Angular 2 Example - Lifecycle Hooks

import { AfterContentChecked, AfterContentInit, Component, ContentChild } from '@angular/core';

import { LoggerService }  from './logger.service';

//////////////////
@Component({
  selector: 'my-child',
  template: '<input [(ngModel)]="hero">'
})
export class ChildComponent {
  hero = 'Magneta';
}

//////////////////////
@Component({
  selector: 'after-content',
  template: `
    <div>-- projected content begins --</div>
      <ng-content></ng-content>
    <div>-- projected content ends --</div>`
   + `
    <p *ngIf="comment" class="comment">
      {{comment}}
    </p>
  `
})
export class AfterContentComponent implements AfterContentChecked, AfterContentInit {
  private prevHero = '';
  comment = '';

  // Query for a CONTENT child of type `ChildComponent`
  @ContentChild(ChildComponent) contentChild: ChildComponent;

  constructor(private logger: LoggerService) {
    this.logIt('AfterContent constructor');
  }

  ngAfterContentInit() {
    // contentChild is set after the content has been initialized
    this.logIt('AfterContentInit');
    this.doSomething();
  }

  ngAfterContentChecked() {
    // contentChild is updated after the content has been checked
    if (this.prevHero === this.contentChild.hero) {
      this.logIt('AfterContentChecked (no change)');
    } else {
      this.prevHero = this.contentChild.hero;
      this.logIt('AfterContentChecked');
      this.doSomething();
    }
  }

  // This surrogate for real business logic sets the `comment`
  private doSomething() {
    this.comment = this.contentChild.hero.length > 10 ? `That's a long name` : '';
  }

  private logIt(method: string) {
    let child = this.contentChild;
    let message = `${method}: ${child ? child.hero : 'no'} child content`;
    this.logger.log(message);
  }
  // ...
}

//////////////
@Component({
  selector: 'after-content-parent',
  template: `
  <div class="parent">
    <h2>AfterContent</h2>

    <div *ngIf="show">` +
     `<after-content>
        <my-child></my-child>
      </after-content>`
+ `</div>

    <h4>-- AfterContent Logs --</h4>
    <p><button (click)="reset()">Reset</button></p>
    <div *ngFor="let msg of logs">{{msg}}</div>
  </div>
  `,
  styles: ['.parent {background: burlywood}'],
  providers: [LoggerService],
  directives: [AfterContentComponent, ChildComponent]
})
export class AfterContentParentComponent {
  logs: string[];
  show = true;

  constructor(private logger: LoggerService) {
    this.logs = logger.logs;
  }

  reset() {
    this.logs.length = 0;
    // quickly remove and reload AfterContentComponent which recreates it
    this.show = false;
    this.logger.tick_then(() => this.show = true);
  }
}


/*
Copyright 2016 Google Inc. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at http://angular.io/license
*/

import { AfterViewChecked, AfterViewInit, Component, ViewChild } from '@angular/core';

import { LoggerService }  from './logger.service';

//////////////////
@Component({
  selector: 'my-child',
  template: '<input [(ngModel)]="hero">'
})
export class ChildViewComponent {
  hero = 'Magneta';
}

//////////////////////
@Component({
  selector: 'after-view',
  template: `
    <div>-- child view begins --</div>
      <my-child></my-child>
    <div>-- child view ends --</div>`
   + `
    <p *ngIf="comment" class="comment">
      {{comment}}
    </p>
  `,
  directives: [ChildViewComponent]
})
export class AfterViewComponent implements  AfterViewChecked, AfterViewInit {
  private prevHero = '';

