NDC Oslo 2018 - The Year of Web Components

This talk has been given at NDC Oslo in 2018 going into the future of web components and how to get started with it.

Transcript

1. Dominik Kundel | @dkundel | #webComponents #useThePlatform
2. ! " Dominik Kundel | @dkundel | #webComponents #useThePlatform
3. ! " # Dominik Kundel | @dkundel | #webComponents #useThePlatform
4. ! Dominik Kundel | @dkundel | #webComponents #useThePlatform
5. Dominik Kundel | @dkundel | #webComponents #useThePlatform
6. ! The dream <date-picker> </date-picker> <video> </video> <input type="text" /> Dominik Kundel | @dkundel | #webComponents #useThePlatform
7. Dominik Kundel | @dkundel | #webComponents #useThePlatform
8. Dominik Kundel | @dkundel | #webComponents #useThePlatform
9. Dominik Kundel | @dkundel | #webComponents #useThePlatform
10. Dominik Kundel | @dkundel | #webComponents #useThePlatform
11. Hi! I'm Dominik Kundel! Developer Evangelist at ! dkundel.com " @dkundel # dkundel@twilio.com $ github/dkundel Dominik Kundel | @dkundel | #webComponents #useThePlatform
12. Dominik Kundel | @dkundel | #webComponents #useThePlatform
13. ! " How do you share UI between projects? Dominik Kundel | @dkundel | #webComponents #useThePlatform
14. ! Different approaches Dominik Kundel | @dkundel | #webComponents #useThePlatform
15. Approach ! The "Bootstrap" approach Dominik Kundel | @dkundel | #webComponents #useThePlatform
16. Approach 1: "Bootstrap" approach <!-- Bootstrap CSS --> <link rel="stylesheet" href="https: //maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous"> <!-- Optional JavaScript --> <!-- jQuery first, then Popper.js, then Bootstrap JS --> <script src="https: //code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"> </script> <script src="https: //cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"> </script> <script src="https: //maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"> </script> Dominik Kundel | @dkundel | #webComponents #useThePlatform
17. Approach 1: "Bootstrap" approach <div class="alert alert-success" role="alert"> <h4 class="alert-heading">Well done! </h4> <p>Aww yeah, you successfully read this important alert message </p> <hr> <p class="mb-0"> Whenever you need to, be sure to use margin utilities to keep things nice and tidy. </p> </div> Dominik Kundel | @dkundel | #webComponents #useThePlatform
18. Approach ! The JavaScript API Dominik Kundel | @dkundel | #webComponents #useThePlatform
19. Approach 2: JavaScript API <div id="map"> </div> <script> var map; function initMap() { map = new google.maps.Map(document.getElementById('map'), { center: {lat: -34.397, lng: 150.644}, zoom: 8 }); } </script> <script src="https: //maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap" async defer> </script> Dominik Kundel | @dkundel | #webComponents #useThePlatform
20. Approach ! "Share button" style Dominik Kundel | @dkundel | #webComponents #useThePlatform
21. Approach 3: "Share button" style <div id="fb-root"> </div> <script>(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')); </script> Dominik Kundel | @dkundel | #webComponents #useThePlatform
22. Approach 3: "Share button" style <div class="fb-share-button" data-href="https: //developers.facebook.com/docs/plugins/" data-layout="button_count" data-size="small" data-mobile-iframe="true"> <a target="_blank" href="https: // www.facebook.com/sharer/sharer.php?u=https%3A%2F%2Fdevelopers.facebook.com%2Fdocs%2Fplugins%2F&amp;src=sdkpreparse" class="fb-xfbml-parse-ignore">Share </a> </div> Dominik Kundel | @dkundel | #webComponents #useThePlatform
23. ! Poor Developer Experience Dominik Kundel | @dkundel | #webComponents #useThePlatform
24. ! Wrapper Components Dominik Kundel | @dkundel | #webComponents #useThePlatform
