ASP - If Statement
An If Statement is used to make
a decision in your ASP program to
execute certain code if some
condition is True. Because ASP is
programmed in VBScript by default,
when you program an ASP If
Statement it is actually the same
as programming a VBScript If
Statement.
If Statement Syntax
ASP's If Statement is slightly
different than the If Statement
implementation in most other
languages. There are no brackets,
or curly braces, nor are there any
parenthesis. Rather the beginning
of the code to be executed in the
If Statement when its true is
marked with Then and the end of
the If Statement is plainly marked
with End If. Below is a very basic
If Statement that will always be
True.
ASP Code:
<%
Dim myNum
myNum = 6
If myNum = 6 Then
Response.Write("Variable myNum
= 6")
End If
%> |
Display:
You might notice that the "="
operator is used to both set the
value of myNum to 6 at first, then
it is used to compare myNum to 6
in our If Statement. This dual use
of the equals operator is
confusing to many, but it might
help you to remember that in ASP
you cannot set the value of
variables within If Statements,
which means that the "=" can only
compare!
ASP - If Else Conditional
Statement
Sometimes you might want to
execute some code both when the If
Statement is True and some
different code when it is False.
Just like other programming
languages, you can do this in ASP
with the use of the Else keyword.
Below is an example that will
always be false, so that the Else
portion of the If Statement is
always executed.
ASP Code:
<%
Dim myNum
myNum = 23
If myNum = 6 Then
Response.Write("Variable myNum
= 6")
Else
Response.Write("**Variable
myNum = " & myNum)
End If
%> |
Display
ASP - ElseIf Conditional
Statement
With a normal If Statement you
can only check one condition, but
at times you will want to check
for multiple conditions. In ASP
you can do this with ElseIf, which
is the name given to an If
Statement that depends on another
If Statement.
Think about it in plain english:
If something is true Then do this
ElseIf second something is true
Then do this, etc. You may have
used the ElseIf condition
statement in other programming
languages, but if not just know
that you cannot have an ElseIf
statement without first having an
if statement.
Below is an example whose
second if statement (elseif) is
always true.
ASP Code:
<%
Dim myFastfood
myFastfood = "JBox"
If myFastfood = "McD's" Then
Response.Write("Happy Meal Por
Favor!")
ElseIf myFastfood = "JBox"
Then
Response.Write("Two tacos
please!")
Else
Response.Write("Foot-long
turkey sub.")
End If
%> |
Display:
| 