  // Query for a VIEW child of type `ChildViewComponent`
  @ViewChild(ChildViewComponent) viewChild: ChildViewComponent;

  constructor(private logger: LoggerService) {
    this.logIt('AfterView constructor');
  }

  ngAfterViewInit() {
    // viewChild is set after the view has been initialized
    this.logIt('AfterViewInit');
    this.doSomething();
  }

  ngAfterViewChecked() {
    // viewChild is updated after the view has been checked
    if (this.prevHero === this.viewChild.hero) {
      this.logIt('AfterViewChecked (no change)');
    } else {
      this.prevHero = this.viewChild.hero;
      this.logIt('AfterViewChecked');
      this.doSomething();
    }
  }

  comment = '';

  // This surrogate for real business logic sets the `comment`
  private doSomething() {
    let c = this.viewChild.hero.length > 10 ? `That's a long name` : '';
    if (c !== this.comment) {
      // Wait a tick because the component's view has already been checked
      this.logger.tick_then(() => this.comment = c);
    }
  }

  private logIt(method: string) {
    let child = this.viewChild;
    let message = `${method}: ${child ? child.hero : 'no'} child view`;
    this.logger.log(message);
  }
  // ...
}

//////////////
@Component({
  selector: 'after-view-parent',
  template: `
  <div class="parent">
    <h2>AfterView</h2>

    <after-view  *ngIf="show"></after-view>

    <h4>-- AfterView Logs --</h4>
    <p><button (click)="reset()">Reset</button></p>
    <div *ngFor="let msg of logs">{{msg}}</div>
  </div>
  `,
  styles: ['.parent {background: burlywood}'],
  providers: [LoggerService],
  directives: [AfterViewComponent]
})
export class AfterViewParentComponent {
  logs: string[];
  show = true;

  constructor(private logger: LoggerService) {
    this.logs = logger.logs;
  }

  reset() {
    this.logs.length = 0;
    // quickly remove and reload AfterViewComponent which recreates it
    this.show = false;
    this.logger.tick_then(() => this.show = true);
  }
}


/*
Copyright 2016 Google Inc. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at http://angular.io/license
*/

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

import { AfterContentParentComponent } from './after-content.component';
import { AfterViewParentComponent } from './after-view.component';
import { CounterParentComponent } from './counter.component';
import { DoCheckParentComponent } from './do-check.component';
import { OnChangesParentComponent } from './on-changes.component';
import { PeekABooParentComponent } from './peek-a-boo-parent.component';
import { SpyParentComponent } from './spy.component';

@Component({
  selector: 'my-app',
  templateUrl: 'app/app.component.html',
  directives: [
    AfterContentParentComponent,
    AfterViewParentComponent,
    CounterParentComponent,
    DoCheckParentComponent,
    OnChangesParentComponent,
    PeekABooParentComponent,
    SpyParentComponent,
  ]
})
export class AppComponent {
}


/*
Copyright 2016 Google Inc. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at http://angular.io/license
*/

import {
  Component, Input,
  OnChanges, SimpleChange,
} from '@angular/core';

import { SpyDirective } from './spy.directive';
import { LoggerService }  from './logger.service';

@Component({
  selector: 'my-counter',
  template: `
  <div class="counter">
    Counter = {{counter}}

    <h5>-- Counter Change Log --</h5>
    <div *ngFor="let chg of changeLog" mySpy>{{chg}}</div>
  </div>
  `,
  styles: ['.counter {background: LightYellow; padding: 8px; margin-top: 8px}'],
  directives: [SpyDirective]
})
export class MyCounterComponent implements OnChanges {
  @Input() counter: number;
  changeLog: string[] = [];

  ngOnChanges(changes: {[propertyName: string]: SimpleChange}) {

    // Empty the changeLog whenever counter goes to zero
    // hint: this is a way to respond programmatically to external value changes.
    if (this.counter === 0) {
      this.changeLog.length = 0;
    }

    // A change to `counter` is the only change we care about
    let chng = changes['counter'];
    let cur = chng.currentValue;
    let prev = JSON.stringify(chng.previousValue); // first time is {}; after is integer
    this.changeLog.push(`counter: currentValue = ${cur}, previousValue = ${prev}`);
  }

