You have a multi-step registration process where each step is its own route. A user should not proceed to the next step without completing the previous one. How would you enforce this in Angular?
- Implementing route guards to prevent navigation to the next step until the current step is completed.
- Using conditional statements to hide the next step until the current step is completed.
- Storing step completion status in a browser cookie and checking it during navigation.
- Reloading the page after each step to ensure step completion.
In Angular, you can enforce the requirement that a user should not proceed to the next step without completing the previous one by implementing route guards. Route guards are Angular's way of protecting routes and can be used to prevent navigation until certain conditions, such as step completion, are met. The other options are not recommended practices for enforcing this requirement in an Angular application.
How does Akita differ in its approach to state management compared to NgRx?
- Employs Redux-style pattern with actions and reducers
- Favors a component-based state management approach
- Uses a simpler, more declarative approach
- Utilizes MobX for reactive state management
Akita differs from NgRx by using a simpler and more declarative approach to state management. It provides a straightforward way to manage state in Angular applications without the boilerplate associated with Redux-style patterns.
You have a shared service that maintains user settings. You notice that different parts of the application have different instances of this service. What could be a possible reason?
- Different parts of the application are using different configurations, which require separate instances of the service.
- The application is not using a proper dependency injection framework.
- The shared service is being loaded with lazy loading modules, leading to multiple instances.
- There is a bug in the shared service causing it to create multiple instances.
Different parts of the application may require different configurations or data, which necessitates separate instances of the shared service. This allows each part of the application to have its own instance with specific settings or configurations. It's not a bug or dependency injection issue but rather a design choice to accommodate varying requirements.
You're creating a feedback form where users can rate a product. You want to ensure users provide a rating between 1 to 5. How would you validate the input to ensure values are within this range?
- Use client-side JavaScript to restrict input to values between 1 and 5.
- Implement server-side validation to check the rating before storing it.
- Utilize Angular's Validators to create a custom validation rule for the rating field.
- Allow users to enter any value and provide an error message if it's not within the range after submission.
To validate user input for a rating between 1 to 5 in an Angular form, you would use Angular's Validators to create a custom validation rule (Option 3). This ensures the validation occurs on the client side. Server-side validation (Option 2) is important but doesn't prevent invalid values from being submitted. Option 1 restricts input but doesn't provide feedback, and Option 4 is less user-friendly.
Your application has a dynamic form where fields can be added or removed based on user input. Which feature of Angular's Reactive Forms would you leverage to accomplish this?
- Create a separate component for each dynamic form field.
- Implement dynamic forms using Angular's template-driven approach.
- Use the ngIf directive to conditionally render form fields.
- Utilize form arrays to dynamically add or remove form controls.
In Angular's Reactive Forms, you would leverage form arrays to dynamically add or remove form controls based on user input in a dynamic form. The ngIf directive is more suitable for conditionally rendering existing elements in the DOM, not for dynamically managing form controls. Creating a separate component for each dynamic form field is not the recommended approach for dynamic forms, and Angular's template-driven approach is less flexible in handling dynamic forms than Reactive Forms with form arrays.
What is the primary use of in Angular?
- To define a new component in Angular.
- To display data from an API.
- To project content from a parent component into a child component.
- To style Angular components using CSS.
The primary use of in Angular is to project content from a parent component into a child component. This allows you to pass content or HTML elements from a parent component to a designated location in a child component, facilitating component reusability and flexibility. It's a fundamental concept in Angular for creating dynamic and customizable components.
To project specific content into a designated slot, you would use the select attribute of with a ________ selector.
- Class
- Slot
- Name
- Tag
When using content projection in Angular with , you typically use the select attribute with a CSS class selector to specify where the content should be projected. This allows you to target specific slots in the child component's template. Options 1, 3, and 4 are not commonly used in this context.
Which module should you import to use the HttpClient in an Angular application?
- @angular/common/http
- @angular/core
- @angular/forms
- @angular/router
To use the HttpClient in an Angular application, you should import the @angular/common/http module. This module provides the HttpClient service for making HTTP requests.
A client asks for a feature where a child component should be able to inform its parent component when a button inside the child component is clicked. How would you implement this interaction?
- Use the @Output decorator to emit an event from the child component and bind to it in the parent component.
- Use the @ViewChild decorator to access the child component's method directly from the parent component.
- Use the @Input decorator to pass a callback function from the parent to the child component.
- Use the @HostListener decorator to listen for events in the child component and trigger a method in the parent component.
To implement communication from child to parent in Angular, you can use the @Output decorator to emit an event from the child component, and the parent component can bind to this event to listen for changes. This allows the child to inform the parent when the button is clicked. The other options are not the typical approach for this scenario.
In Angular's reactive forms, the method used to mark a control as touched is called ______.
- markAsDirty()
- markAsTouched()
- setDirty()
- setTouched()
In Angular's reactive forms, the method used to mark a control as touched is called markAsTouched(). This method is used to indicate that a form control has been interacted with by the user. It's commonly used for validation and to show error messages for untouched controls.