NextEdge Labs Lead Designer Interview Questions and Answers

Event loop is a mechanism in NodeJS that allows non-blocking I/O operations to be performed asynchronously.

• Event loop is responsible for handling all I/O operations in NodeJS

• It allows NodeJS to perform non-blocking I/O operations asynchronously

• Event loop continuously checks the event queue for new events to process

• Callbacks are used to handle events in NodeJS

ExtJS is a JavaScript framework for building web applications with rich user interfaces.

• ExtJS has a wide range of components including grids, forms, trees, charts, and more.

• Components can be customized with themes and plugins.

• Some popular ExtJS components include GridPanel, FormPanel, and TreePanel.

• ExtJS also includes a powerful data package for managing data in components.

• Components can be easily integrated with other

Different methods to fetch values in UI development

• Using document.getElementById() to fetch value by element ID

• Using document.querySelector() to fetch value by CSS selector

• Using event.target.value to fetch value from input fields

• Using AJAX to fetch data from server

• Using local storage to fetch stored values

Grid events and structures are essential for UI development.

• Grid events are actions that occur when a user interacts with a grid, such as clicking a cell or scrolling.

• Grid structures refer to the layout and organization of the grid, including columns, rows, and headers.

• Examples of grid events include onCellClick, onRowSelect, and onScroll.

• Examples of grid structures include columnDefs, rowData, and headerHeight.