Your team is building a custom slider component, and you want to make sure it can be used inside Angular forms, both reactive and template-driven. What steps are necessary to achieve this?
- Add the slider component to the Angular template and use two-way data binding.
- Create a custom Angular form control and integrate it with the slider component.
- Use JavaScript event listeners to capture slider changes and update form values.
- Wrap the slider component in a separate Angular module.
To make a custom slider component compatible with Angular forms (both reactive and template-driven), you should create a custom Angular form control and integrate it with the slider component. This involves creating a control that manages the slider's value and state, allowing you to use it within Angular forms. Simply adding the component to the template and using two-way data binding may not provide the necessary form control features. Using event listeners directly is not the recommended approach in Angular. Wrapping the component in a module alone won't make it work with forms.
Dependency injection in Angular is primarily driven by the ________ mechanism.
- 'decorator'
- 'dependency'
- 'injection'
- 'singleton'
Dependency injection in Angular is primarily driven by the 'dependency' mechanism. Angular's dependency injection system is responsible for providing instances of services or other dependencies to components and services that request them. The 'dependency' mechanism ensures that components receive the correct instances of their dependencies, making it a core concept in Angular's architecture.
For optimal performance and faster initial page loads, Angular recommends using ______ compilation.
- Ahead-of-Time (AOT)
- Dynamic
- Just-in-Time (JIT)
- On-Demand
Angular recommends using Ahead-of-Time (AOT) compilation for optimal performance. AOT compiles Angular templates at build time, resulting in smaller bundle sizes and faster initial page loads because there's no need to compile templates in the browser.
In Ngxs, the @______ decorator is used to define state.
- Action
- Selector
- State
- Store
In Ngxs, the @State decorator is used to define state. It's used to decorate a class that represents a piece of state in the application. This decorator provides metadata about the state class, allowing Ngxs to manage and use this state within the application.
What is the significance of the RouterLinkActive directive?
- It provides a way to check if a route is currently active, allowing for dynamic styling of navigation links.
- It controls the navigation flow between different routes in an Angular application.
- It determines the order in which route guards are executed.
- It automatically adds query parameters to route links.
The RouterLinkActive directive is significant in Angular as it allows you to check if a route is currently active, enabling dynamic styling of navigation links. This is particularly useful for highlighting the active link in navigation menus. The other options do not accurately describe the purpose or significance of the RouterLinkActive directive.
Where in an Angular application would you typically define child routes?
- In a separate routing module
- In the app.component.ts file
- In the app.module.ts file
- In the parent component's template
Child routes in an Angular application are typically defined in a separate routing module dedicated to the feature module or component that contains those child routes. This helps organize the routing configuration and keep it modular.
For creating a custom structural directive in Angular, the directive class should implement the _____ method.
- ngOnChanges
- ngOnInit
- ngRender
- ngStructural
In Angular, when creating a custom structural directive, the directive class should implement the ngStructural method. This method is used to define how the directive should behave when applied to elements in the DOM. It allows developers to control the rendering and behavior of elements based on certain conditions, making it a crucial part of creating custom structural directives.
The HttpClient method used to send data to the server as a POST request is ________.
- delete
- get
- post
- put
The post method in the HttpClient module is used to send data to the server as a POST request. This is commonly used when you need to create or update resources on the server.
In order to group multiple controls and validate them together, you would use the ______ directive.
- ngControlGroup
- ngFormGroup
- ngGroup
- ngValidationGroup
To group multiple form controls and validate them together, you would use the "ngFormGroup" directive in template-driven forms. The "ngFormGroup" directive allows you to create a group of form controls that can be treated as a single unit for validation purposes. This is especially useful when you need to apply validation rules to a set of related form fields.
To reset the state and value of a form, you would call the ______ method on a FormGroup or FormControl instance.
- clear()
- erase()
- reset()
- restart()
To reset the state and value of a form, you would call the reset() method on a FormGroup or FormControl instance in Angular's Reactive Forms. This method clears any user-entered data and sets the form control or group back to its initial state. It's a useful function for implementing features like form reset buttons in web applications.