VBScript Conditional Statements
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VBScript Conditional Statements
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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
Show Example »
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).
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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
Show Example »
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
Show Example »
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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