angularjs - Access scope inside an angular js factory -

i'm using ionic framework , need able call popup muliple places in code thought move factory. popup uses input field , want value of it. call $scope.parentgate.answer because it's in factory don't have access scope. ideas how can value of input field?

here's code:

angular.module('starter.services', []) .factory('parentgate', function ($ionicpopup, helpers) {     return {         show: function(scope, successcallback) {             var first = helpers.randomnumber(1, 5) * 10;             var second = helpers.randomnumber(11, 22);             var title = 'what ' + first + ' + ' + second + ' equal?'             // elaborate, custom popup             return $ionicpopup.show({                 template: '<h4 class="text-center">' + title + '</h4><div class="list"><label class="item item-input"><input type="number" ng-model="parentgate.answer" placeholder="answer..."></label></div>',                 title: "parent gate",                 //subtitle: title,                 scope: scope,                 buttons: [                   { text: 'cancel' },                   {                     text: 'continue',                     type: 'button-positive',                     ontap: function(e) {                        //                       // can't access $scope.parentgate.answer here.                         // how else can it?                       //                       if ($scope.parentgate.answer == first + second) {                           console.log("correct");                         successcallback();                       } else {                         console.log("wrong!");                         e.preventdefault();                       }                     }                   }                 ]             });         }     }; }); 

in fact, can access scope in factory. reason cannot there's no such variable called $scope in parentgate.show function.

seems want use factory pop dialog.

i think in case, pass scope parameter when u try invoke

angular.module("yourapp").controller("testcontroller", function($scope, parentgate){     parentgate.show($scope, callback); }); 

and in factory, when try change property value under $scope, (ontap callback) should use scope, not $scope

ontap: function(e) {     //if ($scope.parentgate.answer == first + second) {      if (scope.parentgate.answer == first + second) {          console.log("correct");         successcallback();      } else {          console.log("wrong!");          e.preventdefault();      }  } 

here demo code.
here reason why want change $scope scope in ontap callback (demo closure)

hope work. : )