Book Image

Building Large-Scale Web Applications with Angular

By : Chandermani Arora, Kevin Hennessy, Christoffer Noring, Doguhan Uluca
Book Image

Building Large-Scale Web Applications with Angular

By: Chandermani Arora, Kevin Hennessy, Christoffer Noring, Doguhan Uluca

Overview of this book

<p>If you have been burnt by unreliable JavaScript frameworks before, you will be amazed by the maturity of the Angular platform. Angular enables you to build fast, efficient, and real-world web apps. In this Learning Path, you'll learn Angular and to deliver high-quality and production-grade Angular apps from design to deployment.</p> <p>You will begin by creating a simple fitness app, using the building blocks of Angular, and make your final app, Personal Trainer, by morphing the workout app into a full-fledged personal workout builder and runner with an advanced directive building - the most fundamental and powerful feature of Angular.</p> <p>You will learn the different ways of architecting Angular applications using RxJS, and some of the patterns that are involved in it. Later you’ll be introduced to the router-first architecture, a seven-step approach to designing and developing mid-to-large line-of-business apps, along with popular recipes. By the end of this book, you will be familiar with the scope of web development using Angular, Swagger, and Docker, learning patterns and practices to be successful as an individual developer on the web or as a team in the Enterprise.</p> <p>This Learning Path includes content from the following Packt products:</p> <p><span style="background-color: transparent;">•Angular 6 by Example by Chandermani Arora, Kevin Hennessy&nbsp;</span><br /><span style="background-color: transparent;">•Architecting Angular Applications with Redux, RxJS, and NgRx by Christoffer Noring</span><br /><span style="background-color: transparent;">•Angular 6 for Enterprise-Ready Web Applications by Doguhan Uluca</span></p>
Table of Contents (23 chapters)
Title Page
Copyright
Contributors
About Packt
Preface
Index

Using Angular Services and HttpClient to retrieve data


Now you need to connect your CurrentWeather component to the OpenWeatherMap APIs. In the upcoming sections, we will go over the following steps to accomplish this goal:

  1. Create a new Angular Service
  2. Import HttpClientModule and inject it into the service
  3. Discover the OpenWeatherMap API

 

  1. Create a new interface that conforms to the shape of the API
  2. Write a get request
  3. Inject the new service into the CurrentWeather component
  4. Call the service from the init function of the CurrentWeather component
  5. Finally, map the API data to the local ICurrentWeather type using RxJS functions so that it can be consumed by your component

Creating a new Angular Service

Any code that touches outside of the boundaries of a component should exist in a service; this includes inter-component communication, unless there's a parent-child relationship, and API calls of any kind and any code that cache or retrieve data from a cookie or the browser's localStorage. This is a critical...