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
160
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
240
Simpler Things
benfoxall
0
1.7k
Using Browsers to Visualise Data
benfoxall
0
79
Serving Data From Browsers
benfoxall
0
62
Building multi-device interfaces with the web
benfoxall
1
170
Other Decks in Technology
See All in Technology
25分で解説する「最小権限の原則」を実現するための AWS「ポリシー」大全 / 20250625-aws-summit-aws-policy
opelab
9
1.1k
mrubyと micro-ROSが繋ぐロボットの世界
kishima
2
260
Кто отправит outbox? Валентин Удальцов, автор канала Пых
lamodatech
0
340
250627 関西Ruby会議08 前夜祭 RejectKaigi「DJ on Ruby Ver.0.1」
msykd
PRO
2
270
Snowflake Summit 2025 データエンジニアリング関連新機能紹介 / Snowflake Summit 2025 What's New about Data Engineering
tiltmax3
0
310
Amazon Bedrockで実現する 新たな学習体験
kzkmaeda
2
540
Observability в PHP без боли. Олег Мифле, тимлид Altenar
lamodatech
0
340
Amazon ECS & AWS Fargate 運用アーキテクチャ2025 / Amazon ECS and AWS Fargate Ops Architecture 2025
iselegant
16
5.5k
AIエージェント最前線! Amazon Bedrock、Amazon Q、そしてMCPを使いこなそう
minorun365
PRO
14
5.1k
PHP開発者のためのSOLID原則再入門 #phpcon / PHP Conference Japan 2025
shogogg
4
730
低レイヤを知りたいPHPerのためのCコンパイラ作成入門 完全版 / Building a C Compiler for PHPers Who Want to Dive into Low-Level Programming - Expanded
tomzoh
4
3.2k
AWS アーキテクチャ作図入門/aws-architecture-diagram-101
ma2shita
29
11k
Featured
See All Featured
Balancing Empowerment & Direction
lara
1
370
Designing Dashboards & Data Visualisations in Web Apps
destraynor
231
53k
Building a Scalable Design System with Sketch
lauravandoore
462
33k
Documentation Writing (for coders)
carmenintech
72
4.9k
How STYLIGHT went responsive
nonsquared
100
5.6k
The Web Performance Landscape in 2024 [PerfNow 2024]
tammyeverts
8
670
RailsConf & Balkan Ruby 2019: The Past, Present, and Future of Rails at GitHub
eileencodes
138
34k
GraphQLとの向き合い方2022年版
quramy
48
14k
Being A Developer After 40
akosma
90
590k
VelocityConf: Rendering Performance Case Studies
addyosmani
330
24k
[RailsConf 2023 Opening Keynote] The Magic of Rails
eileencodes
29
9.5k
Large-scale JavaScript Application Architecture
addyosmani
512
110k
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)