How does the $scope object facilitate the interaction between the view and the controller?
- Acts as a Glue
- Handles User Input
- Manages View Rendering
- Provides a Data Model
The $scope object in AngularJS facilitates the interaction between the view and the controller by acting as a glue. It serves as a context for evaluating expressions, and any changes made to the $scope object in the controller are automatically reflected in the view. This two-way data binding enables seamless communication between the controller and the view, simplifying the development process in AngularJS.
How is $scope used in conjunction with AngularJS directives?
- It binds DOM elements to controller methods
- It is a jQuery function for selecting DOM elements
- It is used to define global variables in AngularJS
- It provides a way to link controller and view in AngularJS
In AngularJS, $scope is used to establish a connection between the controller and the view. It allows controller properties and methods to be accessible in the associated view. When a directive is used, $scope serves as a bridge, enabling communication between the controller and the directive. Understanding the usage of $scope is crucial for effective data binding and interaction between controllers and views in AngularJS applications.
How does scope $digest cycle work in AngularJS for updating the view?
- It iterates through all the watches and updates the model accordingly
- It only updates the watches registered with $digest
- It updates the model and view simultaneously
- It updates the view directly without involving watches
The scope $digest cycle in AngularJS works by iterating through all the watches registered with the scope. During each iteration, it checks for changes in the model and updates the corresponding watches. This process continues until no more changes are detected. Understanding the $digest cycle is crucial for developers to optimize performance and avoid potential issues related to data binding and updating the view.
AngularJS uses the __________ directive to include external HTML fragments into the view.
- ng-embed
- ng-external
- ng-import
- ng-include
AngularJS uses the ng-include directive to include external HTML fragments into the view. This directive allows you to dynamically load and insert content from separate HTML files, promoting modularity and code reuse in AngularJS applications. Understanding how to use ng-include is crucial for building modular and maintainable user interfaces.
Describe how $scope inheritance works in nested controllers.
- Child controllers inherit from parent controllers, creating a scope hierarchy
- Inheritance is not supported in AngularJS controllers
- Nested controllers have independent scopes with no inheritance
- Parent controllers inherit from child controllers
In AngularJS, $scope inheritance works in nested controllers by establishing a hierarchy. Child controllers inherit from their parent controllers, creating a chain of scopes. This means that the child controller can access properties and methods defined in its parent controller's $scope. However, changes made in the child controller's $scope do not affect the parent controller's $scope. Understanding $scope inheritance is crucial for managing data flow and communication between nested controllers in AngularJS applications.
The _________ directive is used for rendering a set of HTML elements based on an array of items.
- ng-for
- ng-if
- ng-repeat
- ng-show
The ng-repeat directive in AngularJS is used for rendering a set of HTML elements based on an array of items in the scope. It iterates over the array, creating a copy of the HTML elements for each item. This is powerful for dynamic content generation and displaying lists of data. Mastering ng-repeat is essential for efficiently working with arrays and collections in AngularJS applications.