What is the method of utilizing shared services when the controllers do not rely on any shared services?

Let's imagine a scenario where there is a module containing only one factory, which serves as the shared service.

angular.module('sharedService', [])
    .factory('sharedSrv', sharedService)

function sharedService() {
  var number;

  return {
    getNum: getNumber
  };

  function getNumber() {
    return number;
  }

  function setNumber(i) {
    number = i;
  }
}

I have observed that we can inject shared services by including them as dependencies in a module.

angular.module('app', ['sharedService'])
.controller('theCtrl', function(sharedSrv) {
  var self = this;

  self.setSharedNumber = sharedSrv.setNumber;
}

However, how do we inject a shared service if a controller needs to use services specific to its own module?

angular.module('app', ['sharedService'])
.controller('theCtrl', theCtrlFun)
.service('theSrv', theSrvFun)

theCtrlFun.$inject = ['theSrv']

function theCtrlFun(localSrv) {
 // How can we access the shared service here? 
}

function theSrvFun() {
  // Adding some awesome functionalities.
}

Your assistance on this matter would be greatly appreciated.

Answer №1

Instead of injecting the service module as a variable, make sure to pass the name of the module as a string

angular.module('app', [sharedService])
.controller('theCtrl', function(sharedSrv) {

This should be updated to:

angular.module('app', ['sharedService'])
.controller('theCtrl', function(sharedSrv) {

Alternatively, you can use Inline Array annotation for Dependency Injection like this:

angular.module('app', ['sharedService'])
.controller('theCtrl', ["sharedSrv",  function(sharedSrv) {
    //code here
}]);

Answer №2

Take out sharedService from the code

angular.module('app', [sharedService])
because your shared services do not belong to this module.

Make sure to inject theSrv and not theSrvFun in the statement theCtrlFun.$inject = ['theSrv']

In the function theCtrlFun, simply call the method of the service. For example, if someMethod is defined in the service theSrv, you should call it like this:

theSrv.someMethod();

For instance:

angular.module('app', [])
    .controller('theCtrl', theCtrlFun)
    .service('theSrv', theSrvFun)

theCtrlFun.$inject = ['theSrv']

function theCtrlFun(localSrv) {
    theSrv.someMethod(); // calling it this way
}

function theSrvFun() {
    // Adding some amazing features.
}

It is recommended to define Dependency Injection using Array Annotation

angular.module('app', [])
    .controller('theCtrl', ['theSrv', function(theSrv) {

        theSrv.callMe();

    }])
    .service('theSrv', function() {

        this.callMe = funtion() {


        }

    })

Answer №3

Give this a try:

angular.module('app', [])
.controller('theCtrl', theCtrlFunction)
.service('theService', theServiceFunction)

theCtrlFunction.$inject = ['theService']

function theCtrlFunction(sharedService) {
 // How can we access sharedService? 
 console.log(sharedService)
}

function theServiceFunction() {
  // Implementing some amazing functionalities.
}

Run it on plnkr: http://plnkr.co/edit/lSosJbYfG6tuF4pCXYqR?p=preview

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