ValueLabs UI Developer Interview Questions and Answers

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.

Dependency injection is a design pattern that allows objects to receive dependencies rather than creating them internally.

• It helps to decouple the code and makes it more testable.

• It allows for easier maintenance and scalability.

• It can be implemented using constructor injection, setter injection, or interface injection.

• Example: Instead of creating a database connection object within a class, it can be passed as a depend

NgModule is a decorator that defines a module in Angular.

• NgModule is used to group related components, directives, and services.

• It helps to organize the application into smaller, manageable pieces.

• It can import other modules and export its own components, directives, and services.

• It can also provide configuration for dependency injection.

• Example: @NgModule({ imports: [CommonModule], declarations: [AppComponent], export

Closure is a function that has access to variables in its outer scope, even after the outer function has returned.

• A closure is created when a function is defined inside another function.

• The inner function can access variables in the outer function, even after the outer function has returned.

• Closures are commonly used to create private variables and functions in JavaScript.

• Example: function outer() { var x = 10; functio...read more