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The State of Web Components
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Shogo Sensui
September 24, 2017
Technology
9
8.9k
The State of Web Components
2017年9月24日に開催された HTML5 Conference 2017 の「The State of Web Components」のセッション資料です。
Shogo Sensui
September 24, 2017
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Transcript
)5.-$POGFSFODF 4IPHP4FOTVJBLB!DI 5IF4UBUFPG8FC$PNQPOFOUT
!DI
‣ 4IPHP4FOTVJ ‣ ؎ٝة٦طحزדכDIדׅ ‣ $ZCFS"HFOU *OD ‣ 8FC*OJUJBUJWF$FOUFS ‣
4PGUXBSF&OHJOFFS ‣ 8FC䪮遭Ⰻ菙ָ㥨ֹדׅ ‣ 044崞⹛׃גתׅ
馄鸞劤ָ⳿תׅ 涪㡰✮㹀
8IZ8FC$PNQPOFOUT
)5.- $44 8FC涪罏
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)5.- $44 +BWB4DSJQUתה➬穈ָזְ ‣ תה鿇ㅷꂁ䋒ׅؒ؝ءأذيָזַ
نةٝ⡲חכ˘ GBODZCVUUPO
<button> fancy button </button> button { background: #0086b3; color: white;
padding: 1em; border-radius: 0.5em; border: none; } )5.-ה$44剅ֽל0,
GBODZCVUUPO
GBODZCVUUPO GBODZCVUUPO
<button class="a"> fancy button </button> <button class="b"> fancy button </button>
button { color: white; padding: 1em; border-radius: 0.5em; border: none; } button.a { background: #0086b3; } button.b { background: #008080; }
GBODZCVUUPO GBODZCVUUPO
GBODZCVUUPO GBODZCVUUPO GBODZCVUUPO
GBODZCVUUPO GBODZCVUUPO GBODZCVUUPO PWBM TRVBSF
fancy button </button> <button class="b"> fancy button </button> <button class="c">
fancy button </button> <button class="oval"> oval </button> <button class="square"> border-radius: 0.5em; border: none; } button.a { background: #0086b3; } button.b { background: #008080; } button.oval { ... }
GBODZCVUUPO GBODZCVUUPO GBODZCVUUPO PWBM TRVBSF
<fancy-button color="a"> fancy button </fancy-button> <fancy-button color="b"> fancy button </fancy-button>
<fancy-button color="c"> fancy button </fancy-button> <oval-button>oval</oval-button> <square-button>square</square-button>
4IBEPX%0. $VTUPN&MFNFOUT 5FNQMBUFT )5.-*NQPSUT ˟׳התד
˟䎃猧植㖈 4IBEPX%0. $VTUPN&MFNFOUT 5FNQMBUFT &4.PEVMFT
4IBEPX%0.
4IBEPX%0.הכ ‣ )5.-ծ$44ծ+BWB4DSJQUך䕦갟眔㔲ꣲ㹀ׅ ‣ مأزהז銲稆חTIBEPX3PPU欰װ׃ծך⚥ד饯ֿֿה4IBEPX %0.ⰻח殅 ‣ 4IBEPX%0.㢩鿇ַך䕦갟ꣲ㹀ׅ ‣ TIBEPX3PPUפך،ؙإأꣲ㹀涸ח׃ծ䮶莸ְ䬐⥂ׅ
‣ TIBEPX3PPUפ،ؙإأדֹPQFOٌ٦سהծ黪倖ׅDMPTFEٌ٦سָ֮
const button = document.querySelector('button'); const shadowRoot = button.attachShadow({ mode: 'open'
// or 'close' }); // readonly property console.log(button.shadowRoot); 4IBEPX%0.ך欰װ׃倯
