You need to create a custom directive that changes the background color of an element when the user hovers over it. What Angular concepts and decorators would you use to achieve this?
- Apply styles directly in the component's HTML template
- Implement ngOnChanges to track changes in the element's state
- Use @HostListener to handle hover events
- Utilize @ViewChild to access the element and manipulate its styles
To create a custom directive that changes the background color on hover, you would use the @HostListener decorator to handle hover events and apply the desired behavior.
To reactively listen to changes to route parameters in Angular, you should use the _____ property of the ActivatedRoute service.
- paramMap
- paramsChanged
- routeChange
- routeParams
To reactively listen to changes to route parameters in Angular, you should use the paramMap property of the ActivatedRoute service.
In Angular, the method used to add a new form control to a FormArray dynamically is ____.
- addFormControl
- appendControl
- createControl
- pushControl
In Angular, the method used to add a new form control to a FormArray dynamically is appendControl. This method allows you to dynamically add a new form control to an existing FormArray.
Components that are designed to be reusable across multiple parts of an application often implement the _____ lifecycle hook to do cleanup work.
- ngDoCheck
- ngOnChanges
- ngOnDestroy
- ngOnInit
Components that are designed to be reusable across multiple parts of an application often implement the ngOnDestroy lifecycle hook to do cleanup work, like unsubscribing from observables.
How does the @HostListener decorator enhance the functionality of a directive?
- Allows the directive to listen to events on the host element
- Binds data to HTML elements
- Defines component lifecycle hooks
- Enables routing in directives
The @HostListener decorator in Angular allows the directive to listen to events on the host element, enhancing its interactivity and behavior.
What is the purpose of the updateOn property when creating a new FormControl instance?
- It defines the initial control value
- It determines when the control is updated
- It sets the control's required state
- It specifies when to submit the form data
The updateOn property when creating a new FormControl instance in Angular specifies when the control is updated, which affects how and when the form data is updated and submitted.
The Route Resolver uses the _____ method to load the data necessary for the route.
- fetch
- load
- resolve
- retrieve
The blank should be filled with resolve. The Route Resolver uses the resolve method to load the data necessary for the route.
To ensure that an Angular animation has completed before starting another one, you can use _______.
- Animation order
- Animation preconditions
- Animation sequencing
- Animation triggers
In Angular, to ensure that an animation has completed before starting another one, you can use Animation sequencing. This allows you to control the order of animations and ensure they run in sequence.
What is the advantage of using custom async validators in Angular forms?
- They enhance user experience
- They improve code maintainability
- They optimize server-side performance
- They simplify form creation and validation
The advantage of using custom async validators in Angular forms is that they enhance user experience by allowing you to perform asynchronous validation tasks, such as checking data with a server, without blocking the UI.
To control how Angular should handle navigation extras when reusing a route, you can configure the _____ option.
- RouteReuseStrategy
- LazyLoadingStrategy
- NavigationStrategy
- RoutingStrategy
To control how Angular should handle navigation extras when reusing a route, you can configure the RouteReuseStrategy option. This allows you to define the behavior of route reusability.