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ASP VB Conditionals

Conditional statements are used to perform different actions for different decisions

Conditional Statements

Conditional statements are used to perform different actions for different decisions.

In VBScript we have four conditional statements:

  • If statement - executes a set of code when a condition is true
  • If...Then...Else statement - select one of two sets of lines to execute
  • If...Then...ElseIf statement - select one of many sets of lines to execute
  • Select Case statement - select one of many sets of lines to execute

    • If...Then...Else

    Use the If...Then...Else statement if you want to

  • execute some code if a condition is true
  • select one of two blocks of code to execute

    • If you want to execute only one statement when a condition is true, you can write the code on one line:

    If i=10 Then response.write("Hello")

    There is no ..Else.. in this syntax. You just tell the code to perform one action if a condition is true (in this case If i=10).

    If you want to execute more than one statement when a condition is true, you must put each statement on separate lines, and end the statement with the keyword "End If":

    If i=10 Then
    response.write("Hello")
    i = i+1
    End If

    There is no ..Else.. in the example above either. You just tell the code to perform multiple actions if the condition is true.

    If you want to execute a statement if a condition is true and execute another statement if the condition is not true, you must add the "Else" keyword:

    Example

    i=hour(time)
    If i < 10 Then
    response.write("Good morning!")
    Else
    response.write("Have a nice day!")
    End If

    In the example above, the first block of code will be executed if the condition is true, and the other block will be executed otherwise (if i is greater than 10).

    If...Then...ElseIf

    You can use the If...Then...ElseIf statement if you want to select one of many blocks of code to execute:

    Example

    i=hour(time)
    If i = 10 Then
    response.write("Just started...!")
    ElseIf i = 11 Then
    response.write("Hungry!")
    ElseIf i = 12 Then
    response.write("Ah, lunch-time!")
    ElseIf i = 16 Then
    response.write("Time to go home!")
    Else
    response.write("Unknown")
    End If

    Select Case

    You can also use the "Select Case" statement if you want to select one of many blocks of code to execute:

    Example

    d=weekday(date)
    Select Case d
      Case 1
        response.write("Sleepy Sunday")
      Case 2
        response.write("Monday again!")
      Case 3
        response.write("Just Tuesday!")
      Case 4
        response.write("Wednesday!")
      Case 5
        response.write("Thursday...")
      Case 6
        response.write("Finally Friday!")
      Case else
        response.write("Super Saturday!!!!")
    End Select

    This is how it works: First we have a single expression (most often a variable), that is evaluated once. The value of the expression is then compared with the values for each Case in the structure. If there is a match, the block of code associated with that Case is executed.

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