WEB 2.0 WEB 2.0
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WEB 2.0WEB 2.0WEB 2.0WEB 2.0
What we are speaking about…
• Transformation of WEB, the WEB 2.0– New generation of websites…– Importance of Open Data…– Importance of Users… – Web as application platform…– Web 2.0 hard to define…
• Web technolologies– Client and server, HTTP, HTML, CSS– Static and Dinamic web pages
• Web 2.0 technologies– RSS, AJAX and the others…
Have you heard about them?
• Some new websites was born in the last couple of years. They are – „somehow different” – „not just plain” websites but services– giving a „Rich User Experience”– Wikipedia, Del.icio.us, Facebook, Google
services (Mail, Maps, Docs), Youtube, Flickr, and more and more others, probably you have heard about them…
Web 1.0 Web 2.0 Tendencies
• Britannica Online --> Wikipedia
• personal websites --> blogging
• publishing --> participation
• content management systems --> wikis
• directories (taxonomy) --> tagging ("folksonomy")
• mp3.com --> BitTorrent
• Screen scraping --> web services
• Stickiness --> syndication
Websites as Applications
• Rich Internet Applications – more than a book or a computer program.
• Rich User Experience• Instead a desktop PC program you can
use Internet services for your daily work (text and image editing, watching movies)
• You can access your data and programs from everywhere of the world.
• A Web 2.0 as platform
Participating
• Create not just consume• Community• Living on the web…• Social networking• User Ranking• Tagging• Blogging
Tagging example
Flickr.com
Open Data
• Open standards (w3c.org) to obey = understandable content for everybody
• Data ownership – Don’t steal my data, dont lock me in
• New copyright regulations (?)• Content independent from the way of
visualization and the place of creation• „No more secret”
© Tim O'Reilly
Web technologies – Client and server
Server
Client
Client
Client
Client
Basic Communication of WEB
Webserver
Browser (the client)
HTTPreq.
HTTPans. HTM
L
Web communication – Static Web
Browser (the client)
HTTPreq.
HTTPans. HTM
L
WebServer
File system static files
HTML, JPG, …
Browser(client)
HTTPreq.
HTTPans. HTM
L
Web serverprogram
File system: programs also
Pl. PHP
Databaseserver
SQL req.
DATA
Web communication – Dynamic Web
Technologies: RSSReally Simple Syndication (RSS 2.0)
Technologies: AJAXAsynchronous JavaScript and XML
• It’s not ONE (new) technology, but more technlolgies together:– XHTML és CSS (to visualize the standardised
content); – Document Object Model (Dinamic view and
interacivity)– XML és XSLT; (Data transfer and data
handling)– XMLHttpRequest; – JavaScript, the glue…
Ajax solves… (?)
• A Web is good to display html but can it
be used as a program? Interactivity?
• What do you do while the webserver
creating the page to your request?
Waiting?
• Do you have to see when the browser
makes a connection to the server?
Differences - Modell
Differences - Communication
Who uses AJAX?
• „Paractical” examples (not in a „laboratory”):– Google services (Gmail, Google Groups, Google
Maps, BodyBrowser, Picasa…)– Google Documents – text editor, office programs – Flickr – photos
– del.icio.us - bookmark– Youtube – media– Facebook – social– Wikipedia
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