Implement Facebook API login with reactjs

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 button has to be wrapped in the tag:

<fb:login-button/>

I currently have all of the code from the Facebook Login tutorial pasted into my index.html, the only html file in my project, which houses the React application. But, I need to put the last part, which has the actual login button, into my React component. When I tried to do that, I got the following error:

ReactifyError: /Users/ritmatter/reps/js/components/Signup.jsx: Parse Error: Line 82: Unexpected end of input while parsing file: /Users/ritmatter/reps/js/components/Signup.jsx
sdk.js:61 The "fb-root" div has not been created, auto-creating
ping?client_id=894010190618709&domain=localhost&origin=1&redirect_uri=http%3A%2F%2Fstatic.ak.facebo…:1 Given URL is not allowed by the Application configuration.: One or more of the given URLs is not allowed by the App's settings.  It must match the Website URL or Canvas URL, or the domain must be a subdomain of one of the App's domains.

How can I get the login button into react?

Answer

I have figured out how to modify the Facebook tutorial for the Login API with ReactJS.

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

componentDidMount: function() {
  window.fbAsyncInit = function() {
    FB.init({
      appId      : '<YOUR_APP_ID>',
      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:

<a href="#" onClick={this.handleClick}>Login</a>

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.