IsNull Function

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The IsNull function returns a Boolean value that indicates whether a specified expression contains no valid data (Null). IsNull returns True if expression is Null; that is, it contains no valid data; otherwise, IsNull returns False. If expression consists of more than one variable, Null in any constituent variable causes True to be returned for the entire expression. IsNull is also not the same as a zero-length string (""), which is sometimes referred to as a null string.

The Syntax of IsNull function is :-

IsNull(expression)

Example#1 :-

Code :-
dim x
document.write(IsNull(x) & "<br />")
x=10
document.write(IsNull(x) & "<br />")
x=Empty
document.write(IsNull(x) & "<br />")
x=Null
document.write(IsNull(x))
Output :-
False
False
False
True

Example#2 :-

Code :-
<% nothere = null %>
<% =IsNull(nothere) %>
Output :-
True


Example#3 :-

Code :-
<% =IsNull("This is a string.") %>
Output :-

False

Note :- The Is Null function determines if the expression is Null.

Example#4 :-

Code :-
<% nothere = null %>
<% =IsNull(nothere) %>
Output :-
True

Example#5 :-

Code :-
<% =IsNull("This is a string.") %>
Output :-
False

 

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