What is the best way to declare a global variable while making an asynchronous call using AngularJS?

Question

What is the best way to declare a global variable while making an asynchronous call using AngularJS?

Is there a way to utilize the single_video variable outside of the controller function? The issue arises when attempting to access it in the second console.log, as it returns an 'undefined' error due to asynchronousity despite successfully printing in the first console log.

var single_video;
var app = angular.module('myApp', []);
app.controller('randomVideo', function($scope, $http) {
    var onSuccess = function(response){
        $scope.video = response.data; 
        single_video = $scope.video;
        //First console.log
        console.log('1st ID='+single_video.yt_id);
    };
    var onError = function(reason){
        $scope.error = "There is an error about getting random_video.php";
    };
   $http.get("http://www.ytmdb.com/ytvideo/api/random_video.php")
   .then(onSuccess, onError);
});
//Second console.log
console.log('2nd ID='+single_video.yt_id);

javascript angularjs asynchronous

Answer 1

Answer №1

To incorporate your variable into a function called within the success callback, you can follow this example:

var app = angular.module('myApp', []);
app.controller('randomVideo', function($scope, $http) {
    var onSuccess = function(response){
        $scope.video = response.data; 
        single_video = $scope.video;
        //First console.log
        console.log('1st ID='+single_video.yt_id);
        test(single_video.yt_id);
    };
    var onError = function(reason){
        $scope.error = "There is an error about getting random_video.php";
    };
    $http.get("http://www.ytmdb.com/ytvideo/api/random_video.php")
    .then(onSuccess, onError);
});
function test(a)
{
    console.log('2nd ID='+a);
}

Answer 2

To incorporate your variable into a function called within the success callback, you can follow this example:

var app = angular.module('myApp', []);
app.controller('randomVideo', function($scope, $http) {
    var onSuccess = function(response){
        $scope.video = response.data; 
        single_video = $scope.video;
        //First console.log
        console.log('1st ID='+single_video.yt_id);
        test(single_video.yt_id);
    };
    var onError = function(reason){
        $scope.error = "There is an error about getting random_video.php";
    };
    $http.get("http://www.ytmdb.com/ytvideo/api/random_video.php")
    .then(onSuccess, onError);
});
function test(a)
{
    console.log('2nd ID='+a);
}

Answer 3

Answer №2

To ensure global variables are accessible throughout your Angular application, create a factory service to define them and then inject the service into any controller where they are needed. Remember to encapsulate everything in an IIFE for better code structure.

Here is an example of defining global variables using services:

var myApp = angular.module('myApp',[]);
myApp.factory('MySvc', function() {
return {
  name: 'John Doe'
};
});

And here's how you can access this variable in a controller:

function MyCtrl($scope, MySvc) {
$scope.name = MySvc.name;
}

Answer 4

To ensure global variables are accessible throughout your Angular application, create a factory service to define them and then inject the service into any controller where they are needed. Remember to encapsulate everything in an IIFE for better code structure.

Here is an example of defining global variables using services:

var myApp = angular.module('myApp',[]);
myApp.factory('MySvc', function() {
return {
  name: 'John Doe'
};
});

And here's how you can access this variable in a controller:

function MyCtrl($scope, MySvc) {
$scope.name = MySvc.name;
}

What is the best way to declare a global variable while making an asynchronous call using AngularJS?

Answer №1

Answer №2

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