In AngularJS, the value of a $scope variable cannot be accessed outside of the $http success callback

I am currently new to AngularJS and starting to learn it.

Recently, I developed a basic app for displaying content from a JSON file. However, when attempting to access the data assigned to scope outside of the $http function, it returns as undefined.

var app = angular.module('app',[]); 

app.controller('apCtrl',['$scope','$http',function($scope,$http){

  $http.get('/path/to/data.json').success(function(){

   console.log(data); // Data successfully returned
   $scope.data = data; // Data assigned to scope
   console.log($scope.data);  // Data accessible

  });

  console.log($scope.data); // Returns 'undefined'

}]);

I would appreciate any guidance in understanding this issue.

Thank you!

Answer №1

The reason for this issue is due to the asynchronous nature of the call you are making. The data may not be ready when you attempt to access it outside of the success function. It is crucial to reference the documentation for more insight.

To illustrate, after a brief delay, the expected outcome would be:

app.controller('apCtrl',['$scope','$http','$timeout',function($scope, $http, $timeout){

  $http.get('/path/to/data.json').success(function(){

   console.log(data); // displays data -- working
   $scope.data = data; // assigned correctly
   console.log($scope.data);  // displays data -- functioning as expected

  });
  
  $timeout(function(){
    console.log($scope.data);
  }, 2000);

}]);

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