VBScript Reference Manual for InduSoft Web Studio

InduSoft Web Studio VBScript Reference Manual
Key Notes:
2. If VBScript detects that the variant subtype is an Array, the VarType function never
returns 8192. This is a base figure, and the actual value returned is 8192 plus the value of
the array type. For instance, if you have an Array of Boolean values, the value returned
would be vbArray + vbBoolean, or 8192 + 11 = 8203.
IsXxxx() Functions
This is a series of functions that lets you determine whether a specific variable or constant is a
certain data subtype. These functions check the variable or constant against a specific data
subtype and return a Boolean value (True or False) indicating whether the variable or constant
is the specified data subtype. Examples include:
Dim MyArray(5) ‘ Declare an array
Dim MyVal ‘ Declare a variable
Date1 = “April 14, 2006” ‘ Assign Date
Date2 = #6/10/89# ‘ Assign Date
Date3 = “Hello World” ‘ Assign string
MyCheck = IsArray(MyArray) ‘ Returns a Boolean True
MyCheck = IsDate(Date1) ‘ Returns a Boolean True
MyCheck = IsDate(Date2) ‘ Returns a Boolean True
MyCheck = IsDate(Date3) ‘ Returns a Boolean False
MyCheck = IsEmpty(MyVal) ‘ Returns a Boolean True
MyVal = 5 ‘ Assign a value of 5
MyCheck = IsNumeric(MyVal) ‘ Returns a Boolean True
MyCheck = IsEmpty(MyVal) ‘ Returns a Boolean False
MyCheck = IsNull(MyVal) ‘ Returns a Boolean False
MyVal = Null ‘ Assign a null value (contains no valid data)
MyCheck = IsNull(MyVal) ‘ Returns a Boolean True
MyVal = Empty ‘ Assign Empty (uninitialized state)
MyCheck = IsEmpty(MyVal) ‘ Returns a Boolean True
Alternatively, you can use the IsXxxx() function in a conditional statement. For example,
Dim sInput
sInput = InputBox (“Enter a data value”)
If IsNumeric (sInput) Then
MsgBox “Valid Input”
Else
Msgbox “Invalid Input”
EndIf
InduSoft, Ltd. 77