GBODZCVUUPO ⢽ִלְֲֲֿنةٝ
<button> fancy button </button> ֲֿ剅ֽءٝفٕ˘ <style> button { background: #0086b3;
color: white; padding: 1em; border-radius: 0.5em; border: none; }ɹ </style>
<button> #shadow-root fancy button </button> <style> button { background: #0086b3;
color: white; padding: 1em; border-radius: 0.5em; border: none; } </style> <button> <slot></slot> </button>
<button> #shadow-root fancy button </button> <style> button { background: #0086b3;
color: white; padding: 1em; border-radius: 0.5em; border: none; }ɹ </style> <button> <slot></slot> </button>
<button> #shadow-root fancy button </button> <style> button { background: #0086b3;
color: white; padding: 1em; border-radius: 0.5em; border: none; } </style> <button> <slot></slot> </button> 4DPQFE
$VTUPN&MFNFOUT
$VTUPN&MFNFOUTהכ ‣ 杝荈ך)5.-銲稆㹑鎉ׅ ‣ )5.-ד㹑鎉涸חⵃ欽דֹ ‣ %0."1*鸐ׄגㄏ⟀涸חⵃ欽דֹ ‣ ⟣䠐ך䮶莸ְ㹀纏ׅ ‣
㹀纏ׁٓ؎ؿ؟؎ؙٕؿحؙׅ
class FancyButton extends HTMLElement { constructor() { ... } connectedCallback()
{ ... } disconnectedCallback() { ... } attributeChangedCallback() { ... } adoptedCallback() { ... } } ؕأةي銲稆ٓ؎ؿ؟؎ؙٕ
䖞勻ך8FC鿇ㅷךⱄⵃ欽 ‣ 鿇ㅷ圓䧭ׅ)5.-鎸鶢ׅ ‣ $44ח״أة؎ؚٔٝ黝欽ׅ ‣ $44ؿ؋؎ٕٗ٦سׅծTUZMF銲稆剅ֻծFUD ‣ +BWB4DSJQUח״䮶莸ְ黝欽ׅ ‣
+BWB4DSJQUؿ؋؎ٕٗ٦سׅծTDSJQU銲稆剅ֻծFUD
GBODZCVUUPO نةٝ⢪ְְ˘
.fancy { background: #0086b3; color: white; padding: 1em; border-radius: 0.5em;
border: none; } CVUUPODTT
CVUUPOKT document .querySelector('.fancy') .addEventListener('click', () => { //... });
<button class="fancy"> fancy button </button> JOEFYIUNM
<link rel="stylesheet" href="button.css"> ... <button class="fancy"> fancy button </button> ...
<script src="button.js"></script> 穈さׇג⢪ֲ
None
class FancyButton extends HTMLElement { connectedCallback() { this.innerHTML = `
<style>button { … }</style> <button>fancy button</button> `; } } customElements .define('fancy-button', FancyButton);
<fancy-button> fancy button </fancy-button> GBODZCVUUPO GBODZCVUUPO⢪ִ
<fancy-button> <style> button { background: #0086b3; color: white; padding: 1em;
border-radius: 0.5em; border: none; } </style> <button> fancy button </button> </fancy-button> /PUTDPQFE
4IBEPX%0. $VTUPN&MFNFOUT
class FancyButton extends HTMLElement { connectedCallback() { this.innerHTML = `
<style>button { … }</style> <button>fancy button</button> `; } } customElements .define('fancy-button', FancyButton);
