Angular 4 TypeScript Google Account Email Login and Routing
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Thursday, September 07, 2017

Angular 4 TypeScript Google Account Email Login and Routing

A few days back, I read an article about Google Authentication. A bug was mentioned in the article, that Google login status can be easily accessed by calling out some images. After reading the article, I got an idea that why don't we use this bug in a positive approach to validate user authentication. This same idea has been implemented in this post to do email validation. I have used Google email login system (not OAuth) using Angular 4 CLI project. Take a look at the live demo ( Make sure to login into your Google account in another tab to do this validation).

Angular 4 TypeScript Google Account Email Login

Live Demo

Part 1
Ionic 3 and Angular 4: Create a Welcome Page with Login and Logout.

Video Tutorial
Angular 4 TypeScript Google Account Email Login

Install Angular Command-line

Open your terminal or command prompt and execute the following command, this will install AngularCli globally. Before that you must setup your machine with latest Node.js software.
$ sudo npm install angular-cli -g

Create and Launch a Angular2 Project
Here ng new command will take care the project files. Use ng serve command to launch the application.
ng new angularFirebaseProject

cd angularFirebaseProject

ng serve

Project Launch
Angular Cli project default port is 4200. Open your browser and launch the URL http://localhost:4200

Get Started

This project requires login and home pages. Login page contains email input and Home page for displaying user details line name, email etc.

Generate Login Component
ng generating command will help you to create login component files, this will update app.module.ts all of the dependencies.
ng generate component login-page

installing component
  create src/app/login-page/login-page.component.css
  create src/app/login-page/login-page.component.html
  create src/app/login-page/login-page.component.spec.ts
  create src/app/login-page/login-page.component.ts
  update src/app/app.module.ts

Generate Home Component
$ ng generate component home-page

You will find all of the generated files in src folder.
Create Angular Cli Components

Create Auth Service
Injectable component this contains a postData function for connecting your PHP rest APIs
$ng generate service auth

Create a folder services folder and move newly created auth service files.

import { Injectable } from '@angular/core';
import {Http, Headers} from '@angular/http';
import 'rxjs/add/operator/map';
let apiUrl = "http://localhost/PHP-Slim-Restful/api/";
export class AuthService {

  constructor(public http : Http) {
    console.log('Hello AuthService Provider');

  postData(credentials, type) {
    return new Promise((resolve, reject) => {
      let headers = new Headers(); + type, JSON.stringify(credentials), {headers: headers})
        .subscribe(res => {
        }, (err) => {




Include all of your newly created components, watch the video you will understand more. Here implemented Routing for Login and Home pages.
import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { HttpModule} from '@angular/http';
import { FormsModule } from '@angular/forms';
import { AppComponent } from './app.component';
import { LoginComponent } from './login/login.component';
import { HomeComponent } from './home/home.component';
import { RouterModule, Routes } from '@angular/router';
import { AuthService } from './services/auth.service';

const routes: Routes = [
  { path: 'home', component: HomeComponent },
  { path: '', component: LoginComponent }

  declarations: [
  imports: [
    BrowserModule,HttpModule, RouterModule.forRoot(routes), FormsModule
  providers: [AuthService],
  bootstrap: [AppComponent]
export class AppModule { }

Modify mail app component for routing.
    Welcome to Sign In with Google Email!

Create a simple form with email input and submit button.
<form action="#">
  <input type="email"  class="input" [(ngModel)]="userEmail" required name="email"/>
  <input type="submit" class="submit" (click)="emailValidate()" />

Here emailValidation() function to get the use email input and append with Google image URL.
import { Component, OnInit } from '@angular/core';
import {AuthService} from '../services/auth.service';
import {Router} from '@angular/router';
  selector: 'app-login',
  templateUrl: './login.component.html',
  styleUrls: ['./login.component.css']
export class LoginComponent implements OnInit {

  public userEmail: string;
  public googleUrl: any;
  public errorMsg: string;
  public responseData: any;
  public userPostData = {
    'email': ''

  constructor(private authService: AuthService, private router: Router) { }

  ngOnInit() {
    this.errorMsg = '';
    this.googleUrl = '';

  validateEmail(email) {
    var re = /^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
    return re.test(email);

  emailValidate() {
    if (this.validateEmail(this.userEmail)) { = this.userEmail;
      this.googleUrl = '' +this.userEmail+'&';

    } else {}



Now bind img tag with googleUrl value. Here (load) works for success and (error) for use not loggin.
//Form Code
<div *ngIf="googleUrl">
  <img [src]="googleUrl"  (load)="googleUrlSuccess($event)" (error)="googleUrlError($event)"/>

googleUrlError(event) {
   this.errorMsg = 'Open new tab and login with your google account.';

Include following function for login. If email login success, it will store the API response in localStorage and redirect to home page.
googleUrlSuccess(event) {
if ( {
   this.errorMsg = '';
   this.authService.postData(this.userPostData, 'email')
   .then((result) => {
   this.responseData = result;
   if (this.responseData.userData) {
     localStorage.setItem('userData', JSON.stringify(this.responseData));
     // Redirect
   }, (err) => {
    //Connection failed message

Getting the user localstorage data and parse it. If data is not present redirect to login page.
import {Component, OnInit} from '@angular/core';
import {Router} from '@angular/router';

selector: 'app-home',
templateUrl: './home.component.html',
styleUrls: ['./home.component.css']

export class HomeComponent implements OnInit {
  public userData : any;
  constructor(private router: Router) {
    if (localStorage.getItem('userData')) {
      this.userData = localStorage.getItem('userData');
    } else {


  ngOnInit() {}

  logout() {
    localStorage.setItem('userData', '');


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  1. Thank you so much for sharing this information.

    I love the way you share

    I am your fan

  2. I started working on ionic and this tutorial is great to me.

  3. Very supportive article its help me

  4. Thanks srinivas for the angular4 typescript. here i made list of 10 articles and want to add your article in my list if you will give permission. have a look, Angular 4 Authentication Login example

  5. i have same problem please help me out 4 that

  6. Getting below error at line
    <img [src]="googleUrl" (load)="googleUrlSuccess($event)"
    Cross-Origin Read Blocking (CORB) blocked cross-origin response


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