What differentiates structural directives from attribute directives in AngularJS?
- Attribute directives are primarily used for form validation.
- Attribute directives modify the appearance or behavior of an existing element.
- Structural directives are used for two-way data binding.
- Structural directives control the structure of the DOM by adding or removing elements.
Structural directives in AngularJS, such as *ngIf and *ngFor, control the structure of the DOM by adding or removing elements based on certain conditions. They can alter the layout of the page and dynamically change the structure of the view. Understanding the distinction between structural and attribute directives is crucial for effective template manipulation in AngularJS applications.
In a large AngularJS application, how does modularization and dependency injection facilitate code maintenance and scalability?
- By ignoring modularity and avoiding dependency injection
- By increasing code duplication and enforcing tight coupling
- By limiting code organization and hindering scalability
- By reducing code coupling and promoting reusability
Modularization and dependency injection in AngularJS facilitate code maintenance and scalability by reducing code coupling and promoting reusability. Modularization helps in organizing code into separate modules, while dependency injection allows components to be loosely coupled, making it easier to manage and scale the application. Understanding these concepts is crucial for building scalable and maintainable AngularJS applications.
How do you define a controller in an AngularJS application?
- By creating a separate JavaScript file
- Defining it within the HTML markup
- Using the controller keyword
- Using the service keyword
In AngularJS, controllers are defined using the controller keyword. This can be done within the HTML markup or in a separate JavaScript file, depending on the application's structure. Defining controllers helps organize the code and encapsulate the logic related to a specific part of the application. Knowing the correct syntax and usage of the controller keyword is essential for proper implementation in AngularJS projects.
AngularJSâs ________ method in the $http service is used to make a POST request to an external API.
- post
- request
- send
- submit
AngularJS's post method in the $http service is used to make a POST request to an external API. This method is crucial for sending data to a server, such as submitting a form or creating a new resource. Understanding how to use the post method is essential for handling data communication in AngularJS applications.
Describe a situation where using AngularJS expressions within HTML attributes enhances user interaction and experience.
- All of the above.
- Embedding expressions in HTML class attributes for conditional styling.
- Using AngularJS expressions in event handlers to dynamically update UI elements.
- Using expressions in form validation for real-time feedback.
Using AngularJS expressions within HTML attributes, such as event handlers, class attributes, and form validation, can enhance user interaction and experience. These expressions allow developers to create dynamic and responsive user interfaces. For example, updating UI elements based on user actions, dynamically applying styles, and providing real-time feedback in forms contribute to a more engaging and user-friendly experience. This understanding is crucial for leveraging AngularJS expressions effectively in different scenarios.
In AngularJS, where should the business logic ideally be placed?
- Controller
- Model
- Service
- View
In AngularJS, the business logic should ideally be placed in a Service. Services are responsible for encapsulating and organizing business logic, data manipulation, and other functionalities that are not directly related to the view or user interactions. By placing business logic in services, AngularJS promotes reusability, maintainability, and testability of code. Understanding the role of services is key to building scalable and modular AngularJS applications.
What is the primary method used in AngularJS for integrating with external APIs?
- $http service
- ajax() method
- externalAPI() function
- fetch() function
The primary method used in AngularJS for integrating with external APIs is the $http service. AngularJS provides the $http service as a convenient way to make HTTP requests, allowing developers to communicate with external APIs and retrieve or send data. Understanding how to use the $http service is crucial for building AngularJS applications that interact with external data sources.
Which AngularJS service is commonly used for making HTTP requests to external APIs?
- $ajax service
- $fetch service
- $http service
- $request service
The AngularJS service commonly used for making HTTP requests to external APIs is the $http service. It abstracts the complexities of making AJAX requests and provides a straightforward API for sending GET, POST, and other types of HTTP requests. Developers use the $http service to interact with external APIs and handle data exchange seamlessly in AngularJS applications.
How does AngularJS handle DOM manipulations in the context of two-way data binding?
- Automatic DOM Updates
- Manual DOM Updates
- Shadow DOM
- Virtual DOM
AngularJS handles DOM manipulations in the context of two-way data binding by automatically updating the DOM when the underlying data changes. It establishes a bidirectional connection between the model and the view, allowing changes in one to reflect in the other and vice versa. This is achieved through the use of watchers and a digest cycle that efficiently updates only the parts of the DOM affected by the data changes. Understanding this mechanism is crucial for building responsive and dynamic user interfaces in AngularJS.
How does two-way data binding in AngularJS facilitate the implementation of reactive user interfaces?
- Automatic UI Updates
- Data-Driven Components
- Real-Time Data Sync
- Simplified Event Handling
Two-way data binding in AngularJS facilitates the implementation of reactive user interfaces by automatically updating the user interface (UI) in response to changes in the underlying data. When the model changes, the view is automatically updated, and vice versa. This eliminates the need for manual DOM manipulation and event handling, making it easier to create reactive and dynamic UIs. Understanding this aspect of two-way data binding is crucial for building modern and responsive user interfaces in AngularJS.