Struggling with creating a simple AngularJS controller

Question

Struggling with creating a simple AngularJS controller

Apologies if my question seems basic, but I am currently learning about AngularJS controllers.

Below is the structure of my project:

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

Here is the snippet of my HTML code:

<!doctype html>
<html ng-app>

<head>
    <script src = "https://ajax.googleapis.com/ajax/libs/angularjs/1.3.3/angular.min.js"></script>
    <script src="js/controllers.js" />
</head>

<body>

<div ng-controller="numberController">
<input type = "text" ng-model = "number.number1" placeholder = "Enter a number here">

<input type = "text" ng-model = "number.number2" placeholder = "Enter another number here">
{{number.number1}} + {{number.number2}} = {{number.sumIt()}}

</div>
</body>
</html>

This snippet shows my controller implementation:

function numberController($scope) {
    $scope.number = {
        number1: 0,
        number2: 0,

        sumIt: function() {
            var numObj;
            numObj = $scope.number;
            return parseInt(numObj.number1) + parseInt(numObj.number2);
        }
    };
}

I'm facing issues with loading the webpage and seeking guidance on what could be wrong.

Upon further investigation, I received this error message: Error Message Link.

I made some updates to my controller as follows:

var saApp = angular.module("saApp", []);

saApp.controller('numberController', function($scope) {
    $scope.number = {
        number1: 0,
        number2: 0,
        sumIt: function() {
            var numObj;
            numObj = $scope.number;
            return parseInt(numObj.number1) +      parseInt(numObj.number2);
        }
    };
});

Additionally, here is an updated version of my HTML code:

<!doctype html>
<html>

<head>
    <script src = "https://ajax.googleapis.com/ajax/libs/angularjs/1.3.3/angular.min.js"></script>
    <script src="js/controllers.js" />
</head>

<body>

<div ng-app = "saApp" ng-controller="numberController">
<input type = "text" ng-model = "number.number1" placeholder = "Enter a number here">

<input type = "text" ng-model = "number.number2" placeholder = "Enter another number here">
{{number.number1}} + {{number.number2}} = {{number.sumIt()}}

</div>
</body>
</html>

javascript angularjs angularjs-controller

Answer 1

Answer №1

To start, make sure you have linked your application with your JS file. Update your tag to and update your controllers.js file accordingly.

<script>
var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope) {
    $scope.number = {
        number1: 0,
        number2: 0,
        sumIt: function() {
            var numberObject;
            numberObject = $scope.number;
            return parseInt(numberObject.number1) +      parseInt(numberObject.number2);
        }
    };
});
</script>

You can also access the console by right clicking with your mouse and selecting Inspect element.

Answer 2

To start, make sure you have linked your application with your JS file. Update your tag to and update your controllers.js file accordingly.

<script>
var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope) {
    $scope.number = {
        number1: 0,
        number2: 0,
        sumIt: function() {
            var numberObject;
            numberObject = $scope.number;
            return parseInt(numberObject.number1) +      parseInt(numberObject.number2);
        }
    };
});
</script>

You can also access the console by right clicking with your mouse and selecting Inspect element.

Answer 3

Answer №2

Hello! Here is an example of how you can write your program:

<!doctype html>
<html>

<head>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.5/angular.min.js"></script>
<script>
 angular.module("myapp", [])
    .controller("NumberController", function($scope, $http) {
       $scope.number = {
        number1: 0,
        number2: 0,
        sum:0,
        sumIt: function() {
            var numberObject;
            numberObject = $scope.number;
            this.sum = parseInt(numberObject.number1) + parseInt(numberObject.number2);
        }
    };
    } );
</script>
</head>
<body ng-app="myapp"> 
<div ng-controller="NumberController">
<input type = "text" ng-model = "number.number1" placeholder = "Enter a number here"/>

<input type = "text" ng-model = "number.number2" placeholder = "Enter another number here"/>
<input type = "button" ng-click="number.sumIt()" value="Sum"/>
sum is {{number.sum}}

</div>
</body>
</html>

Answer 4

Hello! Here is an example of how you can write your program:

<!doctype html>
<html>

<head>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.5/angular.min.js"></script>
<script>
 angular.module("myapp", [])
    .controller("NumberController", function($scope, $http) {
       $scope.number = {
        number1: 0,
        number2: 0,
        sum:0,
        sumIt: function() {
            var numberObject;
            numberObject = $scope.number;
            this.sum = parseInt(numberObject.number1) + parseInt(numberObject.number2);
        }
    };
    } );
</script>
</head>
<body ng-app="myapp"> 
<div ng-controller="NumberController">
<input type = "text" ng-model = "number.number1" placeholder = "Enter a number here"/>

<input type = "text" ng-model = "number.number2" placeholder = "Enter another number here"/>
<input type = "button" ng-click="number.sumIt()" value="Sum"/>
sum is {{number.sum}}

</div>
</body>
</html>

Answer 5

Answer №3

The issue at hand: you are currently utilizing an outdated method for declaring controllers. Starting from version 1.3, it is no longer possible to declare a controller using function <controller>.

