What is the proper way to implement parameters and dependency injection within a service?

Question

What is the proper way to implement parameters and dependency injection within a service?

My objective is to achieve the following:

    (function(){angular.module('app').factory("loadDataForStep",ls);
        ls.$inject = ['$scope','stepIndex']
        function ls ($scope, stepIndex) {
            if ($routeParams.code != undefined) {
                $scope.code = $routeParams.code;
                $scope.retrieveData($routeParams.code);
            }
            $rootScope.stepIndex = stepIndex-1;
            $rootScope.currentStep = stepIndex;
            $rootScope.resultsLoaded = false;
            if (!fieldDefinitionsLoaded) {
                loadAllElementsDefinition();
                loadStepsWithOverrides(stepIndex, loadStep);
            } else {
                loadStep(stepIndex);
            }
    }
    })();

Although I am aware of several issues in this code snippet, my current focus is on addressing the question: How can I successfully inject $scope and pass step index as a parameter? It is evident that $scope must be obtained from Angular, while the step index needs to be provided. Any assistance would be greatly valued.

javascript angularjs dependency-injection

Answer 1

Answer №1

It is not possible to inject scope in a factory because services do not have access to scope.

The scope belongs to an instance of a controller.

If you need to work with the scope object in a factory, you can declare a variable in the factory and then bind that variable to the scope.

To achieve this, you can use the following approach:


var app = angular.module("app", []);
app.factory("mySvc", function() {
  return {
    dataList: []
  }
});

app.controller("myCtrl", function($scope, mySvc) {
  $scope.model = mySvc;
  console.log($scope.model);
});

Answer 2

It is not possible to inject scope in a factory because services do not have access to scope.

The scope belongs to an instance of a controller.

If you need to work with the scope object in a factory, you can declare a variable in the factory and then bind that variable to the scope.

To achieve this, you can use the following approach:


var app = angular.module("app", []);
app.factory("mySvc", function() {
  return {
    dataList: []
  }
});

app.controller("myCtrl", function($scope, mySvc) {
  $scope.model = mySvc;
  console.log($scope.model);
});

What is the proper way to implement parameters and dependency injection within a service?

Answer №1

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