Online Chatting Room

1
Online Chatting Room

• Ji Xu Yuhong Chen

2
Objective

• Build an Online Chatting Room which allows
  multiple users to logon and communicate at the
  same time.

3
Features

• User need a unique user name to logon the
  chatting room.
• When a user logon to the chatting room, the
  information of the IP address as well as exact
  time when user enters will be collected.
• Once logon to the chatting room, the user can
  type the message (no more than 200 characters) in
  a text area, and then clicks the submit Button to
  upload the message to the chat lobby window.
• User can set font, color, and size of the input
  text. Images and special symbols are allowed to
  post.

4
Features

• The chat lobby window will display the messages
  from all users currently in chatting. Page will
  refresh every 5 seconds so new posts can be
  displayed and some old messages may get purged.
• If a user has not input anything for 20 minutes,
  the session will expire and the user has to
  re-logon to continue the chat.
• A user can log off /log on at any time.
• The latest 100 messages will be saved in a text
  file, and others will be deleted automatically.

5
Technologies

• Active Server Pages (ASP),VBScript
• Jscript Javascript, HTML

6
Active Server Pages (ASP)

• ASP is a technology (not a language) for building
  dynamic and interactive web pages.
• ASP takes the scripting language code and
  converts it into HTML on the server, before
  sending it back to the browser.
• ASP is executed on the web server, so any client
  (browser) can be used to view the results.
• ASP decreases the demand on browsers, by getting
  the server to do some of the work instead.

7
ASP vs. HTML

• ASP
• Read the request from the browser
• Find the page in the server
• Perform any instructions provided in ASP to
  modify the page
• Send the page back across the Internet to the
  browser

• HTML
• Reads the request from the browser
• Finds the page in the server
• Sends the page back across the Internet to the
  browser

8
Advantages of ASP

• Make it easier to edit contents of a web page, by
  updating a text file or the contents of a
  database rather than the HTML code itself.
• Create pages that will be customized to display
  only things that will be of interest to a
  particular user.
• Display and update databases contained in the web
  page, and manipulate the data therein, by being
  able to sort the entries into any order or view a
  subset of them.

9
Online Chatting Room

• http//www26.brinkster.com/xuchen/default.asp