Services are singleton
objects. In other words, It's javascript function to perform a specific task.
Angular allow us to use these services with controllers, service, filter or
directive.
Whenever we want to use
service with the above components, we will have to inject the service name
along with the component. By doing so, component ask angular to load that
particular service in the application. This method of injecting service is
called dependency injection.
To use a service, you will
have to add it as a dependency with a component
such as controller, filter or
service. To add a service with component, you have to pass it as an argument.
For Example:
App.controller(“controllerName”,
function($scope, $service))
{
});
In the above example we
injected our $service along with the controller.
There are 2 types of Services
are available in AngulrJS,
1.
Inbuilt
Service
2.
Custom
Service
Inbuilt Service:
AngulaeJS provides many Built-in Services and Each service has
individual functions and characteristics. The built-it services are prefixed by
$ sign.
For Example,
$http, $filter, $route, etc.,
Custom Services:
AngularJS allows users to
create their own Service. You can add any functions and behaviors to the custom
service.
For Example,
app.service('servicename',
function() {
this.maethodname1 =
function() {
......
}
this.methodname2 = function()
{
......
}
});
In the factory method of
creating service, we first create empty object of the factory then we assign properties
and method to it and at last, we return the factory object. Below syntax is
used to create service using factory method.
For Example,
modulename.factory('Factoryname',
function() {
var factory = {};
factory.methodname1 =
function() {
.............
}
factory.methodname2 =
function() {
..............
}
return factory;
});
We can also inject the above
existing factory in to our service.
For Example,
app.service('servicename', function(‘'Factoryname'’)
{
this.maethodname1 =
function() {
......
}
this.methodname2 = function()
{
......
}
});
I hope you got a cleared information about service and Factory. To know more about all other topics, please visit AngularJS Complete Topics.
