Mashing up JavaScriptAdvanced techniques for modern web applications

Bastian Hofmann / VZnet Netzwerke Ltd.

Wtf?

• JavaScript Apps

• CORS and OAuth2

• Local Storage

• OEmbed and Caja

• WebSockets, ActivityStrea.ms and PubsubHubbub

• OpenSocial

You?

Questions? Ask!

http://slideshare.net/bashofmann

https://github.com/bashofmann/statusnet_js_mashup

Let‘s write a JS App

Don‘t reinvent the wheel!

Open Source

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Open Standards

DEMO

History & Bookmarking

http://sammyjs.org/

DEMO

API Access

Same Origin Policy

Cross-Origin Resource Sharing

Backendapi.twitter.com

Client client.net

AJAX

Access-Control-Allow-Origin: *

http://www.w3.org/TR/cors/

DEMO

var html="<ul>";for (var i=0; i < viewers.length; i++) {   html += "<li>" + viewers[i].displayName + "</li>";}html += "<ul>";document.getElementById("#div").innerHTML = html;

Templates

Mustache.JS

https://github.com/janl/mustache.js

}

DEMO

Authorization

+----------+ Client Identifier +----------------+ | |>---(A)-- & Redirection URI --->| | | | | | End <--+ - - - +----(B)-- User authenticates -->| Authorization | User | | | Server | | |<---(C)--- Redirect URI -------<| | | Client | with Access Token | | | in | in Fragment +----------------+ | Browser | | | +----------------+ | |>---(D)--- Redirect URI ------->| | | | without Fragment | Web Server | | | | with Client | | (F) |<---(E)--- Web Page with ------<| Resource | | Access | Script | | | Token | +----------------+ +----------+

User-Agent Profile

DEMO

Storing the access token

Cookie

Problem: Cookie is also sent to the backend

Local Storage

http://www.w3.org/TR/webstorage/

DEMO

Mash it up!

cool video:http://www.youtube.com/watch?v=OFzkTxiwziQ

OEmbed• Retrieves embeddable content for a given link

http://www.flickr.com/services/oembed/?url=http%3A//www.flickr.com/photos/bees/2341623661/

{        "version": "1.0",        "type": "photo",        "width": 240,        "height": 160,        "title": "ZB8T0193",        "url": "http://farm4.static.flickr.com/3123/2341623661_7c99f48bbf_m.jpg",        "author_name": "Bees",        "author_url": "http://www.flickr.com/photos/bees/",        "provider_name": "Flickr",        "provider_url": "http://www.flickr.com/"}

http://oembed.com/

The embedded result

cool video:

OEmbed Aggregation

•embed.ly

•supports 218 services over one endpoint

•several libraries

•easy implementation

http://embed.ly/

DEMO

Caja

http://code.google.com/p/google-caja/

DEMO

Instant updates without reloading

<link rel="alternate"href="http://status.net.xyz:8061/index.php/api/statuses/user_timeline/3.atom"type="application/atom+xml" title="Notice feed for bastian (Atom)"/>

<entry> <activity:object-type>http://activitystrea.ms/schema/1.0/note</activity:object-type> <id>http://status.net.xyz:8061/index.php/notice/20</id> <title>hello from client</title> <content type="html">hello from client</content> <link rel="alternate" type="text/html" href="http://status.net.xyz:8061/index.php/notice/20"/> <activity:verb>http://activitystrea.ms/schema/1.0/post</activity:verb> <published>2011-05-23T21:07:33+00:00</published> <updated>2011-05-23T21:07:33+00:00</updated> <link rel="ostatus:conversation" href="http://status.net.xyz:8061/index.php/conversation/20"/> <georss:point>52.52437 13.41053</georss:point> <link rel="self" type="application/atom+xml"href="http://status.net.xyz:8061/index.php/api/statuses/show/20.atom"/> <link rel="edit" type="application/atom+xml"href="http://status.net.xyz:8061/index.php/api/statuses/show/20.atom"/> <statusnet:notice_info local_id="20" source="api" favorite="false"repeated="false"></statusnet:notice_info></entry>

http://activitystrea.ms/

<link href="http://status.net.xyz:8061/index.php/main/push/hub" rel="hub"/>

PubSubHubbubretrieves Atom feed with Hub URL

Hub

posts sthpings everysubscriber

subscribes for feed

ackssubscription

http://code.google.com/p/pubsubhubbub/

http://nodejs.org/

WebSockets

http://dev.w3.org/html5/websockets/

Browser Notifications

Tying it together

retrieve Stream with Hub

Ajax: request Subscription

WebSockets:new Post

subscribe at hubchallenge

acknew post

Notification

new post

DEMO

Including widgets

GADGETapivz.net

CONTAINERmeinvz.net

DEMO

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