Conditional statements are used to perform different actions for different decisions.
In VBScript we have four conditional statements:
Use the If...Then...Else statement if you want to
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
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:
If i < 10 Then
response.write("Have a nice day!")
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).
You can use the If...Then...ElseIf statement if you want to select one of many blocks of code to execute:
If i = 10 Then
ElseIf i = 11 Then
ElseIf i = 12 Then
ElseIf i = 16 Then
response.write("Time to go home!")
You can also use the "Select Case" statement if you want to select one of many blocks of code to execute:
Select Case d
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.