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Web Components in Action

Joren Broekema

Alex Korzhikov

Instructor, Mentor

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The workshop extends JavaScript programming language knowledge, overviews general software design patterns. It is focused on Web Components standards and technologies built on top of them, like Lit-HTML and Lit-Element. We also practice writing Web Components both with native JavaScript and using Lit-Element. In the end we overview key tooling to develop an application - open-wc.

This workshop has been presented at JSNation Live 2021, check out the latest edition of this JavaScript Conference.

FAQ

Web components are a set of web platform APIs that allow developers to create custom, encapsulated HTML tags for use in web pages and applications. These components are reusable across different projects and can be used in conjunction with various frameworks or as standalone components.

Styles can be applied to web components using CSS. Inside a Shadow DOM, styles are scoped to the component, preventing external styles from affecting the component's internal styles. Developers can expose parts of the component for external styling using CSS custom properties or the 'part' attribute, providing hooks for style customization.

Yes, web components can be integrated with frameworks like React. However, React does not fully support property bindings for custom elements natively. Tools like 'reactify-wc' can be used to bridge this gap, enabling seamless integration of web components into React applications.

One of the main challenges in adopting web components is the encapsulation of styles within the Shadow DOM, which can restrict the application of global styles and frameworks like Bootstrap or Tailwind CSS. Additionally, web components require careful management of properties and events to ensure compatibility across different browsers and frameworks.

Dynamic styles within web components can be managed using CSS custom properties. These properties allow developers to define variable values that can be dynamically changed through JavaScript, offering a flexible way to adjust styles based on component state or user interactions.

The 'slot' feature in web components is a placeholder inside a component's template that can be filled with user-defined content. This allows for flexible content projection within a web component, where specific parts of the component's DOM can be replaced or enhanced by the user.

Yes, web components can be extended or customized by defining new classes that inherit from existing custom elements. This allows developers to build upon base functionality, modify behaviors, or add new features to existing components, promoting reusability and modularity.

javascript web components

Joren Broekema

Alex Korzhikov

184 min

18 Jun, 2021

Comments

Video Summary and Transcription

Web Components are a set of HTML, CSS, and JavaScript specifications that include custom elements, Shadow DOM, HTML templates, and ECMAScript modules. They offer a way to create reusable and encapsulated components. The use of Lit, a library by Google, simplifies the creation of web components by providing useful features like tagged template literals and lifecycle methods. Shadow DOM allows for isolated DOM and styling encapsulation, while slots provide a way to replace and nest elements. Custom CSS properties enable dynamic styling, and Lit elements can be used in frameworks like React.

Available in Español: Componentes Web en Acción

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