VBScript IsNull Function
Definition and Usage
The IsNull function can return a Boolean value indicating whether the specified expression is invalid data. If the expression is Null, it returns True, otherwise it returns False.
Syntax
IsNull(expression)
| Parameter | Description |
|---|---|
| expression | Required. Expression. |
Example
dim x document.write(IsNull(x)) x=10 document.write(IsNull(x)) x=Empty document.write(IsNull(x)) x=Null document.write(IsNull(x))
Output separately:
False False False True
