Web Components: What, Why, How, When

@stopsatgreen WEB COMPONENTS What, Why, How, When #WCLDN, 04/03

@stopsatgreen @stopsatgreen Peter Gasston broken-links.com

@stopsatgreen WEB COMPONENTS

@stopsatgreen http://en.wikipedia.org/wiki/H%C3%A9lio_Oiticica

@stopsatgreen

@stopsatgreen WHAT?

@stopsatgreen “The component model for the Web.”

@stopsatgreen A suite of technologies for making reusable UI controls
or services.

@stopsatgreen Fundamental change to the way we build the Web.

@stopsatgreen

@stopsatgreen ® The Lego Group

@stopsatgreen Custom Elements + Shadow DOM + HTML Imports +
Templates = Web Components

@stopsatgreen WHY?

@stopsatgreen

@stopsatgreen OOCSS BEM Java Applets Dynamic Drive React Ember jQuery
UI Bootstrap Web Components

@stopsatgreen W3C WHATWG

@stopsatgreen

@stopsatgreen • jQuery : querySelector(), classList • Modernizr : @supports
• Sass : --custom-properties()

@stopsatgreen Let us make the tools we need.

@stopsatgreen #extendthewebforward http://extensiblewebmanifesto.org/

@stopsatgreen <flex-carousel> <prev-next> <show-position> <open-lightbox>

@stopsatgreen http://msdn.microsoft.com/library/ie/ms531426.aspx

@stopsatgreen

@stopsatgreen meaningful naming + modularisation + encapsulation + sharing =
web components

@stopsatgreen HOW?

@stopsatgreen Custom Elements

@stopsatgreen <fun-times></fun-times> document.registerElement('fun-times');

@stopsatgreen <fun-times></fun-times> = HTMLElement <funtimes></funtimes> = HTMLUnknownElement

@stopsatgreen fun-times:unresolved {…}

@stopsatgreen proto = Object.create(HTMLElement.prototype); proto.hooray = function() {…}; document.registerElement('fun-times',  {
prototype: proto }); funTimes = document.querySelector('fun-times');  funTimes.hooray();

@stopsatgreen proto = Object.create(HTMLElement.prototype); proto.createdCallback = function() {…}; document.registerElement('fun-times',  {
prototype: proto });

@stopsatgreen <button is="fun-times"></button> proto = Object.create(HTMLButtonElement.prototype); proto.hooray = function() {…};
document.registerElement('fun-times', { prototype: proto, extends: 'button' });

@stopsatgreen Shadow DOM

@stopsatgreen

@stopsatgreen var root = foo.createShadowRoot();  root.innerHTML = '<div>…</div>';

@stopsatgreen Templates

@stopsatgreen <template id="party">…</template> var party = document.getElementById('party'); var partyContent =
party.content;

@stopsatgreen var funTimes = document.querySelector('fun-times'); var proto = Object.create(HTMLElement.prototype); proto.hooray
= function() {…}; proto.createdCallback = function() { var party = document.getElementById('party'); var clone = document.importNode(party.content,true); var root = funTimes.createShadowRoot(); root.appendChild(clone); } document.registerElement('fun-times', { prototype: proto });

@stopsatgreen HTML Imports

@stopsatgreen <link rel="import" href="fun-times.htm">

@stopsatgreen http://leafletjs.com/

@stopsatgreen <leaf-map lat="33.9186805" lon="8.1198406"></leaf-map> <link rel="import" href="leaflet-map.htm">

@stopsatgreen But it’s not all rosy.

@stopsatgreen The is="" pattern. https://lists.w3.org/Archives/Public/public-webapps/2015JanMar/0206.html

@stopsatgreen <button is="fun-times"></button> <h1 is="h-7"></h1> <iframe is="new-button"></iframe>

@stopsatgreen document.registerElement('fun-times'); var funRoot = funTimes.createShadowRoot(); funRoot.innerHTML = '<button>…</button>';

@stopsatgreen HTML Imports have huge potential for performance problems…

@stopsatgreen /path/to/library.min.js  /path/to/a/library.min.js

@stopsatgreen <link rel="import" href="//foo.com/btn-a.htm">  <link rel="import" href="//bar.com/btn-b.htm">  <link rel="import" href="//baz.com/btn-c.htm">

@stopsatgreen … so Firefox won’t implement.

@stopsatgreen WHEN?

@stopsatgreen Browser Custom Elements Shadow DOM HTML Imports Template Who
knows? ‘Under consideration’ ✓ ✓ ✓ ✓ ✓ ✗ ✓ ✓ ✓ http://jonrimmer.github.io/are-we-componentized-yet/

@stopsatgreen Web Components will happen. Maybe not in this form,
but the concept is solid.

@stopsatgreen

webcomponents.js (polyfills) Polymer Core Bosonic Core Elements Brick Paper Elements
Elements polymer-project.org | brick.mozilla.io | bosonic.github.io | webcomponents.org Standard

@stopsatgreen Web Components vs. React (etc)

@stopsatgreen Everything Useful Useful & well-made Crap http://en.wikipedia.org/wiki/Sturgeon%27s_law

@stopsatgreen Sturgeon’s Law: 90% of everything is crap

@stopsatgreen http://addyosmani.com/first/

@stopsatgreen http://www.paciellogroup.com/blog/2014/09/web-components-punch-list/

@stopsatgreen Web Components are for you to drive the future
of the web. Please drive responsibly.

@stopsatgreen THE END

Web Components: What, Why, How, When

Web Components: What, Why, How, When

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