A service is created by a service factory and service factories are functions which are created by a service provider(constructor function).
When instantiating service provider, there must be a property named $get, which holds service factory logic.
The $provide provide helping method for registering services with the help of $injector.
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Method Name
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Type
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Instantiable
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Description
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provider
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Provider
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Yes
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This method registers a service provider
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constant
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object
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No
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Registers a constant service(eg. string, number, array, object or function), accessible to providers and services both.
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value
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object
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No
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Registers a value service(eg. string, number, array, object or function), accessible to services, not providers.
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factory
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function
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Yes
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A factory injects a plain function so AngularJS will call the function in controller. Factory returns the service instance and its provider contain a $get property that holds the factory function.
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service
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class
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No
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A service is an injectable constructor. You can specify the dependency in controller where we want to access service data.
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When we talk about registering a service using value, here value is nothing more than a simple injectable value. The value can be a string, number, array, function, object. The difference between value and constant is, it can not be injected into configuration. It accepts two parameters, that are: name and value.
Syntax is:
value(name, value);
where name is any string and value can be any string, number, object or function.
Here I am explaining a short example of implementing value as a service.
JS file:
var app= angular.module(app,[]);
app.value(username,Alex);
app.controller(userCtrl, function ($scope,username) {
$scope.uname = username;
});
Now, we can get username in our html file:
<body ng-app=app>
<div ng-controller=userCtrl>
{{uname}}
</div>
</body>
For more information you can visit:
https://docs.angularjs.org/api/auto/service/$provide
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