Triggering Javascript Code from PHP Laravel Controller

Question

I'm using OAuth for login in my Laravel Controller. Its working fine but the thing is when the user is registered for the first time, I wanna trigger the HTML 5 geolocation API to fetch the user's current location and do some mixpanel stuff. Earlier I was using AJAX in the JS for the login so there was no such problem but now that I've implemented a complete server side solution, I'm stuck with this one problem.

The Laravel Controller code looks something like this :

       function callback(){
          \\ fetch the access token and graph data
          if($res = \Auth::mjAuthenticate('facebook', $fbData)){                    
                $user = \Auth::scope()->getUser();                          

                return \Redirect::to('events'); 
            }
            if (\Auth::mjRegister('facebook', $fbData)) {

                $user = \Auth::scope()->getUser();                                      

                return \Redirect::to('events');
            }

            return $this->handleFailure('Some Problem Occured');
        }

The Earlier JS Code was :

             ajax
                .post('auth/login', {
                    data: {
                        oauth_provider: 'facebook',
                        oauth_token: accessToken
                    },
                    cache: false
                })
                .done(function(data) {                                              

                    mixpanel.track('User Logged In', {
                        id: data.resource.id,
                        provider: 'Facebook',
                        email: data.resource.email,
                        first_name: data.resource.first_name,
                        last_name: data.resource.last_name
                    });
                    if (data.msg == 'Resource registered') {
                      if(navigator.geolocation){
                      // Prompt for Allow Deny Geolocation popup.
                      }
                    }
                 });