EventEmitter Angular2 Example

import { Component } from '@angular/core';
import {ParentComponent} from './parent.component';

@Component({
  selector: 'my-app',
  template: `<parent></parent>`
})
export class AppComponent {
  
}

import { NgModule }      from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { FormsModule }   from '@angular/forms';

import { AppComponent }  from './app.component';
import { ParentComponent }  from './parent.component';
import { ChildComponent }  from './child.component';

@NgModule({
  imports: [
    BrowserModule,
    FormsModule,
  ],
  declarations: [
    AppComponent,
    ParentComponent,
    ChildComponent
  ],
  bootstrap: [ AppComponent ]
})
export class AppModule { }

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

platformBrowserDynamic().bootstrapModule(AppModule);

<!DOCTYPE html>
<html>
  <head>
    <title>Angular Tour of Heroes</title>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="styles.css">

    <!-- Polyfills for older browsers -->
    <script src="https://unpkg.com/core-js/client/shim.min.js"></script>

    <script src="https://unpkg.com/zone.js@0.6.25?main=browser"></script>
    <script src="https://unpkg.com/reflect-metadata@0.1.8"></script>
    <script src="https://unpkg.com/systemjs@0.19.39/dist/system.src.js"></script>

    <script src="https://cdn.rawgit.com/angular/angular.io/b3c65a9/public/docs/_examples/_boilerplate/systemjs.config.web.js"></script>
    <script>
      System.import('app').catch(function(err){ console.error(err); });
    </script>
  </head>

  <body>
    <my-app>Loading...</my-app>
  </body>
</html>

import {Component, EventEmitter, Output} from '@angular/core';

@Component({
  moduleId: module.id,
  selector: 'child',
  templateUrl: 'child.component.html'
})
export class ChildComponent{
  @Output()
  childChanged = new EventEmitter<string>();
  
  onChange(value:string){
    this.childChanged.emit(value)
  }
}

import {Component} from '@angular/core';
import {ChildComponent} from './child.component';

@Component({
  moduleId: module.id,
  selector: 'parent',
  templateUrl: 'parent.component.html',
  directives: [ChildComponent]
})
export class ParentComponent{
  public inputFromChild: string;
}

<div>
  <input type="text" #childInput (keyup)="onChange(childInput.value)">
</div>

<label for="parent">Parent</label>
<p>{{inputFromChild}}</p>

<label for="child">Child Input</label>
<child id="child" (childChanged)="inputFromChild = $event"></child>