Modules and controller is an important part of the AngularJS application.
A module is a container where functionality of the application is defined.
Controller belongs to the module where all logical part is done and updates the views.
Contents
1. Modules
A module is a container for different parts of your application.
You may think modules as a main() function in C programming, which bind together different parts of the application.
Define module
angular.modules() method to create module.
var myApp = angular.modules('myModule',[]);
- The first parameter specifies the name of the module which associates with
ng-appvalue and - Another parameter specify the dependencies. If there is no dependencies you can set empty square brackets
[].
Example
<html lang="en" >
<head>
<meta charset="UTF-8">
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.7/angular.min.js" type="text/javascript"></script>
</head>
<body ng-app="myApp">
<script>
var application = angular.module('myLanguageApp',[]);
</script>
</body>
</html>
2. Controller
Controllers is a JavaScript constructor functions which are bound to a particular scope.
With angular.controller method controller is defined which allows us to bind controller to the module. It takes controller name and a function.
To access or update the value of model or a property $scope is been used in the controller.
Example
Define ng-controller='lang' on a <div> and in the <div> added {{ language }}. The value of language is assigned from the controller function.
To assign value in language use $scope.
$scope.language = "AngularJS";
Completed Code
<html lang="en" >
<head>
<meta charset="UTF-8">
<title>Controller example</title>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.7/angular.min.js" type="text/javascript"></script>
</head>
<body ng-app="myLanguageApp">
<div ng-controller="lang">
{{ language }}
</div>
<script>
var application = angular.module('myLanguageApp',[]);
var myController = function($scope){
$scope.language = "AngularJS";
};
application.controller("lang",myController);
</script>
</body>
</html>
Output
3. Using controller with ng-click
The ng-click directive represents click event in Angular.
Pass the method which you want to call on the click.
Example
I create a simple example where use the ng-click directive on the buttons to update the view with the controller.
Define ng-click="lang()" on the buttons where pass different values from each button.
Create lang() method in the script which is called on the button click. Assign the value in $scope.myFavLanguage.
The view is updated with the clicked button value.
Completed Code
<html lang="en" >
<head>
<meta charset="UTF-8">
<title>Controller example</title>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.7/angular.min.js" type="text/javascript"></script>
</head>
<body ng-app="myLanguageApp">
<div ng-controller="languages">
Select your Favourite Lanuage :
<button ng-click="lang('php programming')">PHP</button>
<button ng-click="lang('javascript')">Javascript</button>
<button ng-click="lang('python')">Python</button>
<button ng-click="lang('ruby')">Ruby</button>
<p>You have selected : {{ myFavLanguage }}</p>
</div>
<script>
var application = angular.module('myLanguageApp',[]);
application.controller('languages',function($scope){
$scope.myFavLanguage = "None";
$scope.lang = function(value){
$scope.myFavLanguage = value;
}
});
</script>
</body>
</html>
Output
