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Angular for Enterprise Applications
Angular for Enterprise Applications

Angular for Enterprise Applications: Build scalable Angular apps using the minimalist Router-first architecture , Third Edition

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Angular for Enterprise Applications

Forms, Observables, Signals, and Subjects

In this chapter, we’ll work on a simple weather app, LocalCast Weather, using Angular and a third-party web API from OpenWeatherMap.org. The source code for this project is provided on GitHub at https://github.com/duluca/local-weather-app, including various stages of development in the projects folder.

If you’ve never used Angular before and need an introduction to Angular essentials, I recommend checking out What is Angular? on Angular.dev at https://angular.dev/overview and going through the Learn Angular Tutorial at https://angular.dev/tutorials/learn-angular.

Feeling brave? Just type the following into your terminal:

$ npm create @angular

LocalCast Weather is a simple app that demonstrates the essential elements that make up an Angular application, such as components, standalone components, modules, providers, pipes, services, RxJS, unit testing, e2e using Cypress, environment variables, Angular...

Technical requirements

The most up-to-date versions of the sample code for the book are on GitHub at the repository linked shortly. The repository contains the final and completed state of the code. You can verify your progress at the end of this chapter by looking for the end-of-chapter snapshot of code under the projects folder.

For Chapter 2:

  1. Clone the https://github.com/duluca/local-weather-app repo.
  2. Execute npm install on the root folder to install dependencies.
  3. The beginning state of the project is reflected at:
    projects/stage5
    
  4. The end state of the project is reflected at:
    projects/stage6
    
  5. Add the stage name to any ng command to act only on that stage:
    npx ng build stage6
    

Note that the dist/stage6 folder at the root of the repository will contain the compiled result.

Beware that the source code provided in the book and the version on GitHub are likely to be...

Great UX should drive implementation

Creating an easy-to-use and rich User Experience (UX) should be your main goal. You shouldn’t pick a design just because it’s easiest to implement. However, often, you’ll find a great UX that is simple to implement in the front end of your app but a lot more difficult on the back end. Consider google.com’s landing page:

A screenshot of a google search  Description automatically generated with medium confidence

Figure 2.2: Google’s landing page

In this context, Google Search is just a simple input field with two buttons. Easy to build, right? That simple input field unlocks some of the world’s most sophisticated and advanced software technologies backed by a global infrastructure of custom-built data centers and Artificial Intelligence (AI). It is a deceptively simple and insanely powerful way to interact with users. You can augment user input by leveraging modern web APIs like GeoLocation and add critical context to derive new meaning from user input. So, when the user types in Paris...

Reactive versus template-driven forms

Now, we’ll implement the search bar on the home screen of the application. The next user story states Display forecast information for current location, which may be taken to imply an inherent GeoLocation functionality. However, as you may note, GeoLocation is a separate task. The challenge is that with native platform features such as GeoLocation, you are never guaranteed to receive the actual location information. This may be due to signal loss issues on mobile devices, or the user may simply refuse to give permission to share their location information.

First and foremost, we must deliver a good baseline UX and implement value-added functionality such as GeoLocation only afterward. In stage5, the status of the project is represented on the Kanban board, as captured in the following snapshot:

A screenshot of a chat  Description automatically generated with medium confidence

Figure 2.3: GitHub project Kanban board

We’ll implement the Add city search capability card (which captures a user story...

Component interaction with BehaviorSubject

To update the current weather information, we need the citySearch component to interact with the currentWeather component. There are four main techniques to enable component interaction in Angular:

  • Global events
  • Parent components listening for information bubbling up from children components
  • Sibling, parent, or children components within a module that works off of similar data streams
  • Parent components passing information to children components

Let’s explore them in detail in the following sections.

Global events

This technique has been leveraged since the early days of programming in general. In JavaScript, you may have achieved this with global function delegates or jQuery’s event system. In AngularJS, you may have created a service and stored variables within it.

In Angular, you can still create a root-level service, store values in it, use Angular’s EventEmitter class...

