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

Similar questions

Is it possible to reset only certain data values in Vue without re-initializing the entire set?

Creating dynamic templates for table rows in AngularJS directives

Transferring information and storing it in a textbox

PHP is unable to extract an email address from the $http post method in Angular

Tips for ensuring an HTML element remains within defined boundaries

Guide on updating the form structure with ajax

Could we confirm if this straightforward string is considered valid JSON data?

What are the steps for including and excluding components in Parallax JS?

Personalizing the text of an item in a v-select interface

Change the background color of a particular row in a table using Vue.js to be red

Resolver for nested TypeORM Apollo queries

Looping through a series of JavaScript objects in a JSON

Transferring information from child to parent class in TypeScript

Issue with Material UI dropdown not selecting value on Enter key press

What is the best way to define a variable in EJS?

Try utilizing MutationObserver to monitor changes in various nodes

When testing on jsfiddle, the script functions properly with pure JavaScript. However, when integrating it into my own code, it fails to work unless jQuery is included

Using Javascript function with ASP.NET MVC ActionLink

Reduce the length of the text to 50 characters after the current word, while ensuring that the word

Storing user information in Angular after login and implementing JWT authentication