Incorrect scope value detected in Angular controller

Question

Incorrect scope value detected in Angular controller

I recently started learning Angular 1, and I've encountered an issue with my code:

var app = angular.module("Football", []);

app.factory("competitions", ['$http', function($http) {
  return $http.get("json/competitions.json")
  .success(function(response) {

    var data = {
      response: response,
      teams: []
    };

    for (var i = 0; i < response.length; i++) {

      $http.get("json/teams.json")
      .success(function(response2) {
        data.teams.push(response2);
        return data
      })
      .error(function(err) {
        return err;
      });
    }

  })
  .error(function(err) {
    return err;
  });
}]);


app.controller('MainController', ['$scope', "competitions", function($scope, competitions) {
  competitions.success(function(data) {
    $scope.competitions = data;
  });
}]);

I am attempting to transfer the data from the competitions factory to $scope.competitions in MainController. However, only the response is being passed to the controller, which I recognize as incorrect. I'm unsure of how to rectify this mistake. Can anyone offer some assistance?

javascript angularjs angularjs-factory

Answer 1

Answer №1

Here are a few corrections that need to be made in your code.

Avoid using the outdated .success() and .error() functions, and switch to using .then().
The .success() function has four parameters, with the first one being the actual data returned. Instead of treating response as the entire response, extract the data from it when using .then().
Consider utilizing the $q library to create and return your own promise within the factory. Extract this data in the controller where necessary.
Avoid looping directly off of response, as it may not always be an array. It could be a wrapper containing the actual data instead.
Ensure you handle the returned data and err from the teams.json promise appropriately, as they seem to be missing in your implementation.
As promises can take time to resolve, consider invoking the teams.json call from the controller rather than the factory. Use a dummy placeholder inside an ng-repeat in the scope initially and replace it with the actual data once it's fetched.

Answer 2

Here are a few corrections that need to be made in your code.

Avoid using the outdated .success() and .error() functions, and switch to using .then().
The .success() function has four parameters, with the first one being the actual data returned. Instead of treating response as the entire response, extract the data from it when using .then().
Consider utilizing the $q library to create and return your own promise within the factory. Extract this data in the controller where necessary.
Avoid looping directly off of response, as it may not always be an array. It could be a wrapper containing the actual data instead.
Ensure you handle the returned data and err from the teams.json promise appropriately, as they seem to be missing in your implementation.
As promises can take time to resolve, consider invoking the teams.json call from the controller rather than the factory. Use a dummy placeholder inside an ng-repeat in the scope initially and replace it with the actual data once it's fetched.

Answer 3

Answer №2

Give this a shot

    var app = angular.module("Soccer", []);

app.factory("leagues", ['$http', '$q', function ($http, $q) {
  function getLeagues(){
    return $http.get('json/leagues.json');
  }
  return {
    retrieve: function(){
      var primaryTask = $q.defer();
      getLeagues().then(function(response){
        var leagueData = {
          leagues: response.data,
          teams:[]
        }
        var tasks = [];
        for(var i=0;i<leagueData.leagues.length;i++){
          tasks.push($http.get("json/teams.json"));
        }
        $q.all(tasks).then(function(responses){
          for(var j = 0;j<responses.length;j++){
            leagueData.teams.push(responses[i]);
          }
          primaryTask.resolve(leagueData);
        }).catch(function(error){
          primaryTask.reject(error);
        })
      }).catch(function(error){
        primaryTask.reject(error);
      }) 
      return primaryTask.promise;
    }
  }
}]);


app.controller('PrimaryController', ['$scope', "leagues", function ($scope, leagues) {
  leagues.retrieve().then(function(data){
    $scope.leagues = data;
  }).catch(function(error){
    //handle error here
  })
}]);

