Transferring the $scope variable from Controller to Service

Question

Transferring the $scope variable from Controller to Service

As I am currently developing a prototype app using Ionic, I find myself diving into the world of Ionic and Angular. In my project, I have created a small JSON API that contains around 25 objects. I have successfully displayed these objects in a list on a page named "Library". Now, my goal is to turn each item in the list into a link that will lead to an individual page called "Lesson". However, I am encountering an issue where the variable $scope.lessonId is set properly in the controller but shows up as undefined in the service. I'm wondering if it's possible to achieve what I am aiming for or if I need to rethink my approach entirely.

.controller('LibraryLessonCtrl', function($scope, $stateParams, LessonService) {
    $scope.lessonId = $stateParams.libraryId;
    console.log($scope.lessonId);

    LessonService.getLessonId()
       .then(function(response){
       $scope.lesson = response;

       console.log($scope.lesson);
  });
})

.service ('LessonService', function($http){
    return { getLessonId: function() {
        return $http.get('api/postsAPI.json')
            .then(function (response, lessonId) {

                console.log(lessonId);

                for(i=0;i<response.data.length;i++){
                    if(response.data[i].post_id == lessonId){
                        return response.data[i];
                    }
                }
            });
        }
    };
})

javascript angularjs ionic-framework

Answer 1

Answer №1

In order to utilize the value inside your service, you must pass your $scope.lessonId variable to your service call.

.controller('LibraryLessonCtrl', function($scope, $stateParams, LessonService) {
   $scope.lessonId = $stateParams.libraryId;
   console.log($scope.lessonId);

   LessonService.getLessonId($scope.lessonId)
      .then(function(response){
        $scope.lesson = response;
        console.log($scope.lesson);
   });
}).service ('LessonService', function($http){
return { getLessonId: function(lessonId) {
    return $http.get('api/postsAPI.json')
        .then(function (response) {

            console.log(lessonId);

            for(i=0;i<response.data.length;i++){
                if(response.data[i].post_id == lessonId){
                    return response.data[i];
                }
            }
        });
    }
};

})

Answer 2

In order to utilize the value inside your service, you must pass your $scope.lessonId variable to your service call.

.controller('LibraryLessonCtrl', function($scope, $stateParams, LessonService) {
   $scope.lessonId = $stateParams.libraryId;
   console.log($scope.lessonId);

   LessonService.getLessonId($scope.lessonId)
      .then(function(response){
        $scope.lesson = response;
        console.log($scope.lesson);
   });
}).service ('LessonService', function($http){
return { getLessonId: function(lessonId) {
    return $http.get('api/postsAPI.json')
        .then(function (response) {

            console.log(lessonId);

            for(i=0;i<response.data.length;i++){
                if(response.data[i].post_id == lessonId){
                    return response.data[i];
                }
            }
        });
    }
};

})

Answer 3

Answer №2

To achieve this, you can pass the Id to the service and store it there instead of relying on $scope variables. It is recommended not to pass $scope variables to services for better code organization. Here's an example implementation:

 .service ('LessonService', function($http){
    var lessonId;
    return { 
        /*other methods*/
        setLessonId: function(id) {
            lessonId = id;
        },
        getLessonId: function(){
          return lessonId;
        }

    };
})

Answer 4

To achieve this, you can pass the Id to the service and store it there instead of relying on $scope variables. It is recommended not to pass $scope variables to services for better code organization. Here's an example implementation:

 .service ('LessonService', function($http){
    var lessonId;
    return { 
        /*other methods*/
        setLessonId: function(id) {
            lessonId = id;
        },
        getLessonId: function(){
          return lessonId;
        }

    };
})

Transferring the $scope variable from Controller to Service

Answer №1

Answer №2

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