Angular2 RouteReuseStrategy Reuse Component

<!DOCTYPE html>
<html>

  <head>
    <base href="." />
    <title>angular2 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>
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
    <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/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@2.0.2/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} from '@angular/core'
import {BrowserModule} from '@angular/platform-browser'
import { RouteReuseStrategy, RouterModule } from '@angular/router';
import { SearchComponent } from './search';
import { PersonComponent, ViewPersonComponent, EditPersonComponent } from './person';
import { DataService } from './data.service';
import { FormsModule } from '@angular/forms';
import { CustomReuseStrategy } from './custom-reuse-strategy';

@Component({
  selector: 'my-app',
  template: `
    <router-outlet></router-outlet>
  `,
})
export class App {
  name:string;
  constructor() {
    this.name = 'Angular2'
  }
}

@NgModule({
  imports: [ BrowserModule, RouterModule.forRoot([
    {path: '', redirectTo: 'search', pathMatch: 'full'},
    {path: 'search', component: SearchComponent},
    {
      path: 'person/:id', component: PersonComponent,
      children:[
        { path: '', redirectTo: 'view', pathMatch: 'full' },
        { path: 'view', component: ViewPersonComponent },
        { path: 'edit', component: EditPersonComponent }
        ]
    }
    ]),FormsModule],
  declarations: [ App, SearchComponent, PersonComponent, ViewPersonComponent, EditPersonComponent ],
  bootstrap: [ App ],
  providers:[ DataService, { provide: RouteReuseStrategy, useClass: CustomReuseStrategy}]
})
export class AppModule {}

import { Component } from '@angular/core';
import { DataService } from './data.service';

@Component({
  template:`
  <div class="panel panel-primary">
    <div class="panel-heading">
      Search Results
    </div>
    <table class="table table-primary">
      <thead>
        <tr>
          <th></th>
          <th>ID</th>
          <th>Name</th>
          <th>Surname</th>
          <th>Age</th>
        </tr>
      </thead>
      <tr *ngFor="let searchResult of searchResults">
        <td><a class="btn btn-success" [routerLink]="['../person', searchResult.id]">View</a></td>
        <td>{{searchResult.id}}</td>
        <td>{{searchResult.name}}</td>
        <td>{{searchResult.surname}}</td>
        <td>{{searchResult.age}}</td>
      </tr>
   </table>
  </div>`
})
export class SearchComponent {
  public searchResults: Array<SearchResultModel>;
  
  constructor(data:DataService) {
    this.searchResults = data.people;
  }
}

import { Component, OnInit, Input, Injectable } from '@angular/core';
import { ActivatedRoute } from '@angular/router';
import { DataService, SearchResultModel } from './data.service';

@Injectable()
export class PersonService {
  public selectedPerson: SearchResultModel;
}

@Component({
  template:`
   <div class="panel panel-default">
    <div class="panel-heading">Person- {{person.name}}</div>
    <div class="panel-body">
      <router-outlet></router-outlet>
    </div>
    <div class="panel-footer">
      <a class="btn btn-default"  [routerLink]="['../../search']">Back</a>
    </div>
  </div>
  `,
  providers:[PersonService]
})
export class PersonComponent implements OnInit {
  @Input
  public person:SearchResultModel;
  
  constructor(private route:ActivatedRoute, private data:DataService, private personService:PersonService) {
    
  }
  
  ngOnInit(){
    let id = this.route.params.value.id;
    this.personService.selectedPerson = this.data.people.filter(function(searchResult){
      return searchResult.id === id;
    })[0];
    this.person = this.personService.selectedPerson;
  }
}

@Component({
  template:`
    <div class="form-group">
      <label class="control-label">Name</label>:
      <label class="control-label">{{person.name}}</label>
    </div>
    <div class="form-group">
      <label class="control-label">Surname</label>
      <label class="control-label">{{person.surname}}</label>
    </div>
    <div class="form-group">
      <label class="control-label">Age</label>
      <label class="control-label">{{person.age}}</label>
    </div>
    <div>
      <a class="btn btn-success" [routerLink]="['../edit']">Edit</a>
    </div>
  `
})
export class ViewPersonComponent implements OnInit {
  @Input
  public person:SearchResultModel;
  
  constructor(private personService:PersonService) {
    
  }
  
  ngOnInit(){
    this.person = this.personService.selectedPerson;
  }
}


@Component({
  template:`
    <div class="form-group">
      <label class="control-label">Name</label>
      <input type="text" class="form-control" name="name" [ngModel]="person.name" />
    </div>
    <div class="form-group">
      <label class="control-label">Surname</label>
      <input type="text" class="form-control" name="name" [ngModel]="person.surname" />
    </div>
    <div class="form-group">
      <label class="control-label">Age</label>
      <input type="number" class="form-control" name="name" [ngModel]="person.age" />
    </div>
  `
})
export class EditPersonComponent implements OnInit {
  @Input
  public person:SearchResultModel;
  
  constructor(private personService:PersonService) {
    
  }
  
  ngOnInit(){
    this.person = this.personService.selectedPerson;
  }
}

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

export class SearchResultModel {
  constructor(public id:string, public name:string, public age:number, public surname:string){
    
  }
}

@Injectable()
export class DataService {
  public people:Array<SearchResultModel>;
  
  constructor(){
    this.people = new Array<SearchResultModel>();
    
    this.people.push(new SearchResultModel("12345", "John", 25, "Doe"));
    this.people.push(new SearchResultModel("12346", "Jane", 27, "Smith"));
    this.people.push(new SearchResultModel("12347", "Peter", 30, "Parker"))
  }
}

import {RouteReuseStrategy, DefaultUrlSerializer, ActivatedRouteSnapshot, DetachedRouteHandle} from "@angular/router";

export class CustomReuseStrategy implements RouteReuseStrategy {

    handlers: {[key: string]: DetachedRouteHandle} = {};

    calcKey(route: ActivatedRouteSnapshot) {
        let next = route;
        let url = "";
        while(next) {
            if (next.url) {
                url = next.url.join('/');
            }
            next = next.firstChild;
        }
        console.debug('url', url);
        return url;
    }

    shouldDetach(route: ActivatedRouteSnapshot): boolean {
      
        return true;
    }

    store(route: ActivatedRouteSnapshot, handle: DetachedRouteHandle): void {
      console.info('CustomReuseStrategy:store:' + this.calcKey(route));
        this.handlers[this.calcKey(route)] = handle;
        
    }

    shouldAttach(route: ActivatedRouteSnapshot): boolean {
        return !!route.routeConfig && !!this.handlers[this.calcKey(route)];
    }

    retrieve(route: ActivatedRouteSnapshot): DetachedRouteHandle {
        if (!route.routeConfig) return null;
        return this.handlers[this.calcKey(route)];
    }

    shouldReuseRoute(future: ActivatedRouteSnapshot, curr: ActivatedRouteSnapshot): boolean {
        
        return this.calcKey(curr) === this.calcKey(future);
    }

}