Angular supports the decomposition of components by allowing you to include one into another. To test a component that contains other elements you have to declare them in the test configuration. Don’t forget about any @Input property of an aggregated component or running the test suite will result with the following error: Template parse errors: Can’t bind to property since it isn’t a known property of component
An Angular app is served by a different host than a Spring Boot API, so reaching for data via REST API will result in the following error: “Failed to load http://localhost:8080/api: No ‘Access-Control-Allow-Origin’ header is present on the requested resource. Origin ‘http://localhost:4200’ is therefore not allowed access.” Read this post to learn how to configure Cross-origin resource sharing (CORS) to enable the cross-domain communication on a development environment.
In a multi module application Spring Boot should surrender routing control to Angular, otherwise trying to access any route other than the root page will result in a Whitelabel Error Page: “There was an unexpected error (type=Not Found, status=404)”
Check out the example of a multi-layout Angular application templates complemented with Bootstrap styles.
In case of complex projects it is often expected to provide different layouts adapted to the needs of users – the logged-in user requires different UI elements than the guest. We have to customise the appearance of applications time and again taking into account many various aspects. Angular allows you to organise the presentation layer to easily handle multiple layouts.
With Angular CLI you can bootstrap a new project effortlessly. Let’s create a new Angular 6 application complemented with Bootstrap 4 and Sass preprocessor.
Developing a multi-module application where the backend runs on Spring Boot and the frontend is powered by Angular is far less complicated than one might expect. Check out how you can build such a project and manage it as a single jar file.
Material Design for Bootstrap 4 provides an Angular Bootstrap UI KIT. It’s built with Angular 6, Bootstrap 4 and TypeScript and can immediately transform the look and fell of your application. Let’s add its features to an Angular project.
Angular can maintain any of the major CSS preprocessors. By default the new project is created with the css support, but even after its creation, you can easily switch to sass or less. You can also adjust the preprocessor globally, for all new projects.