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Introduction to Web Based Application

Introduction to Web Based Application. Web-based application. TCP/IP (HTTP) protocol Using WWW technology & software Distributed environment. World Wide Web. Allows users from anywhere on the internet to retrieve documents from any other computers

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Introduction to Web Based Application

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  1. Introduction to Web Based Application

  2. Web-based application • TCP/IP (HTTP) protocol • Using WWW technology & software • Distributed environment

  3. World Wide Web • Allows users from anywhere on the internet to retrieve documents from any other computers • The main protocol is the HTTP – HyperText Transfer Protocol • HTTP provides a standard form of communication between web browsers and web servers.

  4. World Wide Web (cont.) • Web browsers • Programs running on client computers • Request for documents using URL • eg. IE, Mozilla, Chrome • Web servers • Programs that provide documents to browsers • eg. Apache, Dot.Net

  5. World Wide Web (cont.) • URL – Uniform Resource Locator • A reference of a document on the web. • eg. http://webs.cs.utm.my/index.html • http://webs.cs.utm.my/images/logo.jpg

  6. Web Architechture How the Web works for static contents (basic architecture) CGI scripts

  7. Advantages • Easy for deployment • Standard interface (HTML) for many platform (Windows, Linux/Unix, Mac) • Distributed task

  8. Disadvantages • Compare to standalone apps • Security prob – malicious code etc., sensitive data – CC • Restricted for client • Limited GUI and Interaction

  9. Example tech./framework • Conventional CGI – Perl, C, C++, Python, VB • Java Servlet • Enterprise JavaBeans • Server pages – ASP, PHP, JSP • Client side script – VB Script, JavaScript

  10. Common Gateway Interface How the Web works for dynamic contents CGI Intepreter CGI scripts

  11. HTML vs. Javascript vs. CGI • HTML • is the main language for delivering document over the web. • is the only language that web browsers can understand. • Javascript • Documents that are created by HTML are static. HTML doesn’t support logical features. • Javascript is used to make the document dynamic. • Eg. before we can perform any delete operation, the browser should ask the user first for confirmation. This cannot be done by the HTML. Javascript can. • CGI • Javascript is executed at client computers – ie. in web browsers. It is called client-side scripting language. • Databases or other resources are located at the server computer. We need another programs to access them – ie. CGI programs. • CGI languages such as PHP, JSP, Perl, etc are called server-side scripting languages, because they are executed at the server.

  12. HTML, CSS, & Javascript PHP SQL

  13. Example Web-Based Apps • E-Commerce • Amazon, Ebay, osCommerce • Online Forum • phpBB, vBulletin • Online Blog/Social • Blogspot, Facebook • CMS • Joomla, Mambo, Lenya • Online Album – google picasa, photobucket • Video Streaming • Youtube, Quicktime movie trailer

  14. Summary • We will learn in this class how to: • present our content for web viewing in its most simple way through (HTML code) • systematically managing the formatting and arrangement of content in HTML through CSS • managing event,interaction and manipulating web content (html doc) through Javascript

  15. Summary (cont.) • We will learn in this class how to: • management of user and application data through CGI and server-pages scripting (server code encoded in html doc) • Server-pages technology – PHP

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