Angular Architecture Overview
Angular is a modern framework for creating HTML and TypeScript client-side apps. The TypeScript was used to create it. A set of TypeScript Libraries that you import into the application provides functionality.
An angular application is defined by sets of NgModules, which offer a compilation environment for components. A root module must always be present for an application to be bootstrapped.
Some key points to remember in Angular:
- Components define views, which are collections of screen components that Angular can select and modify based on the logic and data in your program.
- Components rely on services to offer functionality that isn't directly connected to views. Service providers can be used as dependencies in components, which makes your code more modular, reusable, and efficient.
- Metadata defines a template's view in a component. A template is made up of HTML, Angular Directives, and sometimes some binding markups that allow Angular to alter HTML before rendering it for display.
- Angular uses metadata in a Service Class to send information to the components via dependency injection (DI)
A typical application view consists of a hierarchy of components grouped from header to footer. The Router service that comes with Angular helps define navigation pathways across views.
Module:
A module in Angular is a group of connected components that can be defined for specialized application functionality.
Every Angular application has a root module, commonly referred to as the AppModule, that offers a bootstrap method for launching the app. A typical Angular application is made up of some functional components.
NgModules, like Core JavaScript modules, can import and export functionality from other modules. The Router module, for example, is loaded when the route service is needed in our application.
Some features, such as lazy loading, can be readily accomplished by carefully arranging our programs into modules.
Components:
At least one component is required in an Angular application, the root component, which connects a component hierarchy to the page document object model (DOM). An Angular component consists of an HTML template that defines the view to be displayed in the target environment and a class for the application data and functionality.
Templates, Directives and Data Binding:
A template is made up of HTML and Angular markup. HTML elements can be modified with Angular Markups before they are displayed.
Binding markup binds your application data to the DOM, while template directives give program logic. Data binding can be divided into two categories:
- Event binding allows your program to respond to user interaction in the target environment by dynamically altering its data.
- Property binding allows you to use HTML to interpolate values computed from your application data.
In Angular, the template's directives and binding syntax are assessed before a view is displayed, and the HTML and DOM are updated according to the program data and logic.
Angular also supports two-way data binding, which means that changes in the DOM, such as user preferences, are mirrored in the program data.
The Angular application's Piping Feature can also be used to improve the user experience. Depending on the user's location, Pipes can show Dates and currency.
Services and Dependency Injection(DI):
A service class can be built when data or logic is not associated with a specific view and has to be shared between components. The @Injectable() decorator comes before the service class definition. The decorator provides the metadata that enables your service to be injected as a dependency into client components.
You may keep your component classes small and efficient by using dependency injection (DI). They outsource activities like fetching data from the server, validating user input, and logging into the console to services.
Routing:
The Angular Router NgModule is a service that allows you to design a navigation path between your application's various states and view hierarchies. It follows the same navigational conventions as most browsers:
- When you type a URL into the address bar, the browser will take you to that page.
- The browser navigates to a new page when you click links on the page.
- The browser navigates backward and forwards through the history of pages you've seen when using the back and advance buttons.
Instead of pages, the router maps URL-like pathways to views. The router intercepts the browser's activity when a user makes an action that would load a new page in the browser, such as clicking a link, and shows or conceals view hierarchies.
If the router judges that the current application state necessitates a specific feature but the module that defines it hasn't been loaded, the router can load the module on demand.
The router evaluates a link URL based on your app's view navigation rules and data state. When the user clicks a button, picks from a dropbox, or responds to any other stimuli, you can navigate to new views. The back and forward buttons operate because the router registers the browser's history activity.
You associate navigation pathways with your components to set navigation rules. In the same way that template syntax integrates your views with your program data, a path uses a URL-like syntax to integrate your program data. You can use program logic to pick which views to show or conceal in response to user input and access criteria.
Conclusion:
In this article we learned the fundamentals of the basic building components of an Angular application. Let's go over some of the Angular concepts we discussed.
- An Angular view is defined by a component and a template.
- A decorator on a component class adds metadata and a reference to the associated template.
- In a component's template, directives and binding markup change views based on program data and logic.
- The dependency injector gives a component services, such as a router service that allows you design view navigation.
Next Article: Differences Between Angular And AngularJS