Angular Providers
Provider
Provider is available both in configuration and run phases.
The Provider recipe is syntactically defined as a custom type that implements a $get method.
You should use the Provider recipe only when you want to expose an API for application-wide configuration that must be made before the application starts. This is usually interesting only for reusable services whose behavior might need to vary slightly between applications.
angular.module('app',[])
.provider('endpointProvider', function() {
var uri = 'n/a';
this.set = function(value) {
uri = value;
};
this.$get = function() {
return {
get: function() {
return uri;
}
};
};
})
.config(function(endpointProviderProvider) {
endpointProviderProvider.set('http://some.rest.endpoint');
})
.controller('MainCtrl', function(endpointProvider) {
var vm = this;
vm.endpoint = endpointProvider.get();
});
<body ng-controller="MainCtrl as vm">
<div>endpoint = {{::vm.endpoint }}</div>
</body>Without config phase result would be
endpoint = n/a
Factory
Factory is available in run phase.
The Factory recipe constructs a new service using a function with zero or more arguments (these are dependencies on other services). The return value of this function is the service instance created by this recipe.
Factory can create a service of any type, whether it be a primitive, object literal, function, or even an instance of a custom type.
angular.module('app',[])
.factory('endpointFactory', function() {
return {
get: function() {
return 'http://some.rest.endpoint';
}
};
})
.controller('MainCtrl', function(endpointFactory) {
var vm = this;
vm.endpoint = endpointFactory.get();
});
<body ng-controller="MainCtrl as vm">
<div>endpoint = {{::vm.endpoint }}</div>
</body>Constant
Constant is available both in configuration and run phases.
angular.module('app',[])
.constant('endpoint', 'http://some.rest.endpoint') // define
.config(function(endpoint) {
// do something with endpoint
// available in both config- and run phases
})
.controller('MainCtrl', function(endpoint) { // inject
var vm = this;
vm.endpoint = endpoint; // usage
});
<body ng-controller="MainCtrl as vm">
<div>endpoint = {{ ::vm.endpoint }}</div>
</body>