javascript - No response data after call a function -

i have file called login.php, in file there box fill send login data server. when user press login button, code fired:

 var posturl = globalvariables.baseurl + 'application/controllers/user.php/ajax_check_login';  var postdata =  {       'username': $('#username').val(),       'password': $('#password').val()  };   $.post(posturl, postdata, function(response)  {       // stuff..  }, 'json'); 

the posturl valorized correctly by:

http://localhost/app_name/application/controllers/user.php/ajax_check_login

now have list of own controller allow me manage web app. 1 of controller user.php, how can see call ajax_check_login function. function check if data passed request exists in database , if correct. content:

public function ajax_check_login() {        echo "test?";     try     {         if(!isset($_post['username']) || !isset($_post['password']))         {             throw new exception('bad credentials!');         }          $this->check_login($_post['username'], $_post['password']);          if($user_data)         {             $output[] = array(                 "some content..."             echo json_encode($output);         }         else         {             echo json_encode(ajax_failure);         }      }     catch(exception $exc)     {         echo json_encode(array(             'exception ' => array(exceptiontojavascript($exc))         ));     } } 

now, @ top of inserted echo, test if printed. nothing. in chrome console get:

this request has no response data available.

i don't know wrong, enlighten me?

first, you'd check what's return server, http200 without contents? or error 500. why i'm saying because snippet tells there few variables/functions missing. check comments:

public function ajax_check_login() {        echo "test?";     try     {         if(!isset($_post['username']) || !isset($_post['password']))         {             throw new exception('bad credentials!');         }          $this->check_login($_post['username'], $_post['password']);          if($user_data) // $user_data never defined in function, , it's not global variable         {             $output[] = array(                 "some content..." // syntax error; here missing end parenthesis             echo json_encode($output);         }         else         {             echo json_encode(ajax_failure);         }      }     catch(exception $exc)     {         echo json_encode(array(             'exception ' => array(exceptiontojavascript($exc)) // unknown function exceptiontojavascript(); encounter fatal error         ));     } } 

second, suggest send header define you're sending json encoded content, , exit() after echo. see example:

header('content-type: application/json'); echo json_encode(/** return **/); exit();