Skip to main content

What are scope and scope inheritance?

Scope :  Click for live demo

The scope is an object of JavaScript. The scope is provide the connection between controller to view. The model data contain by the scope and all the model data access by the $scope. i.e.
//assign value in scope and access it.
var parentApp = angular.module("myParentApp", []);
 parentApp.controller("MyParentController", ['$scope', function ($scope) {
    $scope.name = 'Anil Singh';
    $scope.Age = 30;
  }
}]);
//assign value in scope and access it.
var parentApp = angular.module("myParentApp", []);

 parentApp.controller("MyParentController", ['$scope', function ($scope) {
    $scope.name = 'Anil Singh';
    $scope.Age = 30;
  }
}]);
Scope Inheritance :

The Scope Inheritance work like JavaScript Inheritance. The parent scope and child scope attached with taggers.

By default, The child scope prototype inherit from the parent scope that means the child controller will inherit the parent controller and the scope can be nested and have the limit access to the properties. i.e.
var parentApp = angular.module("myParentApp", []);
parentApp.controller("MyChild1Controller", ['$scope', function ($scope) {
    $scope.child1Name = 'Child-1';
    $scope.Age = 10;
    $scope.gender = 'M';
  }
}]);
parentApp.controller("MyChild2Controller", ['$scope', function ($scope) {
    $scope.child2Name = 'Child-2';
    $scope.Age = 4;
    $scope.gender = 'F';
  }
}]);
var parentApp = angular.module("myParentApp", []);

parentApp.controller("MyChild1Controller", ['$scope', function ($scope) {
    $scope.child1Name = 'Child-1';
    $scope.Age = 10;
    $scope.gender = 'M';
  }
}]);

parentApp.controller("MyChild2Controller", ['$scope', function ($scope) {
    $scope.child2Name = 'Child-2';
    $scope.Age = 4;
    $scope.gender = 'F';
  }
}]);
The live example of scope with Inheritance
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
<html>
<head>
  <title>What is Scope and Scope Inheritance?</title>
  <script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.2.15/angular.min.js"></script>
  <script>
    var parentApp = angular.module("myParentApp", []);
    parentApp.controller("MyParentController", function($scope) {
      $scope.ParentName = 'Parent';
      $scope.Age = 50;
    });
    parentApp.controller("MyChild1Controller", function($scope) {
      $scope.child1Name = 'Child-1';
      $scope.Age = 10;
      $scope.gender = 'M';
    });
    parentApp.controller("MyChild2Controller", function($scope) {
      $scope.child2Name = 'Child-2';
      $scope.Age = 4;
      $scope.gender = 'F';
    });
  </script>
</head>
<body ng-app="myParentApp">
  <h2>Scope Inheritance?</h2>
  <div ng-controller="MyParentController">
    <p>{{ParentName}}
      <br/>{{Age}}
      <div ng-controller="MyChild1Controller">
        <p>{{child1Name}}
          <br/>{{Age}}</p>
      </div>
      <div ng-controller="MyChild2Controller">
        <p>{{child2Name}}
          <br/>{{Age}}</p>
      </div>
  </div>
</body>
</html>
<html>

<head>
  <title>What is Scope and Scope Inheritance?</title>
  <script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.2.15/angular.min.js"></script>
  <script>
    var parentApp = angular.module("myParentApp", []);

    parentApp.controller("MyParentController", function($scope) {
      $scope.ParentName = 'Parent';
      $scope.Age = 50;
    });

    parentApp.controller("MyChild1Controller", function($scope) {
      $scope.child1Name = 'Child-1';
      $scope.Age = 10;
      $scope.gender = 'M';
    });

    parentApp.controller("MyChild2Controller", function($scope) {
      $scope.child2Name = 'Child-2';
      $scope.Age = 4;
      $scope.gender = 'F';
    });
  </script>
</head>

<body ng-app="myParentApp">
  <h2>Scope Inheritance?</h2>
  <div ng-controller="MyParentController">
    <p>{{ParentName}}
      <br/>{{Age}}
      <div ng-controller="MyChild1Controller">
        <p>{{child1Name}}
          <br/>{{Age}}</p>
      </div>
      <div ng-controller="MyChild2Controller">
        <p>{{child2Name}}
          <br/>{{Age}}</p>
      </div>
  </div>
</body>

</html>

Labels

Labels:
By Anil Singh | Rating of this article (*****)

Popular posts from this blog

nullinjectorerror no provider for httpclient angular 17

In Angular 17 where the standalone true option is set by default, the app.config.ts file is generated in src/app/ and provideHttpClient(). We can be added to the list of providers in app.config.ts Step 1:   To provide HttpClient in a standalone app we could do this in the app.config.ts file, app.config.ts: import { ApplicationConfig } from '@angular/core'; import { provideRouter } from '@angular/router'; import { routes } from './app.routes'; import { provideClientHydration } from '@angular/platform-browser'; //This (provideHttpClient) will help us to resolve the issue  import {provideHttpClient} from '@angular/common/http'; export const appConfig: ApplicationConfig = {   providers: [ provideRouter(routes),  provideClientHydration(), provideHttpClient ()      ] }; The appConfig const is used in the main.ts file, see the code, main.ts : import { bootstrapApplication } from '@angular/platform-browser'; import { appConfig } from ...
Read more

Top 15+ Angular 17 Interview Questions Answers | For Experienced Professionals as well

G Google team released the latest version of Angular – Angular 17 on November 6, 2023, creating a significant milestone for the super fast front-end development. What Are the New Features in Angular 17? 1.       Angular 17 is the highly anticipated release for the community, bringing many new exciting features, updates, and improvements. 2.       New Syntax for Control Flow in Templates - new @if, @switch, @for, @case, @empty @end control flow syntax 3.       Deferred Loading - @defer partial template 4.       The Angular signals API 5.       Angular SSR and client hydration 6.       Automatic Migration to Build-in Control Flow 7.       Build Performance with ESBuild 8.       By default, set this newly generated component as a standalone, and now we don't have an app module file. To use (ng...
Read more

SOLID-Liskov Substitution Principle (LSP) Real-Time Example in C#

The SOLID Principles are the design principles that enable us to manage several software design problems. These principles provide us with ways to move from tightly coupled code to loosely coupled and encapsulated real business needs properly. Also readable, adaptable, and scalable code. The SOLID Principles  guide developers as they write readable, adaptable, and scalable code or design an application. The SOLID Principles can be applied to any OOP program. The SOLID Principles were developed by computer science instructor and author Robert C. Martin. Now, SOLID principles have also been adopted in both agile development and adaptive software development. The 5 principles of SOLID are: 1.       Single Responsibility Principle (SRP) 2.       Open-Closed Principle (OCP) 3.       Liskov Substitution Principle (LSP) 4.       Interface Segregation Principle (ISP) 5. ...
Read more

List of Countries, Nationalities and their Code In Excel File

Download JSON file for this List - Click on JSON file    Countries List, Nationalities and Code Excel ID Country Country Code Nationality Person 1 UNITED KINGDOM GB British a Briton 2 ARGENTINA AR Argentinian an Argentinian 3 AUSTRALIA AU Australian an Australian 4 BAHAMAS BS Bahamian a Bahamian 5 BELGIUM BE Belgian a Belgian 6 BRAZIL BR Brazilian a Brazilian 7 CANADA CA Canadian a Canadian 8 CHINA CN Chinese a Chinese 9 COLOMBIA CO Colombian a Colombian 10 CUBA CU Cuban a Cuban 11 DOMINICAN REPUBLIC DO Dominican a Dominican 12 ECUADOR EC Ecuadorean an Ecuadorean 13 EL SALVA...
Read more

39 Best Object Oriented JavaScript Interview Questions and Answers

Most Popular 37 Key Questions for JavaScript Interviews. What is Object in JavaScript? What is the Prototype object in JavaScript and how it is used? What is "this"? What is its value? Explain why "self" is needed instead of "this". What is a Closure and why are they so useful to us? Explain how to write class methods vs. instance methods. Can you explain the difference between == and ===? Can you explain the difference between call and apply? Explain why Asynchronous code is important in JavaScript? Can you please tell me a story about JavaScript performance problems? Tell me your JavaScript Naming Convention? How do you define a class and its constructor? What is Hoisted in JavaScript? What is function overloadin...
Read more