B118 Web Programming

1
B118 Web Programming

• Session 9 Client/Server Cookies
• April 5, 2004

2
Tonights Agenda

• Administrative
• DHTML
• Order Form Validation Homework Assignment
• Client/Server Cookies
• Intro to ASP .NET

3
Administrative

• Technical Topic
• Term project update
• Microsoft Visual Studio .NET Roadshow
• Job search tip effective networking
• http//www.eweek.com/article2/0,3959,652978,00.asp
  (eWeek Labs Break Out of Your Shell, 10/28/02
  issue)
• Upcoming quizzes
• 11/12 chapters 9, 10, 11
• 11/19 chapters 12, 13, 14
• No quiz tonight ?

4
Administrative Technical Topic

• Comments on the requirements
• One page summary (HTML format) for web posting
• Must include bibliography of your research
  sources
• Reference to a recent, relevant news article
  (industry trade article, NY Times, Wall Street
  Journal not SJ Mercury)
• Business focus why should your employer care/be
  concerned about this?

5
Administrative Term Project

• Database structure
• Microsoft Access
• Single table for each company (Ill provide the
  design/template to you)
• Core modules all are ASP.NET which Ill provide
• Catalog (by product)
• Catalog (by store)
• Catalog (by keyword)
• Shopping cart review
• ASP.NET module you need to write feedback form

6
DHTML

• Utilizes the objects, methods and properties of
  the web page (known as the document)
• Lets to you alter the web page when its being
  served up and respond to events
• Example code
• color-survey-array.htm
• National Parks slide show
• bEssentials order form

7
Order Form Validation Homework Assignment

• Due on 4/19 diskette printout
• Enhancements
• Data validation
• Shipping sales tax calculation
• Optional text alignment and read-only field
  protection
• Details on course website (see course calendar)

8
Order Form Data Validation
9
Client/Server Cookies

• Needed to maintain state
• Keeping track of information across web pages
• JavaScript cant share variable values across web
  pages or after the browser stops
• Somewhat controversial because of privacy issue
  concerns
• Used to serve as the basis for the shopping cart
  mechanism for the bEssentials project

10
Cookies - Overview

• Small file stored on users hard drive (location
  depends on the browser)
• Any web page can create a cookie
• Can be read only by another web page from the
  same Internet domain (or by the local user)
• Maximum of characters 2-4K
• Other limits on total of characters per domain
  total of cookies

11
Cookies Technical Details

• Access through the document object, cookie
  property (or document.cookie)
• A string value containing five parts
• Cookie name value
• Cookies expiration date
• Pathname of web page that created the cookie
• Domain name of the server that created the cookie
• Optional security parameter
• Browser usually fills in the last three items

12
Cookies Sample JavaScript Code

• Key code
• document.cookie string value string
  value
• document.cookie.split(field_deliminator)cookie
  _part
• make-cookie.htm and read-cookie.htm

13
Intro to ASP .NET

• JavaScript cant hide the source code from the
  user
• ASP (Active Server Pages) and ASP .NET generates
  HTML code on the server using VBScript or
  JavaScript/JScript. All the user sees is the
  final HTML product
• first.aspx, first(js).aspx, ForCounter.aspx
• All on http//cypress.cob.sjsu.edu/b118w/wong_rona
  ld