Angular controller fails to fetch scope variable in subsequent view

I'm currently working on implementing a login feature that directs a validated user to a personalized HTML view that greets them with their name.

The initial view is a login page. When the user clicks the "Log In" button, the ng-click function is supposed to trigger my controller's $scope.login, which validates the user, sets the $scope.needsLoggingIn variable, and redirects to the second view (a welcome page displaying the value of $scope.needsLoggingIn).

The issue I'm facing is that the second view (utilizing the same Angular Controller and Module) does not display the $scope.needsLoggingIn variable when I attempt to set it within the $scope.login function. It only shows the variable when I manually set the value in the controller, outside of any scope function, like this:

$scope.needsLoggingIn = "Betty";

Here is the $scope.login function in my controller, which attempts to set the $scope.needsLoggingIn and is recognized in the first view but not in the second:

$scope.login = function (username, password) {
    $http({
        method: 'GET',
        url: ('/login/' + username + '/' + password)
    }).then(function successCallback(response) {
        if (JSON.stringify(response.data) === '[]')
        {
            $scope.needsPasswordMessage = true;
            if ($scope.needsPasswordMessage)
                $scope.needsPasswordMessage = false;
            console.log("No match");
        } else {
            $scope.needsLoggingIn = username;
            $scope.issuccessMessage = true;
            if ($scope.isfailureMessage)
                $scope.isfailureMessage = false;
            $window.location.href = '../indextest.html';
            return response;
        }
    }, function errorCallback(response) {
    });
};

Any suggestions on how I can ensure that my $scope.needsLoggingIn is recognized by both HTML views without hard-coding it into the controller? I would prefer for my $scope.login function to set the variable value and be recognized by all views using this specific controller.

Answer №1

To ensure data remains consistent across various views and controller instances, it is recommended to use a service for handling it.

One way to implement this is by creating a service like:

function userDataService($http) { 
    let service = {}
    service.loggedInUser = ""
    service.login = loginUser

    return service

    function loginUser() {
       return $http.... (your login code)
    }
}

Next, inject this service into your controller, configure the properties accordingly, and due to the singleton nature of the service, the property values will persist and be accessible throughout the application wherever the service is injected.

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