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What is service in AngularJS?
AngularJS services are substitutable objects that are wired together using dependency injection (DI). You can use services to organize and share code across your app. AngularJS services are: Lazily instantiated – AngularJS only instantiates a service when an application component depends on it.
Which directive defines the controller?
The controller can be defined as part of directive definition using controller: option. Alternatively, the view of the directive templateURL:’someview. html’ can contain the required controller.
What is Factory in AngularJS with example?
A factory is a simple function which allows us to add some logic to a created object and return the created object. The factory is also used to create/return a function in the form of reusable code which can be used anywhere within the application.
What is the difference between service and factory?
Factory: A factory is a simple function which allows you to add some logic before creating the object. Service: A service is a constructor function which creates the object using new keyword. You can add properties and functions to a service object by using this keyword. Unlike factory, it doesn’t return anything.
Which is better a directive or a controller in angular?
A controller is a good place to start writing something new in angular. Tying a controller to a piece of markup lets you use angular’s already existing library of directives with angular’s existing services. After a very short while of living with this, you’ll realize your controller has gotten too large. Well now its time to refactor.
How are controller and service used in AngularJS?
A new controller will be created for each instance of a view, meaning that if you navigate away from a certain view, and then back again – or if you have more than once instance of a certain view, a new controller will be created each time. Services are typically used as the business logic of your application.
What’s the difference between an angular app and a service?
When writing an angular app, you would have a top-level module which is your application code (without templates). Services are mainly a way to communicate between controllers, but you can inject one service into another. Services are often used as a way to get to your data stores and people will wrap the angular APIs, such as ngResource.
What’s the difference between a directive and a service?
To use a service, dependency injection is required on the dependent (e.g., on the controller, or another service, or a directive). Directives (some of the items below say essentially the same thing, but I’ve found that sometimes a slightly different wording helps a lot) extend HTML vocabulary = teach HTML new tricks.