Struggling to maintain data consistency among controllers in Angular by utilizing the rootScope, only to encounter persistent issues with

I am facing an issue with displaying the admin status at the top of all pages for a user who successfully logs in as an admin. Here is my code snippet:

<!-- nav bar -->
<div>
    <span ng-show="$root.isAdmin">(ADMIN)</span>
</div>

Although I set $rootScope.isAdmin = true; in one controller, when accessing it in another controller, it returns undefined. I have researched similar topics but found no solution that applies to my case.

One suggested solution is to use a service to hold shared data instead of relying on $rootScope. However, this would require injecting the service into each controller where the admin status needs to be displayed:

app.controller('...', ['$scope', 'checkAdminService', function($scope, checkAdminService) {
    $scope.isAdmin = checkAdminService.getIsAdmin()
}]);

Then the HTML code would look like this:

<span ng-show="isAdmin">(ADMIN)</span>

Is this approach acceptable or more cumbersome? And why does the $rootScope solution fail to work as expected in my scenario?

Answer №1

Avoiding the use of $rootScope is a wise decision. Instead, consider creating a service to store information that needs to be shared across different controllers. This approach allows you to call the service in multiple locations without any issues.

One suggestion is to create a separate controller for the top section of your page that specifically checks if the user is an admin. The remaining parts of the page can then be managed by other controllers.

This demonstration showcases the utilization of multiple controllers, although achieving the same outcome with Routers is also possible.

Answer №2

Have you considered using a custom Angular value instead of passing around the $rootScope? This way, you can register it at startup and easily share it as needed.

Check out this example on Plunker

angular
    .module('app')
    .value('userProfile', userProfile);

function userProfile() {
  var userProfile = {
    isAdmin: false
  };
  return userProfile;
}

/////////////////

angular
    .module('app')
    .run(run);

run.$inject = ['userProfile', 'userAuthService'];
function run(userProfile, userAuthService) {
  userAuthService.isUserAdmin().then(function(result) { userProfile.isAdmin = result; });
}   

Answer №3

angular.module('examplemodule', []) 
  .run(['$scope', function($scope) {
    $scope.isUserAdmin = true;
])

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