To address this concern:

Step 1: Declare the application –

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

Step 2: Attach the controller

app.controller('numberController', ['$scope', function($scope) {

$scope.number = {
        number1: 0,
        number2: 0,

        sumIt: function() {
            var numberObject;
            numberObject = $scope.number;
            return parseInt(numberObject.number1) + parseInt(numberObject.number2);
        }
    };
}]);

I have created a jsfiddle for demonstration purposes.

Answer 6

The issue at hand: you are currently utilizing an outdated method for declaring controllers. Starting from version 1.3, it is no longer possible to declare a controller using function <controller>.

To address this concern:

Step 1: Declare the application –

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

Step 2: Attach the controller

app.controller('numberController', ['$scope', function($scope) {

$scope.number = {
        number1: 0,
        number2: 0,

        sumIt: function() {
            var numberObject;
            numberObject = $scope.number;
            return parseInt(numberObject.number1) + parseInt(numberObject.number2);
        }
    };
}]);

I have created a jsfiddle for demonstration purposes.

Answer 7

Answer №4

To start, you need to define the angular.module

<html ng-app="myApp">

Next, create your controller using the following syntax

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

myApp.controller('numberController', ['$scope', function($scope) {
   //Add your controller logic here
}]);

You can view a working example on codepen Here

Additional resources:
1 . Angular docs
2 . TutorialsPoint angular js

Answer 8

To start, you need to define the angular.module

<html ng-app="myApp">

Next, create your controller using the following syntax

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

myApp.controller('numberController', ['$scope', function($scope) {
   //Add your controller logic here
}]);

You can view a working example on codepen Here

Additional resources:
1 . Angular docs
2 . TutorialsPoint angular js

Answer 9

Answer №5

It seems like your code may be missing the definition of the app module. Referencing Angular documentation for guidance.

// app.js
    (function(angular) {
        angular.module('ngAppDemo', []).controller('NumberController', function($scope){
            $scope.number = {
                number1: 0,
                number2: 0,

                sumIt: function() {
                    var numberObject;
                    numberObject = $scope.number;
                    return parseInt(numberObject.number1) + parseInt(numberObject.number2);
                }
            };
        });
    })(window.angular);

You should note that the naming convention for Angular controllers is not being followed properly. The controller name should start with an uppercase letter, while the JavaScript function starts with a lowercase letter (e.g., function numberController() - ng-controller="NumberController")

Lastly, remember to include ng-app in the html or body tag and the controller on the div element.

<body ng-app="ngAppDemo">
    <div ng-controller="numberController">

Answer 10

It seems like your code may be missing the definition of the app module. Referencing Angular documentation for guidance.

// app.js
    (function(angular) {
        angular.module('ngAppDemo', []).controller('NumberController', function($scope){
            $scope.number = {
                number1: 0,
                number2: 0,

                sumIt: function() {
                    var numberObject;
                    numberObject = $scope.number;
                    return parseInt(numberObject.number1) + parseInt(numberObject.number2);
                }
            };
        });
    })(window.angular);

You should note that the naming convention for Angular controllers is not being followed properly. The controller name should start with an uppercase letter, while the JavaScript function starts with a lowercase letter (e.g., function numberController() - ng-controller="NumberController")

Lastly, remember to include ng-app in the html or body tag and the controller on the div element.

<body ng-app="ngAppDemo">
    <div ng-controller="numberController">

Answer 11

Answer №6

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

exampleApp.controller('mathController',  function($scope) {
   //$scope.math ={};
  $scope.math = {
        num1: 10,
        num2: 0,

        calculateSum: function() {
            var mathObject;
            mathObject = $scope.math;
            return parseInt(mathObject.num1) + parseInt(mathObject.num2);
        }
    };
  
});

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<!doctype html>
<html >

<head>
   
</head>

<body ng-app="exampleApp">

<div ng-controller="mathController">
<input type = "text" ng-model = "math.num1" placeholder = "Enter a number here">

<input type = "text" ng-model = "math.num2" placeholder = "Enter another number here">
{{math.num1}} + {{math.num2}} = {{math.calculateSum()}}


</div>
</body>
</html>

Answer 12

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

exampleApp.controller('mathController',  function($scope) {
   //$scope.math ={};
  $scope.math = {
        num1: 10,
        num2: 0,

        calculateSum: function() {
            var mathObject;
            mathObject = $scope.math;
            return parseInt(mathObject.num1) + parseInt(mathObject.num2);
        }
    };
  
});

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<!doctype html>
<html >

<head>
   
</head>

<body ng-app="exampleApp">

<div ng-controller="mathController">
<input type = "text" ng-model = "math.num1" placeholder = "Enter a number here">

<input type = "text" ng-model = "math.num2" placeholder = "Enter another number here">
{{math.num1}} + {{math.num2}} = {{math.calculateSum()}}


</div>
</body>
</html>

Answer 13

Answer №7

I made some changes to your code to make it compatible with the existing directory structure. Here is the updated JavaScript file :

var app = angular.module('myApp', []);
app.controller('numberController', function($scope) {