class FancyButton extends HTMLElement { connectedCallback() { this.shadowRoot.innerHTML = `
<style>button { … }</style> <button><slot></slot></button> `; } } customElements .define('fancy-button', FancyButton);
<fancy-button> <style> button { background: #0086b3; color: white; padding: 1em;
border-radius: 0.5em; border: none; } </style> <button> fancy button </button> </fancy-button>
<fancy-button> #shadow-root <style> button { background: #0086b3; color: white; padding:
1em; border-radius: 0.5em; border: none; } </style> <button> <slot></slot> </button> fancy button </fancy-button> 4DPQFE
5FNQMBUFT
5FNQMBUFTהכ ‣ ꬊ崞䚍ז)5.-銲稆㹑鎉ׅ ‣ ذٝفٖ٦زה׃ג)5.-銲稆䪔ִ ‣ 䖞勻ךعحؙ涸ז،فٗ٦ثׇ׆ח幥
<div style="display:none;"> <p>This is an image</p> <img src="foo.jpg" alt=""> </div>
4FOEBSFRVFTU
<script type="text/template"> <p>This is an image</p> <img src="foo.jpg" alt=""> </script>
&WBMXJUIJOOFS)5.-
<template> <p>This is an image</p> <img src="foo.jpg" alt=""> </template> *OFSU✨
4IBEPX%0. $VTUPN&MFNFOUT 5FNQMBUFT
class FancyButton extends HTMLElement { connectedCallback() { this.shadowRoot.innerHTML = `
<style>button { … }</style> <button><slot></slot></button> `; } } customElements .define('fancy-button', FancyButton);
<template> <style>button { … }</style> <button><slot></slot></button> </template> <script> class FancyButton
extends HTMLElement { // ... } customElements .define('fancy-button', FancyButton); </script>
<link rel="import" href="fancy-button.html"> <fancy-button> fancy button </fancy-button>
)5.-*NQPSUT… IUUQTHJUIVCDPNXDXFCDPNQPOFOUTJTTVFTJTTVFDPNNFOU
)5.-.PEVMFT… IUUQTHJTUHJUIVCDPN5BLBZPTIJ,PDIJGEDFEGECCEBGFGF
import fancy from './fancy.html' as HTMLTemplateElement; export class FancyButton extends
HTMLElement { connectedCallback() { this.attachShadow({ mode: 'open' }).appendChild(fancy.content.cloneNode(true)); } }
&4.PEVMFT
&4.PEVMFTהכ ‣ &4.PEVMFTךـٓؐؠ㹋鄲 ‣ TDSJQUUZQFˑNPEVMF˒ד+BWB4DSJQUؿ؋؎ٕٗ٦سׅ ‣ TDSJQUOPNPEVMFדꬊ㼎䘔橆㞮罋䣁ׅ ‣ &4.PEVMFTך/PEFKT㹋鄲 ‣
NKT&4.PEVMFTך+BWB4DSJQUؿ؋؎ٕה׃גٗ٦سׅ
export default class FancyButton { ... } GBODZCVUUPOKT
import React from 'react'; import ReactDOM from 'react-dom'; import PropTypes
from 'prop-types'; import FancyButton from './fancy-button.js'; JOEFYKT
<script type="module"> import FancyButton from './fancy-button.js'; customElements .define('fancy-button', FancyButton); </script>
