Sakramentas Sakramentas - 6 months ago 39
Javascript Question

Angular services giving "TypeError: Cannot read property 'helloConsole' of undefined"

I'm studying AngularJS Services and I'm having a problem.

That's my Angular code:

var app = angular.module("todoListApp");

app.controller('MainController', MainController);

MainController.$inject = ['$scope'];

function MainController($scope, dataService){
$scope.helloConsole = dataService.helloConsole;

app.service('dataService', function(){
this.helloConsole = function(){
console.log("console services");

That's my HTML Code

<div ng-controller="MainController" class="list">
<div class="item" ng-class="{'editing-item' : editing, 'edited': todo.edited}" ng-repeat="todo in todos">
<div class="actions">
<a href="" ng-click=" editing = !editing">Edit</a>
<a href="" ng-click="helloConsole()">Save</a>
<a href="" class="delete">Delete</a>

I'm trying to make it so that when I click on Save, the console shows me "console services", but it's giving me an error:

angular.js:13424 TypeError: Cannot read property 'helloConsole' of undefined


Proper Angular Structure

you need to change the way you have written your code. It should look more like this

angular.module("todoListApp", [])

.controller('MainController', ['$scope', 'dataService', function($scope, dataService){

    $scope.helloConsole = dataService.helloConsole;


.service('dataService', [function(){
    this.helloConsole = function(){
        console.log("console services");

Also this is a 'data service' is this gettig data with a http call? Because if so then make a factory.

  • Controllers for business logic
  • Factories for data requests
  • Services for things like login
  • Directives for DOM manipulation
  • Filters for format