Answer 4

Give this a shot

    var app = angular.module("Soccer", []);

app.factory("leagues", ['$http', '$q', function ($http, $q) {
  function getLeagues(){
    return $http.get('json/leagues.json');
  }
  return {
    retrieve: function(){
      var primaryTask = $q.defer();
      getLeagues().then(function(response){
        var leagueData = {
          leagues: response.data,
          teams:[]
        }
        var tasks = [];
        for(var i=0;i<leagueData.leagues.length;i++){
          tasks.push($http.get("json/teams.json"));
        }
        $q.all(tasks).then(function(responses){
          for(var j = 0;j<responses.length;j++){
            leagueData.teams.push(responses[i]);
          }
          primaryTask.resolve(leagueData);
        }).catch(function(error){
          primaryTask.reject(error);
        })
      }).catch(function(error){
        primaryTask.reject(error);
      }) 
      return primaryTask.promise;
    }
  }
}]);


app.controller('PrimaryController', ['$scope', "leagues", function ($scope, leagues) {
  leagues.retrieve().then(function(data){
    $scope.leagues = data;
  }).catch(function(error){
    //handle error here
  })
}]);

Answer 5

Answer №3

In order to tackle your issue effectively, my suggestion would be to initiate an initial request for the competitions, then consolidate all subsequent requests and resolve them using $q.all. Refer to this jsbin example for further clarity: http://jsbin.com/sugonifayi/1/edit?html,js,console

var app = angular.module("AngularApp", ['test']);

angular.module('test', [])
  .controller('TestController', ['$scope', 'CompetitionsService', function ($scope, CompetitionsService) {
    $scope.competitions = [];

    CompetitionsService.getCompetititons().then(function (response) {
      $scope.competitions = response;
      console.log($scope.competitions);
    });
  }])
.service('CompetitionsService', ['$q', function($q) {
    var getCompetititons = function() {

       // Insert appropriate http requests for competitions here
       return $q(function (resolve) {
         return resolve([{
           id: 1,
           competition: 'DUMMY-1'
         }, {
           id: 2,
           competition: 'DUMMY-2'
         }])
       }).then(function (competitions) {
         var promises = competitions.map(function (competition) {

           // Insert suitable http requests for teams here
           return $q(function (resolve) {
             var teamBaseName = competition.id;
             competition.teams = [teamBaseName + '1', teamBaseName + '2'];
             return resolve(competition)
           });
         });

         return $q.all(promises);
       });
    };

    return {
      getCompetititons: getCompetititons
    };
}]);

Please note that in the given code snippet, I have used placeholder data instead of actual http requests for demonstration purposes.

Answer 6

In order to tackle your issue effectively, my suggestion would be to initiate an initial request for the competitions, then consolidate all subsequent requests and resolve them using $q.all. Refer to this jsbin example for further clarity: http://jsbin.com/sugonifayi/1/edit?html,js,console

var app = angular.module("AngularApp", ['test']);

angular.module('test', [])
  .controller('TestController', ['$scope', 'CompetitionsService', function ($scope, CompetitionsService) {
    $scope.competitions = [];

    CompetitionsService.getCompetititons().then(function (response) {
      $scope.competitions = response;
      console.log($scope.competitions);
    });
  }])
.service('CompetitionsService', ['$q', function($q) {
    var getCompetititons = function() {

       // Insert appropriate http requests for competitions here
       return $q(function (resolve) {
         return resolve([{
           id: 1,
           competition: 'DUMMY-1'
         }, {
           id: 2,
           competition: 'DUMMY-2'
         }])
       }).then(function (competitions) {
         var promises = competitions.map(function (competition) {

           // Insert suitable http requests for teams here
           return $q(function (resolve) {
             var teamBaseName = competition.id;
             competition.teams = [teamBaseName + '1', teamBaseName + '2'];
             return resolve(competition)
           });
         });

         return $q.all(promises);
       });
    };

    return {
      getCompetititons: getCompetititons
    };
}]);

Please note that in the given code snippet, I have used placeholder data instead of actual http requests for demonstration purposes.

Incorrect scope value detected in Angular controller

Answer №1

Answer №2

Answer №3

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