4IBEPX%0. $VTUPN&MFNFOUT &4.PEVMFT
class FancyButton extends HTMLElement { connectedCallback() { this.attachShadow({ mode: 'open'
}).innerHTML = ` <style>button { … }</style> <button><slot></slot></button> `; } } customElements .define('fancy-button', FancyButton);
export default class FancyButton extends HTMLElement { connectedCallback() { this.attachShadow({
mode: 'open' }).innerHTML = ` <style>button { … }</style> <button><slot></slot></button> `; } }
<fancy-button> fancy button </fancy-button> <script type="module"> import FancyButton from './fancy-button.js';
customElements .define('fancy-button', FancyButton); </script>
8FCחֶֽ鿇ㅷךꨇ׃ׁ ‣ )5.-ה$44חأ؝٦فָ㶷㖈׃זְ ‣ 铣鴥$44ך䕦갟眔㔲ָ鎘濼זְ ‣ せ瑞ָ遼瑱׃זְ״ֲծ䌢ח䠐陎ׅ䗳銲ָ֮ ‣ ⡲鿇ㅷⱄⵃ欽׃חְֻ ‣
)5.- $44 +BWB4DSJQUתה➬穈ָזְ ‣ תה鿇ㅷꂁ䋒ׅؒ؝ءأذيָזַ
4IBEPX%0. $VTUPN&MFNFOUT &4.PEVMFT OQN ZBSO 8FCחֶֽ鿇ㅷךꨇ׃ׁ ‣ )5.-ה$44חأ؝٦فָ㶷㖈׃זְ ‣ 铣鴥$44ך䕦갟眔㔲ָ鎘濼זְ
‣ せ瑞ָ遼瑱׃זְ״ֲծ䌢ח䠐陎ׅ䗳銲ָ֮ ‣ ⡲鿇ㅷⱄⵃ欽׃חְֻ ‣ )5.- $44 +BWB4DSJQUתה➬穈ָזְ ‣ תה鿇ㅷꂁ䋒ׅؒ؝ءأذيָזַ
1PMZNFS4VNNJU JO$PQFOIBHFO
#PXFSJTEFQSFDBUFE
6TFOQN ZBSO
// fancy-button v1.0.0 customElements .define('fancy-button', FancyButton); // fancy-button v1.1.0 customElements
.define('fancy-button', FancyButton); ZBSO⢪ֲץֹ椚歋 ☠ ⣛㶷ٌآُ٦ٕؿٓحزזخٔ٦ד鍑寸דֹ✨
‣ #SPXTFS4VQQPSU ‣ "DDFTTJCJMJUZ ‣ -PBE1FSGPSNBODF ‣ 3FOEFS1FSGPSNBODF
8FC$PNQPOFOUTTBOECPY IUUQTDIHJUIVCJPXFCDPNQPOFOUTTBOECPY
‣ #SPXTFS4VQQPSU ‣ "DDFTTJCJMJUZ ‣ -PBE1FSGPSNBODF ‣ 3FOEFS1FSGPSNBODF
✅ ✅ $VTUPN&MFNFOUTW 4IBEPX%0.W 5FNQMBUFT &4.PEVMFT ✅ ✅ ✅ ✅
✅ ✅ ✅ ✅ ✅ ✅ 䎃猧ـٓؐؠ؟ه٦ز
8FC$PNQPOFOUT JT BWBJMBCMFOPX PO UIFNPCJMFXFC✨
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:PV5VCFJTCVJMU POUIFUPQPG1PMZNFS
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6TFXFCDPNQPOFOUTKT ‣ $VTUPN&MFNFOUTWךهٔؿ؍ٕ ‣ 4IBEZ%0.4IBEPX%0.ך%0."1*هٔؿ؍ٕ ‣ 4IBEZ$444IBEPX%0.ךأة؎ٕꟼ鸬هٔؿ؍ٕ ‣ )5.-*NQPSUT
8IZ4IBEZ%0. ‣ %0.خٔ٦ך،ؙإ؟ⵖ䖴ׅךָꨇ׃ְ ‣ ぐ珏%0."1*װ/PEF-JTUךؒىُٖ٦زָꨇ׃ְ ‣ EPDVNFOUCPEZ瘝ך،ؙإ؟♳剅ֹדֹזְ ‣ ؝٦سꆀָ花㣐חז♳ծػؿؓ٦وٝأח䕦갟ׅ
‣ 4IBEZ%0."1*➜׃ג،ؙإأׇׁ ‣ 㸜㹀䚍⥂אאծػؿؓ٦وٝأ⳿ׅ
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8FC$PNQPOFOUT JTBMTP BWBJMBCMFOPX PO UIFEFTLUPQXFC
‣ #SPXTFS4VQQPSU ‣ "DDFTTJCJMJUZ ‣ -PBE1FSGPSNBODF ‣ 3FOEFS1FSGPSNBODF
"DDFTTJCJMJUZ ‣ 4IBEPX%0.ך)5.-،ؙإءـٕח ‣ 鸐䌢ך%0.ず圫חծإوٝذ؍ؙأ䠐陎ׅ ‣ )5.-ֽד♶⼧ⴓז㜥さכծ8"*"3*"ד؟ه٦زׅ ‣ 孡חזךכأ؝٦فⰻפך،ؙإأ ‣
4IBEPX%0.ָꪪ⳿ׁגְֽ ‣ ،ؙإءؽٔذ؍ָ⡚ְ؝ٝه٦طٝز⢪ֲ㜥さכ˘
