Angular 2+ Custom Form Input

<!DOCTYPE html>
<html>

  <head>
    <title>Angular 2+ Custom Form Controls</title>
    <script src="https://unpkg.com/core-js/client/shim.min.js"></script>
    <script src="https://unpkg.com/zone.js@0.7.4?main=browser"></script>
    <script src="https://unpkg.com/systemjs@0.19.39/dist/system.src.js"></script>
    <script src="systemjs.config.js"></script>
    <script>
      System.import('app').catch(function(err){ console.error(err); });
    </script>
    <style>
      body {
        font-family: "HelveticaNeue-Light", "Helvetica Neue Light", "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; 
        font-weight: 300;
      }
    </style>
  </head>

  <body>
    <app-root>Loading...</app-root>
  </body>
</html>

import { Component } from '@angular/core';
import { FormGroup, FormBuilder } from '@angular/forms';

@Component({
  selector: 'app-root',
  templateUrl: 'app/app.component.html'
})
export class AppComponent {
  myForm: FormGroup
  value = false;
  
  constructor(private formBuilder: FormBuilder) { }
  
  ngOnInit() {
    this.myForm = this.formBuilder.group({
      mySwitch: [true]
    });
  }
  
  submit() {
    alert(`Value: ${this.myForm.controls.mySwitch.value}`);
    console.log(`Value: ${this.myForm.controls.mySwitch.value}`);
  }
}

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { FormsModule, ReactiveFormsModule } from '@angular/forms';
import { RouterModule } from '@angular/router';

import { AppComponent } from './app.component';
import { SwitchComponent } from './switch.component';

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

<h1>Angular Custom Form Control</h1>
<br />

<h3>NgModel</h3>
<app-switch [(ngModel)]="value" [label]="'My Switch'"></app-switch><br />
<strong>Value:</strong> {{value}}

<br /><br />
<hr />
<br />

<h3>Reactive Forms</h3>
<form [formGroup]="myForm" (ngSubmit)="submit()">
  <app-switch formControlName="mySwitch" [label]="'My Switch'"></app-switch>
  <button>Submit</button>
</form>

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

import { AppModule } from './app.module';

const platform = platformBrowserDynamic();
platform.bootstrapModule(AppModule);

/**
 * WEB ANGULAR VERSION
 * (based on systemjs.config.js in angular.io)
 * System configuration for Angular samples
 * Adjust as necessary for your application needs.
 */
(function (global) {
  System.config({
    // DEMO ONLY! REAL CODE SHOULD NOT TRANSPILE IN THE BROWSER
    transpiler: 'ts',
    typescriptOptions: {
      // Copy of compiler options in standard tsconfig.json
      "target": "es5",
      "module": "commonjs",
      "moduleResolution": "node",
      "sourceMap": true,
      "emitDecoratorMetadata": true,
      "experimentalDecorators": true,
      "lib": ["es2015", "dom"],
      "noImplicitAny": true,
      "suppressImplicitAnyIndexErrors": true
    },
    meta: {
      'typescript': {
        "exports": "ts"
      }
    },
    paths: {
      // paths serve as alias
      'npm:': 'https://unpkg.com/'
    },
    // map tells the System loader where to look for things
    map: {
      // our app is within the app folder
      'app': 'app',

      // angular bundles
      '@angular/animations': 'npm:@angular/animations/bundles/animations.umd.js',
      '@angular/animations/browser': 'npm:@angular/animations/bundles/animations-browser.umd.js',
      '@angular/core': 'npm:@angular/core/bundles/core.umd.js',
      '@angular/common': 'npm:@angular/common/bundles/common.umd.js',
      '@angular/common/http': 'npm:@angular/common/bundles/common-http.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/animations': 'npm:@angular/platform-browser/bundles/platform-browser-animations.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/router/upgrade': 'npm:@angular/router/bundles/router-upgrade.umd.js',
      '@angular/forms': 'npm:@angular/forms/bundles/forms.umd.js',
      '@angular/upgrade': 'npm:@angular/upgrade/bundles/upgrade.umd.js',
      '@angular/upgrade/static': 'npm:@angular/upgrade/bundles/upgrade-static.umd.js',

      // other libraries
      'rxjs':                      'npm:rxjs@5.5.2',
      'rxjs/operators':            'npm:rxjs@5.5.2/operators/index.js',
      'tslib':                     'npm:tslib/tslib.js',
      'angular-in-memory-web-api': 'npm:angular-in-memory-web-api@0.4/bundles/in-memory-web-api.umd.js',
      'ts':                        'npm:plugin-typescript@5.2.7/lib/plugin.js',
      'typescript':                'npm:typescript@2.4.2/lib/typescript.js',

    },
    // packages tells the System loader how to load when no filename and/or no extension
    packages: {
      app: {
        main: './main.ts',
        defaultExtension: 'ts',
        meta: {
          './*.ts': {
            loader: 'systemjs-angular-loader.js'
          }
        }
      },
      rxjs: {
        defaultExtension: 'js'
      }
    }
  });