}

/***************************************/

@Component({
  selector: 'counter-parent',
  template: `
   <div class="parent">
    <h2>Counter Spy</h2>

    <button (click)="updateCounter()">Update counter</button>
    <button (click)="reset()">Reset Counter</button>

    <my-counter [counter]="value"></my-counter>

    <h4>-- Spy Lifecycle Hook Log --</h4>
    <div *ngFor="let msg of spyLog">{{msg}}</div>
   </div>
  `,
  styles: ['.parent {background: gold;}'],
  directives: [MyCounterComponent],
  providers: [LoggerService]
})
export class CounterParentComponent {
  value: number;
  spyLog: string[] = [];

  private logger: LoggerService;

  constructor(logger: LoggerService) {
    this.logger = logger;
    this.spyLog = logger.logs;
    this.reset();
  }

  updateCounter() {
    this.value += 1;
    this.logger.tick();
  }

  reset() {
    this.logger.log('-- reset --');
    this.value = 0;
    this.logger.tick();
  }
}



/*
Copyright 2016 Google Inc. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at http://angular.io/license
*/

/* tslint:disable:forin */
import { Component, DoCheck, Input, OnChanges, SimpleChange, ViewChild } from '@angular/core';

class Hero {
  constructor(public name: string) {}
}

@Component({
  selector: 'do-check',
  template: `
  <div class="hero">
    <p>{{hero.name}} can {{power}}</p>

    <h4>-- Change Log --</h4>
    <div *ngFor="let chg of changeLog">{{chg}}</div>
  </div>
  `,
  styles: [
    '.hero {background: LightYellow; padding: 8px; margin-top: 8px}',
    'p {background: Yellow; padding: 8px; margin-top: 8px}'
  ]
})
export class DoCheckComponent implements DoCheck, OnChanges {
  @Input() hero: Hero;
  @Input() power: string;

  changeDetected = false;
  changeLog: string[] = [];
  oldHeroName = '';
  oldPower = '';
  oldLogLength = 0;
  noChangeCount = 0;

  ngDoCheck() {

    if (this.hero.name !== this.oldHeroName) {
      this.changeDetected = true;
      this.changeLog.push(`DoCheck: Hero name changed to "${this.hero.name}" from "${this.oldHeroName}"`);
      this.oldHeroName = this.hero.name;
    }

    if (this.power !== this.oldPower) {
      this.changeDetected = true;
      this.changeLog.push(`DoCheck: Power changed to "${this.power}" from "${this.oldPower}"`);
      this.oldPower = this.power;
    }

    if (this.changeDetected) {
        this.noChangeCount = 0;
    } else {
        // log that hook was called when there was no relevant change.
        let count = this.noChangeCount += 1;
        let noChangeMsg = `DoCheck called ${count}x when no change to hero or power`;
        if (count === 1) {
          // add new "no change" message
          this.changeLog.push(noChangeMsg);
        } else {
          // update last "no change" message
          this.changeLog[this.changeLog.length - 1] = noChangeMsg;
        }
    }

    this.changeDetected = false;
  }

  // Copied from OnChangesComponent
  ngOnChanges(changes: {[propertyName: string]: SimpleChange}) {
    for (let propName in changes) {
      let chng = changes[propName];
      let cur  = JSON.stringify(chng.currentValue);
      let prev = JSON.stringify(chng.previousValue);
      this.changeLog.push(`OnChanges: ${propName}: currentValue = ${cur}, previousValue = ${prev}`);
    }
  }

  reset() {
    this.changeDetected = true;
    this.changeLog.length = 0;
  }
}

/***************************************/

@Component({
  selector: 'do-check-parent',
  templateUrl: 'app/on-changes-parent.component.html',
  styles: ['.parent {background: Lavender}'],
  directives: [DoCheckComponent]
})
export class DoCheckParentComponent {
  hero: Hero;
  power: string;
  title = 'DoCheck';
  @ViewChild(DoCheckComponent) childView: DoCheckComponent;

  constructor() { this.reset(); }

  reset() {
    this.hero = new Hero('Windstorm');
    this.power = 'sing';
    if (this.childView) { this.childView.reset(); }
  }
}


