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@name Developer Guide: Angular Services: Creating Angular Services
@description
-
While angular offers several useful services, for any nontrivial application you'll find it useful
to write your own custom services. To do this you begin by registering a service factory function
that angular's DI will use to create the service object when it is needed.
-
The `angular.service` method accepts three parameters:
-
- `{string} name` - Name of the service.
- `{function()} factory` - Factory function (called just once by DI).
- `{Object} config` - Configuration object with the following properties:
@@ -22,23 +19,19 @@ array. Defaults to `[]`.
instantiated when angular boots. If false, the service will be lazily instantiated when it is first
requested during instantiation of a dependant. Defaults to `false`.
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The `this` of the factory function is bound to the root scope of the angular application.
-
All angular services participate in {@link dev_guide.di dependency injection (DI)} by registering
themselves with angular's DI system (injector) under a `name` (id) as well as by declaring
dependencies which need to be provided for the factory function of the registered service. The
ability to swap dependencies for mocks/stubs/dummies in tests allows for services to be highly
testable.
-
Following is an example of a very simple service. This service depends on the `$window` service
(which is passed as a parameter to the factory function) and is just a function. The service simply
stores all notifications; after the third one, the service displays all of the notifications by
window alert.
-
<pre>
angular.service('notify', function(win) {
var msgs = [];
@@ -53,19 +46,14 @@ window alert.
</pre>
-
-
## Related Topics
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* {@link dev_guide.services.understanding_services Understanding Angular Services}
* {@link dev_guide.services.registering_services Registering Angular Services}
* {@link dev_guide.services.managing_dependencies Managing Service Dependencies}
* {@link dev_guide.services.injecting_controllers Injecting Services Into Controllers }
* {@link dev_guide.services.testing_services Testing Angular Services}
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## Related API
-
* {@link api/angular.service Angular Service API}