Angular View Encapsulation | How It Works And When To Use It

With hands-on experience starting from AngularJS to the latest version of the Angular framework, we render effective IT Consulting services to both, the technical as well as outsourcing sectors. A few times, we have worked with AngularJS for our clients. Given the development in technology, we have moved to work with the latest Angular frameworks.

Essentially, which includes amazing features compared to the old AngularJS. One of them is that Angular uses Typescript, a superset of the JavaScript language, which provides effortless results in web development. Be that as it may, Angular is an open-source JavaScript framework, developed and maintained by Google. Its goal is to enhance web-based applications.

More so, with MVVM capability. With two-way data binding and regular DOM, Angular can be executed completely at the client’s site. It makes it easy to build real-time applications because it has a two-way data binding feature. It is an extremely reliable and flexible framework to develop single-page applications like Gmail. Our expert developers are key leaders here.

They have created innovative ways of developing Angular-based customized and sustainable web, desktop, and mobile applications that are scalable and reliable for various business verticals.

Understanding How Angular Usually Works In Cloud Computing

Angular is a popular JavaScript framework that offers developers a powerful toolset for building dynamic and scalable web applications. Written in TypeScript, this free and open-source framework is specifically designed for building single-page applications using HTML and TypeScript.

At the core of Angular’s architecture are the services, which allow developers to share code and data across different components of an application. Essentially, services are reusable classes that are instantiated only once during the lifetime of an application. This means that data stored within a service remains available throughout the application, without the need for constant refreshing.

By using services, developers can maintain a consistent set of methods and properties across different components, making it easier to manage complex data and business logic. In fact, the main purpose of using services in Angular is to organize and share business logic, models, or data and functions with different types of components of an entire Angular application.

Angular services are also designed to be highly encapsulated, which means that they can be used to control how data and functionality are shared across different components. The Component’s decorator provides encapsulation options that can be used to fine-tune this process on a per-component basis.

Hence, Angular Development Services is an essential part of the framework’s architecture, providing developers with a powerful tool for building dynamic and scalable web applications. By encapsulating data and functionality within reusable classes, developers can easily manage complex data and business logic across different components of an application, making it easier to maintain and update code over time.

Getting To Know The Main Angular Lifecycle Hooks

By definition, Angular Lifecycle Hooks are special functionalities that allow us to “hook into” and run code at a specific lifecycle event of a component or directive. Angular manages components and directives for us when it creates them, updates them, or destroys them. A component instance has a lifecycle that starts when Angular instantiates the component class.

And then, it renders the component view along with its child views. The lifecycle continues with change detection, as Angular checks to see when data-bound properties change, and updates both the view and the component instance as needed. The lifecycle ends when Angular destroys the component instance and removes its rendered template from the DOM.

Directives have a similar lifecycle, as Angular creates, updates, and destroys instances in the course of execution. Your app can use lifecycle hook methods to tap into key events in the lifecycle of a component or directive to initialize new instances, initiate change detection when needed, respond to updates during change detection, and clean up before the deletion of instances.

The main hooks:

ngOnChanges

• This method is called when the value of the data-bound property changes.

ngOnInit

• This is called on initialization of the component after Angular first displays the data-bound properties happens.

ngDoCheck

• This hook detects the custom modifications made by the developer and changes that angular can’t or won’t detect on its own.

ngAfterContentChecked

• This is called when the project into the component’s content is updated or checked for updates.

ngAfterContentInit

• This is called when the component’s content ngContent is initialized after the angular project’s content into the component’s view.

ngAfterViewInit

• This is called when the component’s projected view has been initialized.

ngAfterViewChecked

• This is called after the angular checks the component’s view has been checked.

ngOnDestroy

• This lifecycle is called when a directive, pipe, component, or service is destroyed.

Advantage of Angular

There are several benefits that have prompted clients all across the world to Hire Angular Developers for their businesses. Among the most important are:

• Angular enables client-server communication, speeding up the development of dynamic web applications.
• Angular’s pre-built components and libraries allow for a faster web application development process.
• Angular’s two-way data binding automatically synchronizes data between the model and view, simplifying development.
• Consistency is a key benefit of Angular, ensuring that web applications are built to a high standard.
• Angular’s maintainability makes it easier to update and modify web applications over time.

Disadvantage of Angular

• Inadequate execution of dynamic applications is a common issue.
• Learning Angular can be challenging.
• Security can be a concern with Angular.
• Memory leaks can occur with Angular.

