How to implement SignIn with Google in Angular 2 using Typescript

Question

I have been trying to implement sign in with Google in angular 2 in a separate login component. I am unable to implement it with the documentation available in Google https://developers.google.com/identity/sign-in/web/sign-in

Google sign in does work when I declare my script tags and google callback function inside my index.html file. But I require a separate component to be able to render the sign in with google button and receive the callback in it to further process the access token which is received for a user

Answer 1

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