English versionEN

Web Components in Action

Joren Broekema

Alex Korzhikov

Instructor, Mentor

Recording and certification are available to Multipass and Full ticket holders only

Please login if you have one.

Get Multipass

Bookmark

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

Video transcription and chapters available for users with access.

Available in other languages:

Watch more workshops on topic

Master JavaScript Patterns

JSNation 2024

145 min

Master JavaScript Patterns

Top Content

Featured Workshop

Adrian Hajdin

During this workshop, participants will review the essential JavaScript patterns that every developer should know. Through hands-on exercises, real-world examples, and interactive discussions, attendees will deepen their understanding of best practices for organizing code, solving common challenges, and designing scalable architectures. By the end of the workshop, participants will gain newfound confidence in their ability to write high-quality JavaScript code that stands the test of time.
Points Covered:
1. Introduction to JavaScript Patterns2. Foundational Patterns3. Object Creation Patterns4. Behavioral Patterns5. Architectural Patterns6. Hands-On Exercises and Case Studies
How It Will Help Developers:
- Gain a deep understanding of JavaScript patterns and their applications in real-world scenarios- Learn best practices for organizing code, solving common challenges, and designing scalable architectures- Enhance problem-solving skills and code readability- Improve collaboration and communication within development teams- Accelerate career growth and opportunities for advancement in the software industry

best practices javascript patterns

Integrating LangChain with JavaScript for Web Developers

React Summit 2024

92 min

Integrating LangChain with JavaScript for Web Developers

Featured Workshop

Vivek Nayyar

Dive into the world of AI with our interactive workshop designed specifically for web developers. "Hands-On AI: Integrating LangChain with JavaScript for Web Developers" offers a unique opportunity to bridge the gap between AI and web development. Despite the prominence of Python in AI development, the vast potential of JavaScript remains largely untapped. This workshop aims to change that.Throughout this hands-on session, participants will learn how to leverage LangChain—a tool designed to make large language models more accessible and useful—to build dynamic AI agents directly within JavaScript environments. This approach opens up new possibilities for enhancing web applications with intelligent features, from automated customer support to content generation and beyond.We'll start with the basics of LangChain and AI models, ensuring a solid foundation even for those new to AI. From there, we'll dive into practical exercises that demonstrate how to integrate these technologies into real-world JavaScript projects. Participants will work through examples, facing and overcoming the challenges of making AI work seamlessly on the web.This workshop is more than just a learning experience; it's a chance to be at the forefront of an emerging field. By the end, attendees will not only have gained valuable skills but also created AI-enhanced features they can take back to their projects or workplaces.Whether you're a seasoned web developer curious about AI or looking to expand your skillset into new and exciting areas, "Hands-On AI: Integrating LangChain with JavaScript for Web Developers" is your gateway to the future of web development. Join us to unlock the potential of AI in your web projects, making them smarter, more interactive, and more engaging for users.

javascript devtools developer experience

Using CodeMirror to Build a JavaScript Editor with Linting and AutoComplete

React Day Berlin 2022

86 min

Using CodeMirror to Build a JavaScript Editor with Linting and AutoComplete

Top Content

WorkshopFree

2 authors

Using a library might seem easy at first glance, but how do you choose the right library? How do you upgrade an existing one? And how do you wade through the documentation to find what you want?
In this workshop, we’ll discuss all these finer points while going through a general example of building a code editor using CodeMirror in React. All while sharing some of the nuances our team learned about using this library and some problems we encountered.

javascript build tools

Testing Web Applications Using Cypress

TestJS Summit - January, 2021

173 min

Testing Web Applications Using Cypress

WorkshopFree

Gleb Bahmutov

This workshop will teach you the basics of writing useful end-to-end tests using Cypress Test Runner.
We will cover writing tests, covering every application feature, structuring tests, intercepting network requests, and setting up the backend data.
Anyone who knows JavaScript programming language and has NPM installed would be able to follow along.

testing javascript cypress e2e testing

React Server Components Unleashed: A Deep Dive into Next-Gen Web Development

React Day Berlin 2023

149 min

React Server Components Unleashed: A Deep Dive into Next-Gen Web Development

Workshop

Maurice de Beijer

Get ready to supercharge your web development skills with React Server Components! In this immersive, 3-hour workshop, we'll unlock the full potential of this revolutionary technology and explore how it's transforming the way developers build lightning-fast, efficient web applications.
Join us as we delve into the exciting world of React Server Components, which seamlessly blend server-side rendering with client-side interactivity for unparalleled performance and user experience. You'll gain hands-on experience through practical exercises, real-world examples, and expert guidance on how to harness the power of Server Components in your own projects.
Throughout the workshop, we'll cover essential topics, including:- Understanding the differences between Server and Client Components- Implementing Server Components to optimize data fetching and reduce JavaScript bundle size- Integrating Server and Client Components for a seamless user experience- Strategies for effectively passing data between components and managing state- Tips and best practices for maximizing the performance benefits of React Server Components

