Q: How do you debug LWC components?
A: You debug LWC components using browser developer tools, console.log statements, and the Salesforce Lightning Inspector Chrome extension.
Q: How do you handle pagination in LWC?
A: Pagination can be handled by dividing data into chunks and providing navigation controls to switch between pages, often implemented with lightning-button components and JavaScript logic.
Q: How do you manage component visibility based on user permissions in LWC?
A: You manage component visibility by querying user permissions in Apex and conditionally rendering parts of the component based on the result.
Q: How do you use the lightning-tabset component?
A: The lightning-tabset component is used to create tabbed interfaces, where each tab is defined using lightning-tab components.
Q: What is the @lwc/synthetic-shadow module used for?
A: The @lwc/synthetic-shadow module is used to enable the synthetic shadow DOM in Salesforce, providing better compatibility with legacy code and third-party libraries.
Q: How do you use lightning-record-view-form?
A: The lightning-record-view-form component is used to display a record in read-only mode, using lightning-output-field to display individual fields.
Q: How do you manage long-running operations in LWC?
A: Long-running operations can be managed using asynchronous JavaScript functions and displaying loading indicators to provide feedback to users.
Q: How do you use lightning-formatted-number?
A: The lightning-formatted-number component is used to display formatted numbers, with support for locale-specific formatting and options like currency and percentage.
Q: How do you bind events in LWC?
A: Events are bound in LWC using standard HTML event attributes (e.g., onclick, onchange) and defining corresponding handler methods in the JavaScript class.
Q: How do you use the lightning-record-edit-form component?
A: The lightning-record-edit-form component is used to create a form for editing a record, with lightning-input-field components for individual fields and lightning-button for actions.
Q: How do you handle context in LWC?
A: Context is handled by passing data through properties, using slots, and leveraging Lightning Message Service (LMS) for cross-component communication.
Q: How do you handle custom fonts in LWC?
A: Custom fonts are handled by uploading them as static resources and including them in your component’s CSS using @font-face rules.
Q: How do you use lightning-checkbox-group?
A: The lightning-checkbox-group component is used to create a group of checkboxes, with options provided as an array and selected values handled via a JavaScript property.
Q: How do you access the current user’s information in LWC?
A: The current user’s information can be accessed using the User standard object in Apex, and exposing the data to LWC via wire services or Apex methods.
Q: How do you implement custom labels in LWC?
A: Custom labels are implemented by defining them in Salesforce Setup, importing them into the component’s JavaScript file using @salesforce/label/LabelName, and referencing them in the HTML template.
Q: How do you create a custom toast notification in LWC?
A: Custom toast notifications can be created using the ShowToastEvent from the lightning/platformShowToastEvent module and dispatching it with the desired properties (title, message, variant).
Q: How do you handle API callouts in LWC?
A: API callouts are handled in Apex, with the Apex methods exposed to LWC via @AuraEnabled annotations, and called from LWC using @wire or imperative Apex calls.
Q: How do you use the lightning-breadcrumb component?
A: The lightning-breadcrumb component is used to display a breadcrumb trail, with each breadcrumb represented by a lightning-breadcrumb-item.
Q: How do you dynamically add styles in LWC?
A: Dynamic styles can be added by manipulating the class attribute or style attribute of HTML elements in JavaScript.
Q: How do you handle data filtering in LWC?
A: Data filtering can be handled by applying JavaScript filter functions to the data array based on user input or predefined criteria.
Q: How do you integrate third-party JavaScript libraries in LWC?
A: Third-party JavaScript libraries can be integrated by uploading them as static resources and loading them in your LWC component using loadScript.
Q: How do you use lightning-dual-listbox?
A: The lightning-dual-listbox component is used to create a dual listbox interface, where users can move options between two lists.
Q: How do you handle file uploads in LWC?
A: File uploads are handled using the lightning-file-upload component, which allows users to upload files to Salesforce records.
Q: How do you manage event bubbling in LWC?
A: Event bubbling is managed by stopping propagation in the event handler using event.stopPropagation() or by setting bubbles: false when dispatching custom events.
Q: How do you use lightning-datatable for editable data grids?
A: The lightning-datatable component can be made editable by setting the editable attribute to true and defining columns with editable cells.
Q: How do you create a reusable LWC component?
A: A reusable LWC component is created by designing it to be configurable through properties, events, and slots, ensuring it can be used in different contexts.
Q: How do you handle session timeouts in LWC?
A: Session timeouts are handled by detecting user inactivity and using JavaScript timers to trigger warnings or automatic logouts.
Q: How do you manage large datasets in LWC?
A: Large datasets are managed by implementing pagination, lazy loading, or infinite scrolling to load data incrementally.
Q: How do you use the lightning-input-rich-text component?
A: The lightning-input-rich-text component is used to create a rich text editor, allowing users to format text with various styles and options.
Q: How do you handle state synchronization between components in LWC?
A: State synchronization between components can be handled using shared state management techniques like Lightning Message Service (LMS), custom events, or a shared JavaScript service module.
LWC Interview Questions and Answers
LWC Interview Questions and Answers – Part 1
LWC Interview Questions and Answers – Part 2
LWC Interview Questions and Answers – Part 3