        $scope.number = {
        number1: 0,
        number2: 0,

        sumIt: function() {
            var numberObject;
            numberObject = $scope.number;
            return parseInt(numberObject.number1) + parseInt(numberObject.number2);
        }
    }; 

});

And here is the revised HTML code :

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

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

<body>
    <div ng-controller="numberController">

       <input type = "text" ng-model = "number.number1" placeholder = "Enter a number here">

       <input type = "text" ng-model = "number.number2" placeholder = "Enter another number here">

        {{number.number1}} + {{number.number2}} = {{number.sumIt()}}

    </div>

</body>
</html>

Answer 14

I made some changes to your code to make it compatible with the existing directory structure. Here is the updated JavaScript file :

var app = angular.module('myApp', []);
app.controller('numberController', function($scope) {

        $scope.number = {
        number1: 0,
        number2: 0,

        sumIt: function() {
            var numberObject;
            numberObject = $scope.number;
            return parseInt(numberObject.number1) + parseInt(numberObject.number2);
        }
    }; 

});

And here is the revised HTML code :

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

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

<body>
    <div ng-controller="numberController">

       <input type = "text" ng-model = "number.number1" placeholder = "Enter a number here">

       <input type = "text" ng-model = "number.number2" placeholder = "Enter another number here">

        {{number.number1}} + {{number.number2}} = {{number.sumIt()}}

    </div>

</body>
</html>

Answer 15

Answer №8

What do you think of this design:

<!DOCTYPE html>
<html ng-app="myApp">
<head>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.3.15/angular.min.js"></script>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>

  <div ng-controller="numberController as ctrl">
    <input type="number" ng-model="ctrl.number1" placeholder="Enter a number here">
    <br>
    <input type="number" ng-model="ctrl.number2" placeholder = "Enter another number here">
    <br>
    <div ng-if="ctrl.number1 && ctrl.number2">
      {{ctrl.number1}} + {{ctrl.number2}} = {{ctrl.sum(ctrl.number1, ctrl.number2)}}
    </div>
  </div>

</body>
</html>

Implementation using Javascript:

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

myApp.controller('numberController', function() {
  var vm = this;
  vm.number1 = null;
  vm.number2 = null;
  vm.sum = function(num1, num2) {
    return num1 + num2;
  };
});

Check out JS Bin example

It's recommended to utilize the 'controller as' syntax. In addition, consider utilizing a directive (or component if feasible on AngularJs 1.5) instead of employing ng-controller.

Answer 16

What do you think of this design:

<!DOCTYPE html>
<html ng-app="myApp">
<head>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.3.15/angular.min.js"></script>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>

  <div ng-controller="numberController as ctrl">
    <input type="number" ng-model="ctrl.number1" placeholder="Enter a number here">
    <br>
    <input type="number" ng-model="ctrl.number2" placeholder = "Enter another number here">
    <br>
    <div ng-if="ctrl.number1 && ctrl.number2">
      {{ctrl.number1}} + {{ctrl.number2}} = {{ctrl.sum(ctrl.number1, ctrl.number2)}}
    </div>
  </div>

</body>
</html>

Implementation using Javascript:

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

myApp.controller('numberController', function() {
  var vm = this;
  vm.number1 = null;
  vm.number2 = null;
  vm.sum = function(num1, num2) {
    return num1 + num2;
  };
});

Check out JS Bin example

It's recommended to utilize the 'controller as' syntax. In addition, consider utilizing a directive (or component if feasible on AngularJs 1.5) instead of employing ng-controller.

Answer 17

Answer №9

To implement this functionality in your controller:

let app = angular.module('myapp', []);

app.controller('numberController', function($scope) {
    $scope.number = {
        number1 : 0,
        number2 : 0,
        sumIt : function() {
            // you don't need to create a separate variable for $scope.number, just use it directly
            return parseInt($scope.number.number1) + parseInt($scope.number.number2);
        }
    };
});

Next, include the following HTML code:

<body ng-app="myapp">
    <div ng-controller="numberController">
        <input type="text" ng-model="number.number1" placeholder="Enter a number here"/>
        <br /><br />
        <input type="text" ng-model="number.number2" placeholder="Enter another number here"/>
        <br /><br />
        Total: {{number.sumIt()}}
    </div>
</body>

Finally, see the output here.

Answer 18

To implement this functionality in your controller:

let app = angular.module('myapp', []);

app.controller('numberController', function($scope) {
    $scope.number = {
        number1 : 0,
        number2 : 0,
        sumIt : function() {
            // you don't need to create a separate variable for $scope.number, just use it directly
            return parseInt($scope.number.number1) + parseInt($scope.number.number2);
        }
    };
});

Next, include the following HTML code:

<body ng-app="myapp">
    <div ng-controller="numberController">
        <input type="text" ng-model="number.number1" placeholder="Enter a number here"/>
        <br /><br />
        <input type="text" ng-model="number.number2" placeholder="Enter another number here"/>
        <br /><br />
        Total: {{number.sumIt()}}
    </div>
</body>

Finally, see the output here.

Struggling with creating a simple AngularJS controller

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Answer №6

Answer №7

Answer №8

Answer №9

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