Ionic 2.0.0-rc.2 - QuickStart Showing how to Use BehaviorSubject to Manage & Track Login State

import { Component } from '@angular/core';
import { HomePage } from './home.page';

@Component({
  template: `<ion-nav [root]="rootPage"></ion-nav>`
})
export class AppComponent {

  rootPage = HomePage;

}


/*
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
*/

import { NgModule } from '@angular/core';
import { IonicApp, IonicModule } from 'ionic-angular';

import { AppComponent } from './app.component';
import { HomePage } from './home.page';
import { Authentication } from './auth';

@NgModule({
  imports: [ IonicModule.forRoot(AppComponent) ],
  declarations: [ AppComponent, HomePage ],
  entryComponents: [ HomePage ],
  providers : [Authentication],
  bootstrap: [ IonicApp ]
})
export class AppModule { }


/*
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
*/

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

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

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


/*
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
*/

<!DOCTYPE html>
<html>
  <head>
    <title>Ionic 2 QuickStart</title>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">

    <!-- 1. Load libraries -->
     <!-- Polyfill(s) for older browsers -->
    <script src="https://unpkg.com/core-js@2.4.1/client/shim.min.js"></script>

    <script src="https://unpkg.com/zone.js@0.6.21?main=browser"></script>
    <script src="https://unpkg.com/systemjs@0.19.40/dist/system.src.js"></script>

    <!-- 2. Configure SystemJS -->
    <script src="systemjs.config.js"></script>
    <link href="https://unpkg.com/ionic-angular@2.0.0-rc.5/css/ionic.css" rel="stylesheet">
  </head>

  <!-- 3. Display the application -->
  <body>
    <ion-app></ion-app>
    <script>
      System.import('app').catch(function(err){ console.error(err); });
    </script>
  </body>
</html>


<!-- 
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
-->

### Ionic 2 Plunk

Basic Ionic 2 plunk based on the Angular QuickStart plunk.


See original question on Stackoverflow 

http://stackoverflow.com/questions/41656766/with-ionic-2-how-do-you-change-a-button-based-on-login-status-through-a-modal-th/41666132#41666132

#### Check Out Source Code On GitHub
https://github.com/aaronksaunders/Ionic2-Ionic.io-Auth-Example

#### Check Out Video On YouTube
https://www.youtube.com/watch?v=QicFdqDi6ns

/**
 * PLUNKER 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: {
      tsconfig: 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/core': 'npm:@angular/core@2.2.1/bundles/core.umd.js',
      '@angular/common': 'npm:@angular/common@2.2.1/bundles/common.umd.js',
      '@angular/compiler': 'npm:@angular/compiler@2.2.1/bundles/compiler.umd.js',
      '@angular/platform-browser': 'npm:@angular/platform-browser@2.2.1/bundles/platform-browser.umd.js',
      '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic@2.2.1/bundles/platform-browser-dynamic.umd.js',
      '@angular/http': 'npm:@angular/http@2.2.1/bundles/http.umd.js',
      '@angular/forms': 'npm:@angular/forms@2.2.1/bundles/forms.umd.js',
  
      'ionic-angular': 'npm:ionic-angular@2.0.0-rc.5',
      'rxjs': 'npm:rxjs@5.0.0-beta.12',
      'ts': 'npm:plugin-typescript@5.2.7/lib/plugin.js',
      'typescript': 'npm:typescript@2.0.7/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'
      },
      rxjs: {
        defaultExtension: 'js'
      },
      'ionic-angular': {
        main: './umd/index.js',
        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 } from '@angular/core';
import { NavController } from 'ionic-angular';
import { Authentication } from './auth';

@Component({
  selector: 'page-home',
  templateUrl: 'app/home.page.html'
})
export class HomePage {

  appName = 'Ionic App';
  currentUser

  constructor(public navController: NavController, public auth : Authentication) { 
    
    this.auth.activeUser.subscribe((_user)=>{
      this.currentUser = _user
    })
  }
  
  doLoginAction() {
    this.auth.doLogin();  
  }
  
  doLogoutAction() {
    this.auth.doLogout();
  }

}

<ion-header>
  <ion-navbar>
    <ion-title>{{ appName }}</ion-title>
  </ion-navbar>
</ion-header>

<ion-content padding>
  Welcome to this
  <ion-icon name="ionic"></ion-icon> <b>Ionic 2 app</b>
  <div>
    <button ion-button (click)="doLoginAction()" [disabled]="currentUser"> LOGIN </button>
    <button ion-button (click)="doLogoutAction()"  [disabled]="!currentUser"> LOGOUT </button>
  </div>
  <div>
    <p>
    LOGIN STATUS <span *ngIf="currentUser">{{currentUser | json}}</span>
    </p>
  </div>
  
    <a href="http://www.clearlyinnovative.com/user-authentication-with-ionic-cloud-auth-using-rxjsbehaviorsubject">
          Full application with source code and video available here...
    </a>
</ion-content>

import {Injectable} from '@angular/core'
import { BehaviorSubject } from 'rxjs/BehaviorSubject'

@Injectable()
export class Authentication {
  
  activeUser = new BehaviorSubject(null)
  
  constructor() {
    
  }
  
  doLogin() {
    this.activeUser.next({ username: 'aaron@mail.com'})
  }
  
  doLogout() {
     this.activeUser.next(null)   
  }
}