The concept of undefined functions and the use of dependency injection may not always align

Recently starting with AngularJs, I am honing my skills by developing a single page Todo Application. However, I have encountered an issue while trying to load a localStorage factory that I intend to use for this project. Currently, I am stuck on the error message:

'Undefined is not a function at routeconfig.resolve.store on app.js line 11.'

Below is the code snippet in question :

app.js


angular.module('TodoAngular', ['ngRoute'])
    .config(function($routeProvider) {
    'use strict';

    var routeConfig = {
        controller: 'TodoController' ,
        templareUrl: 'app/partials/TodoList.html',
        resolve: {
          store: function (todoAngularStorage) {
              return todoAngularStorage.then(function (module) {
                  module.get(); 
                  return module;
              });
          }
        }
    };

    $routeProvider
        .when('/todos', routeConfig)
        .otherwise({ 
            redirectTo: '/todos' 
        });
    }     
);

todoAngularStorage.js


angular.module('TodoAngular')
    .factory('todoAngularStorage', function ($http,$injector) {
        'use strict';

       return $injector.get('localStorage');
    })

    .factory('localStorage', function($q) {
        'use strict';

        var STORAGE_ID = 'todoAngularLocalStorage';

        var store = {
            todos: [],

            _getFromLocalStorage: function(){
                return JSON.parse(localStorage.getItem(STORAGE_ID) || '[]');
            },

            _saveToLocalStorage: function (todos) {
                localstorage.setItem(STORAGE_ID, JSON.stringify(todos));
            },

            delete: function (todo) {
                var deferred = $q.defer();

                store.todos.splice(store.todos.indexOf(todo), 1);

                store._saveToLocalStorage(store.todos);
                deferred.resolve(store.todos);

                return deferred.promise;
            },

            get: function () {
                var deferred = $q.defer();

                angular.copy(store._getFromLocalStorage(), store.todos);
                deferred.resolve(store.todos);

                return deferred.promise;

            },

            insert: function (todo) {
                var deferred = $q.defer();

                store.todos.push(todo);

                store._saveToLocalStorage(store.todos);
                deferred.resolve(store.todos);

                return deferred.promise;

            }
      };

      return store;
});

Upon debugging, it seems that the issue lies within the 'module' passed in the function called in the above mentioned section of my app.js file

return todoAngularStorage.then(function (module) {

I have been referencing this example (https://github.com/tastejs/todomvc/tree/master/examples/angularjs) for guidance while building my application and currently struggling to pinpoint where exactly I went wrong.

Answer №1

It appears that the object returned by your localStorage service factory does not contain a property named then. Subsequently, when you return this object from the todoAngularStorage factory and attempt to use the then property as a function, an error is generated. To resolve this issue, consider revising your code as follows:

return todoAngularStorage.get().then(function () {
    return todoAngularStorage;
});

Additionally, for future reference, you can utilize debugging techniques such as setting breakpoints and examining variable values to identify the source of errors in your code.

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