/*
Copyright 2016 Google Inc. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at http://angular.io/license
*/

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

@Injectable()
export class LoggerService {
  logs: string[] = [];
  prevMsg = '';
  prevMsgCount = 1;

  log(msg: string)  {
    if (msg === this.prevMsg) {
      // Repeat message; update last log entry with count.
      this.logs[this.logs.length - 1] = msg + ` (${this.prevMsgCount += 1}x)`;
    } else {
      // New message; log it.
      this.prevMsg = msg;
      this.prevMsgCount = 1;
      this.logs.push(msg);
    }
  }

  clear() { this.logs.length = 0; }

  // schedules a view refresh to ensure display catches up
  tick() {  this.tick_then(() => { }); }
  tick_then(fn: () => any) { setTimeout(fn, 0); }
}


/*
Copyright 2016 Google Inc. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at http://angular.io/license
*/

import { bootstrap } from '@angular/platform-browser-dynamic';

import { AppComponent } from './app.component';

bootstrap(AppComponent).catch(err => console.error(err));


/*
Copyright 2016 Google Inc. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at http://angular.io/license
*/

/* tslint:disable:forin */
import {
  Component, Input, OnChanges,
  SimpleChange, ViewChild
} from '@angular/core';


class Hero {
  constructor(public name: string) {}
}

@Component({
  selector: 'on-changes',
  template: `
  <div class="hero">
    <p>{{hero.name}} can {{power}}</p>

    <h4>-- Change Log --</h4>
    <div *ngFor="let chg of changeLog">{{chg}}</div>
  </div>
  `,
  styles: [
    '.hero {background: LightYellow; padding: 8px; margin-top: 8px}',
    'p {background: Yellow; padding: 8px; margin-top: 8px}'
  ]
})
export class OnChangesComponent implements OnChanges {
  @Input() hero: Hero;
  @Input() power: string;

  changeLog: string[] = [];

  ngOnChanges(changes: {[propertyName: string]: SimpleChange}) {
    for (let propName in changes) {
      let chng = changes[propName];
      let cur  = JSON.stringify(chng.currentValue);
      let prev = JSON.stringify(chng.previousValue);
      this.changeLog.push(`${propName}: currentValue = ${cur}, previousValue = ${prev}`);
    }
  }

  reset() { this.changeLog.length = 0; }
}

/***************************************/

@Component({
  selector: 'on-changes-parent',
  templateUrl: 'app/on-changes-parent.component.html',
  styles: ['.parent {background: Lavender;}'],
  directives: [OnChangesComponent]
})
export class OnChangesParentComponent {
  hero: Hero;
  power: string;
  title = 'OnChanges';
  @ViewChild(OnChangesComponent) childView: OnChangesComponent;

  constructor() {
    this.reset();
  }

  reset() {
    // new Hero object every time; triggers onChanges
    this.hero = new Hero('Windstorm');
    // setting power only triggers onChanges if this value is different
    this.power = 'sing';
    if (this.childView) { this.childView.reset(); }
  }
}


/*
Copyright 2016 Google Inc. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at http://angular.io/license
*/

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

import { PeekABooComponent } from './peek-a-boo.component';
import { LoggerService } from './logger.service';

@Component({
  selector: 'peek-a-boo-parent',
  template: `
  <div class="parent">
    <h2>Peek-A-Boo</h2>

    <button (click)="toggleChild()">
      {{hasChild ? 'Destroy' : 'Create'}} PeekABooComponent
    </button>
    <button (click)="updateHero()" [hidden]="!hasChild">Update Hero</button>

