What is the ideal placement for the signOut logic in AngularJS?

Within all of my controllers, I currently have the following code that is executed when a link is clicked in the view:

  $scope.logout = function() {
    authenticationService.logout();
    $scope.isAuthUser = false;
    delete $localStorage.selectedModel;
    $location.path('/login').search('key', null);
  };

As a newcomer to angularJS, I am curious about the best approach:

  • Should I place this logic in a service?

Or

  • Is it better to utilize a directive?

When using a directive, I understand how to use controllers like $scope.isAuth = false;, but with a service, I am unsure how to implement it without repeating the code in every controller as shown below:

  $scope.logout = function() {
    authenticationService.logout();
    myNewService.logout();
    $scope.isAuthUser = false;
  };

In the view:

    <a href="javascript:void(0)" data-ng-click="logout()">              
      <span>Sign Out</span>
    </a>

I am concerned that this approach may not be optimal. What is the recommended way to handle this situation?

javascriptangularjs

Answer №1

The use of directives has no impact on this logic, that is certain. With the existing authenticationService, it is fitting to house the business logic for login/logout functions within this service. Moving this code out of the controller and into the service would be advisable.

Once integrated into the service, the controller would only need this line of code:

$scope.logout = authenticationService.logout;

That's all. Controllers should strive to be as concise as possible without including business logic, though view logic is acceptable.

As for $scope.isAuthUser, doesn't it seem more fitting for "isAuthUser" to be a property of the authenticationService service? After all, authenticationService serves as an object intended to maintain methods and properties related to the model/datalayer. Consequently, this should also be transferred to the same service.

If you require the flag for template usage (such as displaying or hiding buttons), you could expose this service collectively as a $scope/$rootScope property. For example, in a top-level controller, you could do something like:

app.controller('mainController', ['$scope', 'authenticationService', function($scope, authenticationService) {
    $scope.auth = authenticationService;
}]);

Subsequently, in any template, you could effortlessly utilize:

<a href="#/logout" ng-click="logout()" ng-show="auth.isAuthUser">Logout</a>

Answer №2

I have a special method for tackling this.

  • When handling logic without any Ajax/API calls, I opt for a service.
  • If API calls are involved, then I lean towards using a Factory.
  • For tasks involving templates or DOM manipulation, I turn to Directives.

In your specific scenario, using a service would be most suitable. You can implement your logout functionality within the service and call it as needed.

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