25. Dominik Kundel | @dkundel | #webComponents #useThePlatform
26. ! What if we could extend HTMLElement Dominik Kundel | @dkundel | #webComponents #useThePlatform
27. ! ! ! Web Components Dominik Kundel | @dkundel | #webComponents #useThePlatform
28. Spec No. ! ! Custom Elements Dominik Kundel | @dkundel | #webComponents #useThePlatform
29. ! Custom Elements Definition class DatePicker extends HTMLElement { constructor() { super(); // ... } } customElements.define('date-picker', DatePicker); Dominik Kundel | @dkundel | #webComponents #useThePlatform
30. ! Custom Elements Definition class DatePicker extends HTMLInputElement { constructor() { super(); // ... } } customElements.define('date-picker', DatePicker, { extends: 'input' }); Dominik Kundel | @dkundel | #webComponents #useThePlatform
31. ! Custom Elements Usage <!-- normal custom element --> <date-picker> </date-picker> <!-- extended custom element --> <input is="date-picker" /> // via JavaScript document.createElement('date-picker'); document.createElement('input', { is: 'date-picker' }); Dominik Kundel | @dkundel | #webComponents #useThePlatform
32. ! Custom Elements Attributes/Properties Dominik Kundel | @dkundel | #webComponents #useThePlatform
33. ! Custom Elements Attributes <date-picker value="5" disabled> </date-picker> • Allows you to pass information to the component • Only supports "simple" data Dominik Kundel | @dkundel | #webComponents #useThePlatform
34. ! 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 | #webComponents #useThePlatform
35. ! 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 | #webComponents #useThePlatform
36. Spec No. ! ! HTML Templates Dominik Kundel | @dkundel | #webComponents #useThePlatform
37. ! HTML Templates <template id="date-picker-template"> <style> /* ... */ </style> <div> <!-- some markup --> </div> <slot> </slot> <div> <!-- more markup --> </div> </template> const tmpl = document.querySelector('#date-picker-template'); tmpl.content.cloneNode( /*deep: */ true) Dominik Kundel | @dkundel | #webComponents #useThePlatform
38. Spec No. ! ! Shadow DOM Dominik Kundel | @dkundel | #webComponents #useThePlatform
39. ! Shadow DOM class DatePicker extends HTMLElement { constructor() { super(); const shadowRoot = this.attachShadow({mode: 'open'}); shadowRoot.appendChild(tmpl.content.cloneNode(true)); } } Dominik Kundel | @dkundel | #webComponents #useThePlatform
40. ! Shadow DOM <date-picker><p>I appear in the slot </p> </date-picker> <date-picker> #shadow-root <style> /* "global" styles are limited to this root */ </style> <div> <!-- some markup --> </div> <slot> <!-- paragraph appears here --> </slot> <div> <!-- more markup --> </div> </date-picker> Dominik Kundel | @dkundel | #webComponents #useThePlatform
41. Spec No. ! ! HTML Imports Dominik Kundel | @dkundel | #webComponents #useThePlatform
42. Spec No. ! !" HTML Imports Dominik Kundel | @dkundel | #webComponents #useThePlatform
43. ! Support? Dominik Kundel | @dkundel | #webComponents #useThePlatform
44. ✅ Support is there* * with Polyfills Dominik Kundel | @dkundel | #webComponents #useThePlatform
45. ! " Why do I care? Dominik Kundel | @dkundel | #webComponents #useThePlatform
46. ! You develop a UI component Dominik Kundel | @dkundel | #webComponents #useThePlatform
47. ! Same tools for everyone Dominik Kundel | @dkundel | #webComponents #useThePlatform
48. ! Better Developer Experience Dominik Kundel | @dkundel | #webComponents #useThePlatform
49. ! Example 1 WebVR with a-frame ! glitch.com/~aframe-basic-guide Dominik Kundel | @dkundel | #webComponents #useThePlatform
50. ! Demo! Dominik Kundel | @dkundel | #webComponents #useThePlatform
