Design Pattern for angular 4 applications

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  • Updated at: 2019-12-05 17:15:49

Angular 4 Design Pattern

A4 is a design pattern for large scale angular 4 applications that is easy to use and implement.

Code Seperation

A4 categorize app basics like (services, directives,etc) to seperate parts. components and directives have seperate modules to import in project.

imports: [


A4 have a BaseComponent that provide common services for other components, BaseComponent have two Generic types, First one is component model and second is component service for CRUD and other database interactions.For dynamic injection BaseComponent use Injector and ReflectiveInjector for resolve and create providers and services.When a component extends BaseComponent by inheritance component have two property: a model and service.

export class SampleComponent extends BaseComponent<User,UserService> implements OnInit {

  constructor(injector : Injector){
  onSubmit() : void{;

  ngOnInit() {




A4 have a HttpService that use Angular native http provider for database interactions.


A4 have a JsonpService that use Angular native http provider for database interactions.


A4 have a BaseDataService that provide common CRUD actions like: (POST,GET,GETALL,...), BaseDataService have one Generic type that is the service model.BaseDataService use HttpService for CRUD.

for example when an app service extends BaseDataService then it have all common methods already and could have more specific methods.

export class UserService extends BaseDataService<User>{

  constructor(injector : Injector) {
  public login(user : User) : Obervable<T> {



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This project was generated with Angular CLI version 1.3.2.

Development server

Run ng serve for a dev server. Navigate to http://localhost:4200/. The app will automatically reload if you change any of the source files.

Code scaffolding

Run ng generate component component-name to generate a new component. You can also use ng generate directive|pipe|service|class|guard|interface|enum|module.


Run ng build to build the project. The build artifacts will be stored in the dist/ directory. Use the -prod flag for a production build.

Running unit tests

Run ng test to execute the unit tests via Karma.

Running end-to-end tests

Run ng e2e to execute the end-to-end tests via Protractor. Before running the tests make sure you are serving the app via ng serve.

Further help

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