Angular Services

Angular Services

Paweł Pierzchała @zwrozka

Controller definition

angular.module('workshops.timeline')
       .controller('TimelineController', ['$scope', controller]);

Dependency Injection

var controller = function($scope, $timeout, timelineService) { }

Dependencies types

• constants
• values
• factories
• services
• providers

Values & constants

provide.value('a', 123);

function Controller(a) {
  expect(a).toEqual(123);
}

Factories

provide.factory('b', function(a) {
  return a*2;
});

function Controller(b) {
  expect(b).toEqual(246);
}

Objects

function Greeter(a) {
  this.greet = function() {
    return 'Hello ' + a;
  }
}

provide.factory('greeter', function(a) {
  return new Greeter(a);
});

function Controller(greeter) {
  expect(greeter.greet()).toEqual('Hello 123');
}

Services

provide.factory('greeter', function(a) {
  return new Greeter(a);
});

provider.service('greeter', Greeter);

Providers

provide.provider('greeter2', function() {
  var salutation = 'Hello';
  this.setSalutation = function(s) {
    salutation = s;
  }

  function Greeter(a) {
    this.greet = function() {
      return salutation + ' ' + a;
    }
  }

  this.$get = function(a) {
    return new Greeter(a);
  };
});

Providers

angular.module('abc', []).configure(function(greeter2Provider) {
  greeter2Provider.setSalutation('Halo');
});

function Controller(greeter2) {
  expect(greeter.greet()).toEqual('Halo 123');
}

$provider

$injector

$injector.invoke(function(greeter) {
  greeter.greet();
})

greeter = $injector.get('greeter');

Dependency annotation

provider.service('greeter', ['$scope', Greeter]);

Greeter.$inject = ['$scope'];
provider.service('greeter', Greeter);

Controllers, Directives & Filters

$controller, $directive, $filter

Angular module

angular.module('workshops.timeline')

Angular dependencies

angular.module('workshops.timeline',
  ['ng', 'Restangular', 'workshop.directives.form'])

Modularization practices

• vertically not horizontally
• at least one module per page
• one module per directive

Testing

describe("A suite", function() {
  it("contains spec with an expectation", function() {
    expect(true).toBe(true);
  });
});

describe('messages creation', function() {
  it('posts new messages to the backend', inject(function($httpBackend) {
  }));
});

describe('timelineService', function() {
  beforeEach(module('workshops.timeline'))
});

beforeEach(inject(function($httpBackend) {
  $httpBackend.whenGET('/api/users')
              .respond(200, [{id: 1, login: 'alice'}]);
}));

it('posts new messages to the backend', inject(function($controller) {
  var scope = {};
  $controller('TimelineController', {'scope': scope});

  expect(scope.users).toEqual([]);
}));

npm install -g karma

var users = Restangular.all('/api/users').getList();

Create a timelineService

Test it!

Test integration beetwen the controller and the service

Routing

GET '/api/wall_items'
POST '/api/wall_items'

GET '/api/users'