How to implement SignIn with Google in Angular 2 using Typescript

Lexical scoping with an arrow (=>) function makes the use of let that = this; unnecessary.

A cleaner version of Pravesh's example, without the need for the that scoping work-around, would be:

Index.html

<script src="https://apis.google.com/js/platform.js" async defer></script>

Component.ts

declare const gapi: any;

@Component({
  selector: 'google-signin',
  template: '<button id="googleBtn">Google Sign-In</button>'
})
export class GoogleSigninComponent implements AfterViewInit {

  private clientId:string = 'YOUR_CLIENT_ID.apps.googleusercontent.com';

  private scope = [
    'profile',
    'email',
    'https://www.googleapis.com/auth/plus.me',
    'https://www.googleapis.com/auth/contacts.readonly',
    'https://www.googleapis.com/auth/admin.directory.user.readonly'
  ].join(' ');

  public auth2: any;

  public googleInit() {        
    gapi.load('auth2', () => {
      this.auth2 = gapi.auth2.init({
        client_id: this.clientId,
        cookiepolicy: 'single_host_origin',
        scope: this.scope
      });
      this.attachSignin(this.element.nativeElement.firstChild);
    });
  }

  public attachSignin(element) {
    this.auth2.attachClickHandler(element, {},
      (googleUser) => {
        let profile = googleUser.getBasicProfile();
        console.log('Token || ' + googleUser.getAuthResponse().id_token);
        console.log('ID: ' + profile.getId());
        // ...
      }, function (error) {
        console.log(JSON.stringify(error, undefined, 2));
      });
  }

  constructor(private element: ElementRef) {
    console.log('ElementRef: ', this.element);
  }

  ngAfterViewInit() {
    this.googleInit();
  }
}

Template

<div id="googleBtn">Google</div>

Working Plnkr


Add this line in your app index.html file

INDEX.html

<script src="https://apis.google.com/js/platform.js" async defer></script>

Component.ts file

declare const gapi: any;
  public auth2: any;
  public googleInit() {
    gapi.load('auth2', () => {
      this.auth2 = gapi.auth2.init({
        client_id: 'YOUR_CLIENT_ID.apps.googleusercontent.com',
        cookiepolicy: 'single_host_origin',
        scope: 'profile email'
      });
      this.attachSignin(document.getElementById('googleBtn'));
    });
  }
  public attachSignin(element) {
    this.auth2.attachClickHandler(element, {},
      (googleUser) => {

        let profile = googleUser.getBasicProfile();
        console.log('Token || ' + googleUser.getAuthResponse().id_token);
        console.log('ID: ' + profile.getId());
        console.log('Name: ' + profile.getName());
        console.log('Image URL: ' + profile.getImageUrl());
        console.log('Email: ' + profile.getEmail());
        //YOUR CODE HERE


      }, (error) => {
        alert(JSON.stringify(error, undefined, 2));
      });
  }

ngAfterViewInit(){
      this.googleInit();
}

Template html file

<button id="googleBtn">Google</button>

View the demo on Plunker


src/index.html

In the index.html file of your app you need to add this in the <head> section:

<meta name="google-signin-scope" content="profile email">
<meta name="google-signin-client_id" content="YOUR_CLIENT_ID.apps.googleusercontent.com">
<script src="https://apis.google.com/js/platform.js" async defer></script>

typings/browser/ambient/gapi/

You need to add gapi & gapi.auth2 to your typings:

npm install --save @types/gapi.auth2
npm install --save @types/gapi

(see this borysn's question to understand this a little better).

src/app/+login/login.component.ts

This is the file of my component, here you need to use the ngAfterViewInit() to use the gapi an get the auth. And you can follow the implementation here developers.google...sign-in/web/build-button

As an example, this is my template:

<div id="my-signin2"></div>

and sign in function:

ngAfterViewInit() {
    gapi.signin2.render('my-signin2', {
        'scope': 'profile email',
        'width': 240,
        'height': 50,
        'longtitle': true,
        'theme': 'light',
        'onsuccess': param => this.onSignIn(param)
    });
}

public onSignIn(googleUser) {
    var user : User = new User();

    ((u, p) => {
        u.id            = p.getId();
        u.name          = p.getName();
        u.email         = p.getEmail();
        u.imageUrl      = p.getImageUrl();
        u.givenName     = p.getGivenName();
        u.familyName    = p.getFamilyName();
    })(user, googleUser.getBasicProfile());

    ((u, r) => {
        u.token         = r.id_token;
    })(user, googleUser.getAuthResponse());

    user.save();
    this.goHome();
};

UPDATE: After some time, and taking in consideration the comments, this answer needed a small update.


There is also another way to connect with google :

Add theses lines in the index.html :

<meta name="google-signin-client_id" content="YOUR-GOOGLE-APP-ID.apps.googleusercontent.com">
<script src="https://apis.google.com/js/platform.js"></script>

and then here is a sample code to write on a component (or a service if you want) :

import {Component} from "@angular/core";
declare const gapi : any;


@Component({ ... })
export class ComponentClass {
   constructor() {
      gapi.load('auth2', function () {
         gapi.auth2.init()
      });
   }

   googleLogin() {
      let googleAuth = gapi.auth2.getAuthInstance();
      googleAuth.then(() => {
         googleAuth.signIn({scope: 'profile email'}).then(googleUser => {
            console.log(googleUser.getBasicProfile());
         });
      });
   }
}

Tags:

Typescript

Google Signin

Angular

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