To continue processing in an Observable sequence after an error occurs, you can use the _____ operator to replace the error with a new source.
- catchError
- combineLatest
- map
- retry
To continue processing after an error in an Observable, you can use the catchError operator to replace the error with a new source.
When a navigation fails due to an unexpected error, Angular fires the _____ event.
- NavigationCancel
- NavigationEnd
- NavigationError
- NavigationStart
When a navigation fails due to an unexpected error, Angular fires the NavigationError event. This event is triggered when there is an error during navigation.
To set up the testing environment before running any test suite in Protractor, you can utilize the _____ function in the configuration file.
- beforeAll
- browser.driver
- onCleanup
- onPrepare
To set up the testing environment before running any test suite in Protractor, you can use the onPrepare function in the configuration file.
How do you track the validity and state of a form control in a template-driven form?
- Using *ngIf directive
- Using [(ngModel)] directive
- Using [formControl] directive
- Using [formState] directive
To track the validity and state of a form control in a template-driven form, you can use the [formControl] directive, which binds the control's state and validity to the template.
You're working on an application that has several feature modules. To improve the user experience, you decide to preload some modules in the background while the user is interacting with the app. How can you implement this behavior?
- Manually load modules using import() as the user interacts with different parts of the app
- Use localStorage to cache module data and preload them when the app loads
- Use the Angular Router Preloading Strategy to preload specific modules
- Utilize a service worker to cache and preload modules as a background process
To improve the user experience by preloading specific modules in the background as the user interacts with the app, you can use the Angular Router Preloading Strategy. It allows you to preload modules when needed, optimizing the app's performance.
Which RxJS operator would you use to combine multiple Observables into a single Observable?
- combineLatest()
- concatMap()
- reduce()
- switchMap()
To combine multiple Observables into a single Observable, you can use the combineLatest() operator, which emits a new value when any of the source Observables emits a new value.
To validate that at least one control within a Form Array has a specific value, you would use a _______ validator.
- Array
- Custom
- MinLength
- Required
To validate that at least one control within a Form Array has a specific value, you would use a Custom validator. A custom validator allows you to define your own validation logic.
How can you display validation error messages for a custom validator in Angular?
- Use Reactive Forms
- Use a FormBuilder
- Use a FormGroup
- Use a Validation Message
To display validation error messages for a custom validator in Angular, you can use a Validation Message. This involves creating custom error messages and binding them to the form control to inform users of validation issues.
When using Angular Elements, what considerations must be taken into account for handling data and events in the custom element?
- Avoiding data sharing between components
- Direct DOM manipulation
- Ensuring data encapsulation and event emitters
- Use Angular services for data communication
When working with Angular Elements, it's important to use Angular services for data communication to ensure proper encapsulation and handling of data and events.
How can you apply a custom validator to a form control in Angular?
- Applying ngFor directive
- By extending the FormControl class
- Using the async pipe
- Using the ngIf directive
You can apply a custom validator to a form control in Angular by extending the FormControl class and implementing your validation logic within it.