Error: Angular is encountering an issue with accessing the property 'push' as it is currently undefined

I have successfully created a news ticker that works well in my codepen example. However, I am encountering an issue with integrating it into my code structure. The error message I am currently receiving is:

Cannot read property 'push' of undefined

Below is a snippet of the controller code causing this issue:

"use strict";

 var app = angular.module('portlandApp');

// WEB SERVICE GET REQUEST
var NewsService = function ($http){
this.$http = $http;
}

NewsService.prototype.getarticles = function () {
return this.$http.get('app/data/news.json').then(function (response){
    return response.data;
});
  };

app.service("newsService", NewsService);

angular
 .module('portlandApp')
 .controller('newsCtrl', ['$scope', 'newsService', '$location', '$interval',   '$timeout', function($scope, newsService, $location, $timeout, $interval) {

 var promise = newsService.getarticles();
  promise.then(function (data){
  $scope.articles = data.news.map(function(item) {
    //item.date = moment().format('Do MMMM YYYY');
    return item;
  });
console.log(data)
 });
 // AMOUNT OF ARTICLES
   $scope.articleLimit = 4;

// NEWS TICKER FUNCTION
$scope.moving = false;

$scope.moveLeft = function() {
    $scope.moving = true;
    $timeout($scope.switchFirst, 1000);
};
$scope.switchFirst = function () {
    $scope.news.push($scope.newsLink.shift());
    $scope.moving = false;
    $scope.$apply();
};

$interval($scope.moveLeft, 2000);


 }]);

Answer №1

Always ensure you initialize $scope.news by including $scope.news = [] at the start of the controller script.

Answer №2

Give this a shot:

// FUNCTION FOR NEWS TICKER
$scope.isMoving = false;

// Define an empty array for news items
$scope.newsData = [];

// Your code goes here

$scope.moveRight = function() {
   $scope.isMoving = true;
   $timeout($scope.updateFirst, 1000);
};

$scope.updateFirst = function () {
   $scope.newsData.push($scope.newsLink.shift());
   $scope.isMoving = false;
   $scope.$digest();
};

Answer №3

Start off your controller by initializing $scope.news= []

If you try to add values to $scope.news before declaring it, the variable will be undefined

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