fblogin.js

<LoginButton
            publishPermissions={["publish_actions"]}
            onLoginFinished={
              (error, result) => {
                if (error) {
                  alert("login has error: " + result.error);
                } else if (result.isCancelled) {
                  alert("login is cancelled.");
                } else {
                  AccessToken.getCurrentAccessToken().then(
                    (data) => {
                      this.props.loginWithFacebook(data.accessToken.toString());
                    }
                  )
                }
              }
            }
            onLogoutFinished={() => alert("logout.")}/>