Start With AngularJS: Part 3

Shiva Shukla
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Before reading this article, I highly recommend reading the previous part of the series:

Here we are reading scope & expression.

$Scope Inheritance

If you define nested controllers then child controller will inherit the $scope of its parent controller.

It has two types:

$root Scope: An app can have only one $root scope which will be shared among all the components of an app. It is available in the entire application. It acts like a global variable.
types of scope

Now you create your project.

Open old visual studio project.
Add new html file with name of inheritance.

Complete code
1. <!DOCTYPE html>
2. <html>
4. <head>
5. <title>Demo</title>
6. <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.3.14/angular.min.js">
7. </script>
8. <script>
9. var app = angular.module('app', []);
10. app.controller('AdminController', ['$scope', function ($scope)
11. {
12. $scope.Admin1name = 'Shiva';
13. $scope.Name = 'Shukla ';
14. }]);
15. app.controller('SalsemanController', ['$scope', function ($scope)
16. {
17. $scope.salsemanname = 'Rakesh';
18. $scope.Name = 'Kumar ';
19. }]);
20. app.controller('UserController', ['$scope', function ($scope)
21. {
22. $scope.Name = 'Rahul';
23. }]);
24. </script>
25. </head>
27. <body>
28. <p>Controller Inheritance</p>
29. <div ng-app="app" ng-controller="AdminController"> Admin1name : {{ Name }} {{ Admin1name }}
30. <div ng-controller="SalsemanController"> Salsemanname : {{ Name }} {{ salsemanname }} {{ Admin1name }}
31. <div ng-controller="UserController"> User name : {{ Name }} {{ salsemanname }} {{ Admin1name }} </div>
32. </div>
33. </div>
34. </body>
36. </html>
Output:

$Scope: $Scope is a JavaScript object that refers to the application model. It acts as glue between controller and view. $scope is passed as first argument to controller during its constructor definition.

Complete code

<!DOCTYPE html>
<html>
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js">
</script>
<script>
var app = angular.module('myApp', []);
app.controller('myCtrl', function ($scope)
{
$scope.Adminname = "Shiva";
});
</script>
<body>
<div ng-app="myApp" ng-controller="myCtrl">
<h1>{{Adminname}}</h1> </div>
</body>
</html>

Output

Output

Expression

Expressions are used to bind application data to HTML. AngularJS expressions can be written inside double braces: {{expression}}. It used for bindings to insert dynamic values into the html pages.

Complete code

<!DOCTYPE html>
<html>
<head>
<title>Expression Demo</title>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.3.14/angular.min.js">
</script>
</head>
<body>
<div ng-app>
<h2>Expressions in AngularJS</h2> The sum of 2 + 5 is = <strong>{{2 + 5}}</strong>. </div>
</body>
</html>

Output

run

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