ngModelChange Example

<!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>
    <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.module';

platformBrowserDynamic().bootstrapModule(AppModule)

import {NgModule} from '@angular/core'
import {BrowserModule} from '@angular/platform-browser'
import {FormsModule} from "@angular/forms"
import {AppComponent} from './app.component'
import {TemplateDrivenForm} from './template-driven-form'

@NgModule({
  imports: [ BrowserModule, FormsModule ],
  declarations: [ AppComponent, TemplateDrivenForm ],
  bootstrap: [ AppComponent ]
})
export class AppModule {}

import {Component} from '@angular/core';
import {TemplateDrivenForm} from './template-driven-form';

@Component({
  selector: 'my-app',
  template: '<template-driven-form></template-driven-form>'
})
export class AppComponent { }

<section>
  <h1>Template-driven Form Example:</h1>
  <form #f="ngForm" (ngSubmit)="onSubmitTemplateBased()">
  <p>
    <label>First Name:</label>
    <input type="text"  
      [(ngModel)]="user.firstName"
      name="firstName" required>
      {{fn}}
  </p>
  <p>
    <label>Password:</label>
    <input type="password"  
      [(ngModel)]="user.password"
      name="password"
      required>
  </p>
  <p>
    <button type="submit" [disabled]="!f.valid">Submit</button>
  </p>
  </form>
</section>

import {Component} from '@angular/core'
import {FormsModule} from '@angular/forms'

@Component({
    selector: 'template-driven-form',
    template: `
    <section>
      <h1>(ngModelChange) Example:</h1>
      <form #f="ngForm" (ngSubmit)="onSubmitTemplateBased()">
      <p>
        <label>Number:</label>
        <input type="number"  
          [(ngModel)]="expiration"
          (ngModelChange)="onChange($event)"
          expiration="expiration"
          required>
      </p>
      </form>
    </section>
    `
})

export class TemplateDrivenForm {

    expiration: string = '';

    onChange(event) {
      if (this.expiration) {
        let expiration = this.expiration.toString();
        expiration = expiration.replace(/[^0-9\\]/g, '');
        if (expiration.length > 2) {
          expiration += '\\';
        }
        this.expiration = expiration;
      } else {
        this.expiration = '';
      }
    }
}