In what scenario would you create a custom directive instead of using a component in Angular?
- Handling user input
- Implementing complex logic
- Managing application state
- Reusing UI behavior
You would create a custom directive in Angular when you want to reuse UI behavior across different parts of your application.
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.
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.
Your Angular application includes a form that users utilize to submit sensitive data. How can you ensure that the form data is only submitted once, even if the user accidentally clicks the submit button multiple times?
- Implement a server-side mechanism that tracks and validates submitted data
- Use a client-side timer to disable the submit button for a fixed duration
- Use client-side JavaScript to check for duplicate submissions
- Utilize Angular guards to prevent multiple form submissions
To ensure that sensitive form data is submitted only once, you should utilize Angular guards to prevent multiple submissions. Angular guards allow you to control navigation and actions within your application.