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>
    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>

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

Popular posts from this blog

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

25 Best Vue.js 2 Interview Questions and Answers

What Is Vue.js? The Vue.js is a progressive JavaScript framework and used to building the interactive user interfaces and also it’s focused on the view layer only (front end). The Vue.js is easy to integrate with other libraries and others existing projects. Vue.js is very popular for Single Page Applications developments. The Vue.js is lighter, smaller in size and so faster. It also supports the MVVM ( Model-View-ViewModel ) pattern. The Vue.js is supporting to multiple Components and libraries like - ü   Tables and data grids ü   Notifications ü   Loader ü   Calendar ü   Display time, date and age ü   Progress Bar ü   Tooltip ü   Overlay ü   Icons ü   Menu ü   Charts ü   Map ü   Pdf viewer ü   And so on The Vue.js was developed by “ Evan You ”, an Ex Google software engineer. The latest version is Vue.js 2. The Vue.js 2 is very similar to Angular because Evan You was inspired by Angular and the Vue.js 2 components looks like -

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 '

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 SALVADOR

React | Encryption and Decryption Data/Text using CryptoJs

To encrypt and decrypt data, simply use encrypt () and decrypt () function from an instance of crypto-js. Node.js (Install) Requirements: 1.       Node.js 2.       npm (Node.js package manager) 3.       npm install crypto-js npm   install   crypto - js Usage - Step 1 - Import var   CryptoJS  =  require ( "crypto-js" ); Step 2 - Encrypt    // Encrypt    var   ciphertext  =  CryptoJS . AES . encrypt ( JSON . stringify ( data ),  'my-secret-key@123' ). toString (); Step 3 -Decrypt    // Decrypt    var   bytes  =  CryptoJS . AES . decrypt ( ciphertext ,  'my-secret-key@123' );    var   decryptedData  =  JSON . parse ( bytes . toString ( CryptoJS . enc . Utf8 )); As an Example,   import   React   from   'react' ; import   './App.css' ; //Including all libraries, for access to extra methods. var   CryptoJS  =  require ( "crypto-js" ); function   App () {    var   data