    <peek-a-boo *ngIf="hasChild" [name]="heroName">
    </peek-a-boo>

    <h4>-- Lifecycle Hook Log --</h4>
    <div *ngFor="let msg of hookLog">{{msg}}</div>
  </div>
  `,
  styles: ['.parent {background: moccasin}'],
  directives: [PeekABooComponent],
  providers: [LoggerService]
})
export class PeekABooParentComponent {

  hasChild = false;
  hookLog: string[];

  heroName = 'Windstorm';
  private logger: LoggerService;

  constructor(logger: LoggerService) {
    this.logger = logger;
    this.hookLog = logger.logs;
  }

  toggleChild() {
    this.hasChild = !this.hasChild;
    if (this.hasChild) {
      this.heroName = 'Windstorm';
      this.logger.clear(); // clear log on create
    }
    this.logger.tick();
  }

  updateHero() {
    this.heroName += '!';
    this.logger.tick();
  }
}


/*
Copyright 2016 Google Inc. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at http://angular.io/license
*/

import {
  AfterContentChecked,
  AfterContentInit,
  AfterViewChecked,
  AfterViewInit,
  DoCheck,
  OnChanges,
  OnDestroy,
  OnInit,
  SimpleChange
} from '@angular/core';
import { Component, Input } from '@angular/core';
import { LoggerService }    from './logger.service';

let nextId = 1;

export class PeekABoo implements OnInit {
  constructor(private logger: LoggerService) { }

  // implement OnInit's `ngOnInit` method
  ngOnInit() { this.logIt(`OnInit`); }

  protected logIt(msg: string) {
    this.logger.log(`#${nextId++} ${msg}`);
  }
}

@Component({
  selector: 'peek-a-boo',
  template: '<p>Now you see my hero, {{name}}</p>',
  styles: ['p {background: LightYellow; padding: 8px}']
})
// Don't HAVE to mention the Lifecycle Hook interfaces
// unless we want typing and tool support.
export class PeekABooComponent extends PeekABoo implements
             OnChanges, OnInit, DoCheck,
             AfterContentInit, AfterContentChecked,
             AfterViewInit, AfterViewChecked,
             OnDestroy {
  @Input()  name: string;

  private verb = 'initialized';

  constructor(logger: LoggerService) {
    super(logger);

    let is = this.name ? 'is' : 'is not';
    this.logIt(`name ${is} known at construction`);
  }

  // only called for/if there is an @input variable set by parent.
  ngOnChanges(changes: {[propertyName: string]: SimpleChange}) {
    let changesMsgs: string[] = [];
    for (let propName in changes) {
      if (propName === 'name') {
        let name = changes['name'].currentValue;
        changesMsgs.push(`name ${this.verb} to "${name}"`);
      } else {
        changesMsgs.push(propName + ' ' + this.verb);
      }
    }
    this.logIt(`OnChanges: ${changesMsgs.join('; ')}`);
    this.verb = 'changed'; // next time it will be a change
  }

  // Beware! Called frequently!
  // Called in every change detection cycle anywhere on the page
  ngDoCheck() { this.logIt(`DoCheck`); }

  ngAfterContentInit() { this.logIt(`AfterContentInit`);  }

  // Beware! Called frequently!
  // Called in every change detection cycle anywhere on the page
  ngAfterContentChecked() { this.logIt(`AfterContentChecked`); }

  ngAfterViewInit() { this.logIt(`AfterViewInit`); }

  // Beware! Called frequently!
  // Called in every change detection cycle anywhere on the page
  ngAfterViewChecked() { this.logIt(`AfterViewChecked`); }

  ngOnDestroy() { this.logIt(`OnDestroy`); }
}


/*
Copyright 2016 Google Inc. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at http://angular.io/license
*/

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

import { LoggerService }  from './logger.service';
import { SpyDirective } from './spy.directive';

