What is the reason behind suggesting to avoid using $scope.attribute and instead favor $scope.model.attribute in AngularJS?

Question

What is the reason behind suggesting to avoid using $scope.attribute and instead favor $scope.model.attribute in AngularJS?

While studying the ng-book, there is a section that recommends encapsulating attributes within another attribute when using the $scope, as shown below:

$scope.model.attribute instead of $scope.attribute

The author points out that this practice is beneficial when dealing with nested controllers because if we don't follow this approach, changes made in the child $scope will not reflect in the parent $scope.

I am struggling to grasp why this is necessary. What sets $scope.model.attribute apart from $scope.attribute in terms of prototypal inheritance?

javascript angularjs prototypal-inheritance

Answer 1

Answer №1

To better understand the problem at hand, please take a look at the fiddle I created.

http://jsfiddle.net/nicolasmoise/X9KYU/4/

Here is the HTML code snippet:

<body ng-app="myApp">
<div ng-controller="parentCtrl">
    <!--{{message}}<input type="text" ng-model="message">-->
    {{obj.message}}<input type="text" ng-model="obj.message">
    <div ng-controller="childCtrl">
        <!--{{message}}<input type="text" ng-model="message">-->        
        {{obj.message}}<input type="text" ng-model="obj.message">
    </div>
</div>    
</body>

And here is the controller code:

//Switch between commented/uncommented

angular.module('myApp', [])
.controller('parentCtrl', ['$scope', function($scope){
    //$scope.message="Hello";
    $scope.obj={message:"Hello"}
}])
.controller('childCtrl', ['$scope', function($scope){
}]);

If you manipulate a "primitive" variable like $scope.message in the child controller, it will not affect the value in the parent controller.

It is all related to the concept of Javascript's prototypical inheritance.

Answer 2

To better understand the problem at hand, please take a look at the fiddle I created.

http://jsfiddle.net/nicolasmoise/X9KYU/4/

Here is the HTML code snippet:

<body ng-app="myApp">
<div ng-controller="parentCtrl">
    <!--{{message}}<input type="text" ng-model="message">-->
    {{obj.message}}<input type="text" ng-model="obj.message">
    <div ng-controller="childCtrl">
        <!--{{message}}<input type="text" ng-model="message">-->        
        {{obj.message}}<input type="text" ng-model="obj.message">
    </div>
</div>    
</body>

And here is the controller code:

//Switch between commented/uncommented

angular.module('myApp', [])
.controller('parentCtrl', ['$scope', function($scope){
    //$scope.message="Hello";
    $scope.obj={message:"Hello"}
}])
.controller('childCtrl', ['$scope', function($scope){
}]);

If you manipulate a "primitive" variable like $scope.message in the child controller, it will not affect the value in the parent controller.

It is all related to the concept of Javascript's prototypical inheritance.

What is the reason behind suggesting to avoid using $scope.attribute and instead favor $scope.model.attribute in AngularJS?

Answer №1

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