Implement Facebook API login with reactjs

Question

I\'m working on using Facebook\'s Javascript SDK for authentication. I\'ve been able to import the SDK properly and put a Like button on my page. But, the facebook login but

Answer 1

I have figured out how to modify the Facebook tutorial for the Login API with ReactJS. I hope this helps anyone else struggling with this.

Firstly, in the react component where you want the Login link, include this code:

componentDidMount: function() {
  window.fbAsyncInit = function() {
    FB.init({
      appId      : '',
      cookie     : true,  // enable cookies to allow the server to access
                        // the session
      xfbml      : true,  // parse social plugins on this page
      version    : 'v2.1' // use version 2.1
    });

    // Now that we've initialized the JavaScript SDK, we call
    // FB.getLoginStatus().  This function gets the state of the
    // person visiting this page and can return one of three states to
    // the callback you provide.  They can be:
    //
    // 1. Logged into your app ('connected')
    // 2. Logged into Facebook, but not your app ('not_authorized')
    // 3. Not logged into Facebook and can't tell if they are logged into
    //    your app or not.
    //
    // These three cases are handled in the callback function.
    FB.getLoginStatus(function(response) {
      this.statusChangeCallback(response);
    }.bind(this));
  }.bind(this);

  // Load the SDK asynchronously
  (function(d, s, id) {
    var js, fjs = d.getElementsByTagName(s)[0];
    if (d.getElementById(id)) return;
    js = d.createElement(s); js.id = id;
    js.src = "//connect.facebook.net/en_US/sdk.js";
    fjs.parentNode.insertBefore(js, fjs);
  }(document, 'script', 'facebook-jssdk'));
},

// Here we run a very simple test of the Graph API after login is
// successful.  See statusChangeCallback() for when this call is made.
testAPI: function() {
  console.log('Welcome!  Fetching your information.... ');
  FB.api('/me', function(response) {
  console.log('Successful login for: ' + response.name);
  document.getElementById('status').innerHTML =
    'Thanks for logging in, ' + response.name + '!';
  });
},

// This is called with the results from from FB.getLoginStatus().
statusChangeCallback: function(response) {
  console.log('statusChangeCallback');
  console.log(response);
  // The response object is returned with a status field that lets the
  // app know the current login status of the person.
  // Full docs on the response object can be found in the documentation
  // for FB.getLoginStatus().
  if (response.status === 'connected') {
    // Logged into your app and Facebook.
    this.testAPI();
  } else if (response.status === 'not_authorized') {
    // The person is logged into Facebook, but not your app.
    document.getElementById('status').innerHTML = 'Please log ' +
      'into this app.';
  } else {
    // The person is not logged into Facebook, so we're not sure if
    // they are logged into this app or not.
    document.getElementById('status').innerHTML = 'Please log ' +
    'into Facebook.';
  }
},

// This function is called when someone finishes with the Login
// Button.  See the onlogin handler attached to it in the sample
// code below.
checkLoginState: function() {
  FB.getLoginStatus(function(response) {
    this.statusChangeCallback(response);
  }.bind(this));
},

handleClick: function() {
  FB.login(this.checkLoginState());
},

Then, in your render method, make sure you have some HTML that will call that handleClick:

Login

Note, this is the same code from the tutorial, but placed in a ReactJS component. The only difference is that you have to bind this strategically to make the Facebook API functions part of your react component. This login will finish with a response message parsed from the response given by FB.getLoginStatus(). You can also take the token out of that response object and send it to your backend for authentication with something like passport-facebook-token.