display the $scope as undefined in an angular application

Below is my code snippet:

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

    function ExchangeController($scope, $http) {

        $scope.items = [];
        $http
            .get(window.location.origin + "/api/get-item/", {
                transformRequest: angular.identity,
                headers: {'Content-Type': undefined, 'Process-Data': false}
            })
            .then(function(response){
                $scope.items = response.data.items;
                console.log($scope.items);
            });

        console.log($scope.items);

    }

The first console.log statement is working fine, but the second one is showing 'undefined'. Any insights on why?

Answer №1

Make sure to pay attention to the second console.log($scope.items); It should display an empty array. The reason for this is due to the fact that $http.get is making an asynchronous call. This means that the code inside the then block will only run after the http request is complete, allowing the remaining code to execute. If you are not familiar with asynchronous code, I recommend checking out angular's documentation on General Usage and Promises in JavaScript.

For a practical demonstration of asynchronous operations, take a look at this example I prepared for you.

Answer №2

The reason for this issue is that the $http block operates asynchronously. This means that by the time your console.log($scope.items) is reached, the http request may not have completed yet, causing the item to be undefined.

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