ASP Select Case
In the previous lesson you learned how to setup a block of If Statements using
the ElseIf keyword, but this is not the most efficient method for checking
multiple conditions. ASP uses the Select Case statement to check for multiple Is Equal To "=" conditions of a single variable.
If you are an experienced programmer you realize the Select statement resembles a Switch statement that
other programming languages use for an efficient way to check a large
number of conditions at one time.
ASP Select Case Example
The variable that appears immediately after Select Case is what will be checked against the list of case statements. These
case statements are contained within the
Select Case block of code.
Below is an ASP Select Case example that only checks for integer values. Later
we will show how to check for strings.
ASP Code:
<%
Dim myNum
myNum = 5
Select Case myNum
Case 2
Response.Write("myNum is Two")
Case 3
Response.Write("myNum is Three")
Case 5
Response.Write("myNum is Five")
Case Else
Response.Write("myNum is " & myNum)
End Select
%>
Display:
myNum is Five
ASP Select Case - Case Else
In the last example you might have noticed something strange, there was
a case that was referred to as "Case Else". This case is actually a catch all option
for every case that does not fit into the defined cases. In english it might be thought of as:
If all these cases don't match then I'll use the "Case Else"!
It is a good programming
practice to always include the catch all Else case. Below we have an example that always
executes the Else case.
ASP Code:
<%
Dim myNum
myNum = 454
Select Case myNum
Case 2
Response.Write("myNum is Two")
Case 3
Response.Write("myNum is Three")
Case 5
Response.Write("myNum is Five")
Case Else
Response.Write("myNum is " & myNum)
End Select
%>
Display:
myNum is 454
Select Case with String Variables
So far we have only used integers in our Select Case statements, but you can also
use a string as the variable to be used in the statement. Below we Select against a string.
ASP Code:
<%
Dim myPet
myPet = "cat"
Select Case myPet
Case "dog"
Response.Write("I own a dog")
Case "cat"
Response.Write("I do not own a cat")
Case Else
Response.Write("I once had a cute goldfish")
End Select
%>
Display:
I do not own a cat
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