Angular2 + Dynamic aplication & widgets Multiples root applications

<!DOCTYPE html>
<html>

  <head>
    <base href="." />
    <title>angular2 playground</title>
    <link rel="stylesheet" href="style.css" />
    <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>
  </body>

</html>

body {
  display: flex;
  flex-wrap: wrap;
  flex-direction:row;
  justify-content: space-around;
}

### Angular2: Multiples and dynamic applications using widgets

A common question: How to create multiples applications in a dynamic and programatic way?

Here is a proposal of how can be acoplished using applications factories.

Pull Requests are welcomes!

Repo: https://github.com/mrsoto/angular2DimanicWidgets

Licence: MIT

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 {Provider} from '@angular/core'
import {platformBrowserDynamic} from '@angular/platform-browser-dynamic'

import {ApplicationIdToken, WidgetToken} from './constants'
import {applicationFactory} from './app'
import {EvenModule} from './even.component'
import {OddModule} from './odd.component'

const body = document.body
const widgets = [EvenModule, OddModule]
for ( let i=1; i<10; i++) {
  
  const selector = `my-app-${i}`
  const textnode = document.createTextNode('loading...')
  const placeHolder = document.createElement(selector)
  placeHolder.appendChild(textnode)
  body.appendChild(placeHolder)
  

  const ngModule = widgets[i % widgets.length]
  const providers : Provider[] = [
    { provide: 'timestamp', useValue: new Date()},
    { provide: WidgetToken, useClass: ngModule}
    ]
  const AppModule = applicationFactory({selector, ngModule})
  platformBrowserDynamic(providers).bootstrapModule(AppModule)
}

import {
  Component,
  NgModule,
  Inject,
  Type,
  Provider,
} from '@angular/core'
import {BrowserModule} from '@angular/platform-browser'
import {ApplicationIdToken, WidgetToken} from './constants'

type ApplicationDescriptor = {
  selector: string,
  ngModule: Type<any>,
  providers?: Provider[],
  }

export const applicationFactory = function applicationFactory({
  selector,
  ngModule,
  } : ApplicationDescriptor) {

  @Component({
    selector,
    template: `
        <header>It Works!</header>
        <widget></widget>
        <footer>created @{{createTS|date:mediumTime}}</footer>
    `,
    styles:[ 
      `
:host {
  border: 1px solid;
  background-color: cyan;
  margin: 5px;
  padding: 5px;
  border-radius: 3px;
  display: flex;
  flex-direction:column;
}
footer {
  font-size:xx-small;
  align-self: flex-end;
}
widget {
  display:block;
  margin: 5px;
  background-color: darkcyan;
  color: white;
  border: 1px solid darkblue;
  border-radius:4px;
  padding: 0.3em;
}
        `
        ]
  })
  class App {
    constructor(
      @Inject('timestamp') private createTS : Date,
      ) {}      
  }

  @NgModule({
    imports: [ BrowserModule, ngModule ],
    declarations: [ App ],
    bootstrap: [ App ],
    providers: [
       { provide: ApplicationIdToken, useValue: selector}
    ]
  })
  class AppModule {}

  return AppModule

}

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

import {ApplicationId} from './applicationid.component'

@Component({
  selector: 'widget',
  template: `
      <h4>Odd</h4>
      <p>From app: <application-id></application-id></p>
  `,
  styles: [ `h4 {  font-size:10px; } p {  font-size: 8px; }`]
  })
export class Odd  {}

@NgModule({
  exports: [Odd],
  declarations: [ Odd, ApplicationId ],
})
export class OddModule {}

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

import {ApplicationId} from './applicationid.component'

@Component({
  selector: 'widget',
  template: `
      <h4>Even</h4>
      <p>From app: <application-id></application-id></p>
  `,
  styles: [ `h4 { font-size:10px; text-align:right; } p { font-size: 8px; }`]
  })
export class Even  {}

@NgModule({
  exports: [Even],
  declarations: [Even, ApplicationId],
})
export class EvenModule {}

import {OpaqueToken} from '@angular/core'

export const ApplicationIdToken = new OpaqueToken('application-id')
export const WidgetToken = new OpaqueToken('widget')

import {
  Component,
  NgModule,
  Inject
} from '@angular/core'

import {ApplicationIdToken} from './constants'

@Component({
  selector: 'application-id',
  template: `<span>{{applicationId}}<span>`,
  styles: [ `
span {
  font-family: monospace;
}
`
        ]
  })
export class ApplicationId  {
  constructor(
    @Inject(ApplicationIdToken) private applicationId : string
    ) {}
}