Factory not properly updating AngularJS controller

I am facing an issue with two controllers and one factory in my AngularJS application. The first controller sends an http request to a server, receives a string in response, and stores it in the factory. However, the second controller does not update with this new string as expected.

Here is the relevant code snippet:

...
.factory('user', function() {
    return {
        name: {str: ''},
        passwordHashed: {str: ''},
        userType: {str: 'none'},
    };
})
.controller('nav', ['$scope', 'user', function($scope, user) {
    $scope.allSites = [
        //example of a page structure
        {name: 'home', title: 'Home', allowed: ['none', 'admin']},
    ];
    $scope.allowedSites = []; //displayed in navigation
    angular.forEach($scope.allSites, function(site) {
        if(contains(site.allowed, user.userType.str) != -1) $scope.allowedSites.push(site);
    });
}])
.controller('loginCTRL', ['$scope', '$http', 'user', function($scope, $http, user) {
    $http.get('url').success(function(data) {

        //some code

        user.name.str = $scope.enteredUsername;
        user.passwordHashed.str = $scope.passwordHashed;
        user.userType.str = data; //admin
    });
});

The intended functionality is to update the navigation whenever the userType changes. However, after a login, the navigation does not refresh. I have tried different approaches, including structuring strings into separate objects, but the issue persists. Any insights or suggestions would be greatly appreciated.

Answer №1

If breakpoints are added to the code of this service (not factory, by the way) and these controllers, it becomes apparent that the initialization of controllers occurs prematurely, resulting in an incorrect state for the service.

This issue arises due to the dependency injection mechanism.

Your controller establishes its state only once. To update its state, you must include the relevant code within a refresh() function and execute it when your service is ready.

There are multiple methods to achieve this, one example can be viewed here: http://www.codeproject.com/Tips/773147/Communication-between-the-Controllers-in-AngularJS

Answer №2

After reviewing your code, here are some suggestions on how it can be improved:

  1. Instead of just using $routeProvider, consider adding a custom attribute called "acl" and assigning it a numeric value for better organization.
  2. Utilize the following code snippet in your application:

    app.run(function ($rootScope, $location) {
    
    $rootScope.$on('$routeChangeStart', function (event, nextRoute, currRoute) {
    

    This will help you create a redirect interceptor.

  3. For comparing numeric values of ACL attributes, use: if (user.acl < route.acl)

Keep it clean and straightforward :)

By the way, consider using $watch in your controller to monitor changes in the factory and respond accordingly.

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