Service

<!DOCTYPE html>
<html>

  <head>
    <base href="." />
    <title>angular playground</title>
    <link rel="stylesheet" href="style.css" />
    <script src="https://unpkg.com/core-js@2.4.1/client/shim.min.js"></script>
    <script src="https://unpkg.com/zone.js/dist/zone.js"></script>
    <script src="https://unpkg.com/zone.js/dist/long-stack-trace-zone.js"></script>
    <script src="https://unpkg.com/reflect-metadata@0.1.3/Reflect.js"></script>
    <script src="https://unpkg.com/systemjs@0.19.31/dist/system.js"></script>
    <script src="config.js"></script>
    <script>
    System.import('app')
      .catch(console.error.bind(console));
  </script>
  </head>

  <body>
    <my-app>
    loading...
  </my-app>
  </body>

</html>

/* Styles go here */

### Angular Starter Plunker - Typescript

System.config({
  //use typescript for compilation
  transpiler: 'typescript',
  //typescript compiler options
  typescriptOptions: {
    emitDecoratorMetadata: true
  },
  paths: {
    'npm:': 'https://unpkg.com/'
  },
  //map tells the System loader where to look for things
  map: {
    
    'app': './src',
    
    '@angular/core': 'npm:@angular/core/bundles/core.umd.js',
    '@angular/common': 'npm:@angular/common/bundles/common.umd.js',
    '@angular/compiler': 'npm:@angular/compiler/bundles/compiler.umd.js',
    '@angular/platform-browser': 'npm:@angular/platform-browser/bundles/platform-browser.umd.js',
    '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic/bundles/platform-browser-dynamic.umd.js',
    '@angular/http': 'npm:@angular/http/bundles/http.umd.js',
    '@angular/router': 'npm:@angular/router/bundles/router.umd.js',
    '@angular/forms': 'npm:@angular/forms/bundles/forms.umd.js',
    '@angular/animations': 'npm:@angular/animations/bundles/animations.umd.js',
    '@angular/platform-browser/animations': 'npm:@angular/platform-browser/bundles/platform-browser-animations.umd.js',
    '@angular/animations/browser': 'npm:@angular/animations/bundles/animations-browser.umd.js',
    
    '@angular/core/testing': 'npm:@angular/core/bundles/core-testing.umd.js',
    '@angular/common/testing': 'npm:@angular/common/bundles/common-testing.umd.js',
    '@angular/compiler/testing': 'npm:@angular/compiler/bundles/compiler-testing.umd.js',
    '@angular/platform-browser/testing': 'npm:@angular/platform-browser/bundles/platform-browser-testing.umd.js',
    '@angular/platform-browser-dynamic/testing': 'npm:@angular/platform-browser-dynamic/bundles/platform-browser-dynamic-testing.umd.js',
    '@angular/http/testing': 'npm:@angular/http/bundles/http-testing.umd.js',
    '@angular/router/testing': 'npm:@angular/router/bundles/router-testing.umd.js',
    
    'rxjs': 'npm:rxjs',
    'typescript': 'npm:typescript@2.2.1/lib/typescript.js'
  },
  //packages defines our app package
  packages: {
    app: {
      main: './main.ts',
      defaultExtension: 'ts'
    },
    rxjs: {
      defaultExtension: 'js'
    }
  }
});

//main entry point
import {platformBrowserDynamic} from '@angular/platform-browser-dynamic';
import {AppModule} from './app';

platformBrowserDynamic().bootstrapModule(AppModule)

//our root app component
import {Component, NgModule, VERSION, OnInit,} from '@angular/core'
import {BrowserModule} from '@angular/platform-browser'
import { ShowUserComponent } from './show-user/show-user.component';
import { UserService } from './user.service';
import { LoggingService } from './logging.service';
import { ShowUserComponent } from './show-user/show-user.component';
import { FormsModule } from '@angular/forms';  

@Component({
  selector: 'my-app',
  template: `
    name:<input type="text" [(ngModel)]="name"><br />
    age: <input type="number" [(ngModel)]="age"><br />
    <button (click)="addUser()">Add User</button>
    <app-show-user></app-show-user>
  `,
})
export class App implements OnInit{
  name:string;
  age:number;
  constructor(private userService: UserService) {
  }
  
  ngOnInit(): void {
  }
  
  addUser(name:string ,age: number){
    this.userService.addUser(this.name, this.age);
  }
}

@NgModule({
  imports: [ BrowserModule, FormsModule ],
  declarations: [ App, ShowUserComponent  ],
  bootstrap: [ App ],
  providers:[UserService, LoggingService]
})
export class AppModule {}

import { LoggingService } from './logging.service';
import { Injectable, EventEmitter } from '@angular/core';

@Injectable()
export class UserService {

  users: { name: string, age: number }[] = [];
  onUserAdded = new EventEmitter<{ name: string, age: number }>();

  constructor(private loggingService: LoggingService) { }

  addUser(name: string, age: number) {
    this.users.push({ name: name, age: age });
    this.loggingService.addLog('New user added: ' + name + ' / ' + age);
    this.onUserAdded.emit({ name: name, age: age });
  }
}

import { UserService } from '../user.service';
import { Component, OnInit } from '@angular/core';

@Component({
  selector: 'app-show-user',
  templateUrl: './src/show-user/show-user.component.html' ,
  styleUrls: []
})
export class ShowUserComponent implements OnInit {
  name: string;
  age: number;
  constructor(private userService: UserService) {
    this.userService.onUserAdded.subscribe(
      (user: { name: string, age: number }) => {
        this.name = user.name;
        this.age = user.age;
      }
    );
  }

  ngOnInit() {
  }

}

<p>
  New User: {{name}} <br />Age: {{age}}
</p>

import { Injectable } from '@angular/core';

@Injectable()
export class LoggingService {

  constructor() { }

  addLog(message: string) {
    console.log('message: ' + message);
  }
}