Mastering MVC in AngularJS: A Step-by-Step Guide

While attempting to execute the code provided below, I am encountering the following error: Argument

'MyController' is not a function, got undefined
.

<!DOCTYPE html>
<html lang="en" ng-app>

<head>
  <meta charset="utf-8" />
  <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/angularjs/1.3.15/angular.min.js"></script>
  <title>Hello world from Prateek</title>
</head>

<body>
  <div ng-controller="MyController">
    <h1>{{author.name}}</h1>
    <p>{{author.title + ', ' + author.company}}</p>
  </div>
  <script>
    function MyController($scope) {
      $scope.author = {
        'name': 'J Doe',
        'title': 'Designer',
        'company': 'ABC XYZ'
      }
    }
  </script>
</body>

</html>

Instead of getting the expected output displaying name, title, and company, the actual output is as follows:

{{author.name}}
{{author.title + ', ' + author.company}}

Answer №1

If you're looking to incorporate Angular into your JavaScript code, make sure to define an Angular application first. You can do this by creating a controller within the module you have established. Once done, you'll be able to access this controller from your respective views. To demonstrate, check out the snippet below:

<!DOCTYPE html>
<html lang="en" ng-app ="myApp">

<head>
  <meta charset="utf-8" />
  <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/angularjs/1.3.15/angular.min.js"></script>
  <title>Hello world from Prateek</title>
</head>

<body>
  <div ng-controller="MyController">
    <h1>{{author.name}}</h1>
    <p>{{author.title + ', ' + author.company}}</p>
  </div>
  <script>
    var myApp = angular.module("myApp", []); // defining the module here for later use in the ng-app directive to initialize AngularJS
    myApp.controller("MyController", function ($scope) {
      $scope.author = {
        'name': 'J Doe',
        'title': 'Designer',
        'company': 'ABC XYZ'
      }
    });
  </script>
</body>

</html>

Answer №2

If you want to start building an Angular application, the first step is creating a module and then adding a controller. Here is an example of how you can do it:

var app = angular.module('myApp', []);
app.controller('MyController', function($scope) {
    $scope.author = {
        'name': 'John Doe',
        'title': 'Developer',
        'company': 'XYZ Corp'
      }
});

Don't forget to include ng-app="module-name" in your HTML like this:

<html lang="en" ng-app="myApp">

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