React Alicante '18 - 2018 - The Year of Web Components

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Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! " Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! " # Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! The dream Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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Hi! I'm Dominik Kundel! Developer Evangelist at ! dkundel.com " @dkundel # [email protected] $ github/dkundel Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! " How do you share UI between projects? Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! Diﬀerent approaches Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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Approach ! The "Bootstrap" approach Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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Approach 1: "Bootstrap" approach Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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Approach 1: "Bootstrap" approach

Well done!

Aww yeah, you successfully read this important alert message

Whenever you need to, be sure to use margin utilities to keep things nice and tidy.

Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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Approach ! The JavaScript API Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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Approach 2: JavaScript API

var map; function initMap() { map = new google.maps.Map(document.getElementById('map'), { center: {lat: -34.397, lng: 150.644}, zoom: 8 }); } Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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Approach ! "Share button" style Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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Approach 3: "Share button" style

(function(d, s, id) { var js, fjs = d.getElementsByTagName(s)[0]; if (d.getElementById(id)) return; js = d.createElement(s); js.id = id; js.src = 'https: //connect.facebook.net/en_US/sdk.js#xfbml=1&version=v2.12&appId=APP_ID&autoLogAppEvents=1'; fjs.parentNode.insertBefore(js, fjs); }(document, 'script', 'facebook-jssdk')); Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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Approach 3: "Share button" style

Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! Poor Developer Experience Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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!" Hey Dom! You are doing it wrong! Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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Use React! import React, { Component } from 'react'; import FacebookProvider, { ShareButton } from 'react-facebook'; export default class Example extends Component { render() { return ( ); } } Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! Wrapper Components Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! What if we could extend HTMLElement Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! ! ! Web Components Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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Spec No. ! ! Custom Elements Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! Custom Elements Deﬁnition class DatePicker extends HTMLElement { constructor() { super(); // ... } } customElements.define('date-picker', DatePicker); Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! Custom Elements Deﬁnition class DatePicker extends HTMLInputElement { constructor() { super(); // ... } } customElements.define('date-picker', DatePicker, { extends: 'input' }); Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! Custom Elements Usage // via JavaScript document.createElement('date-picker'); document.createElement('input', { is: 'date-picker' }); Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! Custom Elements Attributes/Properties Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! Custom Elements Attributes • Allows you to pass information to the component • Only supports "simple" data Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! Custom Elements Properties const el = document.querySelector('date-picker'); el.value = 99; el.disabled = false; el.range = ['2018-01-01', '2019-01-01']; • Access via JavaScript • Typically reﬂected back into attributes but doesn't have to • Supports complex data (arrays, objects, etc.) Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! Custom Elements Properties class DatePicker extends HTMLElement { // ... get disabled() { return this.hasAttribute('disabled'); } set disabled(val) { // Reflect the value of `disabled` as an attribute. if (val) { this.setAttribute('disabled', ''); } else { this.removeAttribute('disabled'); } } // ... } Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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Spec No. ! ! HTML Templates Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! HTML Templates /* ... */

const tmpl = document.querySelector('#date-picker-template'); tmpl.content.cloneNode( /*deep: */ true); Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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Spec No. ! ! Shadow DOM Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! Shadow DOM class DatePicker extends HTMLElement { constructor() { super(); const shadowRoot = this.attachShadow({ mode: 'open' }); shadowRoot.appendChild(tmpl.content.cloneNode(true)); } } Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! Shadow DOM

I appear in the slot

#shadow-root /* "global" styles are limited to this root */

Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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Spec No. ! ! HTML Imports Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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Spec No. ! !" HTML Imports Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! Support? Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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✅ Support is there* * with Polyﬁlls Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! " Why do I care? Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! You develop a UI component Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! Same tools for everyone Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! Better Developer Experience Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! Example 1 WebVR with a-frame ! glitch.com/~aframe-basic-guide Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! Demo! Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! Example 2 Progressive Enhancement ! web-share-wrapper by Phil Nash Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! Example 2: web-share-wrapper Share on Twitter Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! Why not earlier? " Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! Browser Support Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! Low Level API Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! Extensible Web Manifesto github.com/extensibleweb/manifesto Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! Extensible Web Manifesto • The standards process should focus on adding new low-level capabilities to the web platform that are secure and eﬃcient. • The web platform should expose low-level capabilities that explain existing features, such as HTML and CSS, allowing authors to understand and replicate them. Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! " How The Web Sausage Gets Made by Monica Dinculescu (@notwaldorf) youtube.com/watch?v=326SIMmRjc8 Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! Tooling Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! Tooling Past Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! Tooling Now (a few...) Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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Pick Your Favorite... ! and Let Others Pick Theirs! ! Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! Let's build: the last datepicker Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! Let's build: the last datepicker a rating component Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! OnesieJS ! Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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!!!!! Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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⚒ Our tool of choice: LitElement Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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⚒ About LitElement • Written by the Polymer Team • "A simple base class for creating custom elements rendered with lit- html" • Uses web standards (no compilation)* • lit-html is powered by HTML templates • ! https://github.com/Polymer/lit-element * Except module bundling Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! Let's start! Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! What about Stencil Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! What about Stencil • Stencil was written by the Ionic Team • "compiler that generates web components" • Built to bring Ionic to more frameworks than Angular • Inspired by Angular, React and others • Uses TypeScript, decorators, and JSX • ! stenciljs.com Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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My ﬁrst Stencil Component import { Component, Prop } from '@stencil/core'; @Component({ tag: 'my-first-component', styleUrl: 'my-first-component.scss', }) export class MyComponent { // Indicate that name should be a public property on the component @Prop() name: string; render() { return

My name is {this.name}

; } } Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! I love React though! Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! I love React though! class XSearch extends HTMLElement { connectedCallback() { const mountPoint = document.createElement('span'); this.attachShadow({ mode: 'open' }).appendChild(mountPoint); const name = this.getAttribute('name'); const url = 'https: // www.google.com/search?q=' + encodeURIComponent(name); ReactDOM.render({name} , mountPoint); } } customElements.define('x-search', XSearch); Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! Let's use a web component! Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! Let's wrap it up! Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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Think about Web Components for any shared UI Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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Web Components won't limit your framework choices Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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Pick Your Favorite... ! and Let Others Pick Theirs! ! Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! One datepicker to rule !em a" ! Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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webcomponents.org Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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custom-elements-everywhere.com Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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github.com/shprink/web-components-todo Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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Resources • ! d-k.im/webcomp-stencil • " d-k.im/webcomp-reactalicante • #$ github.com/dkundel/emoji-rating • webcomponents.org • ✅ custom-elements-everywhere.com • & github.com/shprink/web-components-todo Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! Let me know what you think! ! vote-react.dkundel.com Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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Thank You! ! Dominik Kundel " vote-react.dkundel.com # d-k.im/webcomp-reactalicante $ @dkundel % [email protected] & github/dkundel Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform

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! d-k.im/vote-react-backup Dominik Kundel | @dkundel | #ReactAlicante #webComponents #useThePlatform