javascript - How to test for success after calling a AngularJS factory service -

i wondering how check wether or not function successfull or had error. check in function itself. how can recheck result when calling service.

i've tried this

      entryservice.update($scope.entry)         .success(function(){           $scope.entry = data;           $state.go('entry', {id: $scope.entry._id});         }).error(function(){           error = true;         }); 

this doesn't work. , wondering how similar result?

my service funtion looks this:

angular.module('academiaunitateapp')     .factory('entryservice',function($http){         var service = {};          service.update = function(entry, callback){             $http.put('/api/entrys/' + entry._id, entry)                 .success(callback, function(data){                     console.log('updated entry : ', data);                 })                 .error(callback, function(error){                     console.log("couldn't update entry. error : ", error);                 });         };          return service;   }); 

you can return true or false function success or failure.