AngularJS
Controllers
It is responsible to control the data
or in other word, AngularJS controller is used to manage the flow of data of
AngularJS application. ng-controller
directive define the controller class to view. Attributes/properties and
functions can be define in a controller. AngularJS invokes the controller with
a $scope object.
AngularJS
variable Example:-
<!DOCTYPE html>
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>
</head>
<body>
<div ng-app="myApp" ng-controller="TestController">
Name: <input type="text" ng-model="name"><br>
Address: <input type="text" ng-model="address"><br>
<br>
<p>Name: {{name}} </p>
<p>Addess: {{address}} </p>
</div>
<script>
var myapp = angular.module('myApp', []);
myapp.controller('TestController', function ($scope) {
$scope.name = "Alok";
$scope.address = "Delhi";
});
</script>
</body>
</html>
AngularJS
variables as functions Example:-
<!DOCTYPE html>
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>
</head>
<body>
<div ng-app="myApp" ng-controller="TestController">
First Name: <input type="text" ng-model="firstname"><br>
Last Name: <input type="text" ng-model="lastname"><br>
Address: <input type="text" ng-model="address">
<br>
<p>Name: {{fullname()}} </p>
<p>Addess: {{address}} </p>
</div>
<script>
var myapp = angular.module('myApp', []);
myapp.controller('TestController', function ($scope) {
$scope.firstname = "Alok";
$scope.address = "Delhi";
$scope.lastname = "Singh"
$scope.fullname = function () {
return $scope.firstname + " " + $scope.lastname;
};
});
</script>
</body>
</html>
Remark:-
1:-
Above code runs from root element define by “ng-app”
2:-
ng-controller defines the controller object for an application.
3:-
AngularJS
will invoke the controller with a $scope object.
4:-
we can define variable, function and assign it to scope that will invoke on
view.
5:-
You can use ng-model to perform two-way binding that reflect model if any
changes occurs.
Use
controllers to:
1:- Set up the initial state of the
$scope object.
2:- Add behaviour to the $scope
object.
Do
not use controllers to:
1:- Format input
2:- Manipulate DOM
3:- Filter output
4:- Share code or state across controllers
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