Salesforce Lightning Interview Questions and Answers

Ques 1. Explain the concept of Lightning App Builder.

Lightning App Builder is a visual tool that allows users to create custom pages for the Salesforce mobile app or Lightning Experience without code.

Example:

Using Lightning App Builder, administrators can drag and drop components to design custom pages.

Ques 2. What is the purpose of Lightning Record Page?

Lightning Record Pages are used to customize the layout and organization of information for a specific object's record in Lightning Experience.

Example:

You can use Lightning Record Pages to create a tailored user experience for different record types.

Ques 3. How does event-driven programming work in Salesforce Lightning?

Events in Salesforce Lightning are used to communicate between components and enable a loosely coupled architecture.

Example:

A Lightning Component can fire an event, and other components can listen and respond to that event.

Ques 4. What is a Lightning Web Component (LWC)?

A Lightning Web Component (LWC) is a lightweight, standards-based component framework for building web components on the Salesforce platform.

Example:

LWC uses modern JavaScript and HTML to build components that are interoperable with web standards.

Ques 5. Explain the role of Aura framework in Salesforce Lightning.

The Aura framework is the underlying framework for the Lightning Component framework, providing the runtime for Lightning Components.

Example:

Developers use Aura framework to build reusable components that can be used in the Lightning Experience.

Ques 6. How do you handle errors in Lightning components?

Errors in Lightning components can be handled using the try-catch block in JavaScript or by using the Lightning:notificationsLibrary component.

Example:

You can display error messages to users or log errors for debugging purposes.

Ques 7. How do you implement a Lightning Component in a Visualforce page?

You can use the tag to include a Lightning Component in a Visualforce page.

Example:

Ques 8. Explain the role of Apex in Salesforce Lightning.

Apex is used in Salesforce Lightning to implement server-side logic for Lightning components.

Example:

You can use Apex controllers to handle server-side processing and interact with the Salesforce database.

Ques 9. What is the difference between application events and component events in Lightning?

Application events are used for communication between components that are not in the same containment hierarchy, while component events are for communication between components in the same hierarchy.

Example:

Use application events when components are not directly related, and component events when they are.

Ques 10. Explain Lightning Locker Service.

Lightning Locker Service enhances security by isolating components in their own namespace, preventing access to global resources.

Example:

It helps in preventing cross-site scripting (XSS) and ensures a secure environment for Lightning components.

Ques 11. How can you use Lightning components in Salesforce1 mobile app?

You can use the Salesforce1 navigation menu to access Lightning components in the Salesforce1 mobile app.

Example:

By adding your Lightning component to a Lightning app and configuring it for the Salesforce1 navigation menu.

Ques 12. What is the purpose of the aura:iteration tag in Lightning components?

The aura:iteration tag is used to iterate over a collection of items and generate the specified HTML or components for each item.

Example:

It is useful for displaying lists or tables of data in a Lightning component.

Ques 13. Explain the use of Lightning Data Table in Lightning components.

Lightning Data Table is a component that displays a table of data with features like sorting, inline editing, and row selection.

Example:

It is often used to present data in a tabular format within Lightning components.

Ques 14. What is the purpose of the lightning:recordEditForm component?

The lightning:recordEditForm component is used to create a form for editing a record in Lightning Experience or Salesforce mobile app.

Example:

It simplifies the process of creating, updating, or deleting records in a Lightning component.

Ques 15. What is the purpose of the lightning:overlayLibrary component?

The lightning:overlayLibrary component is used to create modals, popovers, and other overlay components in Lightning Experience.

Example:

It provides a standardized way to create and manage overlay components.

Ques 16. How can you use Lightning components in Visualforce pages?

You can use the apex:includeLightning tag to include Lightning components in Visualforce pages.

Example: