An error of undefined Angular Service/Factory has occurred

Question

An error of undefined Angular Service/Factory has occurred

I created a factory service called siteCollection:

spApp.factory('siteCollection', function(){
  return {
    usersObject : [],
    getUsers : function (){
      $().SPServices({
        operation: "GetUserCollectionFromSite",
        completefunc: function(xData, Status) {
          var responseXML = $(xData.responseXML);
          responseXML.find("User").each(function() {
            usersObject.push({
              id: $(this).attr("ID"),
              name: $(this).attr("Name"),
              domainAccount: $(this).attr("LoginName")
            });
          });
        }
      });
      return usersObject;
    }
  }
})

The intention is to return the usersObject that I defined at the beginning, but I'm encountering an undefined error in the console for the object.

Below is the controller code:

spApp.controller('userCtrl', 
    function userCtrl($scope,siteCollection){
        $scope.users = siteCollection.getUsers();
    }
);

I am still learning Angular and navigating through the challenges.

javascript angularjs angular-services

Answer 1

Answer №1

There are a couple of issues to address in your code:

The first problem: within your factory, you are returning an object with the properties usersObject and getUsers. However, in the getUsers function, you are trying to access a variable named "usersObject", which is not a property of the returned object. To fix this, declare the variable outside as shown below:

var usersObject = [];
return {
  getUsers: function () {
    // ...
    return usersObject;
  }
};

The second issue: you are populating your usersObject within a callback function that is executed asynchronously. AngularJS does not automatically detect these changes in your array. To ensure the views are updated after the data has been added to the array, consider using $rootScope.$apply() as demonstrated below:

spApp.factory('siteCollection', function ($rootScope) {
  // ...
  $rootScope.$apply(function () {
    responseXML.find("User").each( function () { ... } );
  });
}

Although using $rootScope.$apply() works, a cleaner approach would be to utilize promises. Rewrite your code with promises like this:

spApp.factory('siteCollection', function ($q) {
  return {
    getUsers : function (){
      var deferred = $q.defer();

      $().SPServices({
        operation: "GetUserCollectionFromSite",
        completefunc: function(xData, Status) {
          var responseXML = $(xData.responseXML),
              usersObject = [];

          responseXML.find("User").each(function() {
            usersObject.push({
              id: $(this).attr("ID"),
              name: $(this).attr("Name"),
              domainAccount: $(this).attr("LoginName")
            });
          });

          deferred.resolve(usersObject);
        }
      });

      return deferred;
    }
  }
});

If you adopt the promise-based approach, remember to include the following in your controllers to handle the loaded data appropriately:

siteCollection.getUsers.then(function (users) {
  // Handle the data here
});

Answer 2

There are a couple of issues to address in your code:

The first problem: within your factory, you are returning an object with the properties usersObject and getUsers. However, in the getUsers function, you are trying to access a variable named "usersObject", which is not a property of the returned object. To fix this, declare the variable outside as shown below:

var usersObject = [];
return {
  getUsers: function () {
    // ...
    return usersObject;
  }
};

The second issue: you are populating your usersObject within a callback function that is executed asynchronously. AngularJS does not automatically detect these changes in your array. To ensure the views are updated after the data has been added to the array, consider using $rootScope.$apply() as demonstrated below:

spApp.factory('siteCollection', function ($rootScope) {
  // ...
  $rootScope.$apply(function () {
    responseXML.find("User").each( function () { ... } );
  });
}

Although using $rootScope.$apply() works, a cleaner approach would be to utilize promises. Rewrite your code with promises like this:

spApp.factory('siteCollection', function ($q) {
  return {
    getUsers : function (){
      var deferred = $q.defer();

      $().SPServices({
        operation: "GetUserCollectionFromSite",
        completefunc: function(xData, Status) {
          var responseXML = $(xData.responseXML),
              usersObject = [];

          responseXML.find("User").each(function() {
            usersObject.push({
              id: $(this).attr("ID"),
              name: $(this).attr("Name"),
              domainAccount: $(this).attr("LoginName")
            });
          });

          deferred.resolve(usersObject);
        }
      });

      return deferred;
    }
  }
});

If you adopt the promise-based approach, remember to include the following in your controllers to handle the loaded data appropriately:

siteCollection.getUsers.then(function (users) {
  // Handle the data here
});

Answer 3

Answer №2

Here is the suggested format:

app.factory('friendsList', function(){
  var contactsArray = [];
  return {
    getContacts : function (){...

The returned object consists of methods to interact with the data, however they lack cohesion in terms of their scope. By defining only the `contactsArray` within the return object, it becomes inaccessible within `getContacts`.

Answer 4

Here is the suggested format:

app.factory('friendsList', function(){
  var contactsArray = [];
  return {
    getContacts : function (){...

The returned object consists of methods to interact with the data, however they lack cohesion in terms of their scope. By defining only the `contactsArray` within the return object, it becomes inaccessible within `getContacts`.

An error of undefined Angular Service/Factory has occurred

Answer №1

Answer №2

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