@Component({
  selector: 'spy-parent',
  templateUrl: 'app/spy.component.html',
  styles: [
     '.parent {background: khaki;}',
     '.heroes {background: LightYellow; padding: 0 8px}'
  ],
  directives: [SpyDirective],
  providers:  [LoggerService]
})
export class SpyParentComponent {
  newName = 'Herbie';
  heroes: string[] = ['Windstorm', 'Magneta'];
  spyLog: string[];

  constructor(private logger: LoggerService) {
    this.spyLog = logger.logs;
  }

  addHero() {
    if (this.newName.trim()) {
      this.heroes.push(this.newName.trim());
      this.newName = '';
      this.logger.tick();
    }
  }
  removeHero(hero: string) {
    this.heroes.splice(this.heroes.indexOf(hero), 1);
    this.logger.tick();
  }
  reset() {
    this.logger.log('-- reset --');
    this.heroes.length = 0;
    this.logger.tick();
  }
}


/*
Copyright 2016 Google Inc. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at http://angular.io/license
*/

import { Directive, OnInit, OnDestroy } from '@angular/core';

import { LoggerService } from './logger.service';

let nextId = 1;

// Spy on any element to which it is applied.
// Usage: <div mySpy>...</div>
@Directive({selector: '[mySpy]'})
export class SpyDirective implements OnInit, OnDestroy {

  constructor(private logger: LoggerService) { }

  ngOnInit()    { this.logIt(`onInit`); }

  ngOnDestroy() { this.logIt(`onDestroy`); }

  private logIt(msg: string) {
    this.logger.log(`Spy #${nextId++} ${msg}`);
  }
}


/*
Copyright 2016 Google Inc. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at http://angular.io/license
*/

.parent {
  color: #666;
  margin: 14px 0;
  padding: 8px;
}
input {
  margin: 4px;
  padding: 4px;
}
.comment {
  color: red;
  font-style: italic;
}


/*
Copyright 2016 Google Inc. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at http://angular.io/license
*/

/* Master Styles */
h1 {
  color: #369;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 250%;
}
h2, h3 {
  color: #444;
  font-family: Arial, Helvetica, sans-serif;
  font-weight: lighter;
}
body {
  margin: 2em;
}
body, input[text], button {
  color: #888;
  font-family: Cambria, Georgia;
}
a {
  cursor: pointer;
  cursor: hand;
}
button {
  font-family: Arial;
  background-color: #eee;
  border: none;
  padding: 5px 10px;
  border-radius: 4px;
  cursor: pointer;
  cursor: hand;
}
button:hover {
  background-color: #cfd8dc;
}
button:disabled {
  background-color: #eee;
  color: #aaa;
  cursor: auto;
}

/* Navigation link styles */
nav a {
  padding: 5px 10px;
  text-decoration: none;
  margin-top: 10px;
  display: inline-block;
  background-color: #eee;
  border-radius: 4px;
}
nav a:visited, a:link {
  color: #607D8B;
}
nav a:hover {
  color: #039be5;
  background-color: #CFD8DC;
}
nav a.active {
  color: #039be5;
}

/* items class */
.items {
  margin: 0 0 2em 0;
  list-style-type: none;
  padding: 0;
  width: 24em;
}
.items li {
  cursor: pointer;
  position: relative;
  left: 0;
  background-color: #EEE;
  margin: .5em;
  padding: .3em 0;
  height: 1.6em;
  border-radius: 4px;
}
.items li:hover {
  color: #607D8B;
  background-color: #DDD;
  left: .1em;
}
.items li.selected:hover {
  background-color: #BBD8DC;
  color: white;
}
.items .text {
  position: relative;
  top: -3px;
}
.items {
  margin: 0 0 2em 0;
  list-style-type: none;
  padding: 0;
  width: 24em;
}
.items li {
  cursor: pointer;
  position: relative;
  left: 0;
  background-color: #EEE;
  margin: .5em;
  padding: .3em 0;
  height: 1.6em;
  border-radius: 4px;
}
.items li:hover {
  color: #607D8B;
  background-color: #DDD;
  left: .1em;
}
.items li.selected {
  background-color: #CFD8DC;
  color: white;
}

