In AngularJS, __________ is used to watch for changes in scope variables and update the view accordingly.
- $apply
- $digest
- $observe
- $watch
In AngularJS, $watch is used to watch for changes in scope variables and update the view accordingly. It allows developers to track changes in model data and trigger the necessary updates in the UI. Understanding how to use $watch is crucial for building dynamic and responsive AngularJS applications.
To optimize performance, AngularJS controllers should handle events using __________ instead of traditional JavaScript methods.
- Angular Services
- Event Delegation
- Observables
- WebSockets
To optimize performance, AngularJS controllers should handle events using Observables instead of traditional JavaScript methods. Observables provide a powerful and efficient way to handle asynchronous events, making it easier to manage and react to changes in the application. This is a key concept in AngularJS that enhances the overall responsiveness and performance of the application.
How does the ng-repeat directive function in AngularJS?
- It creates a new instance of the element for each item in a collection.
- It generates a table for each item in a collection.
- It repeats a block of HTML code for each item in a collection.
- It repeats the entire page for each item in a collection.
The ng-repeat directive in AngularJS is used to repeat a block of HTML code for each item in a collection. It is particularly useful for rendering lists and tables dynamically based on the data provided. Understanding how ng-repeat works is essential for efficiently displaying data in AngularJS applications and making the UI responsive to changes in the underlying data.
What is the primary purpose of event handlers in AngularJS controllers?
- Control data flow
- Define routing paths
- Handle HTTP requests
- Manage user interactions
The primary purpose of event handlers in AngularJS controllers is to manage user interactions. Event handlers in controllers respond to user input, such as button clicks or form submissions, and trigger appropriate actions in the application. By handling events, controllers play a crucial role in updating the model and view, ensuring a responsive and interactive user experience in AngularJS applications.
$scope's __________ feature allows for the automatic synchronization of data between the model and the view.
- dataBinding
- syncBinding
- twoWayBinding
- watch
$scope's twoWayBinding feature allows for the automatic synchronization of data between the model and the view. Two-way data binding in AngularJS enables a seamless connection between the model and the view, so changes in one automatically reflect in the other and vice versa. Understanding two-way data binding is fundamental for building dynamic and responsive user interfaces in AngularJS applications.
Describe a use case for a custom directive in AngularJS that manipulates DOM elements based on specific conditions.
- Building a Form Validation Directive
- Creating a Tooltip Directive
- Implementing Infinite Scrolling Directive
- Implementing Lazy Loading with a Directive
A use case for a custom directive in AngularJS that manipulates DOM elements based on specific conditions could be "Implementing Lazy Loading with a Directive." In this scenario, you can create a custom directive to load content dynamically as the user scrolls, improving the performance of the web page. Custom directives in AngularJS provide a powerful mechanism for extending the functionality of the framework to meet specific requirements. Understanding how to create and use custom directives is crucial for advanced AngularJS development.
When integrating with an external API in AngularJS, what format is typically used for data exchange?
- HTML
- JSON
- XML
- YAML
When integrating with an external API in AngularJS, the typical format used for data exchange is JSON (JavaScript Object Notation). JSON is a lightweight and readable data interchange format that is easy to work with in JavaScript applications. AngularJS developers often parse JSON responses from APIs and format data as JSON when making requests, ensuring compatibility and efficient data transfer.
How does AngularJS handle data binding within expressions?
- Dynamic data binding
- Event-based data binding
- One-time data binding
- Two-way data binding
AngularJS handles data binding within expressions through two-way data binding. Two-way data binding enables automatic synchronization of the model and view, allowing changes in one to instantly reflect in the other and vice versa. This feature simplifies the development process by reducing the need for manual updates and enhancing the responsiveness of AngularJS applications. Understanding how two-way data binding works is crucial for efficient data management in AngularJS.
The __________ feature in AngularJS allows for dynamic loading and rendering of views based on application state.
- Data Binding
- Dependency Injection
- Modules
- Routing
The Routing feature in AngularJS allows for dynamic loading and rendering of views based on application state. AngularJS provides a powerful routing mechanism that enables developers to define routes, associate them with templates and controllers, and navigate between different views. Proper usage of routing enhances the structure and navigation flow of AngularJS applications, making it a fundamental concept for building single-page applications (SPAs).
In advanced AngularJS applications, _________ is used for controller aliasing to enhance readability.
- as-controller
- controller-as
- ng-alias
- ng-controller
In advanced AngularJS applications, "controller-as" syntax is used for controller aliasing to enhance readability. It allows you to avoid scope-related issues and makes it clear which controller is associated with a particular section of the view. The "controller-as" syntax is considered a best practice for maintaining clean and readable code in AngularJS.