javascript react server components

0 to Auth in an Hour Using NodeJS SDK

Node Congress 2023

63 min

0 to Auth in an Hour Using NodeJS SDK

WorkshopFree

Asaf Shen

Passwordless authentication may seem complex, but it is simple to add it to any app using the right tool.
We will enhance a full-stack JS application (Node.JS backend + React frontend) to authenticate users with OAuth (social login) and One Time Passwords (email), including:- User authentication - Managing user interactions, returning session / refresh JWTs- Session management and validation - Storing the session for subsequent client requests, validating / refreshing sessions
At the end of the workshop, we will also touch on another approach to code authentication using frontend Descope Flows (drag-and-drop workflows), while keeping only session validation in the backend. With this, we will also show how easy it is to enable biometrics and other passwordless authentication methods.
Table of contents- A quick intro to core authentication concepts- Coding- Why passwordless matters
Prerequisites- IDE for your choice- Node 18 or higher

javascript node.js authentication

Check out more articles and videos

We constantly think of articles and videos that might spark Git people interest / skill us up or help building a stellar career

Scaling Up with Remix and Micro Frontends

Remix Conf Europe 2022

23 min

Scaling Up with Remix and Micro Frontends

Top Content

Adrien Baron

Maker of clashofstats.com, Vue GWT and Tiny Frontend

This talk discusses the usage of Microfrontends in Remix and introduces the Tiny Frontend library. Kazoo, a used car buying platform, follows a domain-driven design approach and encountered issues with granular slicing. Tiny Frontend aims to solve the slicing problem and promotes type safety and compatibility of shared dependencies. The speaker demonstrates how Tiny Frontend works with server-side rendering and how Remix can consume and update components without redeploying the app. The talk also explores the usage of micro frontends and the future support for Webpack Module Federation in Remix.

remix javascript micro-frontends architecture

Full Stack Components

Remix Conf Europe 2022

37 min

Full Stack Components

Top Content

Kent C. Dodds

Creator of EpicWeb.dev, EpicReact.Dev, TestingJavaScript.com

RemixConf EU discussed full stack components and their benefits, such as marrying the backend and UI in the same file. The talk demonstrated the implementation of a combo box with search functionality using Remix and the Downshift library. It also highlighted the ease of creating resource routes in Remix and the importance of code organization and maintainability in full stack components. The speaker expressed gratitude towards the audience and discussed the future of Remix, including its acquisition by Shopify and the potential for collaboration with Hydrogen.

remix javascript fullstack architecture

Debugging JS

React Summit 2023

24 min

Debugging JS

Top Content

Watch video: Debugging JS

Mark Erikson

Replay.io

Debugging JavaScript is a crucial skill that is often overlooked in the industry. It is important to understand the problem, reproduce the issue, and identify the root cause. Having a variety of debugging tools and techniques, such as console methods and graphical debuggers, is beneficial. Replay is a time-traveling debugger for JavaScript that allows users to record and inspect bugs. It works with Redux, plain React, and even minified code with the help of source maps.

best practices case study javascript web development debug

Making JavaScript on WebAssembly Fast

JSNation Live 2021

29 min

Making JavaScript on WebAssembly Fast

Top Content

Lin Clark

Fastly

WebAssembly enables optimizing JavaScript performance for different environments by deploying the JavaScript engine as a portable WebAssembly module. By making JavaScript on WebAssembly fast, instances can be created for each request, reducing latency and security risks. Initialization and runtime phases can be improved with tools like Wiser and snapshotting, resulting in faster startup times. Optimizing JavaScript performance in WebAssembly can be achieved through techniques like ahead-of-time compilation and inline caching. WebAssembly usage is growing outside the web, offering benefits like isolation and portability. Build sizes and snapshotting in WebAssembly depend on the application, and more information can be found on the Mozilla Hacks website and Bike Reliance site.

javascript webassembly

Webpack in 5 Years?

JSNation 2022

26 min

Webpack in 5 Years?

Top Content

Tobias Koppers

Webpack and Turbopack Creator

In the last 10 years, Webpack has shaped the way we develop web applications by introducing code splitting, co-locating style sheets and assets with JavaScript modules, and enabling bundling for server-side processing. Webpack's flexibility and large plugin system have also contributed to innovation in the ecosystem. The initial configuration for Webpack can be overwhelming, but it is necessary due to the complexity of modern web applications. In larger scale applications, there are performance problems in Webpack due to issues with garbage collection, leveraging multiple CPUs, and architectural limitations. Fixing problems in Webpack has trade-offs, but a rewrite could optimize architecture and fix performance issues.

javascript webpack builders and founders

Towards a Standard Library for JavaScript Runtimes

Node Congress 2022

34 min

Towards a Standard Library for JavaScript Runtimes

Top Content

James Snell

Workers team @Cloudflare

There is a need for a standard library of APIs for JavaScript runtimes, as there are currently multiple ways to perform fundamental tasks like base64 encoding. JavaScript runtimes have historically lacked a standard library, causing friction and difficulty for developers. The idea of a small core has both benefits and drawbacks, with some runtimes abusing it to limit innovation. There is a misalignment between Node and web browsers in terms of functionality and API standards. The proposal is to involve browser developers in conversations about API standardization and to create a common standard library for JavaScript runtimes.

javascript component library node.js