Future js - A whirlwind tour of web components

5/3/2014 FutureJS - Web components

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Web componentsA whirlwind tour



¡Hola!



What I do

Centralway

@geekonaut

http://www.centralway.com/

https://twitter.com/g33konaut



I am from ZurichWhich isn't as boring as you may think...



...take that, Winter!



Buggy method, tho



Anyway...



Let's talk about Web components

Image CC-BY-SA 2.0 by Alan Chia, Source

http://www.flickr.com/photos/13403905@N03/2080281038/



Let's talk about HTML

Lego ad from 1978



We need to move forward quickly

vs



A sample: Filterable list <div class="filterList"> <label for="filterTerm">Search for: </label> <input id="filterTerm"> <ul> <li>Chuck Norris doesn't call the wrong number. You answer the wrong phone.</li> <li>Chuck Norris has been to Mars; that's why there are no signs of life.</li> <li>Chuck Norris refers to himself in fourth person.?</li> <li>Chuck Norris once leaned against a tower in Pisa, Italy.</li> <li>To keep is his mind sharp Chuck Norris plays Tic‑Tac‑Toe versus himself. He wins every time.</li> <li>Light is so fast, because it tries to escape Chuck Norris (but that obviously fails)</li> <li>The average room bears 73658 ways for Chuck Norris to kill you, including just the room itself.</li> </ul> </div> <script> document.getElementById("filterTerm").addEventListener("keyup", function() { var items = document.querySelectorAll(".filterList li");



How to go on from here?1. Keep it a Javascript hack2. Try to implement it directly in the browser's codebases3. Try to get it standardized



But then again...

Source: @stevefaulkner

https://twitter.com/stevefaulkner/status/458643254024888320



Web components Standards:Template elementShadow DOMCustom elementsHTML imports

Go read the intro here

http://w3c.github.io/webcomponents/explainer/



Build new HTML elementsusing HTML, CSS & Javascript



Template elements<template> <script> console.log("Hi!"); </script> <h1></h1></template>

<button id="add">Make a headline</button>

<script> document.getElementById("add").addEventListener("click", function() { var tplContent = document.querySelector("template").content; tplContent.querySelector("h1").textContent = window.prompt("Headline"); document.body.appendChild(tplContent.cloneNode(true)); });</script>



Shadow DOM<template> <script> console.log("Hi!"); </script> <h1></h1></template>

<button id="add">Make a headline</button><button id="test">Test for headlines</button>

<script> document.getElementById("add").addEventListener("click", function() { var tplContent = document.querySelector("template").content.cloneNode(true); tplContent.querySelector("h1").textContent = window.prompt("Headline");

var container = document.createElement("div");



Custom elements<template> <script> console.log("Hi."); </script> <h1></h1></template>

<button id="add">Make a headline</button><button id="test">Test for headlines</button>

<script> var elemPrototype = Object.create(HTMLElement.prototype);

elemPrototype.createdCallback = function() { console.log("Created element"); this.root = this.createShadowRoot();



HTML imports<link rel="import" href="filterlist.html">

<filter‑list> <li>Chuck Norris doesn't call the wrong number. You answer the wrong phone.</li> <li>Chuck Norris has been to Mars; that's why there are no signs of life.</li> <li>Chuck Norris refers to himself in fourth person.?</li> <li>Chuck Norris once leaned against a tower in Pisa, Italy.</li> <li>To keep is his mind sharp Chuck Norris plays Tic‑Tac‑Toe versus himself. He wins every time.</li> <li>Light is so fast, because it tries to escape Chuck Norris (but that obviously fails)</li> <li>The average room bears 73658 ways for Chuck Norris to kill you, including just the room itself.</li></filter‑list>



It's already in your browser.Sorta.



Browser support

Source: are-we-componentized-yet, captured 03.05.14

http://jonrimmer.github.io/are-we-componentized-yet/



Useful stuffPolyfill & frameworks

PolymerX-Tags

Try it

BrickCustomElements.ioMozilla AppMaker

http://www.polymer-project.org/

http://www.x-tags.org/

http://mozilla.github.io/brick/

http://customelements.io/

https://apps.webmaker.org/



Thank you!Questions?

Slides: avgp.github.io/futurejs2014@geekonautBlog @ ox86.tumblr.comThx to Centralway!

http://avgp.github.io/futurejs2014

https://twitter.com/g33konaut

https://ox86.tumblr.com/

https://centralway.com/

Future js - A whirlwind tour of web components

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