How come the Facebook Login Button is not available in the Custom Login Form?

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Hi @elusive,

Welcome to the Auth0 Community!

Here is an example with both FB and google:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
  <title>Sign In with Auth0</title>
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
</head>
  <style>
    body, html {
      height: 100%;
      background-color: #f9f9f9;
    }

    .login-container {
      position: relative;
      height: 100%;
    }

    .login-box {
      position: absolute;
      top: 50%;
      transform: translateY(-50%);
      padding: 15px;
      background-color: #fff;
      box-shadow: 0px 5px 5px #ccc;
      border-radius: 5px;
      border-top: 1px solid #e9e9e9;
    }

    .login-header {
      text-align: center;
    }

    .login-header img {
      width: 75px;
    }

    #error-message {
      display: none;
      white-space: break-spaces;
    }
  </style>
<body>
  <div class="login-container">
    <div class="col-xs-12 col-sm-4 col-sm-offset-4 login-box">
      <div class="login-header">
        <img src="https://cdn.auth0.com/styleguide/1.0.0/img/badge.svg"/>
        <h3>Welcome</h3>
        <h5>PLEASE LOG IN</h5>
      </div>
      <div id="error-message" class="alert alert-danger"></div>
      <form onsubmit="return false;" method="post">
        <div class="form-group">
         <label for="name">Email</label>
          <input
            type="email"
            class="form-control"
            id="email"
            placeholder="Enter your email">
        </div>
        <div class="form-group">
          <label for="name">Password</label>
          <input
            type="password"
            class="form-control"
            id="password"
            placeholder="Enter your password">
        </div>
        <div class="captcha-container form-group"></div>
        <button
          type="submit"
          id="btn-login"
          class="btn btn-primary btn-block">
            Log In
        </button>
        <button
          type="button"
          id="btn-signup"
          class="btn btn-default btn-block">
            Sign Up
        </button>
        <hr>
        <button
          type="button"
          id="btn-google"
          class="btn btn-default btn-danger btn-block">
            Log In with Google
        </button>
        <button
          type="button"
          id="btn-facebook"
          class="btn btn-default btn-danger btn-block">
            Log In with Facebook
        </button>
      </form>
    </div>
  </div>

  <!--[if IE 8]>
  <script src="//cdnjs.cloudflare.com/ajax/libs/ie8/0.2.5/ie8.js"></script>
  <![endif]-->

  <!--[if lte IE 9]>
  <script src="https://cdn.auth0.com/js/polyfills/1.0/base64.min.js"></script>
  <script src="https://cdn.auth0.com/js/polyfills/1.0/es5-shim.min.js"></script>
  <![endif]-->

  <script src="https://cdn.auth0.com/js/auth0/9.18/auth0.min.js"></script>
  <script src="https://cdn.auth0.com/js/polyfills/1.0/object-assign.min.js"></script>
  <script>
    window.addEventListener('load', function() {

      var config = JSON.parse(
        decodeURIComponent(escape(window.atob('@@config@@')))
      );

      var leeway = config.internalOptions.leeway;
      if (leeway) {
        var convertedLeeway = parseInt(leeway);
      
        if (!isNaN(convertedLeeway)) {
          config.internalOptions.leeway = convertedLeeway;
        }
      }

      var params = Object.assign({
        overrides: {
          __tenant: config.auth0Tenant,
          __token_issuer: config.authorizationServer.issuer
        },
        domain: config.auth0Domain,
        clientID: config.clientID,
        redirectUri: config.callbackURL,
        responseType: 'code'
      }, config.internalOptions);

      var webAuth = new auth0.WebAuth(params);
      var databaseConnection = 'Username-Password-Authentication';
      var captcha = webAuth.renderCaptcha(
        document.querySelector('.captcha-container')
      );

      function login(e) {
        e.preventDefault();
        var button = this;
        var username = document.getElementById('email').value;
        var password = document.getElementById('password').value;
        button.disabled = true;
        webAuth.login({
          realm: databaseConnection,
          username: username,
          password: password,
          captcha: captcha.getValue()
        }, function(err) {
          if (err) displayError(err);
          button.disabled = false;
        });
      }

      function signup() {
        var button = this;
        var email = document.getElementById('email').value;
        var password = document.getElementById('password').value;

        button.disabled = true;
        webAuth.redirect.signupAndLogin({
          connection: databaseConnection,
          email: email,
          password: password,
          captcha: captcha.getValue()
        }, function(err) {
          if (err) displayError(err);
          button.disabled = false;
        });
      }

      function loginWithGoogle() {
        webAuth.authorize({
          connection: 'google-oauth2'
        }, function(err) {
          if (err) displayError(err);
        });
      }

      function loginWithFacebook() {
        webAuth.authorize({
          connection: 'facebook'
        }, function(err) {
          if (err) displayError(err);
        });
      }

      function displayError(err) {
        captcha.reload();
        var errorMessage = document.getElementById('error-message');
        errorMessage.innerHTML = err.policy || err.description;
        errorMessage.style.display = 'block';
      }

      document.getElementById('btn-login').addEventListener('click', login);
      document.getElementById('btn-google').addEventListener('click', loginWithGoogle);
      document.getElementById('btn-facebook').addEventListener('click', loginWithFacebook);
      document.getElementById('btn-signup').addEventListener('click', signup);
    });
  </script>
</body>
</html>

As for why…This login form is simply an example of what is possible with auth0.js. The custom login form is available for Auth0 developers who are comfortable navigating the SDK and coding HTML, CSS, and JS. You can certainly add a Facebook button, and AFAIK there isn’t a specific reason why it wasn’t used as the example (I don’t know for sure why Google was used as the social example, but I would imagine it was selected due to its popularity).