})(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 { Component, Input, forwardRef } from '@angular/core';
import { ControlValueAccessor, NG_VALUE_ACCESSOR } from '@angular/forms';

@Component({
  selector: 'app-switch',
  templateUrl: 'app/switch.component.html',
  styleUrls: ['app/switch.component.css'],
  providers: [
    {
      provide: NG_VALUE_ACCESSOR,
      useExisting: forwardRef(() => SwitchComponent),
      multi: true
    }
  ]
})
export class SwitchComponent implements ControlValueAccessor {
  @Input() label = 'switch';
  @Input('value') _value = false;
  onChange: any = () => { };
  onTouched: any = () => { };
  
  get value() {
    return this._value;
  }

  set value(val) {
    this._value = val;
    this.onChange(val);
    this.onTouched();
  }

  constructor() { }

  registerOnChange(fn) {
    this.onChange = fn;
  }

  writeValue(value) {
    console.log(value);
    if (value) {
      this.value = value;
    }
  }

  registerOnTouched(fn) { 
    this.onTouched = fn;
  }

  switch() {
    this.value = !this.value;
  }
}

<div (click)="switch()" class="switch" [ngClass]="{ 'checked': value }" [attr.title]="label">
  <input type="checkbox" class="switch-input" [value]="value" [attr.checked]="value" [attr.aria-label]="label">
  <span class="switch-label" data-on="On" data-off="Off"></span>
  <span class="switch-handle"></span>
</div>

.switch {
  position: relative;
  display: inline-block;
  vertical-align: top;
  width: 80px;
  height: 30px;
  padding: 3px;
  background-color: none;
  cursor: pointer;
  overflow: visible;
}

.switch-input {
  position: absolute;
  top: 0;
  left: 0;
  opacity: 0;
}

.switch-label {
  position: relative;
  display: block;
  height: inherit;
  font-size: 16px;
  font-weight: normal;
  text-transform: uppercase;
  background: #ccc;
  border-radius: 4px;
  transition: 0.15s ease-out;
  transition-property: opacity background;
  color: #2d2d2d;
}

.switch-label::before, .switch-label::after {
  position: absolute;
  top: 50%;
  margin-top: -.5em;
  line-height: 1;
  transition: inherit;
}

.switch-label::before {
  content: attr(data-off);
  right: 11px;
  color: #fff;
}

.switch-label::after {
  content: attr(data-on);
  left: 11px;
  color: #fff;
  opacity: 0;
}

.switch-handle {
  position: absolute;
  top: 9px;
  left: 12px;
  width: 18px;
  height: 18px;
  background: #fff;
  border-radius: 10px;
  box-shadow: 1px 1px 5px #2d2d2d;
  transition: left 0.15s ease-out;
}

.checked .switch-label {
  background: #4CAF50;
  box-shadow: inset 0 1px 2px rgba(255, 255, 255, 0.5), inset 0 0 3px rgba(0, 0, 0, 0.15);
}

.checked .switch-label::before {
  opacity: 0;
}

.checked .switch-label::after {
  opacity: 1;
}

.checked .switch-handle {
  left: 50px;
  box-shadow: -1px 1px 5px rgba(45, 45, 45, 0.41);
}

var templateUrlRegex = /templateUrl\s*:(\s*['"`](.*?)['"`]\s*)/gm;
var stylesRegex = /styleUrls *:(\s*\[[^\]]*?\])/g;
var stringRegex = /(['`"])((?:[^\\]\\\1|.)*?)\1/g;

module.exports.translate = function(load){
  if (load.source.indexOf('moduleId') != -1) return load;

  var url = document.createElement('a');
  url.href = load.address;

  var basePathParts = url.pathname.split('/');

  basePathParts.pop();
  var basePath = basePathParts.join('/');

  var baseHref = document.createElement('a');
  baseHref.href = this.baseURL;
  baseHref = baseHref.pathname;

  if (!baseHref.startsWith('/base/')) { // it is not karma
    basePath = basePath.replace(baseHref, '');
  }

  load.source = load.source
    .replace(templateUrlRegex, function(match, quote, url){
      var resolvedUrl = url;

      if (url.startsWith('.')) {
        resolvedUrl = basePath + url.substr(1);
      }

      return 'templateUrl: "' + resolvedUrl + '"';
    })
    .replace(stylesRegex, function(match, relativeUrls) {
      var urls = [];

      while ((match = stringRegex.exec(relativeUrls)) !== null) {
        if (match[2].startsWith('.')) {
          urls.push('"' + basePath + match[2].substr(1) + '"');
        } else {
          urls.push('"' + match[2] + '"');
        }
      }

      return "styleUrls: [" + urls.join(', ') + "]";
    });

  return load;
};