Managing subscriptions

Subscriptions are a convenient way to read a value from a data stream for your application logic. If unmanaged, they can create memory leaks in your application. A leaky application will consume ever-increasing amounts of RAM, eventually leading the browser tab to become unresponsive, leading to a negative perception of your app and, even worse, potential data loss, which can frustrate end users.

The source of a memory leak may not be obvious. In CurrentWeatherComponent, we inject WeatherSevice to access the value of BehaviorSubject, currentWeather$. If we mismanage subscriptions,currentWeather$, we can end up with leaks in the component or the service.

Lifecycle of services

By default, Angular services are shared instance services or singletons automatically registered to a root provider. This means that, once created in memory, they’re kept alive as long as the app or feature module they’re a part of remains in memory. See the following...

Coding in the reactive paradigm

As covered in Chapter 1, Angular’s Architecture and Concepts, we should only subscribe to an observable stream to activate it. If we treat a subscribe function as an event handler, we implement our code imperatively.

Seeing anything other than an empty subscribe() call in your code base should be considered a red flag because it deviates from the reactive paradigm.

In reactive programming, when you subscribe to an event in a reactive stream, you shift your coding paradigm from reactive programming to imperative programming. There are two places in our application where we subscribe, one in CurrentWeatherComponent, and the other in CitySearchComponent.

Let’s start by fixing CurrentWeatherComponent so we don’t mix paradigms.

Binding to an observable with an async pipe

Angular has been designed to be an asynchronous framework from the ground up. You can get the most out of Angular by staying in the reactive...

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Key benefits

  • Dive straight into the most relevant topics that will help you build large, complex, and high-performance web applications
  • Find updated examples, projects, and an overview of the latest tools and updates – including Jest, Cypress, NgRx workspace, Apollo GraphQL, and Angular Dev Tools
  • Get to grips with reactive code and learn how to resolve potential issues before they crop up

Description

If you’re looking to upskill and build sophisticated, minimalist web applications suited for enterprise use, Angular for Enterprise Applications is your guide to the next level of engineering mastery. In its third edition, this Angular book distils hard-earned lessons into a lucid roadmap for success. Adopting a pragmatic approach founded on a robust technical base, you'll utilize both JavaScript and TypeScript fundamentals. You'll also embrace agile engineering coding principles and learn to architect optimally sized enterprise solutions employing the freshest concepts in Angular. You’ll gradually build upon this foundation through insightful recipes, sample apps, and crystal-clear explanations. You’ll master authentication and authorization and achieve optimal performance through reactive programming and lazy loading, build complex yet flexible UIs with Router-first principles, and then integrate with backend systems using REST and GraphQL APIs. You’ll cover modern tools like RxAngular, Qwik, and Signals. You’ll construct master/detail views using data tables and NgRx for state management. You’ll explore DevOps using Docker and build CI/CD pipelines necessary for high-performance teams. By the end of this book, you’ll be proficient in leveraging Angular in enterprise and design robust systems that scale effortlessly.

Who is this book for?

This book is for mid-to-senior developers looking to gain mastery by learning how to write, test, and deploy Angular in an enterprise environment. Working experience with JavaScript is a prerequisite, and a familiarity with TypeScript and RESTful APIs will help you understand the topics covered in this book more effectively

What you will learn

  • Best practices for architecting and leading enterprise projects
  • Minimalist, value-first approach to delivering web apps
  • How standalone components, services, providers, modules, lazy loading, and directives work in Angular
  • Manage your app's data reactivity using Signals or RxJS
  • State management for your Angular apps with NgRx
  • Angular ecosystem to build and deliver enterprise applications
  • Automated testing and CI/CD to deliver high quality apps
  • Authentication and authorization
  • Building role-based access control with REST and GraphQL
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Table of Contents

