如何使用CodeIgniter在本地主机上的网站上集成Facebook登录？

Question

I am trying to integrate facebook login on my website on localhost using CodeIgniter. I created a fb_login function in controller user.php where different functions are also defined. The problem is that when I call fb_login function from login_view.php then it doesn't work, where as when fb_login is defined in a separate controller and called, its function then works...

Here's the code:

user.php (controller)

public function fb_login(){

        $this->load->library('facebook');                
        $user = $this->facebook->getUser();
        echo $user;
        if ($user) {
            try{
            $user_profile = $this->facebook->api('/me?locale=en_US&fields=name,email');
            }
            catch (FacebookApiException $e){
                $user = null;
            }
        }
        else{
            $this->facebook->destroySession();
        }

        if ($user) {
            $logout_url = site_url('user/logout');
            $user_data =array(
                'user_id' => $user_profile['id'],
                'username' => $user_profile['name'],
                'logged_in' => true
            );

            $this->session->set_userdata($user_data);
            $this->load->view('profile_view');//,$logout_url,$user_profile);
        }
        else{
            $login_url = $this->facebook->getLoginUrl(array(
                'redirect_uri' => site_url('user/login_page'),
                'scope' => 'email'
                ));

            $this->load->view('login_view',$login_url);    
        }

}

but this works fblogin.php (controller)

class Fblogin extends CI_Controller { 

    public function Login(){


        $this->load->library('facebook');

        $user = $this->facebook->getUser();
        echo $user;
        if ($user) {
            try{
            $data['user_profile'] = $this->facebook->api('/me?locale=en_US&fields=name,email');
            }
            catch (FacebookApiException $e){
                $user = null;
            }
        }
        else{
            $this->facebook->destroySession();
        }

        if ($user) {
            $data['logout_url'] = site_url('fblogin/logout');     
        }
        else{
            $data['login_url'] = $this->facebook->getLoginUrl(array(
                'redirect_uri' => site_url('fblogin/login'),
                'scope' => 'email'
                ));

        }
        $this->load->view('login',$data);
    }

    public function logout() {
        $this->load->library('facebook');
        $this->facebook->destroySession();
        redirect('fblogin/login');
    }

}

Answer 1

In Facebook Developer , set the "Site URL" to your local address, " http://localhost/[yourSiteName] ".

Facebook does not redirect back to your server. FB JavaScript plugin does and it runs in the context of your browser, which knows where "localhost" points to.

And do not forget to change it back to your domain when your done.

Answer 2

I would imagine this has something to do with the urls/routes you are using since it works from from one controller and not the other. Be certain you are calling the correct url /controller/method and not just calling it like /method thinking that will hit the appropriate controller method.