To avoid polluting the global scope, controllers should be encapsulated within a _________.
- closure
- controller
- directive
- module
To avoid polluting the global scope, controllers should be encapsulated within a module. Modules in AngularJS act as containers for different components of an application, providing a way to organize and structure the code. Encapsulating controllers within modules helps in managing dependencies, improving code maintainability, and preventing naming conflicts in large applications.
What are the implications of deep watching an object in AngularJS for data binding in a controller?
- It can lead to performance issues
- It has no impact on data binding
- It increases data binding performance
- It simplifies the data binding process
Deep watching an object in AngularJS for data binding in a controller can have implications on performance. Deep watching involves monitoring changes at nested levels within an object, and if not used judiciously, it can lead to performance issues by triggering frequent digest cycles. Developers need to be cautious when employing deep watches to avoid unnecessary overhead in complex applications.
Describe the role of $injector in AngularJS's dependency injection mechanism.
- $injector defines new dependencies
- $injector handles HTTP requests
- $injector manages DOM manipulation
- $injector resolves and injects dependencies
The role of $injector in AngularJS's dependency injection mechanism is to resolve and inject dependencies into AngularJS components. It is responsible for managing the dependency injection process, ensuring that the required services or objects are available when needed. Understanding the $injector is essential for implementing and customizing dependency injection in AngularJS applications.
In AngularJS, __________ is used for creating reusable components that manage their own view.
- ng-component
- ng-controller
- ng-model
- ng-view
In AngularJS, the ng-component directive is used for creating reusable components that manage their own view. Components encapsulate both the template (view) and the logic (controller) associated with a specific part of the user interface. Using components enhances code organization, reusability, and maintainability in AngularJS applications.
To effectively isolate a directive's $scope, the __________ property is used in the directive's definition.
- isolate
- isolateScope
- scope
- scopeIsolation
To effectively isolate a directive's $scope, the scope property is used in the directive's definition. By setting the scope property to true or an object, you can create an isolated scope for the directive. This helps in encapsulating the directive's behavior and preventing unintended interactions with parent scopes. Understanding scope isolation is essential for building modular and reusable directives in AngularJS applications.
In AngularJS, ________ are used to deal with multiple HTTP requests to an external API asynchronously.
- AsyncTasks
- Callbacks
- Observables
- Promises
In AngularJS, Observables are used to deal with multiple HTTP requests to an external API asynchronously. Observables represent a sequence of values over time and provide powerful features for handling asynchronous operations, such as HTTP requests. Observables support operators that enable developers to transform, filter, and combine data streams, making them a flexible and efficient choice for managing asynchronous tasks in AngularJS applications.
In AngularJS, __________ is used in controllers to create a two-way data binding.
- ng-bind
- ng-bind-model
- ng-data
- ng-model
In AngularJS, ng-model is used in controllers to create a two-way data binding. Two-way data binding allows changes in the model to automatically update the view and vice versa. By using ng-model, developers can easily synchronize the data between the controller and the view, enhancing the responsiveness of the application.
The __________ is a core feature of AngularJS that underpins its two-way data binding mechanism.
- Compiler Module
- Data Binding Engine
- Dependency Injection
- Digest Cycle
The Digest Cycle is a core feature of AngularJS that underpins its two-way data binding mechanism. The Digest Cycle is responsible for detecting changes in the application's data model and updating the corresponding views. Understanding the Digest Cycle is essential for grasping how AngularJS efficiently manages data binding and ensures real-time synchronization between the Model and the View.
In a scenario involving frequent view transitions, what AngularJS features ensure smooth and efficient view updates?
- Transition Controllers
- View Caching
- View Preloading
- ngAnimate Module
In scenarios with frequent view transitions, AngularJS ensures smooth and efficient updates through the ngAnimate module. ngAnimate provides a set of predefined CSS classes and JavaScript hooks that can be utilized to create animations during view transitions. This feature enhances the user experience by adding subtle animations, making the transitions visually appealing and seamless. Understanding ngAnimate is essential for developers working on applications with dynamic and frequent view changes.
How does $scope isolation in directives affect component reusability?
- It enhances component reusability by preventing unintended data modifications
- It has no impact on component reusability
- It hinders component reusability by limiting access to data
- It only affects styling, not data
$scope isolation in directives enhances component reusability by preventing unintended data modifications. It encapsulates the scope within the directive, minimizing the risk of external interference. This isolation promotes modularity and allows directives to be reused across different parts of an application without unintended side effects. Understanding $scope isolation is crucial for building maintainable and reusable components in AngularJS.