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)

Validating if a DOM element is visible on the view

In the previous recipe, we learned how to install and configure Cypress in an Angular app. There might be different cases in your application where you'd want to see if an element is visible on the DOM or not. In this recipe, we'll write some tests to identify if any elements are visible on the DOM.

Getting ready

The project for this recipe resides in chapter11/start_here/cypress-dom-element-visibility:

  1. Open the project in VS Code.
  2. Open the terminal and run npm install to install the dependencies of the project.
  3. Once done, run npm run cypress:test.

This should run the app at https://localhost:4200 and should open the Cypress window, as follows:

Figure 11.4 – Cypress tests running for the cypress-dom-element-visibility app

Now that we have the app and the Cypress tests running locally, let's see the steps of the recipe in the next section.

How to do...