JavaScript Angular scope binding angular scope binding symbols,angularjs scope binding directive,angularjs scope

In AngularJS, scopes use prototypical inheritance from their parents.

Prototypical inheritance basically means that JavaScript will look at the parent scope if it doesn't find a property on the child scope.

So, when you do $scope.person.name = 'Ari Lerner', JavaScript looks at $scope, sees that it doesn't have a person property, then goes to its parent (the parent scope), sees that it has a person property, and assigns the name property of that to 'Ari'.

On the other hand, when you do $scope.person = { ... }, JavaScript doesn't care if the property exists or not - it simply carries out the assignment, ensuring that your $scope now has a person property. The problem here is that your child scope's person property now shadows the person property of the parent scope, which still has its original value. So, in the parent controller, person never changed.

For further reading, check this answer here:

What are the nuances of scope prototypal / prototypical inheritance in AngularJS?

Answer:1

You are creating a child scope that prototypically inherits from its parent scope. This is the case unless you are using an isolate scope (directive).

For a really great explanation, see here What are the nuances of scope prototypal / prototypical inheritance in AngularJS?

Answer:2

As others stated, this is because of your scopes.

For example, if you want to create a new object in your childScope, you do $scope.someObject = {};. Now, JavaScript can't know the difference between

$scope.someNewObject = {};

and

$scope.person = {};

because you are just assigning a new object to your childscope. The other notation works, because by grabbing $scope.person.attribute = ... JavaScript knows, that the person object already exists. It starts looking for this object in your childscope, can't find it there, goes to parentscope and finds it there and sets the attribute.

In conclusion you either have to use $scope.person.attribute, or you use $scope.$parent.person = {};

Answer:3

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