BA394 VBScript Lecture 2

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BA394 VBScript Lecture 2

• DeVaris Brown

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In this Lecture

• Quick overview on various Control Statements.
• We will learn more about Nested Loops.
• A brief introduction to Form objects.
• And finally look at a working Login page.

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Control Statements A Brief History

• Control statements are used to let your program
  decide where it wants to go next.
• Probably the most classic example of a control
  statement is the If Statement.
• Before the If statement was created however, the
  very first form of a control statement was the
  GoTo command.

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Control Statements (II)

• The format of the if statement is as follows.
• If ltexpressiongt Then
• Do Something
• Else
• Do Something else
• End If

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Nested Ifs (Ifs in Ifs)

• Nested ifs work JUST like a normal If statement,
  however you have to be MUCH more careful.
• Nested ifs are really just an If statement inside
  of an If statement. They are often hard to read
  / understand.
• Useful when you have to evaluate multiple things
  at the same time.
• See Nested If example on the web

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Case Statement (A Better If)

• Case statements were created to give the
  programmer a cleaner / quicker way to evaluate
  many conditions at the same time.
• The syntax is as follows
• Select Case ltvariablegt
• Case ltexpressiongt
• Case ltexpressiongt
• Case Else
• End Select
• See Case Statement example on the web.

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A Form Objects Primer

• Form objects are probably the most important
  method of ASP. They provide an easy way to
  transfer data from the user to the system.
• A Form object can come in many Forms one of
  which is the Command Button, another would be a
  Text Input Box.
• When a user enters in their name in a text box
  and hits submit, this is an example of ASP Form
  Objects.

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Login.asp What needs to happen

• Today, everyone will be creating a login.asp page
  for use with their projects.
• The login.asp will allow a user to enter in their
  username (Email address) and password.
• Once this information is submitted, the server
  will look in the database and tell then wither or
  not they are allowed to login (Authenticated).

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Login.asp The Code

• The main objects that you will need to complete
  this are
• Two Text boxes (Form Objects)
• A Submit Button (Form Object)
• A active database connection (ADO Connection)
• You can see an example of what I did for a simple
  login page online (NOT what you are supposed to
  do).

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Questions or Comments
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Final Notes

• Be sure that everyone in the group knows how to
  create the login page for this project.
• Also make SURE you check back on the website
  before the quiz next week as there may be changes
  noted etc..
• Finally if you have any other questions or
  problems dont hesitate to email me.
  (dpbrown_at_uiuc.edu)