.items li.selected:hover {
  background-color: #BBD8DC;
}
.items .text {
  position: relative;
  top: -3px;
}
.items .badge {
  display: inline-block;
  font-size: small;
  color: white;
  padding: 0.8em 0.7em 0 0.7em;
  background-color: #607D8B;
  line-height: 1em;
  position: relative;
  left: -1px;
  top: -4px;
  height: 1.8em;
  margin-right: .8em;
  border-radius: 4px 0 0 4px;
}

/* everywhere else */
* {
  font-family: Arial, Helvetica, sans-serif;
}


/*
Copyright 2016 Google Inc. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at http://angular.io/license
*/

<a id="top"></a>
<h1>Component Lifecycle Hooks</h1>
<a href="#hooks">Peek-a-boo: (most) lifecycle hooks</a><br>
<a href="#onchanges">OnChanges</a><br>
<a href="#docheck">DoCheck</a><br>
<a href="#after-view">AfterViewInit & AfterViewChecked</a><br>
<a href="#after-content">AfterContentInit & AfterContentChecked</a><br>
<a href="#spy">Spy: directive with OnInit & OnDestroy</a><br>
<a href="#counter">Counter: OnChanges + Spy directive</a><br>

<a id="hooks"></a>
<peek-a-boo-parent></peek-a-boo-parent>
<a href="#top">back to top</a>

<a id="spy"></a>
<spy-parent></spy-parent>
<a href="#top">back to top</a>

<a id="onchanges"></a>
<on-changes-parent></on-changes-parent>
<a href="#top">back to top</a>

<a id="docheck"></a>
<do-check-parent></do-check-parent>
<a href="#top">back to top</a>

<a id="after-view"></a>
<after-view-parent></after-view-parent>
<a href="#top">back to top</a>

<a id="after-content"></a>
<after-content-parent></after-content-parent>
<a href="#top">back to top</a>

<a id="counter"></a>
<counter-parent></counter-parent>
<a href="#top">back to top</a>


<!-- 
Copyright 2016 Google Inc. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at http://angular.io/license
-->

<div class="parent">
  <h2>{{title}}</h2>

  <table>
    <tr><td>Power: </td><td><input [(ngModel)]="power"></td></tr>
    <tr><td>Hero.name: </td><td><input [(ngModel)]="hero.name"></td></tr>
  </table>
  <p><button (click)="reset()">Reset Log</button></p>

  <on-changes [hero]="hero" [power]="power"></on-changes>
  <do-check [hero]="hero" [power]="power"></do-check>
</div>


<!-- 
Copyright 2016 Google Inc. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at http://angular.io/license
-->

<div class="parent">
  <h2>Spy Directive</h2>

  <input [(ngModel)]="newName" (keyup.enter)="addHero()">
  <button (click)="addHero()">Add Hero</button>
  <button (click)="reset()">Reset Heroes</button>

  <p></p>
  <div *ngFor="let hero of heroes" mySpy class="heroes">
    {{hero}}
  </div>
  <h4>-- Spy Lifecycle Hook Log --</h4>
  <div *ngFor="let msg of spyLog">{{msg}}</div>
</div>


<!-- 
Copyright 2016 Google Inc. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at http://angular.io/license
-->

<!DOCTYPE html>
<html>
  <head>
    <title>Angular 2 Lifecycle Hooks</title>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="styles.css">
    <link rel="stylesheet" href="sample.css">

    <!-- Polyfill(s) for older browsers -->
    <script src="https://npmcdn.com/core-js/client/shim.min.js"></script>

    <script src="https://npmcdn.com/zone.js@0.6.12?main=browser"></script>
    <script src="https://npmcdn.com/reflect-metadata@0.1.3"></script>
    <script src="https://npmcdn.com/systemjs@0.19.27/dist/system.src.js"></script>