51. ! Example 2 Progressive Enhancement ! web-share-wrapper by Phil Nash Dominik Kundel | @dkundel | #webComponents #useThePlatform
52. ! Example 2: web-share-wrapper <web-share-wrapper text="Share this" sharetitle="This amazing thing was shared" sharetext="You should really click on the link to learn more" shareurl="http: //example.com/amazing" > <a href="https: //twitter.com/intent/tweet?text=Share+Text&amp;url=SHARE_URL"> Share on Twitter </a> </web-share-wrapper> Dominik Kundel | @dkundel | #webComponents #useThePlatform
53. ! Why not earlier? " Dominik Kundel | @dkundel | #webComponents #useThePlatform
54. ! Browser Support Dominik Kundel | @dkundel | #webComponents #useThePlatform
55. ! Low Level API Dominik Kundel | @dkundel | #webComponents #useThePlatform
56. ! Extensible Web Manifesto github.com/extensibleweb/manifesto Dominik Kundel | @dkundel | #webComponents #useThePlatform
57. ! 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 | #webComponents #useThePlatform
58. ! " How The Web Sausage Gets Made by Monica Dinculescu (@notwaldorf) youtube.com/watch?v=326SIMmRjc8 Dominik Kundel | @dkundel | #webComponents #useThePlatform
59. ! Tooling Dominik Kundel | @dkundel | #webComponents #useThePlatform
60. ! Tooling Past Dominik Kundel | @dkundel | #webComponents #useThePlatform
61. ! Tooling Now (a few...) Dominik Kundel | @dkundel | #webComponents #useThePlatform
62. Pick Your Favorite... ! and Let Others Pick Theirs! ! Dominik Kundel | @dkundel | #webComponents #useThePlatform
63. ! Let's build: the last datepicker Dominik Kundel | @dkundel | #webComponents #useThePlatform
64. ! Let's build: the last datepicker a rating component Dominik Kundel | @dkundel | #webComponents #useThePlatform
65. ! OnesieJS ! Dominik Kundel | @dkundel | #webComponents #useThePlatform
66. !!!!! <emoji-rating value="5"> </emoji-rating> Dominik Kundel | @dkundel | #webComponents #useThePlatform
67. ⚒ Our tool of choice: LitElement Dominik Kundel | @dkundel | #webComponents #useThePlatform
68. ⚒ 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 | #webComponents #useThePlatform
69. ! Let's start! Dominik Kundel | @dkundel | #webComponents #useThePlatform
70. ! What about Stencil Dominik Kundel | @dkundel | #webComponents #useThePlatform
71. ! 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 | #webComponents #useThePlatform
72. ! Let's use a web component! Dominik Kundel | @dkundel | #webComponents #useThePlatform
73. ! Let's wrap it up! Dominik Kundel | @dkundel | #webComponents #useThePlatform
74. Think about Web Components for any shared UI Dominik Kundel | @dkundel | #webComponents #useThePlatform
75. Web Components won't limit your framework choices Dominik Kundel | @dkundel | #webComponents #useThePlatform
76. Pick Your Favorite... ! and Let Others Pick Theirs! ! Dominik Kundel | @dkundel | #webComponents #useThePlatform
77. ! One datepicker to rule !em a" ! Dominik Kundel | @dkundel | #webComponents #useThePlatform
78. webcomponents.org Dominik Kundel | @dkundel | #webComponents #useThePlatform
79. custom-elements-everywhere.com Dominik Kundel | @dkundel | #webComponents #useThePlatform
80. github.com/shprink/web-components-todo Dominik Kundel | @dkundel | #webComponents #useThePlatform
81. Resources • ! d-k.im/webcomp-stencil • " d-k.im/webcomp-ndcoslo • #$ github.com/dkundel/emoji-rating • webcomponents.org • ✅ custom-elements-everywhere.com • & github.com/shprink/web-components-todo Dominik Kundel | @dkundel | #webComponents #useThePlatform
82. ! Let me know what you think! ! vote.dkundel.com Dominik Kundel | @dkundel | #webComponents #useThePlatform
83. Thank You! ! Dominik Kundel " vote.dkundel.com # d-k.im/webcomp-ndcoslo $ @dkundel % dkundel@twilio.com & github/dkundel Dominik Kundel | @dkundel | #webComponents #useThePlatform