What does 'MVC' stand for in AngularJS?
- Controller-Model-View
- Model-Controller-View
- Model-View-Controller
- View-Model-Controller
In AngularJS, 'MVC' stands for Model-View-Controller. This architectural pattern separates an application into three interconnected components: Model (data), View (UI), and Controller (logic).
Expressions in AngularJS automatically update when the related ___________ changes.
- Controller, Model
- Controller, View
- Model, Controller
- View, Model
Expressions in AngularJS automatically update when the related View changes. AngularJS employs a two-way data binding mechanism that synchronizes the Model and View. When the Model changes, the corresponding expressions in the View are automatically updated, ensuring real-time updates and a seamless user experience. Understanding this automatic data binding is fundamental for building dynamic and responsive AngularJS applications.
In complex applications, __________ is a critical consideration for optimizing data binding in AngularJS controllers.
- Dependency Injection
- Performance
- Scope Hierarchy
- Watcher Count
In complex applications, Watcher Count is a critical consideration for optimizing data binding in AngularJS controllers. Watchers are responsible for tracking changes in the model, and an excessive number of watchers can impact performance. Developers need to be mindful of the number of watchers and implement strategies to minimize them for improved AngularJS application performance.
In AngularJS, _________ is crucial for decoupling components in the MVC architecture.
- Dependency Injection
- Encapsulation
- Observer Pattern
- Two-Way Data Binding
In AngularJS, Dependency Injection is crucial for decoupling components in the MVC architecture. Dependency Injection allows components to be independent of each other by providing them with their dependencies externally. This promotes reusability, maintainability, and testability by reducing the tight coupling between different parts of the application. Understanding Dependency Injection is fundamental for designing scalable and modular AngularJS applications.
To avoid flickering, AngularJS expressions within HTML are initially displayed as __________ until compilation.
- Curly Braces
- Double Curly Braces
- Parentheses
- Square Brackets
To avoid flickering in AngularJS, expressions within HTML are initially displayed as double curly braces ({{ }}) until compilation. These double curly braces are placeholders for AngularJS expressions, and once the compilation is complete, they are replaced with the actual values. This technique helps improve the user experience by preventing users from seeing the raw expressions before AngularJS processes them.
In a complex AngularJS application, how does efficient scope management contribute to performance optimization?
- Careful use of $digest cycle
- Employing $watchCollection for all variables
- Minimizing the use of $scope.$apply()
- Utilizing one-way data binding
Efficient scope management in a complex AngularJS application contributes to performance optimization by careful use of the $digest cycle. The $digest cycle is responsible for detecting changes in the application's data and updating the corresponding views. By minimizing unnecessary calls to $digest and optimizing the update process, developers can enhance the overall performance of the application. Understanding scope and its impact on the $digest cycle is crucial for AngularJS performance tuning.
What role does scope play in AngularJS's two-way data binding mechanism?
- Scope acts as a mediator
- Scope synchronizes data
- Scope triggers events
- Scope updates the DOM
In AngularJS's two-way data binding mechanism, the Scope plays the role of synchronizing data between the model and the view. Any changes made in the model or the view are automatically reflected in the other, ensuring real-time updates. This bidirectional data flow simplifies development and enhances the responsiveness of AngularJS applications.
How do you define a new module in AngularJS?
- angular.module() method
- defineModule() statement
- module.create() function
- ng-create-module directive
In AngularJS, you define a new module using the angular.module() method. This method allows you to create a module or retrieve an existing one. Modules play a crucial role in structuring AngularJS applications, and knowing how to define them is essential for organizing and managing the components of your application effectively.
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.
$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.
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.
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.