Forms, Observables, and Subjects

So far, you've been working with putting together the essential elements that make up an Angular application, such as modules, components, pipes, services, RxJS, unit testing, and environment variables, and even going a step further by learning how to deliver your web application using Docker and giving it a polished look with Angular Material.

At this point, our app is not interactive. It can only pull weather information for one city. As a result, it is not a very useful app. To build an interactive app, we need to be able to handle user input. Enabling user input in your application opens up possibilities for creating great user experiences. Consider google.com's landing page:

Figure 6.1: Google's landing page

In this context, what is Google Search, apart from a simple input field with two buttons? That simple input field unlocks some of the world's most sophisticated and advanced software technologies....