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webseiten für mobile geräte
PATRICK H. LAUKE / OPERA SOFTWARE




Patrick H. Lauke / MobileTech Conference 2010 / Mainz / 8 September 2010
mobile web ist
immer wichtiger
wir brauchen eine site
     für's iPhone
...für's iPhone...
oh, und für's iPad
“remove iPhone from ass”
  Peter-Paul Koch, The iPhone obsession
        www.quirksmode.org/blog/archives/2010/02/the_iphone_obse.html
sites die auf (fast) allen
mobilen devices laufen
1. nichts tun
nicht mehr nur WAP oder text
moderne mobile browser
     kommen mit
“normalen” sites zurecht
“aber der mobile kontext...”
2. separate mobile site
  (m.flickr.com, mobile.mysite.com, ...)
vorsicht: browser sniffing
      photo: http://www.flickr.com/photos/timdorr/2096272747/
lasst den user entscheiden:
   desktop oder mobile?
“refactored” für kleine displays,
  nicht verwässert für handys
3. einzige adaptive site
nichts neues...
fluid layout, progressive enhancement, graceful degradation
CSS 2 Media Types
   (screen, print, handheld)
CSS 2.1 Media Types
<link rel="stylesheet" ...
media="print" href="...">

@import url("...") print;

@media print {
  // insert CSS rules here
}
CSS 3 Media Queries
  “...the new hotness” Jeffrey Zeldman
    http://www.zeldman.com/2010/04/08/best-aea-yet/
CSS 3 Media Queries
● erweitern CSS 2.1 Media Types konzept
● präzisere kontrolle (nicht nur screen, print...)

● width, height, orientation, color, resolution, …



http://www.w3.org/TR/css3-mediaqueries/
CSS 3 Media Queries
<link rel="stylesheet" ...
media="screen and (max-width:480px)" href="...">

@import url("...") screen and (max-width:480px);

@media screen and (max-width:480px) {
  // insert CSS rules here
}
viewport meta
viewport meta
●
  desktop: viewport = sichtbares browserfenster
●
  mobile geräte: “virtual viewport”, physical pixels, zoom
●
  viewport meta schlägt dem browser interpretierung vor
viewport meta
<meta name="viewport"
content="width=device-width">

<meta name="viewport"
content="width=320, initial-
scale=2.3,user-scalable=no">
http://developer.apple.com/safari/library/documentation/AppleApplications/Reference/SafariWebContent/UsingtheViewport/UsingtheViewport.html
performance optimieren
daten und server requests
minimieren / vermeiden
 (minify JavaScript, kombinierte CSS files, …)
CSS sprites
 Dave Shea, A List Apart
 www.alistapart.com/articles/sprites
width: 50px; height: 50px;
background: url(icons.gif) no-repeat -51px 0;
data URLs
http://software.hixie.ch/utilities/cgi/data/data
data URLs
<img width="48" height="48" alt="Redux gravatar"
src="data:image/jpeg,%FF%D8%FF%E0%00%10JFIF
%00%01%01%01%00H%00H%00%00%FF% … ">

h1 {
     background: url("data:image/jpeg,%FF%D8%FF
%E0%00%10JFIF%00%01 … ") no-repeat left top;
}
HTML5
<!DOCTYPE html>
video, audio und canvas
   ohne “steck-eins”
(kein Java / Flash / Silverlight auf mobilen geräten)
isgeolocationpartofhtml5.com
geolocation
navigator.geolocation.getCurrentPosition(success, error);
navigator.geolocation.watchCurrentPosition(success, error);

function success(position) {
   /* where's Wally? */
   var lat = position.coords.latitude;
   var long = position.coords.longitude;
   ...
}
offline detection
window.addEventListener('online', function(){ … }, true);
window.addEventListener('offline', function(){ … }, true);
application cache
<html manifest=”blah.manifest”>

CACHE MANIFEST
images/sprites.png
scripts/common.js
scripts/jquery.js
styles/global.css
data.xml

NETWORK:
resources/news.xml

FALLBACK:
images/ offline/not-available.png
…und mehr (in arbeit)
WebGL, <device>, Contacts API …
1. nichts tun
2. separate mobile site
3. einzige adaptive site
www.opera.com/developer
                        patrick.lauke@opera.com
people.opera.com/patrickl/presentations/mobiletechcon_08.09.2010/mobiletechcon_08.09.2010.pdf

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Webseiten für mobile Geräte - MobileTech Conference 2010 Mainz