angular4 example

HTML

<script src="https://unpkg.com/[email protected]/client/shim.min.js"></script>
<script src="https://unpkg.com/[email protected]/dist/zone.min.js"></script>
<script src="https://unpkg.com/[email protected]/bundles/Rx.min.js"></script>
<script src="https://unpkg.com/@angular/[email protected]/bundles/core.umd.js"></script>
<script src="https://unpkg.com/@angular/[email protected]/bundles/common.umd.js"></script>
<script src="https://unpkg.com/@angular/[email protected]/bundles/compiler.umd.js"></script>
<script src="https://unpkg.com/@angular/[email protected]/bundles/platform-browser.umd.js"></script>
<script src="https://unpkg.com/@angular/[email protected]/bundles/platform-browser-dynamic.umd.js"></script>
<my-app></my-app>

TypeScript

let { Component, NgModule, ViewChild } = ng.core;

@Component({
  selector: 'my-app',
  template: `
  	<input type="text" #elem (keyup)="clearInput($event)">
  `,
})
class HomeComponent {
  	@ViewChild( 'elem' ) public element;
		clearInput( e: KeyboardEvent ) {
    debugger
    	if ( e.key === ',' ) {
  			this.element.nativeElement.value = '';
      } else {
      	console.log('Not a comma');
      }
    }
}

const { BrowserModule } = ng.platformBrowser;

@NgModule({
  imports:      [ BrowserModule ],
  declarations: [ HomeComponent ],
  bootstrap:    [ HomeComponent ]
})
class AppModule { }

const { platformBrowserDynamic } = ng.platformBrowserDynamic;
platformBrowserDynamic().bootstrapModule(AppModule);