VBScript Select Case
The last two lessons you have read through have covered the basics of using the
If Statement and the somewhat more advanced ElseIf Statement in VBScript. This lesson
will take it a step further by teaching you how to implement the Select Case statement in VBScript.
VBScript Select Case: Why Use It?
When you need to check for many different cases on one variable you could create a large number of ElseIf statements, but this is
actually very inefficient. Without getting to specific, it takes VBScript a great deal of computing power to check all these
different ElseIf statements. Also, this kind of coding reduces human readability. Because of these problems another programming method, the Select Case statement, was created
to solve this problem.
The downside to this new method is you can only check if a variable is equal to something "=" and not compare
it with greater than, less than, etc (>, <, >=, <=).
VBScript Select Case: Creation
A VBScript Select Case statement can be summed up into three main parts.
- Variable - The variable contains the value which we are trying to determine. Our example
will be a variable containing the name of a person.
- Case Statements - The case statements contain the values we are checking for. Our example will
contain a few names, each their own case statement.
- Case Code Blocks - Each case statement has a block of code associated with it. When its
case statement is True then the block of code is executed. Our example will print out
a greeting depending on the person's name.
Below is a simple example of a Select Case statement that will write
something different to the web browser depending on the name stored in the variable
myName.
VBScript Code:
<script type="text/vbscript">
Dim myName
myName = "Charles"
Select Case myName
Case "Bob"
document.write("Been busy Bob?")
Case "Sara"
document.write("Seen any slick sunglasses Sara?")
Case "Charles"
document.write("Did you chuck your chowder Charles?")
End Select
</script>
Display:
Did you chuck your chowder Charles?
VBScript Select Case: Else Case
Just like an If Statement has an optional Else clause, a Select
Statement has an optional Else case. When the variable cannot
match any of the cases included then the Else case will be used.
VBScript Code:
<script type="text/vbscript">
Dim myName
myName = "supercalifragilisticexpialidocious"
Select Case myName
Case "Bob"
document.write("Been busy Bob?")
Case "Sara"
document.write("Seen any slick sunglasses Sara?")
Case "Charles"
document.write("Did you chuck your chowder Charles?")
Case Else
document.write("Who are you?")
End Select
</script>
Display:
Who are you?
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