers (1)

Walfrat
Walfrat

Reputation: 5353

$emit/$broadcast are used a lot in angular libraries and even 3rd parties.

For instance you have events when navigating using the ng-route module, $routeChangeStart, $routeChangeSuccess, ... same goes for the 3rd party ui-router : $stateChangeStart, $stateChangeSuccess,....

It's just an event bus : listening and sending events in order to communicate with external components.

In angularJS, you will find them in the event part of the documentation.

However you should be carefull with events, too many of them can lead to lost control of what you're code is doing or be able to tell what should be the current state of your app.

It's possible for some that a cleaner way of doing it is tostore data in $rootScope/a service an use $watch on them.

EDIT : i didn't mention it but storing data in $rootScope is not advised for design/reusability.isoltion purpose.

Upvotes: 2

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