Using google sign in button with react

Question

I'm trying to use the google sign in in a react application. While using the sign in button as is outside the application itself works great, when using it within a custom SignIn component I can't get it to work as expected. When the user signs in, the button itself should execute a data-onsuccess method. The problem is that the execution never reaches that method even though the sign in works.

I'm probably missing some react gotcha but I can't really find it. Any help? Find below the html that loads everything and the component itself.

<head>
    <meta name="google-signin-scope" content="profile email">
    <meta name="google-signin-client_id" content="1234-real-client-id.apps.googleusercontent.com">
    <script src="https://apis.google.com/js/platform.js" async defer></script>
</head>
<body>
    <!-- Here is where everything gets displayed -->
    <div id="app"></div>

    <!-- The file with the js code -->
    <script src="/js/main.js"></script>
</body>


var SignIn = React.createClass({
    onSignIn : function (google_user) {
        // I want this method to be executed
    },

    render : function() {
        return (
            <div className="g-signin2" data-onsuccess={this.onSignIn} data-theme="dark" />
        );
    }
});

Notice that I didn't paste here irrelevant code ;)

Answer 1

Try adding the onSuccess callback when you initialize the component in componentDidMount().

componentDidMount: function() {
  gapi.signin2.render('g-signin2', {
    'scope': 'https://www.googleapis.com/auth/plus.login',
    'width': 200,
    'height': 50,
    'longtitle': true,
    'theme': 'dark',
    'onsuccess': this. onSignIn
  });  
},
...

Sources: https://developers.google.com/identity/sign-in/web/build-button, https://github.com/meta-meta/webapp-template/blob/6d3e9c86f5c274656ef799263c84a228bfbe1725/app/Application/signIn.jsx.

Answer 2

I needed to use this in a functional component so thought I would share how I adapted it, I needed to use the useEffectHook which can be used in place of componentDidMount

  useEffect(() => {
    window.gapi.signin2.render('g-signin2', {
      'scope': 'https://www.googleapis.com/auth/plus.login',
      'width': 200,
      'height': 50,
      'longtitle': true,
      'theme': 'dark',
      'onsuccess': onSignIn
    })
  })

Answer 3

Now you can use this React Google Login NPM package that encapsulates all the setup work. You can just pass options to the component only.

import React from 'react';
import ReactDOM from 'react-dom';
import GoogleLogin from 'react-google-login';
// or
import { GoogleLogin } from 'react-google-login';
 
 
const responseGoogle = (response) => {
  console.log(response);
}
 
ReactDOM.render(
  <GoogleLogin
    clientId="658977310896-knrl3gka66fldh83dao2rhgbblmd4un9.apps.googleusercontent.com"
    buttonText="Login"
    onSuccess={responseGoogle}
    onFailure={responseGoogle}
    cookiePolicy={'single_host_origin'}
  />,
  document.getElementById('googleButton')
);

The code is from the package's documentation.

Answer 4

Might be alittle late but I want to share my go to implementation. As in my case I want to fully customize the button, and also want to have some sort of loader. I reimplemented this using hooks

/* istanbul ignore file */
import { useState, useEffect, useCallback } from 'react';
import { APP_IDS } from 'utils/constants';

const initgAuth = () =>
  // eslint-disable-next-line no-unused-vars
  new Promise((resolve, _reject) => {
    // eslint-disable-next-line no-undef
    gapi.load('auth2', () => {
      // eslint-disable-next-line no-undef
      const auth = gapi.auth2.init({
        client_id: APP_IDS.Google,
      });
      resolve(auth);
    });
  });

const initializeGoogle = () =>
  // eslint-disable-next-line no-unused-vars
  new Promise((resolve, _reject) => {
    if (typeof gapi !== 'undefined') {
      window.googleAsyncInit().then(auth => {
        resolve(auth);
      });
    } else {
      // eslint-disable-next-line func-names
      window.googleAsyncInit = async function() {
        const auth = await initgAuth();
        resolve(auth);
        return auth;
      };

      // eslint-disable-next-line func-names
      (function(d, s, id) {
        let js;
        const gjs = d.getElementsByTagName(s)[0];
        if (d.getElementById(id)) {
          return;
        }
        // eslint-disable-next-line prefer-const
        js = d.createElement(s);
        js.id = id;
        js.src = 'https://apis.google.com/js/platform.js';
        js.onload = window.googleAsyncInit;
        gjs.parentNode.insertBefore(js, gjs);
      })(document, 'script', 'google_api');
    }
  });

const useGoogle = () => {
  const [google, setGoogle] = useState([]);
  const [isReady, setReady] = useState(false);

  const initGoogle = useCallback(async () => {
    const auth = await initializeGoogle();
    if (auth !== 'undefined') {
      setGoogle(auth);
      setReady(true);
    }
  });

  useEffect(() => {
    initGoogle();
  }, [initGoogle]);

  return [google, isReady];
};

So I can juse use this at any component like this

  const [GoogleInstance, isGoogleReady] = useGoogle();

   GoogleInstance.signIn().then(response => {
      const authResponse = response.getAuthResponse(true);
      doGoogleLogin(authResponse);
    });

Its quite convenient because I am able to make sure that the SDK is loaded before user can interact with the button itself. Also usable if you have different components/pages that needs to have google login

Answer 5

Just make sure you add google's platform.js script tag to your React app's index.html:

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

---

Get your Client ID from:

https://console.developers.google.com/apis/credentials

---

EDIT Updated example with a real-world implementation I use in deployed production applications

And here's a sample SignInWithGoogle function component implementation in Typescript so you can use as inspiration:

// window.ts
export {};

declare global {
  interface Window {
    gapi: any;
  }
}


// index.tsx
import './window';

import React, {
  useEffect,
  useState,
} from 'react';

const SignInWithGoogle = () => {
  const [loaded, setLoaded] = useState<boolean>(false);
  const [signedIn, setSignedIn] = useState<boolean>(false);

  const onSignIn = (googleUser: {[k: string]: any}) => {
    if (!signedIn) {
      setSignedIn(true);

      const token = googleUser.getAuthResponse().id_token;

      // do something with the token (like send it to your api)...
    }
  };

  const onFail = ({
    error,
  }: {
    error: string;
  }) => {
    // do something
  };

  useEffect(() => {
    const { gapi } = window;

    if (!loaded) {
      gapi.load('auth2', () => {
        gapi.auth2.init().then((auth: any) => {
          auth.signOut().then(() => {
            gapi.signin2.render('google-signin-button', {
              width: 232,
              height: 40,
              longtitle: true,
              onsuccess: onSignIn,
              onfailure: onFail,
            });
          });
        });

        setLoaded(true);
      });
    }
  });

  return (
    <div
      id="google-signin-button"
      className="google-signin-button"
    />
  );
};

export default SignInWithGoogle;

Answer 6

None of the other answers worked for me. The thing that finally worked was using an id instead of a class for the identifier on the div.

<div id="g-signin2" />

instead of

<div className="g-signin2" />

In addition to using window.gapi.signin2.render as other answers suggest.