RuhrJS '18 - 2018 - The Year of Web Components

Components are hot. Every view library or framework seems to be based on components these days. But when you write your React component you can't share it with an Angular developer. Your Vue components can't be used in Preact. The result: fragmentation. The cost: reinventing the wheel for every library.

We've had the answer for years, though. Web components are the standards based solution, but they've never seemed ready for the big time. Until now.

In this talk we'll look at why 2018 is finally the year of web components, the tools and libraries that we can use to build with web components and how you can get started building shareable, compatible, standards based components.

Transcript

1. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform
2. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform Did you ever write front-end code?
3. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform Did you ever write a date picker?
4. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform That’s the problem!
5. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform Over 1200 Date Pickers!
6. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform The Dream <date-picker> </date-picker> <video> </video> <input type="text" />
7. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform
8. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform
9. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform
10. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform
11. Dominik Kundel | @dkundel | #ruhrjs | console.log(` Hi! I’m Dominik Kundel `); dkundel.com @dkundel dkundel@twilio.com github/dkundel Developer Evangelist && JavaScript Hacker #webComponents #useThePlatform
12. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform
13. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform How do you share UI between projects?
14. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform Different approaches
15. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform 1. The “Bootstrap” approach
16. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform 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>
17. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform 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>
18. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform 2. The JavaScript API
19. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform 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>
20. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform 3. “Share button” style
21. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform 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>
22. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform 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>
23. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform Poor Development Experience
24. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform Wrapper Components
25. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform Library Fragmentation
26. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform What if we could extend HTMLElement
27. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform Web Components
28. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform Spec No. 1 Custom Elements
29. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform Custom Elements Definition class DatePicker extends HTMLElement { constructor() { super(); // ... } } customElements.define('date-picker', DatePicker);
30. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform Custom Elements Definition class DatePicker extends HTMLInputElement { constructor() { super(); // ... } } customElements.define( 'date-picker', DatePicker, { extends: 'input' } );
31. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform 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' });
32. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform Custom Elements Attributes vs Properties
33. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform Custom Elements Attributes • Allows you to pass information to the component • Only supports “simple” data <date-picker value="5" disabled> </date-picker>
34. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform Custom Elements Properties • Access via JavaScript • Typically reflected back into attributes but doesn't have to • Supports complex data (arrays, objects, etc.) const el = document.querySelector('date-picker'); el.value = 99; el.disabled = false; el.range = ['2018-01-01', '2019-01-01'];
35. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform 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'); } } // ... }
36. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform Spec No. 2 HTML Templates
37. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform 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)
38. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform Spec No. 3 Shadow DOM
39. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform Shadow DOM class DatePicker extends HTMLElement { constructor() { super(); const shadowRoot = this.attachShadow({mode: 'open'}); shadowRoot.appendChild(tmpl.content.cloneNode(true)); } }
40. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform 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>
41. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform Spec No. 4 HTML Imports
42. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform Spec No. 4 HTML Imports
43. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform Support?
44. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform * with Polyfills It’s well supported!*
45. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform Why would I care?
46. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform You develop a UI component
47. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform Same tools for everyone
48. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform Better Developer Experience
49. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform Example 1: WebVR with a-frame
50. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform glitch.com/~aframe-basic-guide
51. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform Example 2: Progressive Enhancement
52. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform 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>
53. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform Why not earlier?
54. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform 1. Browser Support
55. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform 2. Low Level API
56. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform Extensible Web Manifesto
57. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform 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.
58. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform How The Web Sausage Gets Made by Monica Dinculescu (@notwaldorf) youtube.com/watch?v=326SIMmRjc8
59. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform 3. Tooling
60. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform Tooling Past
61. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform Tooling Now (a few…)
62. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform Pick Your Favorite… Let Others Pick Theirs! and
63. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform Let’s build: the last date picker
64. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform Let’s build: the last date picker a rating component
65. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform OnesieJS
66. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform <emoji—rating value="4"> </emoji-rating>
67. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform Our tool of choice: LitElement
68. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform 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 *Except module bundling https: //github.com/Polymer/lit-element
69. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform Let’s Start!
70. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform What about… Stencil
71. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform 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 https: //stenciljs.com
72. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform Summary Photo by Jan Kahánek on Unsplash
73. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform Web Components for any shared UI Think about
74. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform Web Components won’t limit your framework choices
75. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform Pick Your Favorite… Let Others Pick Theirs! and
76. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform webcomponents.org
77. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform custom-elements-everywhere.com
78. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform custom-elements-everywhere.com
79. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform github.com/shprink/web-components-todo
80. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform Resources • d-k.im/webcomp-stencil • d-k.im/ruhrjs • github.com/dkundel/emoji-rating • webcomponents.org • ✅ custom-elements-everywhere.com • github.com/shprink/web-components-todo
81. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform vote.dkundel.com Let me know what you think!
82. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform hacktoberfest.digitalocean.com
83. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform www.twilio.com/quest
84. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform Stickers!!
85. Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform vote.dkundel.com Let me know what you think!
86. console.log(` Thank You! `); dkundel.com @dkundel dkundel@twilio.com github/dkundel d-k.im/ruhrjs Dominik Kundel | @dkundel | #ruhrjs | #webComponents #useThePlatform