Q: How do you handle lifecycle hooks in LWC?
A: You handle lifecycle hooks by defining methods like connectedCallback(), disconnectedCallback(), renderedCallback(), etc., in your LWC JavaScript class.
Q: What is the @wire decorator in LWC?
A: The @wire decorator is used to connect a property or method to Salesforce data using wire adapters and functions.
Q: How do you include images in an LWC component?
A: You include images by uploading them as static resources and referencing them using @salesforce/resourceUrl in your JavaScript file.
Q: What is the lightning-layout component used for?
A: The lightning-layout component is used for creating flexible grid layouts using SLDS grid system.
Q: How do you format dates in LWC?
A: You format dates using JavaScript’s Intl.DateTimeFormat object or custom formatting functions.
Q: How do you use the lightning-slider component?
A: You use the lightning-slider component to create a slider control by specifying the min, max, and value attributes.
Q: How do you trigger re-rendering in LWC?
A: Re-rendering is automatically triggered by changes to reactive properties or tracked fields.
Q: What is the purpose of the static resource in LWC?
A: Static resources are used to upload and include external files like JavaScript libraries, CSS, images, and other assets in your LWC.
Q: How do you create a popover in LWC?
A: You create a popover by using the lightning-button-menu and lightning-menu-item components or custom HTML/CSS for advanced designs.
Q: How do you handle component state initialization in LWC?
A: Component state is initialized in the JavaScript class constructor or as field declarations.
Q: How do you access URL parameters in LWC?
A: You access URL parameters using the CurrentPageReference in a wire adapter.
Q: How do you implement a confirmation dialog in LWC?
A: You implement a confirmation dialog using standard HTML dialogs or the lightning-button component combined with JavaScript for handling user confirmation.
Q: How do you handle errors in wire adapters?
A: You handle errors in wire adapters by using the error property or callback function to handle error states.
Q: What is the lightning-radio-group component?
A: The lightning-radio-group component is used to create a set of radio buttons for selecting a single option from multiple choices.
Q: How do you manage session storage in LWC?
A: You manage session storage using JavaScript’s sessionStorage object to store and retrieve data.
Q: How do you create a read-only form in LWC?
A: You create a read-only form using the lightning-record-view-form component and lightning-output-field for displaying field values.
Q: How do you deploy an LWC component to a Salesforce org?
A: You deploy an LWC component using tools like Salesforce CLI, Change Sets, or Metadata API.
Q: How do you handle CSS isolation in LWC?
A: CSS isolation is handled automatically by the LWC framework, ensuring styles are scoped to the component.
Q: What is the lightning-pill component?
A: The lightning-pill component is used to display items in a pill format, which can include a label and a remove button.
Q: How do you manage global state in LWC?
A: You manage global state using custom events, Lightning Message Service (LMS), or a shared service module.
Q: How do you handle accessibility in LWC?
A: Accessibility is handled by following ARIA guidelines, using SLDS, and ensuring semantic HTML elements.
Q: How do you handle file downloads in LWC?
A: You handle file downloads by creating a link element with a href attribute set to the file URL and triggering a click event.
Q: How do you create a carousel in LWC?
A: You create a carousel using the lightning-carousel and lightning-carousel-image components.
Q: How do you handle JSON data in LWC?
A: You handle JSON data using JavaScript methods like JSON.parse() and JSON.stringify().
Q: How do you manage nested components in LWC?
A: You manage nested components by including child components in the parent’s HTML template and passing data via properties.
Q: What is the lightning-tree component?
A: The lightning-tree component is used to display hierarchical data in a tree structure.
Q: How do you work with maps in LWC?
A: You work with maps using the lightning-map component, providing location data and map settings.
Q: How do you use the lightning-formatted-date-time component?
A: You use the lightning-formatted-date-time component to display formatted date and time values based on locale settings.
Q: How do you implement dynamic styles in LWC?
A: You implement dynamic styles using JavaScript to update class lists or style attributes based on component state.
Q: How do you handle custom metadata in LWC?
A: You handle custom metadata by querying it in Apex and exposing it to the LWC component via wire services or Apex calls.
LWC Interview Questions and Answers
LWC Interview Questions and Answers – Part 1
LWC Interview Questions and Answers – Part 2