In certain cases, the AngularJS $rootScope may not be properly updating in the resolve function

Strangely, the $rootScope.user variable in my resolve function is not fully assigned with data before the view.html template loads.

Most of the time, when I use {{ $root.user.uid }} in my template, I can see the variable data, but occasionally it does not display.

I'm puzzled as to why this issue is occurring because shouldn't a resolve function run BEFORE the template loads?

Does anyone have any insights into why this might be happening?

NOTE: When I include a console.log($rootScope.user.uid) before deferred.resolve();, it always shows up in the console, yet the variable doesn't appear in the template.

.factory('Auth', function($http, $state, $q, $rootScope) {
    var factory = {workflowItemCheck: workflowItemCheck };
    return factory;

   function workflowItemCheck(workflow_id) { return $http.post('/auth/workflow', {workflow_id:workflow_id}); }
})


.config(function($stateProvider, $urlRouterProvider, $locationProvider) {
    var workflow_item_auth = ['$q', 'Auth', '$rootScope', '$stateParams', function ($q, Auth, $rootScope, $stateParams) { 

        var deferred = $q.defer();

        Auth.workflowItemCheck($stateParams.workflow_id).then(function(data){ 
            $rootScope.user = { uid: data.data.uid };
            deferred.resolve(); 
        }, function(){ deferred.reject(); });

        return deferred.promise;
    }];


    $stateProvider.state(
        'workflow2.view', { 
            url: '/:workflow_id/view', 
            templateUrl: 'pages/templates/workflow/view.html',
        }, 
        controller: 'workflow.view', 
        resolve: { authenticated: workflow_item_auth } 
    })



})

PLEASE NOTE: There is nothing in the controller. This is specifically getting my $rotoScope to the template.

Answer №1

It seems that your resolve function is not returning a promise, which could lead to issues with the timing of when workflow_item_auth is set. If you return a promise in your resolve, it will wait until it is resolved before navigating to your view.

$stateProvider.state(
        'v1', {
            url: '/:workflow_id/view',
            templateUrl: 'view.html',
            resolve: {
                authenticated: function(Auth, $rootScope, $stateParams) {
                    return Auth.workflowItemCheck($stateParams.workflow_id).then(function(data) {
                        $rootScope.user = {uid: data.data.uid};
                        return data;
                    });
                }
            }
        }
);

UPDATE - Upon further review, it appears that you are indeed returning a promise in your resolve function. However, I still believe there may be a timing issue present. My recommendation would be to follow the approach I outlined earlier for best results.

Answer №2

Due to the asynchronous nature of the backend call, Angular may have already completed its digest cycle before the call to the backend is finished. As a result, the binding remains unchanged.

To resolve this issue, consider adding $rootScope.$apply() immediately after setting $rootScope.user in your promise's resolve function. This will help refresh the bindings and ensure that they are updated accordingly.

Answer №3

I have found a solution that involves ensuring the resolve function executes before data is loaded into the view. Resolves are processed before controllers if they return a promise, and controllers are run before the view is displayed.

Hopefully, this information can provide some assistance.

.controller('workflow.view', ['$rootScope', 'authUser', function($rootScope, authUser){
$rootScope.user = { uid: authUser.data.uid };}])

.config(function($stateProvider, $urlRouterProvider, $locationProvider) {
$stateProvider.state(
    'workflow2.view', { 
        url: '/:workflow_id/view', 
        templateUrl: 'pages/templates/workflow/view.html',
    }, 
    controller: 'workflow.view', 
    resolve: { 
        Auth : 'Auth',
        authUser: function(Auth,$stateParams){
           return Auth.workflowItemCheck($stateParams.workflow_id);
        }
    } 
})})

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