What is Scope and Scope Inheritance


What is scope - Scope is plain java script object. Scope is glue between view and controller. A controller is responsible for setting of model and functions. Model define in scope are accessible on view (html). Its work in two-way bindings. when model updated on scope it automatically refresh on view that's way its also called two-way binding.

Scope Inheritance - AngularJs Scope Inheritance work similar to JavaScript Inheritance. By default Child scope inherit parent scope. scope can be nested. Scope inheritance used for creating reusable component directive.

Code - http://plnkr.co/edit/wBAtJ8?p=preview








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<html>
 
<head>
  <title>What is Scope and Scope Inheritance?</title>
  <script>
    var myApp = angular.module("myScopeApp", []);
 
    myApp.controller("LocationController", function($scope) {
      $scope.Country = 'India';
      $scope.Location = 'Mumbai';
 
    });
 
    myApp.controller("ProfileController", function($scope) {
 
      $scope.Name = 'Sachin';
      $scope.Age = 10;
      $scope.Location = 'Navi Mumbai';
 
    });
 
    myApp.controller("JobController", function($scope) {
 
      $scope.Job = 'Software Engineer';
      $scope.Company = 'Company A';
      $scope.Location = 'Noida';
 
    });
  </script>
</head>
 
<body ng-app="myScopeApp">
  <h2>Scope Inheritance?</h2>
  <div ng-controller="LocationController">
    <strong> User Profile </strong>
    <p>{{Country}} - {{Location}}</p>
 
    <div ng-controller="ProfileController">
      <p><strong> Name </strong >- {{Name}}
        <br/><strong> Age </strong>- {{Age}}
        <br/><strong>Location </strong> - {{Location}}
        <!-- local scope-->
 
        , {{$parent.Location}}
        <!--  inherit from parent scope -->
 
        , {{Country }}
        <!--  country not avaliable in local scope then
it will inherit from parent scope -->
 
    </div>
 
    <div ng-controller="JobController">
      <p><strong> Job </strong> - {{Job}} , {{Location}} ,
        <!-- local scope-->
        {{Country}}
        <!-- local scope-->
        <br/>
      </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 myApp = angular.module("myScopeApp", []);

    myApp.controller("LocationController", function($scope) {
      $scope.Country = 'India';
      $scope.Location = 'Mumbai';

    });

    myApp.controller("ProfileController", function($scope) {

      $scope.Name = 'Sachin';
      $scope.Age = 10;
      $scope.Location = 'Navi Mumbai';

    });

    myApp.controller("JobController", function($scope) {

      $scope.Job = 'Software Engineer';
      $scope.Company = 'Company A';
      $scope.Location = 'Noida';

    });
  </script>
</head>

<body ng-app="myScopeApp">
  <h2>Scope Inheritance?</h2>
  <div ng-controller="LocationController">
    <strong> User Profile </strong>
    <p>{{Country}} - {{Location}}</p>

    <div ng-controller="ProfileController">
      <p><strong> Name </strong >- {{Name}}
        <br/><strong> Age </strong>- {{Age}}
        <br/><strong>Location </strong> - {{Location}}
        <!-- local scope-->

        , {{$parent.Location}}
        <!--  inherit from parent scope -->

        , {{Country }}
        <!--  country not avaliable in local scope then 
it will inherit from parent scope -->

    </div>

    <div ng-controller="JobController">
      <p><strong> Job </strong> - {{Job}} , {{Location}} ,
        <!-- local scope-->
        {{Country}}
        <!-- local scope-->
        <br/>
      </p>
    </div>

  </div>
</body>

</html>
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