import { Component } from "@angular/core";

@Component({
  selector: 'app-root',
  template: `
    <h1>My Angular 2 App</h1>
    <app-number></app-number>
  `
})
export class AppComponent {}
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';

import { AppComponent } from './app.component';
import { FormsModule } from '@angular/forms';

import { NumberMaskPipe } from './number-mask.pipe';
import { PhoneNumberComponent } from './phone-number.component';

@NgModule({
  imports: [BrowserModule,FormsModule],
  providers: [],
  declarations: [
    AppComponent,
    NumberMaskPipe,
    PhoneNumberComponent
  ],
  bootstrap: [AppComponent]
})
export class AppModule {}
<!DOCTYPE html>
<html>
  <head>
    <script>document.write('<base href="' + document.location + '" />');</script>
    <title>NgModule Deluxe</title>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <script src="https://npmcdn.com/core-js/client/shim.min.js"></script>
    <script src="https://npmcdn.com/zone.js@0.6.25?main=browser"></script>
    <script src="https://npmcdn.com/reflect-metadata@0.1.3"></script>
    <script src="https://npmcdn.com/systemjs@0.19.27/dist/system.src.js"></script>
    <script src="systemjs.config.js"></script>
    <script>
      System.import('main.ts').catch(function(err){ console.error(err); });
    </script>
  </head>

  <body>
    <app-root>Loading...</app-root>
  </body>
</html>
/**
 * PLUNKER VERSION (based on systemjs.config.js in angular.io)
 * System configuration for Angular 2 samples
 * Adjust as necessary for your application needs.
 */
(function(global) {

  var ngVer = '@2.3.0'; // lock in the angular package version; do not let it float to current!
  var routerVer = '@3.3.0'; // lock router version
  var formsVer = '@2.3.0'; // lock forms version
  var routerDeprecatedVer = '@2.0.0-rc.2'; // temporarily until we update all the guides

  //map tells the System loader where to look for things
  var map = {
    'app':                        'app',

    '@angular':                   'https://npmcdn.com/@angular', // sufficient if we didn't pin the version
    '@angular/router':            'https://npmcdn.com/@angular/router' + routerVer,
    '@angular/forms':             'https://npmcdn.com/@angular/forms' + formsVer,
    '@angular/router-deprecated': 'https://npmcdn.com/@angular/router-deprecated' + routerDeprecatedVer,
    'angular2-in-memory-web-api': 'https://npmcdn.com/angular2-in-memory-web-api', // get latest
    'rxjs':                       'https://npmcdn.com/rxjs@5.0.0-beta.12',
    'ts':                         'https://npmcdn.com/plugin-typescript@4.0.10/lib/plugin.js',
    'typescript':                 'https://npmcdn.com/typescript@2.0.2/lib/typescript.js',
 };

  //packages tells the System loader how to load when no filename and/or no extension
  var packages = {
    'app':                        { main: 'main.ts',  defaultExtension: 'ts' },
    'rxjs':                       { defaultExtension: 'js' },
    'angular2-in-memory-web-api': { main: 'index.js', defaultExtension: 'js' },
  };

  var ngPackageNames = [
    'common',
    'compiler',
    'core',
    'http',
    'platform-browser',
    'platform-browser-dynamic',
    'upgrade',
  ];

  // Add map entries for each angular package
  // only because we're pinning the version with `ngVer`.
  ngPackageNames.forEach(function(pkgName) {
    map['@angular/'+pkgName] = 'https://npmcdn.com/@angular/' + pkgName + ngVer;
  });

  // Add package entries for angular packages
  ngPackageNames.concat(['forms', 'router', 'router-deprecated']).forEach(function(pkgName) {

    // Bundled (~40 requests):
    packages['@angular/'+pkgName] = { main: '/bundles/' + pkgName + '.umd.js', defaultExtension: 'js' };

    // Individual files (~300 requests):
    //packages['@angular/'+pkgName] = { main: 'index.js', defaultExtension: 'js' };
  });

  var config = {
    // DEMO ONLY! REAL CODE SHOULD NOT TRANSPILE IN THE BROWSER
    transpiler: 'ts',
    typescriptOptions: {
      tsconfig: true
    },
    meta: {
      'typescript': {
        "exports": "ts"
      }
    },
    map: map,
    packages: packages
  };

  System.config(config);

})(this);


/*
Copyright 2016 Google Inc. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at http://angular.io/license
*/
{
  "compilerOptions": {
    "target": "es5",
    "module": "commonjs",
    "moduleResolution": "node",
    "sourceMap": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "removeComments": false,
    "noImplicitAny": true,
    "suppressImplicitAnyIndexErrors": true
  }
}
import { Pipe, PipeTransform } from '@angular/core';

@Pipe({
  name: 'mask'
})
export class NumberMaskPipe implements PipeTransform {
  transform(phoneNumber: string): string {
    const visibleDigits = 4;
    let maskedSection = phoneNumber.slice(0, -visibleDigits);
    let visibleSection = phoneNumber.slice(-visibleDigits);
    return maskedSection.replace(/./g, '*') + visibleSection;
  }
}
import { Component, OnInit, ViewChild, ElementRef } from '@angular/core';

@Component({
    selector: 'app-number',
    template: `

   <input type="text" #phoneNumberText name="phoneNumber" id="phoneNumber" [ngModel]="phoneNumberUI" (keyup)="newmethod($event)"/>
    <p>Your phone number is: {{ phoneNumberUI  }}</p>
    <p>Your original Number is {{phoneNumber}}</p>

  `
})
export class PhoneNumberComponent implements OnInit {
    phoneNumberUI: string;
    phoneNumber: string;
    maskedSection: any;
    visibleSection: any;
    maskedSectionOriginal: string = "";
    previouslength: number = 0;
    @ViewChild('phoneNumberText') private phoneNumberValue: ElementRef;
    constructor() { }

    ngOnInit() {
    }
    newmethod(event) {
        if (event.code == "Backspace" || event.code == "Delete") {
            this.clearData();
        }
        else {
          var temp=JSON.parse(JSON.stringify(this.phoneNumberValue.nativeElement.value));
          temp=  temp.replace(/\*/g, '');
          console.log(temp);
          console.log(this.phoneNumberValue.nativeElement.value);
          if(!isNaN(temp))
            this.maskData(this.phoneNumberValue.nativeElement.value)
            else
            this.clearData();
        }
    }
    maskData(event) {
        if (event.length > 4) {
            let visibleDigitstemp = 4 - event.length;
            let maskedSectiontemp = event.slice(0, -visibleDigitstemp);

            if (maskedSectiontemp)
                maskedSectiontemp = maskedSectiontemp.replace(/\*/g, '');

            if (maskedSectiontemp.length > 0) {
                this.maskedSectionOriginal = this.maskedSectionOriginal + JSON.parse(JSON.stringify(maskedSectiontemp));
            }
        }

        const visibleDigits = 4;
        this.maskedSection = event.slice(0, -visibleDigits);

        this.visibleSection = event.slice(-visibleDigits);
        this.phoneNumberUI = this.maskedSection.replace(/./g, '*') + this.visibleSection;

        this.phoneNumber = this.maskedSectionOriginal + this.visibleSection;
    }
    clearData() {
        this.maskedSection = "";
        this.visibleSection = "";
        this.phoneNumberUI = "";
        this.phoneNumber = "";
        this.maskedSectionOriginal="";
    }
}
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { AppModule } from './app/app.module';
import { enableProdMode } from '@angular/core';
enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);