AngularJS Issue: The function 'FirstCtrl' is missing and is undefined

Question

AngularJS Issue: The function 'FirstCtrl' is missing and is undefined

Currently, I am enrolled in the AngularJS course on egghead.io and have encountered an issue that seems to be a common problem for others as well. Despite trying various solutions found here, none seem to work for me. In the second lesson video, the instructor demonstrates how to connect controllers to ng-apps. I have followed the instructions in the video precisely, restarted multiple times, and attempted different fixes suggested here. However, I keep encountering the following error in the console:

https://i.sstatic.net/MQxbu.png

Among the numerous errors displayed, the initial one caught my attention which reads:

"FirstCtrl' is not a function, got undefined"

Does anyone have a solution to this issue? Has there been any change in the Angular specifications regarding controller assignments or is the course omitting some vital information?

Code:

function FirstCtrl($scope) {
  $scope.data = {
    message: "Hello"
  };
}

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

<head>
  <meta charset="UTF-8>
  <title>My Angular App</title><link href='https://fonts.googleapis.com/css?family=Roboto|Roboto+Condensed:700' rel='stylesheet' type='text/css'></head>

<body>
  <div ng-app="">
    <div ng-controller="FirstCtrl">
      <h1>You said:</h1>
      <h3>{{data.message}}</h3>
    </div>
  </div>
  <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.5/angular.min.js"></script></body>

</html>

javascript angularjs

Answer 1

Answer №1

Check out the example below to see it in action.

Include your application name.
Define your controller using angular.controller.

angular.module('myApp', []);

angular.module('myApp').controller('FirstCtrl', FirstCtrl);

function FirstCtrl($scope) {
  $scope.data = {
    message: "Hello"
  };
}

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

<head>
  <meta charset="UTF-8>
  <title>My Angular App</title>
  <link href='https://fonts.googleapis.com/css?family=Roboto|Roboto+Condensed:700' rel='stylesheet' type='text/css'>
</head>

<body>
  <div ng-app="myApp">
    <div ng-controller="FirstCtrl">
      <h1>You said:</h1>
      <h3>{{data.message}}</h3>
    </div>
  </div>
  <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.5/angular.min.js"></script>
</body>

</html>

Answer 2

Check out the example below to see it in action.

Include your application name.
Define your controller using angular.controller.

angular.module('myApp', []);

angular.module('myApp').controller('FirstCtrl', FirstCtrl);

function FirstCtrl($scope) {
  $scope.data = {
    message: "Hello"
  };
}

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

<head>
  <meta charset="UTF-8>
  <title>My Angular App</title>
  <link href='https://fonts.googleapis.com/css?family=Roboto|Roboto+Condensed:700' rel='stylesheet' type='text/css'>
</head>

<body>
  <div ng-app="myApp">
    <div ng-controller="FirstCtrl">
      <h1>You said:</h1>
      <h3>{{data.message}}</h3>
    </div>
  </div>
  <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.5/angular.min.js"></script>
</body>

</html>

Answer 3

Answer №2

Creating an Angular controller is done like this :

var app = angular.module('myApp',[]); //This is your application

//Here's the controller in the myApp module, where the first parameter is the name of the controller
//The second parameter is an array of dependencies that the controller needs
app.controller('FirstCtrl', ['$scope', function($scope) {
    //You can add any functionality you need within this controller
    $scope.data.message = 'Hello!';
}]);

Next, you connect your controller to the view (your HTML) by using the ng-controller attribute.

Answer 4

Creating an Angular controller is done like this :

var app = angular.module('myApp',[]); //This is your application

//Here's the controller in the myApp module, where the first parameter is the name of the controller
//The second parameter is an array of dependencies that the controller needs
app.controller('FirstCtrl', ['$scope', function($scope) {
    //You can add any functionality you need within this controller
    $scope.data.message = 'Hello!';
}]);

Next, you connect your controller to the view (your HTML) by using the ng-controller attribute.

Answer 5

Answer №3

Don't forget to define your controller in your code.

If you want your FirstCtrl to be a function, make sure to first declare it as a controller.

Here's an example of how to do that:

angular.module("app").controller("FirstCtrl", FirstCtrl);

Next, create your FirstCtrl function like this:

function FirstCtrl($scope) {
  $scope.data = {
    message: "Hello"
 };
}

Remember to include the file in your html scripts as well.

<script src="mypath/firstctrl.js"></script>

Answer 6

Don't forget to define your controller in your code.

If you want your FirstCtrl to be a function, make sure to first declare it as a controller.

Here's an example of how to do that:

angular.module("app").controller("FirstCtrl", FirstCtrl);

Next, create your FirstCtrl function like this:

function FirstCtrl($scope) {
  $scope.data = {
    message: "Hello"
 };
}

Remember to include the file in your html scripts as well.

<script src="mypath/firstctrl.js"></script>

Answer 7

Answer №4

Personally, I encountered an issue when defining a controller as a basic JavaScript function. After downgrading the Angular CDN link version from "1.4.5" to "1.2.28", the controller (a simple JavaScript function) was recognized without any problems. It's important to remember to also include the .js file containing your controller in your HTML document. It seems that starting from Angular 1.3 version, using a simple JavaScript function as a controller has been deprecated.

Answer 8

Personally, I encountered an issue when defining a controller as a basic JavaScript function. After downgrading the Angular CDN link version from "1.4.5" to "1.2.28", the controller (a simple JavaScript function) was recognized without any problems. It's important to remember to also include the .js file containing your controller in your HTML document. It seems that starting from Angular 1.3 version, using a simple JavaScript function as a controller has been deprecated.

AngularJS Issue: The function 'FirstCtrl' is missing and is undefined

Answer №1

Answer №2

Answer №3

Answer №4

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