Triggering Javascript Code from PHP Laravel Controller -

i'm using oauth login in laravel controller. working fine thing when user registered first time, wanna trigger html 5 geolocation api fetch user's current location , mixpanel stuff. earlier using ajax in js login there no such problem i've implemented complete server side solution, i'm stuck 1 problem.

the laravel controller code looks :

       function callback(){           \\ fetch access token , 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 :

             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 allow deny geolocation popup.                       }                     }                  });