Angular features

• TypeScript-based, free, and open-source web application framework.
• Used for building single-page applications using HTML and TypeScript.
• Offers pre-built components and libraries for faster development.
• Supports two-way data binding for automatic synchronization of data.
• Facilitates client-server communication for dynamic web applications.
• Ensures consistency in web application development.
• Offers maintainability for easier updates and modifications.
• Can have a learning curve for beginners.
• Memory management and security in Angular can be concerns.

Angular directives

• Component directives
• Structural directives
• Attribute directives

In Angular, a component’s styles can be encapsulated within the component’s host element so that they don’t affect the rest of the application. The Component decorator provides the encapsulation option which can be used to control how the encapsulation is applied on a per-component basis.

What Is Angular View Encapsulation?

Angular View Encapsulation is a behavior where component CSS styles are encapsulated into the component’s view. It means the style defined in one component will not be applied in another component. View Encapsulation in Angular defines how the styles in the template affect the other parts of the application. There are the top 3 strategies that Angular uses.

They are as follows:

1. ViewEncapsulation.Emulated.
2. ViewEncapsulation.ShadowDOM.
3. ViewEncapsulation.None.

Putting it in simple words, to understand ViewEncapsulation In Angular, Shadow DOM brings Encapsulation to HTML Elements. Using the Shadow DOM, markup, styles, and behaviors are scoped to the element and do not clash with other nodes of the DOM. Shadow DOM is part of Web Components, which encapsulates styles and login of elements.

The template and styles defined within the component are defined by view encapsulation and can affect the whole application or vice versa. In general, it’s clear to note that Angular Components are three things.

Including:

1. Component Class
2. Template
3. Style

The combination of three factors makes an angular component reusable across an application. You can also use browsers, which do not support the shadow DOM because angular has its own emulation and it can emulate the shadow DOM.

Add view encapsulation to components: –

Encapsulation methods are added using the encapsulation metadata of the @component decorator below:

ViewEncapsulation. Emulated is the default encapsulation method.

Example application:-

 Create an angular application

 Open app.component.html

 Style.css

As you can see, from the image below, there are three Angular View Encapsulation Types.

Including:

1. Emulated
2. Native
3. None

Emulated:

• Angular utilizes style encapsulation instead of shadow DOM, allowing for unique HTML attributes to be added to component CSS styles and markup for encapsulation.
• This encapsulation strategy, known as “emulated,” is the default setting in Angular and ensures that third-party components with potentially conflicting styles do not affect the rest of the application.
• Component styles are added to the <head> of the document, making them available throughout the application, but their selectors only affect elements within their respective components’ templates.
• The @Component decorator in Angular defines styles that are scoped only to that specific component, preventing those styles from bleeding into other parts of the application.
• While Angular’s encapsulation approach may differ from other frameworks, its implementation is powerful and effective in preventing style conflicts and ensuring a consistent user experience.

Example:

Create a component in the angular app and name it View Emulated Component. As shown below

Native:-

• Angular offers a native shadow DOM view encapsulation option that is easy to understand and implement. Essentially, it enables the use of native shadow DOM within Angular.
• This approach utilizes the style encapsulation technique, known as shadow DOM, for native encapsulation.
• With this approach, the styles of components are added only to the shadow DOM host, ensuring that they are only applied to elements within the respective component’s views and not affecting other parts of the application.
• As a result, styles defined within a component are scoped only to that component and do not spread to other HTML components, providing a more robust and maintainable application.

Example:

None:-

• Angular doesn’t use shadow DOM for None encapsulation.
• When using None encapsulation, the styles of all components will be duplicated in components with native encapsulation.
• With None encapsulation, the styles are added to the <head> of the document and become completely global, affecting all matching elements in the document.
• If a component has styles defined using None encapsulation, they will be visible to all components in the application.

Example:

Create a new component ViewNoneComponent

Summary Notes:

In conclusion, Angular View Encapsulation is a powerful feature that allows developers to control the scope of styles and templates in their applications. There are three types of encapsulation strategies: Emulated, Native, and None, each with its own strengths and weaknesses. Emulated encapsulation is the default strategy, and it emulates the shadow DOM.

Specifically, in order to achieve style encapsulation. Native encapsulation uses the native shadow DOM to achieve style encapsulation, and None encapsulation does not use any encapsulation at all. When using Emulated or Native encapsulation, styles are scoped to the component, ensuring that they only affect elements within their respective component’s views.

Styles defined in a component’s @Component decorator are scoped to that component only. On the other hand, when using None encapsulation, styles are added to the <head> of the document, making them completely global and affecting any matching elements within the document.

Overall, understanding Angular view encapsulation is crucial for developing scalable and maintainable applications. By choosing the right encapsulation strategy and using it effectively, developers can ensure that their styles and templates are well-organized and do not interfere with other components in the application.