Separating Controllers in AngularJS: The Importance of Defining Arguments as Functions

Although this question has been asked numerous times, I am still unable to identify the error. Despite searching through similar questions extensively, I cannot seem to pinpoint the issue. Initially, everything was implemented on one page and it worked fine. However, to improve organization, I decided to separate my controllers into different files. Here is what I have done:

partials/hosts.html:

Hosts Page
<div ng-controller="HostsCtrl">
    {{ title }}
</div>

index.html

<html>
<head>
    <script src="bower_components/angular/angular.js"></script>
    <script src="bower_components/angular-route/angular-route.js"></script>
    <script src="bower_components/angular-bootstrap/ui-bootstrap.min.js"></script>
    <script src="js/myApp.js"></script>
    <script src="js/HostsCtrl.js"></script>
</head>

<body ng-app="MyApp">
...

js/MyApp.js

The MyApp module is created, along with a submodule named controllers

var app = angular.module('MyApp', ['ngRoute', 'ui.bootstrap']);
console.log("index.js file loaded");

angular.module('MyApp.controllers', []);

js/HostsCtrl.js

This simple controller is within the MyApp.controllers module, displaying a hello world message along with the current time.

console.log("HostsCtrl.js file loaded");
angular.module('MyApp.controllers').controller("HostsCtrl", function($scope) {
    $scope.title = "Hello world" + new Date().getTime();
});

The console output:

index.js file loaded MyApp.js:2
HostsCtrl.js file loaded HostsCtrl.js:1
Error: [ng:areq] Argument 'HostsCtrl' is not a function, got undefined

Despite double-checking the loading order, I can't seem to understand why the error stating that it cannot resolve HostsCtrl persists. What could I possibly be doing wrong?

Answer №1

Seems like you forgot to specify the dependency on MyApp.controllers module for your application. Make sure to include it in the list of dependencies like so:

var app = angular.module('MyApp', [
    'ngRoute', 
    'ui.bootstrap',
    'MyApp.controllers'
]);

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