AngularJs http get response is undefined But the data is present inside success function

Question

Am new to angular. I have tried to get the json response from http get method.

My code is,

app.factory('getdata', function ($http, $q){
  this.getlist = function(){       
    alert('1');
    return $http.get('http://www.w3schools.com/angular/customers.php',{'Access-Control-Allow-Origin': 'localhost:*'})
    .then(function(response) {
      console.log('response'); console.log(response.data); //I get the correct items, all seems ok here
        alert('2');
        return response.data;
      });            
  }
  return this;
});
/* Stream page controller */
app.controller('streamCtrl', function($scope,getdata, $ionicSlideBoxDelegate, $timeout, $ionicScrollDelegate, $location, $sce){
  $scope.trustSrc = function(src) {
    return $sce.trustAsResourceUrl(src);
  }
  getdata.getlist()
  .then(function(arrItems){
   $scope.sliders = arrItems;         
 });
alert($scope.sliders);

am getting the alert like 1, 'undefined' and 2 but the $scope.sliders has the data. because It was working once I resize the screen and also I can get correct alert inside the

getdata.getlist().then(function(arrItems) {
  $scope.sliders = arrItems;         
  alert($scope.sliders);
});

Answer 1

The reason for getting alert is undefined is because you haven't define $scope.sliders in controller and http request is async so alert($scope.sliders); function call before getting data from response and setting that data to $scope.sliders.

You get alert($scope.sliders); value only after getting success response.

Other possibility is you can set $scope.sliders = {} and then use alert($scope.sliders); which show {} in alert when then function is called alert shows actual response.

Original plunker based on issue

Check comments and updated code in new plunker