VBScript Conditional Statements

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

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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

 

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

If...Then...ElseIf

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Select Case

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

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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