Angular : Lifecycle Hooks

<!DOCTYPE html>
<html>

  <head>
    <base href="." />
    <script type="text/javascript" charset="utf-8">
      window.AngularVersionForThisPlunker = 'latest'
    </script>
    <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>
    <div>This example is a part of the tutorial - <a href="https://angularbytes.witspry.com/2017/09/angular-5-life-cycle-hooks.html">	
https://angularbytes.witspry.com/2017/09/angular-5-life-cycle-hooks.html</a> </div>
    <div style="margin-bottom:20px;"></div>
    <div style="text-align:center;border-bottom-style:solid;"></div>
    <div style="margin-bottom:20px;"></div>
    <my-app>
    loading...
  </my-app>
  </body>

</html>

/* Styles go here */

### Angular Starter Plunker - Typescript

var angularVersion = '@5.0.0'; 

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'+ angularVersion + '/bundles/core.umd.js',
    '@angular/common': 'npm:@angular/common' + angularVersion + '/bundles/common.umd.js',
    '@angular/common/http': 'npm:@angular/common' + angularVersion + '/bundles/common-http.umd.js',
    '@angular/compiler': 'npm:@angular/compiler' + angularVersion  + '/bundles/compiler.umd.js',
    '@angular/platform-browser': 'npm:@angular/platform-browser' + angularVersion + '/bundles/platform-browser.umd.js',
    '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic' + angularVersion + '/bundles/platform-browser-dynamic.umd.js',
    '@angular/http': 'npm:@angular/http' + angularVersion + '/bundles/http.umd.js',
    '@angular/router': 'npm:@angular/router' + angularVersion +'/bundles/router.umd.js',
    '@angular/forms': 'npm:@angular/forms' + angularVersion + '/bundles/forms.umd.js',
    '@angular/animations': 'npm:@angular/animations' + angularVersion + '/bundles/animations.umd.js',
    '@angular/platform-browser/animations': 'npm:@angular/platform-browser' + angularVersion + '/bundles/platform-browser-animations.umd.js',
    '@angular/animations/browser': 'npm:@angular/animations' + angularVersion + '/bundles/animations-browser.umd.js',
    
    '@angular/core/testing': 'npm:@angular/core' + angularVersion + '/bundles/core-testing.umd.js',
    '@angular/common/testing': 'npm:@angular/common' + angularVersion + '/bundles/common-testing.umd.js',
    '@angular/common/http/testing': 'npm:@angular/common' + angularVersion + '/bundles/common-http-testing.umd.js',
    '@angular/compiler/testing': 'npm:@angular/compiler' + angularVersion + '/bundles/compiler-testing.umd.js',
    '@angular/platform-browser/testing': 'npm:@angular/platform-browser' + angularVersion + '/bundles/platform-browser-testing.umd.js',
    '@angular/platform-browser-dynamic/testing': 'npm:@angular/platform-browser-dynamic' + angularVersion + '/bundles/platform-browser-dynamic-testing.umd.js',
    '@angular/http/testing': 'npm:@angular/http' + angularVersion + '/bundles/http-testing.umd.js',
    '@angular/router/testing': 'npm:@angular/router' + angularVersion + '/bundles/router-testing.umd.js',
    'tslib': 'npm:tslib@1.6.1',
    'rxjs': 'npm:rxjs@5.0.0',
    'typescript': 'npm:typescript@2.2.1/lib/typescript.js'
  },
  //packages defines our app package
  packages: {
    app: {
      main: './main.ts',
      defaultExtension: 'ts'
    },
    rxjs: {
      main: 'index.js',
      map:{
        './operators' : './operators/index.js'
      },
      defaultExtension: ''
    }
  }
});

//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} from '@angular/core'
import {BrowserModule} from '@angular/platform-browser'
import { FormsModule } from '@angular/forms';
import {Signup} from './signup'
import {Random} from './random'

@Component({
  selector: 'my-app',
  template: `
    <h2>Press F12 to see the lifecycle events in console</h2>
    <div>
      <input type='button' (click)='toggleSignup()' value='{{btnText}} Signup'>
    </div>
    <div *ngIf='showSignup'>
      <signup></signup>
    </div>
  `,
})
export class App {
  name:string;
  boolean: showSignup;
  btnText: string;
  constructor() {
    this.showSignup = false;
    this.btnText = 'Show';
  }
  
  toggleSignup(){
    this.showSignup = !this.showSignup;
    this.btnText = this.showSignup ? 'Hide' : 'Show';
  }
}

@NgModule({
  imports: [ BrowserModule, FormsModule ],
  declarations: [ App, Signup, Random ],
  bootstrap: [ App ]
})
export class AppModule {}

import {Component, Injectable} from '@angular/core'

@Component({
  selector: 'signup',
  template: `
    <div>
      <h2>Name : </h2>
      <input type='text' [(ngModel)]='name' />
      <input type='text' [(ngModel)]='prefix' />
      <random [salt]='prefix'
                          (generatePassword)='onGeneratePassword($event)'></random>
      <h3>Password : {{password}}</h3>
    </div>
  `
})
export class Signup implements OnInit, OnChanges, DoCheck, AfterViewChecked, AfterViewInit, AfterContentInit, AfterContentChecked, OnDestroy{
  name:string = 'Angular';
  prefix:string = ''; 
  password: string = '';
  constructor(){
   this.name = 'Angular 2';
   console.log('Parent constructor() called');
  }
  
  onGeneratePassword(pwd: string){
    console.log('clle')
    this.password = pwd;
  }
  
  ngOnInit(){
    this.name = 'Angular 5';
    console.log('Parent ngOnInit() called');
  }
  
  ngOnChanges(){
    console.log('Parent ngOnChanges() called');
  }
  
  ngDoCheck(){
    console.log('Parent ngDoCheck() called')
  }
  
  ngAfterViewChecked(){
    console.log('Parent ngAfterViewChecked() called');
  } 
  
  ngAfterViewInit(){
    console.log('Parent ngAfterViewInit() called');
  }
  
  ngAfterContentInit(){
    console.log('Parent ngAfterContentInit() called');
  }
  
  ngAfterContentChecked(){
    console.log('Parent ngAfterContentChecked() called');
  }
  
  ngOnDestroy(){
    console.log('Parent ngOnDestroy() called');
  }
}

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

@Component({
  selector: 'random',
  template: `
    <div>
      <input type='button' (click)='random()' value='Generate Password' />
    </div>
  `
})
export class Random implements OnInit, OnChanges, DoCheck, AfterViewChecked, AfterViewInit, AfterContentInit, AfterContentChecked, OnDestroy{
  @Input() salt:string;
  @Output() generatePassword: EventEmitter<string> = new EventEmitter<string>();
  constructor(){
   this.salt = '';
   console.log('Child constructor() called');
  }
  
  random(){
    var t = new Date().getTime();
    this.generatePassword.emit(this.salt + t.toString());
  }
  
  ngOnInit(){
    console.log('Child ngOnInit() called');
  }
  
  ngOnChanges(){
    console.log('Child ngOnChanges() called');
  }
  
  ngDoCheck(){
    console.log('Child ngDoCheck() called');
  }
  
  ngAfterViewChecked(){
    console.log('Child ngAfterViewChecked() called');
  } 
  
  ngAfterViewInit(){
    console.log('Child ngAfterViewInit() called');
  }
  
  ngAfterContentInit(){
    console.log('Child ngAfterContentInit() called');
  }
  
  ngAfterContentChecked(){
    console.log('Child ngAfterContentChecked() called');
  }
  
  ngOnDestroy(){
    console.log('Child ngOnDestroy() called');
  }
  
}