Google Sign-In allows users to sign in to your application with their Google accounts
By adding Google Sign-In, you bring the power of Google to your site or application. When a user is signed in, you get an OAuth token for making API requests on their behalf, which you can use to better understand your user, connect them with their friends, and create a richer and more engaging experience.
You can also add the Google+ Sign-In button to your Android or iOS app.
Minimal implementations
Web
Include the required JS headers
<head>
<script src="https://apis.google.com/js/client:platform.js?onload=startApp" async defer></script>
<meta name="google-signin-client_id" content="YOUR_CLIENT_ID"></meta>
</head>
Put a placeholder for containing the button
<body>
<!-- ... -->
<div id="gConnect">
<div id="signin-button"></div>
</div>
<!-- ... -->
</body>
Render the button and handle user sign-in
function startApp() {
gapi.load('auth2', function() {
gapi.client.load('plus','v1').then(function() {
gapi.signin2.render('signin-button', {
scope: 'https://www.googleapis.com/auth/plus.login',
fetch_basic_profile: false });
gapi.auth2.init({fetch_basic_profile: false,
scope:'https://www.googleapis.com/auth/plus.login'}).then(
function (){
console.log('init');
auth2 = gapi.auth2.getAuthInstance();
auth2.isSignedIn.listen( function() {
console.log(auth2.currentUser.get());
});
auth2.then(function(resp){
console.log(auth2.currentUser.get());
});
});
});
});
}