12 Chapters
Angular’s Architecture and Concepts Chevron down icon Chevron up icon
Forms, Observables, Signals, and Subjects Chevron down icon Chevron up icon
Architecting an Enterprise App Chevron down icon Chevron up icon
Creating a Router-First Line-of-Business App Chevron down icon Chevron up icon
Designing Authentication and Authorization Chevron down icon Chevron up icon
Implementing Role-Based Navigation Chevron down icon Chevron up icon
Working with REST and GraphQL APIs Chevron down icon Chevron up icon
Recipes – Reusability, Forms, and Caching Chevron down icon Chevron up icon
Recipes – Master/Detail, Data Tables, and NgRx Chevron down icon Chevron up icon
Releasing to Production with CI/CD Chevron down icon Chevron up icon
Other Books You May Enjoy Chevron down icon Chevron up icon
Index Chevron down icon Chevron up icon

Customer reviews

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Full star icon Full star icon Full star icon Full star icon Half star icon 4.9
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5 star 85.7%
4 star 14.3%
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Matheus Rian de Souza Silva Matheus Mar 06, 2024
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Feefo Verified review Feefo
Jocelynn Hartwig Feb 23, 2024
Full star icon Full star icon Full star icon Full star icon Full star icon 5
This book is perfect for any individual or team that is looking to learn how to write scalable, enterprise-grade Angular applications. Uluca provides code samples, design patterns, and and effective narratives around challenging concepts faced by any team leveraging Angular.Whether you’re just getting started with Angular, or are looking for a solid reference to back up industry experience, this book will be greatly helpful.
Amazon Verified review Amazon
Krinja M. Mar 17, 2024
Full star icon Full star icon Full star icon Full star icon Full star icon 5
"Angular for Enterprise Applications" is an incredible resource and reference for my work as a developer. The book's focus on architecture, best practices, and real-world examples has been invaluable. The content in this books has allowed me to deliver scalable and maintainable Angular applications. The detailed ”router-first" approach has changed the way I think about application structure and navigation. I appreciate the author's emphasis on clean code and minimal reliance on third-party libraries, which has helped me create more efficient and manageable codebases. The book also covers modern Angular patterns like standalone components, signals, and the control flow syntax, ensuring that I'm working smart. While the book can be dense at times and assumes prior Angular knowledge, it has allowed me to deliver more. I highly recommend this book to any Angular developer looking to take their skills to the next level.
Amazon Verified review Amazon
Stephen Ritchie Feb 16, 2024
Full star icon Full star icon Full star icon Full star icon Full star icon 5
After I read the 2nd edition, I asked everyone on my team buy a copy and use it as a reference guide. Our team had struggled with Angular, but this book brought answers and helped us move forward. The book is pragmatic and easy to understand; the writing style is clear and direct.I've started reading the 3rd edition. Here's what you should know:- It's a great way to become proficient in Angular.- It provides the know-how to design and implement enterprise systems.- It emphasizes effective coding principles and good architectural strategies.- It's going to help you develop scalable and maintainable applications.- It provides practical examples, recipes, applications, and clear explanations.- It's takes a step-by-step approach to learning.- It teaches a lot about authentication, authorization, and reactive programming.- It covers router-first principles, connecting with backend systems using GraphQL APIs, and utilizing modern tools.- It delves into state management and complex user interfaces.- It covers essential DevOps practices, the use of Docker, and CI/CD pipelines.- It highlights operational aspects: deploying/maintaining Angular applications.What I said about the last edition holds true for this edition: "What I like most about this book is that it's very comprehensive and well written. There are a lot of examples and sample code files. In addition, I'm learning about key Angular patterns, tools, and technologies. There's so much content that I'm sure it will be a great reference for a long time."
Amazon Verified review Amazon
shubham kamble Jul 20, 2024
Full star icon Full star icon Full star icon Full star icon Full star icon 5
This book is perfect for any individual or team that is looking to learn how to write scalable, enterprise-grade Angular applications. Uluca provides code samples, design patterns, and and effective narratives around challenging concepts faced by any team leveraging Angular. This book will help you clear all your doubts regarding Angular topics from basic to advanced.Whether you’re just getting started with Angular, or are looking for a solid reference to back up industry experience, this book will be greatly helpful.
Amazon Verified review Amazon
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