Book Image

Angular Cookbook

By : Muhammad Ahsan Ayaz
Book Image

Angular Cookbook

By: Muhammad Ahsan Ayaz

Overview of this book

The Angular framework, powered by Google, is the framework of choice for many web development projects built across varying scales. It’s known to provide much-needed stability and a rich tooling ecosystem for building production-ready web and mobile apps. This recipe-based guide enables you to learn Angular concepts in depth using a step-by-step approach. You’ll explore a wide range of recipes across key tasks in web development that will help you build high-performance apps. The book starts by taking you through core Angular concepts such as Angular components, directives, and services to get you ready for building frontend web apps. You’ll develop web components with Angular and go on to cover advanced concepts such as dynamic components loading and state management with NgRx for achieving real-time performance. Later chapters will focus on recipes for effectively testing your Angular apps to make them fail-safe, before progressing to techniques for optimizing your app’s performance. Finally, you’ll create Progressive Web Apps (PWA) with Angular to provide an intuitive experience for users. By the end of this Angular book, you’ll be able to create full-fledged, professional-looking Angular apps and have the skills you need for frontend development, which are crucial for an enterprise Angular developer.
Table of Contents (15 chapters)

Using Virtual Scroll for huge lists

There might be certain scenarios in your application where you might have to show a huge set of items. This could be from either your backend API or the browser's local storage. In either case, rendering a lot of items at once causes performance issues because the Document Object Model (DOM) struggles, and also because of the fact that the JS thread gets blocked and the page becomes unresponsive. In this recipe, we'll render a list of 10,000 users and will use the Virtual Scroll functionality from the Angular CDK to improve the rendering performance.

Getting ready

The project that we are going to work with resides in chapter09/start_here/using-cdk-virtual-scroll, inside the cloned repository. Proceed as follows:

  1. Open the project in Visual Studio Code (VS Code).
  2. Open the terminal and run npm install to install the dependencies of the project.
  3. Once done, run ng serve -o.

    This should open the app in a new browser tab...