Place the `service` parameter into the `run` function

Question

Place the `service` parameter into the `run` function

What are some examples of when to utilize the angular.run method? I have a service that is resource-intensive and takes a significant amount of time to initialize before it can be used in conjunction with my view.

angular.module('myApp').service('heavyService',function($timeout){ 
       this.someAjaxCall=function(){

       } 
});

angular.module('myApp').run(function(heavyService){
      // How can I incorporate my heavyService here and then later use it throughout the application
});

How can you inject a service within the run method and subsequently utilize it within the application?

javascript angularjs

Answer 1

Answer №1

Sequence of Execution:

app.config()
app.run()
compile functions of directives (if present in the DOM)
app.controller()
link functions of directives (if found again)

Run blocks - These blocks are executed after the injector is created and are utilized to initialize the application. Only instances and constants can be injected into run blocks, preventing further system configuration during runtime.

source

angular.module('myApp').run(['heavyService', function(heavyService) {

}]);

Answer 2

Sequence of Execution:

app.config()
app.run()
compile functions of directives (if present in the DOM)
app.controller()
link functions of directives (if found again)

Run blocks - These blocks are executed after the injector is created and are utilized to initialize the application. Only instances and constants can be injected into run blocks, preventing further system configuration during runtime.

source

angular.module('myApp').run(['heavyService', function(heavyService) {

}]);

Answer 3

Answer №2

Have you considered implementing something like the example below? (Referencing John Papa's style guide "Route Resolve Promises"):

// route-config.js
angular
    .module('app')
    .config(config);

function config($routeProvider) {
    $routeProvider
        .when('/avengers', {
            templateUrl: 'avengers.html',
            controller: 'Avengers',
            controllerAs: 'vm',
            resolve: {
                moviesPrepService: moviesPrepService
            }
        });
}

function moviesPrepService(movieService) {
    return movieService.getMovies();
}

// avengers.js
angular
    .module('app')
    .controller('Avengers', Avengers);

Avengers.$inject = ['moviesPrepService'];
function Avengers(moviesPrepService) {
      var vm = this;
      vm.movies = moviesPrepService.movies;
}

In essence, this approach prepares the service and fetches all the necessary data via AJAX before resolving the route. Once that process is completed, access to the static data in the controller is then available.

Answer 4

Have you considered implementing something like the example below? (Referencing John Papa's style guide "Route Resolve Promises"):

// route-config.js
angular
    .module('app')
    .config(config);

function config($routeProvider) {
    $routeProvider
        .when('/avengers', {
            templateUrl: 'avengers.html',
            controller: 'Avengers',
            controllerAs: 'vm',
            resolve: {
                moviesPrepService: moviesPrepService
            }
        });
}

function moviesPrepService(movieService) {
    return movieService.getMovies();
}

// avengers.js
angular
    .module('app')
    .controller('Avengers', Avengers);

Avengers.$inject = ['moviesPrepService'];
function Avengers(moviesPrepService) {
      var vm = this;
      vm.movies = moviesPrepService.movies;
}

In essence, this approach prepares the service and fetches all the necessary data via AJAX before resolving the route. Once that process is completed, access to the static data in the controller is then available.

Answer 5

Answer №3

The run block in AngularJS is essential for initializing values that need to be accessible throughout the application. By injecting services into the run block, you can initialize service variables that will remain consistent across all components as services are singleton objects.

Sample Code:

// Initialization block
angular.module('myApp').run(function(heavyService){
     // Access service variables and methods here
     // Set value of a variable before it is requested by any controller
     heavyService.someVariable = 'Initial Value'; 
});

In the config phase, you can also set initial values for variables or perform configuration settings. However, the config block does not have access to services directly; they only interact with providers and do not have access to $rootScope during this phase.

The benefit of setting values within the run block is that it has access to $rootScope and can handle route-related events like $locationchangestart, $locationchangesuccess, $routechangestart, etc.

Answer 6

The run block in AngularJS is essential for initializing values that need to be accessible throughout the application. By injecting services into the run block, you can initialize service variables that will remain consistent across all components as services are singleton objects.

Sample Code:

// Initialization block
angular.module('myApp').run(function(heavyService){
     // Access service variables and methods here
     // Set value of a variable before it is requested by any controller
     heavyService.someVariable = 'Initial Value'; 
});

In the config phase, you can also set initial values for variables or perform configuration settings. However, the config block does not have access to services directly; they only interact with providers and do not have access to $rootScope during this phase.

The benefit of setting values within the run block is that it has access to $rootScope and can handle route-related events like $locationchangestart, $locationchangesuccess, $routechangestart, etc.

Place the `service` parameter into the `run` function

Answer №1

Answer №2

Answer №3

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