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Things I've learnt from my Hacker News web app
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Lim Chee Aun
January 22, 2013
Technology
1
120
Things I've learnt from my Hacker News web app
A talk I gave at the Front-end Developers User Group meet up in Hackerspace SG.
Lim Chee Aun
January 22, 2013
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Transcript
Things I've learnt from my Things I've learnt from my
Hacker News web app Hacker News web app
Hello, I'm Chee Aun. • Hardcore web developer. • Created
quite a bunch of fun little side projects. • Tweet a lot of interesting stuff at @cheeaun • Occasionally read Hacker News.
What is Hacker News?
news.ycombinator.com news.ycombinator.com
I built HackerWeb.
HackerWeb • A simple read-only web app client for Hacker
News. • Mobile-optimized, iOS-optimized. • Works on all modern browsers, hopefully. • Check it out at hackerwebapp.com
None
None
None
Cutting-edge web tech -webkit-overflow-scrolling: touch, localStorage, sessionStorage, CORS, Application Cache,
CSS Animation, CSS Media Queries, Flexible Box Layout (old spec), requestAnimationFrame, Web Workers, and more…
Must-reads • How I built the Hacker News mobile web
app • How I built the Hacker News mobile web app, Part 2 • Introducing HackerWeb
Focus on 3 things 1. -webkit-overflow-scrolling: touch (Momentum scrolling) 2.
CORS (Cross-Origin Resource Sharing) 3. Application Cache
1 Momentum scrolling
-webkit-overflow-scrolling: touch • iOS-specific, for now. No official spec. •
Introduced since iOS5 (October 2011). • For overflow:scroll elements.
Before iOS5 • Two fingers to scroll overflow:scroll elements. •
Unintuitive and undiscoverable. • Scrolling libs to the rescue: iScroll, Scrollability, TouchScroll, FTScroller, etc
Starting from iOS5 • One finger to scroll overflow:scroll elements.
• -webkit-overflow-scrolling: touch adds momentum to it. • Scrolling libs are still in used due to bugs/quirks. • Bug: Can't scroll to top when tapping status bar
Demo time • Normal scrolling: jsbin.com/uhiyac/1 • Momentum scrolling: jsbin.com/uhiyac/2
Resources • Overthrow – overflow:auto polyfill • jQuery Mobile: touchOverflow
• Nested divs with overflow:touch
2 CORS
Before CORS • Use JSONP. • Request data from a
server in a different domain. • Example: json-head.appspot.com/? url=http://www.google.com/&callback=test • A “hack”.
CORS • A W3C Working Draft. • Allow JavaScript to
make cross-domain requests. • An interplay between the server and the client. Access-Control-Allow-Origin: *
Use CORS today!
Who implements CORS? • Google APIs • Amazon S3 •
YouTube API • Dropbox API • GitHub v3 API • …and more
Resources • Enable CORS • CORS isn’t just for XHR
• Can I use CORS? • Using CORS - HTML5 Rocks • CORS Proxy
3 Application Cache
AppCache • Easily make your web site/app offline. • A
working draft. • A douchebag.
Super simple steps Step 1. <html manifest="manifest.appcache"> Step 2. CACHE
MANIFEST index.html stylesheet.css …
Versioning CACHE MANIFEST # 2013-01-21:v1 index.html stylesheet.css …
Google Reader
Reeddit – Reddit web app client
Track AppCache versions Use Google Analytics' event tracking
Make local dev easier • Serve 404 for .appcache files
• For HackerWeb, I use node server.js -noappcache
Resources • A Beginner's Guide to Using the Application Cache
• Fixing Application Cache Community Group • Appcache Facts
More resources • Moobile – new mobile application framework built
on MooTools • Ratchet – Prototype iPhone apps with simple HTML, CSS and JS components • HTML5 Rocks • Can I use…
Thanks • cheeaun.com • twitter.com/cheeaun • github.com/cheeaun Images used in
this presentation • flickr.com/photos/diathesis/2262012694/