<fancy-button> #shadow-root fancy button </fancy-button> <style> button { background: #0086b3;
color: white; padding: 1em; border-radius: 0.5em; border: none; } </style> <button> <slot></slot> </button> &YQPTFE
<fancy-button> #shadow-root fancy button </fancy-button> <style> div { background: #0086b3;
color: white; padding: 1em; border-radius: 0.5em; border: none; } </style> <div role="button" tabindex="0"> <slot></slot> </div> &YQPTFE
‣ #SPXTFS4VQQPSU ‣ "DDFTTJCJMJUZ ‣ -PBE1FSGPSNBODF ‣ 3FOEFS1FSGPSNBODF
-PBE1FSGPSNBODF ‣ TDSJQUח״؝ٝه٦طٝزךٗ٦س ‣ ؙٔؒأز侧כ)551ד֮ל孡ח׃ֺׅזֻג葺ְ ‣ ؝ٝه٦طٝزך+BWB4DSJQUؿ؋؎ٕכNJOJGZׅ ‣ UZQFˑNPEVMF˒㾩䚍ח״EFGFSٗ٦س ‣
ؔفءّٝדBTZOD㾩䚍➰♷דֹ
TDSJQUח״ぐ珏ٗ٦س IUUQTIUNMTQFDXIBUXHPSHNVMUJQBHFTDSJQUJOHIUNMUIFTDSJQUFMFNFOU
ثُ٦صؚٝه؎ٝز ‣ ٔا٦أ㙵鴥ךַٍؗحءُׅךַ ‣ 㙵鴥כ剑傍ֻٖٝتֲָׁؚٔٝծⴱ劍ٗ٦سָ曯暨חז ‣ ״כ$BDIF$POUSPMقحتװ4FSWJDF8PSLFSזודٍؗحءُ׃ְ ‣ ⴱ劍ٗ٦س傍ְ ‣
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‣ #SPXTFS4VQQPSU ‣ "DDFTTJCJMJUZ ‣ -PBE1FSGPSNBODF ‣ 3FOEFS1FSGPSNBODF
3FOEFS1FSGPSNBODF ‣ -JHIU%0.ה4IBEPX%0.ך䊴 ‣ 4IBEPX%0.ךךךכـٓؐؠ㹋鄲ך剑黝⻉ח㨻י״ֲ ‣ ע㣐䊴כזְ⦐➂ך✮䟝דׅ ‣ 7JSUVBM%0.ח״䊴ⴓ䲽歗ך⡭㖑 ‣
➙תד鸐3FBDUזוך7JFXٓ؎ـٓٔה穈さׇ ‣ 8FC$PNQPOFOUTⰻד䊴ⴓ䲽歗㹋倵ׅ
import React from 'react'; export default class Button extends React.Component
{ handleClick(e) { if (this.props.onClick) { this.props.onClick(e); } } render() { const handleClick = this.handleClick.bind(this); return ( <fancy-button onClick={handleClick}> {this.props.children} </fancy-button> ); } }
1PMZNFS-BCTMJUIUNM ‣ 5BHHFE5FNQMBUF-JUFSBMדUFNQMBUF⢪ֲ➬穈 ‣ IUNMAAדذٝفٖ٦ز⡲ծSFOEFS ד)5.-欰䧭ׅ ‣ SFOEFS ד床ׅ⹛涸ז鿇ⴓך䊴ⴓ䲽歗ׅ
const helloTemplate = (name) => html`<div>Hello ${name}!</div>`; // renders <div>Hello
Steve!</div> to the document body render(helloTemplate('Steve'), document.body); // updates to <div>Hello Kevin!</div>, but only updates the ${name} part render(helloTemplate('Kevin'), document.body);
import { html, render } from './lit-html.js'; export default class
IconButton extends HTMLElement { connectedCallback() { this.attachShadow({ mode: 'open' }); render(this.template, this.shadowRoot); } get template() { return html` <style>...</style> <button> <i class="${this.getAttribute('icon')}"></i> <slot></slot> </button> `; } };
תה ‣ 8FC$PNQPOFOUTחꟼׅぐ珏➬圫ָ㸜㹀׃גֹ ‣ ـٓؐؠ㹋鄲滠㹋ח鹌ծ暴חٌغ؎ٕ8FCדכه ٔؿ؍ٕז׃ד⢪ִ ‣ ➙⢪גְ䪮遭أةحؙח《鴥דְֽ ‣ ـٓؐؠⰻ鿇Ⳣ椚ך剑黝⻉䖉אאծطحزٙ٦ؙ
ꟼ鸬כ㛇劤ח屟ثُ٦صؚٝד0,
:PVBSFSFBEZUPVTF 8FC$PNQPOFOUT✨
5IBOLZPV !DI "DI