    <script src="systemjs.config.js"></script>
    <script>
      System.import('app').catch(function(err){ console.error(err); });
    </script>
  </head>

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

</html>


<!-- 
Copyright 2016 Google Inc. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at http://angular.io/license
-->

/**
 * PLUNKER VERSION (based on systemjs.config.js in angular.io)
 * System configuration for Angular 2 samples
 * Adjust as necessary for your application needs.
 */
(function(global) {

  var ngVer = '@2.0.0-rc.4'; // lock in the angular package version; do not let it float to current!
  var routerVer = '@3.0.0-beta.1'; // lock router version
  var formsVer = '@0.2.0'; // lock forms version
  var routerDeprecatedVer = '@2.0.0-rc.2'; // temporarily until we update all the guides

  //map tells the System loader where to look for things
  var  map = {
    'app':                        'app',

    '@angular':                   'https://npmcdn.com/@angular', // sufficient if we didn't pin the version
    '@angular/router':            'https://npmcdn.com/@angular/router' + routerVer,
    '@angular/forms':             'https://npmcdn.com/@angular/forms' + formsVer,
    '@angular/router-deprecated': 'https://npmcdn.com/@angular/router-deprecated' + routerDeprecatedVer,
    'angular2-in-memory-web-api': 'https://npmcdn.com/angular2-in-memory-web-api', // get latest
    'rxjs':                       'https://npmcdn.com/rxjs@5.0.0-beta.6',
    'ts':                         'https://npmcdn.com/plugin-typescript@4.0.10/lib/plugin.js',
    'typescript':                 'https://npmcdn.com/typescript@1.9.0-dev.20160409/lib/typescript.js',
 };

  //packages tells the System loader how to load when no filename and/or no extension
  var packages = {
    'app':                        { main: 'main.ts',  defaultExtension: 'ts' },
    'rxjs':                       { defaultExtension: 'js' },
    'angular2-in-memory-web-api': { main: 'index.js', defaultExtension: 'js' },
  };

  var ngPackageNames = [
    'common',
    'compiler',
    'core',
    'http',
    'platform-browser',
    'platform-browser-dynamic',
    'upgrade',
  ];

  // Add map entries for each angular package
  // only because we're pinning the version with `ngVer`.
  ngPackageNames.forEach(function(pkgName) {
    map['@angular/'+pkgName] = 'https://npmcdn.com/@angular/' + pkgName + ngVer;
  });

  // Add package entries for angular packages
  ngPackageNames.forEach(function(pkgName) {

    // Bundled (~40 requests):
    packages['@angular/'+pkgName] = { main: '/bundles/' + pkgName + '.umd.js', defaultExtension: 'js' };

    // Individual files (~300 requests):
    //packages['@angular/'+pkgName] = { main: 'index.js', defaultExtension: 'js' };
  });

  // No umd for router yet
  packages['@angular/router'] = { main: 'index.js', defaultExtension: 'js' };

  // Forms not on rc yet
  packages['@angular/forms'] = { main: 'index.js', defaultExtension: 'js' };

  // Temporarily until we update the guides
  packages['@angular/router-deprecated'] = { main: '/bundles/router-deprecated' + '.umd.js', defaultExtension: 'js' };

  var config = {
    // DEMO ONLY! REAL CODE SHOULD NOT TRANSPILE IN THE BROWSER
    transpiler: 'ts',
    typescriptOptions: {
      tsconfig: true
    },
    meta: {
      'typescript': {
        "exports": "ts"
      }
    },
    map: map,
    packages: packages
  };

  System.config(config);

})(this);


/*
Copyright 2016 Google Inc. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at http://angular.io/license
*/

{
  "compilerOptions": {
    "target": "es5",
    "module": "commonjs",
    "moduleResolution": "node",
    "sourceMap": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "removeComments": false,
    "noImplicitAny": true,
    "suppressImplicitAnyIndexErrors": true
  }
}