Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Collaborative JS
Search
Ben Foxall
August 10, 2016
Technology
1
170
Collaborative JS
How to build a collaborative browser-based editor (and why)
Ben Foxall
August 10, 2016
Tweet
Share
More Decks by Ben Foxall
See All by Ben Foxall
Web Sites & Fairy Lights
benfoxall
0
120
Making Simple Things
benfoxall
2
250
Simpler Things
benfoxall
0
1.8k
Using Browsers to Visualise Data
benfoxall
0
81
Serving Data From Browsers
benfoxall
0
66
Building multi-device interfaces with the web
benfoxall
1
170
Other Decks in Technology
See All in Technology
Kubernetes self-healing of your workload
hwchiu
0
260
「れきちず」のこれまでとこれから - 誰にでもわかりやすい歴史地図を目指して / FOSS4G 2025 Japan
hjmkth
1
330
難しいセキュリティ用語をわかりやすくしてみた
yuta3110
0
340
「最速」で Gemini CLI を使いこなそう! 〜Cloud Shell/Cloud Run の活用〜 / The Fastest Way to Master the Gemini CLI — with Cloud Shell and Cloud Run
aoto
PRO
0
130
初めてのDatabricks Apps開発
taka_aki
1
210
『バイトル』CTOが語る! AIネイティブ世代と切り拓くモノづくり組織
dip_tech
PRO
1
130
Oracle Base Database Service 技術詳細
oracle4engineer
PRO
12
81k
20251007: What happens when multi-agent systems become larger? (CyberAgent, Inc)
ornew
1
490
OCIjp_Oracle AI World_Recap
shinpy
1
110
サイバーエージェント流クラウドコスト削減施策「みんなで金塊堀太郎」
kurochan
4
2.2k
Building a cloud native business on open source
lizrice
0
120
新規事業におけるGORM+SQLx併用アーキテクチャ
hacomono
PRO
0
440
Featured
See All Featured
The Art of Programming - Codeland 2020
erikaheidi
56
14k
XXLCSS - How to scale CSS and keep your sanity
sugarenia
249
1.3M
VelocityConf: Rendering Performance Case Studies
addyosmani
332
24k
Reflections from 52 weeks, 52 projects
jeffersonlam
353
21k
Done Done
chrislema
185
16k
Art, The Web, and Tiny UX
lynnandtonic
303
21k
How to Create Impact in a Changing Tech Landscape [PerfNow 2023]
tammyeverts
55
3k
The Psychology of Web Performance [Beyond Tellerrand 2023]
tammyeverts
49
3.1k
KATA
mclloyd
PRO
32
15k
A better future with KSS
kneath
239
18k
A Tale of Four Properties
chriscoyier
161
23k
Refactoring Trust on Your Teams (GOTO; Chicago 2020)
rmw
35
3.2k
Transcript
HELLO! I'm @benjaminbenben!
I work at @Pusher
None
I co-organise @JSOxford
None
I've not really said this stuff yet 1. Tell me
if we've been here too long 2. I'd be happy (and sorry) if you tell me this is rubbish
Live coding across all the things
Live coding across all the things
How to build a collaborative browser-based editor (and why)
䡿 Browser-based editors
None
side note - not just frontend
None
cojs.co
!
/
/ 䡿 The challenges
None
The challenges —Making a textarea feel nice —Showing content —Code
transpilation —External modules —Not breaking things
/ 䡿 The challenges Making a textarea feel nice
Web based code editors (maybe don't write one yourself) —Ace
Editor —Monaco —CodeMirror —~Atom~
None
Integration with our textarea CodeMirror.fromTextArea(source)
…tonnes more stuff
/ 䡿 The challenges Showing content <iframe id="target" href="/mypage"></iframe> (normal
answer: host it somewhere) !
Option 1.
"Upload" to ServiceWorker Web page → Service Worker → Network
hmmmmm —trendy —cool —persistant urls —overkill possibly —support is …
positive? —really cool
Option 2.
Data URIs
data:[<mediatype>][;base64],<data>
data:text/html,<h1>Hello! !
iframe.src = 'data:text/html;charset=utf-8,'+ '%3Cbody%3E%3Cscript%3E' + encodeURI(source.value) + '%3C/script%3E'
hmmm —lack of error handling —length limitations —random encoding issues
—restrictions…
None
Option 3.
Blobs new Blob(blobParts[, options])
b = new Blob(['…'], {type: 'text/html'})
b = new Blob(['…'], {type: 'text/html'}) url = URL.createObjectURL(b) //
"blob:https%3A/…/2084018…ab3a2cec02" // later URL.revokeObjectURL(url) !
var blob = generate(source.value) URL.revokeObjectURL(target.src) iframe.src = URL.createObjectURL(blob)
hmmm! —not stored on the stack —safe, and lots of
control —sounds cool
/ 䡿 The challenges Code transpilation
ES2015 const hey = (you) => console.log(`HELLO ${you}`) !
Tracuer Babel Bublé
All pretty cool, though personally ♥Bublé
Bublé —inspired by Babel —no shims / polyfills —compact transforms
only —less extensibility —fast —Nice one, Rich Harris
buble.transform(source.value).code
/ 䡿 The challenges External modules
// commonjs const utils = require('utils') utils.say('yeah!') // ES2015 modules
import {say} from 'utils' say('yeah!')
bundling !
Webpack Browserify Rollup
All pretty cool, though… ♥Rollup
Rollup —embracing ES2015 modules —minimal code-rewriting —tree shaking —d3, THREE.js
Rollup —embracing ES2015 modules —minimal code-rewriting —tree shaking —d3, THREE.js
—Seriously, Rich Harris you're the best
rollup.rollup({ entry: '__main__', plugins:[ { resolveId: (i) => i, load:
(id) => { if(id == '__main__') return source.value return fetch('/module/' + id + '.js') } } ] }).then(bundle => bundle.generate({ format: 'iife' }).code )
/ 䡿 The challenges Not breaking things
for(var i = 99; i > 0; i++) { console.log(`${i}
bottles of beer`) }
jsbin/loop-protect Super props, Remy Sharp loopProtect(`for(var i = 99; i
> 0; i++) { console.log(\`${i} bottles of beer\`) }`)
{;loopProtect.protect({ line: 1, reset: true }); for(var i = 99;
i > 0; i++) { if (loopProtect.protect({ line: 1 })) break; console.log(`${i} bottles of beer`) } !
/
/ 䡿 Why
Closing the loop
Closing the loop change, save, tab, ftp, wait, tab, refresh
Uploading stuff to a server
Closing the loop change, save, tab, refresh Local development
Closing the loop change, save Live reload+
Closing the loop change In place editing
This is a good thing
/ 䡿 Why Multi Device Development Experiments
/1 Collaboration
None
/2 Broadcast
/2.1 (Broadcast) For development
/2.2 (Broadcast) For talk-workshops
/3 Social inspired development
/
/ demo? let's build a "musical instrument"
People & user experience are the difficult things (so let's
focus on them)
Thank you, I'm @benjaminbenben (also, right here)