Postpone the execution of the page controller until all necessary initial data has been collected

My Single Page Application (SPA) is in need of some initial data fetched from the server, such as user login status and permissions. However, I want to defer loading the page until this vital information is retrieved to avoid any issues with incomplete data. While using a promise may seem like a solution, it doesn't address my concern about the page starting to load prematurely or the hassle of constantly relying on promises for basic data retrieval.

Here's what I have attempted so far:

Service Code:

app.factory('AppData', function($q, $http){

    var appData = {};

    $http
        .post( "/api/GeneralActions/getInitData", {
        }).success(function (data, status, headers, config) {
            appData = data;
        }).error(function (data, status, headers, config) {
        });

    return {
        getAppData: function () {
            return appData;
        }
    };
});

Page Controller Code:

app.controller('MainPreferences', function($scope, AppData){

    // At this point, appData is null
    $scope.appData = AppData.getAppData();

});

Answer №1

Below is a suggested code snippet:

app.factory('AppData', function($q, $http){

    var appData = {};

    $http
        .post( "/api/GeneralActions/getInitData", {
        }).success(function (data, status, headers, config) {
            //appData = data;
            angular.extend(appData, data);
        }).error(function (data, status, headers, config) {
        });

    return {
        getAppData: function () {
            return appData;
        }
    };
});

Rather than creating the appData object again, it is recommended to extend it with the new data. This way, the appData object pointer will remain unchanged and controllers will receive the updated data.

Answer №2

Do you have ngRoute implemented? If yes, it seems like you are looking to establish a resolve property on your routes in order to ensure that something is loaded before transitioning to the new route.

For more information, refer to the ngRoute documentation and look into the use of resolve.

Answer №3

When utilizing the default Angular ngRoute routing system, you have the option to utilize the resolve property within the route definition. This allows you to define a set of functions that return promises. The route controller will wait until all these promises are resolved before initializing, and their results will be injected into the controller.

Here is an example:

$routeProvider.when('/example', {
  controller: 'exampleCtrl',
  resolve: {
    data: function($http) { return $http.get('/fetch/data'); }
  }
});

// 'data' from the resolve is injected into the controller
myApp.controller('exampleCtrl', function($scope, data) {
  $scope.data = data;
});

Answer №4

My suggestion for improvement would be as follows:

app.factory('AppData', function($q, $http){

    var appData = {};

    return {
        getAppData: function () {
            $http.post( "/api/GeneralActions/getInitData", {}).success(function (data, status, headers, config) {
                    return data;
            }).error(function (data, status, headers, config) {

            });
        }
    };     
});

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