Angular page fails to refresh upon addition or deletion of data

There's a recurring issue with my angular application where the page fails to refresh after data manipulation such as addition, editing, or removal. For example, when I add a new item to a list of subjects, it doesn't show up unless I navigate away from the page and return to it. I attempted to solve this by using route.reload and resetting the scope of the subjects list below. However, an alert I placed for debugging purposes fires before the page redirects back to the list of subjects even though $location.path('/subjects') is defined two lines earlier. Here's an excerpt from my controller:

angular.module('myApp.controllers')
    .controller('SubjectEditCtrl', ['$scope', '$routeParams', 'SubjectFactory', 'SubjectsFactory', '$location', '$route',
    function ($scope, $routeParams, SubjectFactory, SubjectsFactory, $location, $route) {

    // On clicking 'updateSubject':
    $scope.updateSubject = function () {
        // Update on the server
        SubjectFactory.update($scope.subject);
        // Redirect to the list of all subjects
        $location.path('/subjects/');
        // Reset the subject list scope
        $scope.subjects = SubjectsFactory.query();
        // Reload the page
        $route.reload();
        // The alert displays before the redirect
        alert('route reload happening');
    };


    SubjectFactory.show({id: $routeParams.subjectId}).$promise.then(function(subject) {
        $scope.subject = subject;
    }, function(err) {
        console.error(err);
    });


}]);

Is there any suggestion for resolving this issue?

EDIT: Subjects Service

var app = angular.module('myApp.services');

app.factory('SubjectsFactory', function ($resource) {
    return $resource('https://myapiurl.com/subjects', {}, {
        query: { method: 'GET', isArray: true },
        create: { method: 'POST' }
    })
});

app.factory('SubjectFactory', function ($resource) {
    return $resource('https://myapiurl.com/subjects/:id', {}, {
        show: { method: 'GET', isArray: false },
        update: { method: 'PATCH', params: {id: '@id'} },
        delete: { method: 'DELETE', params: {id: '@id'} }
    })
});

Answer №1

There are instances where you may need to make changes to the scope in your code. This can be achieved using the following snippet:

$scope.$apply();

However, it is important to note that this should only be done when the application is not in the "$digest" phase, as attempting to do so during this phase will result in an exception being thrown. It is crucial to first check if the application is not in the "$digest" phase before applying any changes. Below is an example of a safe method I use to apply changes:

safeApply: function (scope, callback) {
   if (scope.$$phase != '$apply' && scope.$$phase != '$digest' &&
        (!scope.$root || (scope.$root.$$phase != '$apply' && scope.$root.$$phase != '$digest'))) {
        scope.$apply();
    }
    if (angular.isFunction(callback)) {
        callback();
    }
}

Answer №2

If you're looking for a solution, here's one possible approach:

Instead of trying to retrieve data from the database directly, consider adding the new object and then simply pushing it into the $scope.items array.

For instance:

 $scope.add = function (newItem) {
        DataService.addItem(newItem).then(function(){
           $scope.items.push(newItem);
           //or for removing
           //$scope.items.splice($scope.items.indexOf(newItem), 1);
        });
    };

Make sure to update your factory as well:

   addItem: function (newProject) {
        $http.post('Api/Controller/Post').then(function(successResult){ 
             ...
        }, function (errorResult) {
            ...
        });
    }

The item will only be added to $scope.items after a successful call to the server-side method.

Answer №3

After making some adjustments to the request structure, the issue was resolved. The updated code looks like this:

$scope.updateSubject = function () {
                SubjectFactory.update($scope.subject).$promise.then(function (subject) {
                    $scope.subject = subject;
                    $location.path('/subjects/');
                    $route.reload();
                }, function (err) {
                    console.error(err);
                });
            };

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