Question

I have a controller where in the constructor function, I want to check if the user is logged in or not. If not, I want an error message to be displayed, and for the script to exit without running any other function in the controller. This controller will only be called by ajax so the error would be displayed via JSON and then the javascript on the client will display it to the user.

How can I do this? If I did this:

function __construct()
{
   if (! $this->loggedIn() )
   {
      echo json_encode( array('error'=> true) );
      die;
   }    
}

I don’t think the message would be displayed because codeigniter uses output buffering. Any ideas?

Answer 1

i understood that your problem is the client expects for a json type of response, so two options to use:

public function __construct(){

    $_bad_login_msg = 'please try again' ;
    parent::__construct();

    if(!userLoggedIn()){

        $this->output
        ->set_content_type('application/json')
        ->set_output(json_encode($_bad_login_msg));

        //or just use 
        //     echo json_encode($_bad_login_msg);
        die;
    }
}

http://codeigniter.com/user_guide/libraries/output.html

you won’t have any buffering problems, the buffer contents will be sent to the client after the die…