When configuring an app with UI Router, utilize the $http service

I am working on a project using Angular UI Router and Coach Potato. I want the UI Router states to load from the server side and then be added to the state provider in the Angular app.config. However, I am encountering an issue where I cannot inject the $http service into the app.config function. My code looks like this:

var app = angular.module('app', ['ui.router.compat']);
app.config(['$stateProvider', '$routeProvider', '$urlRouterProvider', '$http',
  function ($stateProvider, $routeProvider, $urlRouterProvider, $http) {

      $urlRouterProvider
        .when('/c?id', '/contacts/:id')
        .otherwise('/');

      $routeProvider
        .when('/user/:id', {
            redirectTo: '/contacts/:id'
        });

      var get = $http.get('/api/Values/');

      get.success(function (data) {
            list = data.result;
        });

      var populateStates = function () {

          angular.forEach(list, function(item) {
              $stateProvider.state(item);

              angular.forEach(item.subMenus, function(sub) {
                  $stateProvider.state(sub);
              });
          });
      };

      populateStates();
  }]);

How can I fetch data (states) from the server in app.config?

Answer №1

Here's the main point:

  • It's impossible to inject a service into the provider configuration section.
  • However, you can inject a service into the section that initializes the provider's service.

Further Explanation:

Angular framework follows a two-phase initialization process:

PHASE 1: Configuration

During the config phase, all providers are initialized, and all config sections are executed. These sections may have code that configures provider objects, making them injectable with provider objects. Since providers are factories for service objects, and they are not fully initialized/configured at this stage, services cannot be used/injected during configuration. Providers become ready after this phase, and no further configuration is possible.

PHASE 2: Runtime

During the run phase, all run sections are executed. Providers are ready at this stage and can create services, so services can be used/injected during runtime.

Examples:

1. Trying to inject the $http service into the provider initialization function will result in an error.

angular.module('myModule').provider('myProvider', function($http) {
    // code to initialize/configure the PROVIDER here (during `config` phase)
    ...

    this.$get = function() {
        // code to initialize/configure the SERVICE here (during `run` phase)

        return myService;
    };
});

Injecting the $http service into a function executed during the config phase will trigger an error because the $httpProvider creating the service is not ready yet.

2. Injecting the $http service into the service initialization function will work:

angular.module('myModule').provider('myProvider', function() {
    // code to initialize/configure the PROVIDER here (during `config` phase)
    ...

    this.$get = function($http) {
        // code to initialize/configure the SERVICE here (during `run` phase)

        return myService;
    };
});

Injecting the service into the service initialization function, executed during the run phase, will work without issues.

Source: Original Post

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