Trouble connecting AngularJS controller to the view

I'm struggling to understand why the text I input in my controller isn't linking to the view.

After creating two JavaScript files - app.js and MainController.js, things still aren't working as expected.

Following a tutorial on Codecademy, I tried replicating a similar scenario. However, it seems like I might be overlooking something quite fundamental, which is eluding me at the moment.

Here are the files I'm working with:

index.html

<!DOCTYPE html>
<html lang="en">

<body ng-app="myApp" ng-controller="MainController">
  <h1>{{title}}</h1>

  <scipt src="js/app.js"></scipt>

  <script src="js/controller/MainController.js"></script>
</body>

</html>

app.js

var app = angular.module('myApp', []);

MainController.js

app.controller('MainController', ['$scope', function ($scope) {
    $scope.title = 'Hello!';
}]);

I suspect that the issue could be related to having my Main Controller in a separate file from the app.js script.

Answer №1

It appears that Angular is missing from your main page (index.html). To resolve this issue, simply include the following line:

<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>

Answer №2

It is important to initialize the app variable before using it in MainController.js

// MainController.js
var app = angular.module('myApp');

Answer №3

Inside mainController

angular.module('myApp').controller(......

Answer №4

To ensure Angular.js is properly loaded, make sure to add it to your head tag before your app.js file. It seems like Angular may not be loading correctly at the moment.

index.html

 <head>
   <title>{{title}}</title>
   <script data-require="<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="87e6e9e0f2ebe6f5a9edf4c7b6a9b2a9b7aaf5e4a9b7">[email protected]</a>" data-semver="1.5.0-rc.0" src="https://code.angularjs.org/1.5.0-rc.0/angular.js"></script>
   <link rel="stylesheet" href="style.css" />
   <script src="app.js"></script>
 </head>

 <body >
   <h1>{{title}}</h1>
   {{1+1}}
 </body>
</html>

app.js

(function() {
 angular.module('myApp', [])
   .controller('mainController', ['$scope', function($scope) {
     $scope.title = 'Hello world!';
   }]);
}())

NOTE: Avoid declaring a variable app on the global scope as it can be overwritten. Instead, use an Immediately-invoked Function Expression (IFFE) and add controllers to your module. Consider creating separate modules for services in other files.

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