web 2.0: the new internet thing ankit jain head wmg, dcetech.com 4 th year, comp engg

Web 2.0:The New Internet Thing

Ankit JainHead WMG, DCETECH.COM

4th Year, Comp Engg

TECHWEEK 2007

Internet - WWW

Inter-network and World Wide Web Provides services like email, chat, info

sharing, social networking, games, remote access, virtual classrooms etc

Interlinked hypertext documents accessed using HTTP Protocol

Client - Server architecture

TECHWEEK 2007

Why Internet?Use of internet

Email Social Networking, Chat Information sharing Getting updates – News around the world Entertainment – Games, Videos and Music Virtual classrooms Remote Access Online Jobs

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How do Websites work?

What happens when you type the following in the Web Browser:

http://www.dcetech.com/index.htm

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How do Websites work? Lets Break it!!

http://www.dcetech.com/index.htmHTTP:HyperText Transfer Protocol Determines how to send and receive request

using browser Default port 80 Send and receive Hypertext data

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COM, BIZ, EDU, GOV, NET, etc

Top Level Domain (TLD) Determines where to find the location of Server Name Servers locations are stored in Registry Verisign Global Registry Services for .com

and .net; Public Interest Registry for .org; EDUCAUSE for .edu

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Second Level Domains Have to be registered at some Domain Registrar Registrars are managed by ICANN (Internet

Corporation for Assigning Names and Numbers) Every name in a TLD must be unique, but there

can be duplication across different TLDs

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http://www.dcetech.com/index.htmWWWThird Level Domain These are the third level domains like

mail.dcetech.com, alumni.dcetech.com, etc This is not necessarily required, these are

managed by different DNS There can be upto 127 levels of domain but are

generally restricted to 3 or 4 levels

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How do Websites work? http://www.dcetech.com/index.htmINDEX.HTM This denotes a file name “index.htm” existing at

the web server It has nothing to do with DNS, this part is solely

managed by the web server If the file doesn’t exist the appropriate action is

taken by the web server If it exist then it is returned to the client who

requested it

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Why Websites?Offline Apps vs. Online Apps

ONLINE APPS No need to install Just login and use Available from anywhere where Internet

connection is available Operating system independent No piracy issues

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Why Websites?Offline Apps vs. Online Apps

OFFLINE APPS Ease of use Generally have more features Easier to develop but difficult to update

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Web Technologies

Web standards are maintained by World Wide Web Consortium (W3C)

Web Technologies are responsible for the Web Applications you see today

Key to develop web applications Include all scripting languages and tools

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List of Web Technologies

Client Side Technologies HTML, CSS, JavaScript, VBScript XHTML, DHTML, WML, AJAX FLASH

Server Side Technologies ASP, PHP, Perl, JSP ASP.NET MySQL, SQL Server, Access

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List of Web Technologies

Some More Advanced Technologies XML, XSLT, RSS, Atom X-Path, XQuery, WSDL XML-DOM, RDF Ruby on Rails, GRAIL Framework REST, SOAP

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How to choose a technology?

Depends on: What is the type of content? Application of technology Who will modify your content? What are your Future Plans? Compatibility and Availability of technology Your previous experience Portability and Data sharing

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WEB 2.0

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Defining Web 2.0 Web 2.0 is the network as platform delivering software as a continually-updated

service that gets better the more people use it consuming and remixing data from multiple

sources, including individual users, while providing their own data and services in a form that allows remixing by others

creating network effects through an "architecture of participation," and going beyond the page metaphor of Web 1.0 to deliver rich user experiences.

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Web 2.0: Evolution Towards a Read/Write Platform

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Web 2.0 is about The Social Web

“Web 2.0 Is Much More About A Change In People and Society Than Technology”

1 billion people connect to the Internet 100 million web sites over a third of adults in US have

contributed content to the public Internet. - 18% of adults over 65

-Dion Hinchcliffe, tech blogger

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AJAX Asynchronous Javascript and XML XMLHTTPRequest Backbone of Web 2.0 Mixture of Client Side and Server side scripting Key player in developing rich internet

applications (RIAs) Enhances user experience – Dynamic user

interfaces Reduces page reloads

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How to… AJAX?function GetXmlHttpObject(){

var objXMLHttp=nullif (window.XMLHttpRequest){

objXMLHttp=new XMLHttpRequest()}else if (window.ActiveXObject){

objXMLHttp=new ActiveXObject("Microsoft.XMLHTTP")}return objXMLHttp

}

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How to… AJAX?var xmlHttp;function GetAJAX(){

xmlHttp=GetXmlHttpObject()var url=“try.php";xmlHttp.onreadystatechange=stateAJAXxmlHttp.open("GET",url,true);xmlHttp.send(null);

}

//works on state change of above functionfunction stateAJAX(){

if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete"){alert(xmlHttp.responseText);}

}

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Web Services

Publish Data Not Pages

Remember: its your data that they want, not your user interface

RSS feeds are web services, too

“Mashups”

Remix Data to Create New Applications

184 Web services listed on ProgrammableWeb.com

Photo sharing; calendars; messaging; blogging File storage; ecommerce; advertising; search

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Some common Web2.0 Examples

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Del.icio.us – Content tagging siteTags: Descriptive words applied by users to links. Tags are searchable

My Tags: Words I’ve used to describe links in a way that makes sense to me

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Wikipedia – Collaborative dictionary

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Blogger – Collection of users data (Blogs)

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PXN8 – Online Photo Editor

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Social networking

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Google maps

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Flickr – social network for photo sharing

Flickr shows me photos from my network

My contacts “tags” are available to me

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Some working with Flickr

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Yahoo Maps

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Summing up

Web 2.0 hard to define, but very far from just hype

Culmination of a number of web trends

Importance of Open Data

Allows communities to assemble unique tailored applications

Importance of Users

Seek and create network effects

Browser as Application Platform

Huge potential for new kinds of web applications

TECHWEEK 2007

XAMPP: http://www.apachefriends.org

FOR TUTORIALS: http://www.w3schools.com

CONTACT ME: [email protected]

web 2.0: the new internet thing ankit jain head wmg, dcetech.com 4 th year, comp engg

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