Angular 2 + Typescript | select box FILTERING

<!DOCTYPE html>
<html>

  <head>
    <base href="." />
    <title>angular2 playground</title>
    <link rel="stylesheet" href="style.css" />
    <script src="https://unpkg.com/zone.js@0.6.24/dist/zone.js"></script>
    <script src="https://unpkg.com/zone.js@0.6.24/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 */
li {
  list-style: none;
  border-bottom: 1px solid #eee;
}

### Angular2 Starter Plunker - Typescript - RC.0

A simple plunker demonstrating Angular2 usage:
- Uses SystemJS + TypeScript to compile on the fly
- Includes binding, directives, http, pipes, and DI usage.

For opening

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, OnInit } from '@angular/core'
import { BrowserModule } from '@angular/platform-browser'
import { FormsModule } from '@angular/forms';
import { HttpModule } from '@angular/http';

//Pipes
import { MakeFilterPipe } from './make-filter.pipe';
import { ModelFilterPipe } from './model-filter.pipe';

// Data and Service
import { ICar } from './car';
import { AppService } from './app.service';

@Component({
  selector: 'my-app',
  template: `
  <select name="selectmake" [(ngModel)]="makeListFilter" (ngModelChange)="selectMake()">
    <option *ngFor="let muscleCar of muscleCars" [ngValue]="muscleCar">{{muscleCar.name}}</option>
  </select>

  <select name="selectmodel" [(ngModel)]="modelListFilter">
    <option *ngFor="let m of makeListFilter?.models" [ngValue]="m.model">{{m['model']}}</option>
  </select>
  
  <button class="btn btn-default" type="submit" (click)="searchCars()">FILTER</button>

  <ul>
    <li *ngFor="let _car of _cars | makeFilter:makeSearch | modelFilter:modelSearch">
        <h2>{{_car.id}} {{_car.carMake}} {{_car.carModel}}</h2>
    </li>
  </ul>`,
  providers: [ AppService ]
})
export class App implements OnInit {
  
  makeListFilter: Object[];
  modelListFilter: string = '';

  _cars: ICar[];
  
   constructor(private _appService: AppService) {
  }
  
  ngOnInit(): void {
    this._appService.getCars()
        .subscribe(_cars => this._cars = _cars);
  }
  
  selectMake() {
    if(this.modelListFilter) {
      this.modelListFilter = '';
    }
  }
  searchCars() {
    this.makeSearch = this.makeListFilter['name'];
    this.modelSearch = this.modelListFilter;
  }
  muscleCars = [
    {
      id: 1, name: "Chevrolet", models: [
        { model: "Camaro" },
        { model: "Corvette" }
      ]
    },
    {
      id: 2, name: "Dodge", models: [
        { model: "Challenger" },
        { model: "Charger" },
        { model: "Viper" }
      ]
    },
    {
      id: 3, name: "Ford", models: [
        { model: "GT" },
        { model: "Mustang" }
      ]
    }
  ];
}

@NgModule({
  imports: [ BrowserModule, FormsModule, HttpModule ],
  declarations: [ App, MakeFilterPipe, ModelFilterPipe ],
  bootstrap: [ App ]
})
export class AppModule {}

export class ICar {
    id: number;
    carMake: string;
    carModel: string;
}

import { Injectable } from '@angular/core';
import { Http } from '@angular/http';
import 'rxjs/add/operator/map'; 

import { ICar } from './car';

@Injectable()
export class AppService {
  
    constructor(private _http: Http) { }
    getCars() {
      return this._http.get('src/muscleCars.json')
                   .map(response => <ICar[]>response.json().muscleCarData);
    }
}

import { PipeTransform, Pipe } from '@angular/core';
import { ICar } from './car';

@Pipe({
    name: 'makeFilter'
})

export class MakeFilterPipe implements PipeTransform {
    transform(value: ICar[], filter: string): ICar[] {
        filter = filter ? filter.toLocaleLowerCase() : null;
        return filter ? value.filter((product: ICar) =>
            product.carMake.toLocaleLowerCase().indexOf(filter) !== -1) : value;
    }
}

import { PipeTransform, Pipe } from '@angular/core';
import { ICar } from './car';

@Pipe({
    name: 'modelFilter'
})

export class ModelFilterPipe implements PipeTransform {
    transform(value: ICar[], filter: string): ICar[] {
        filter = filter ? filter.toLocaleLowerCase() : null;
        return filter ? value.filter((product: ICar) =>
            product.carModel.toLocaleLowerCase().indexOf(filter) !== -1) : value;
    }
}

{ 
  "muscleCarData": [
    {
        "id": 1,
        "carMake": "Chevrolet",
        "carModel": "Camaro"
    },
    {
        "id": 2,
        "carMake": "Chevrolet",
        "carModel": "Corvette"
    },
    {
        "id": 3,
        "carMake": "Dodge",
        "carModel": "Challenger"
    },
    {
        "id": 4,
        "carMake": "Dodge",
        "carModel": "Charger"
    },
    {
        "id": 5,
        "carMake": "Dodge",
        "carModel": "Viper"
    },
    {
        "id": 6,
        "carMake": "Ford",
        "carModel": "GT"
    },
    {
        "id": 7,
        "carMake": "Ford",
        "carModel": "Mustang"
    }
  ]
}