VBScript Reference Manual for InduSoft Web Studio

VBScript Reference Manual InduSoft Web Studio
Procedure Statements
There are two types of procedure statements; the Sub procedure and the Function procedure. Both of
these procedure statements are intended to encapsulate a set of statements that provide functionality
that can be repeatedly called, but the difference between the two is how arguments are passed and
results returned.
The Sub procedure is a series of VBScript statements (enclosed by Sub and End Sub statements) that
perform actions but don't return a value as part of the Sub name. A Sub procedure can take arguments
(constants, variables, or expressions that are passed by a calling procedure). A resultant value or set of
values can be returned through the arguments. If a Sub procedure has no arguments, its Sub
statement must include an empty set of parentheses ().
The Function procedure is a series of VBScript statements enclosed by the Function and End
Function statements. A Function procedure is similar to a Sub procedure, but can also return a value
in the Function name. A Function procedure can take arguments (constants, variables, or expressions
that are passed to it by a calling procedure). If a Function procedure has no arguments, its Function
statement must include an empty set of parentheses. A Function returns a value by assigning a value
to its name in one or more statements of the procedure. The return type of a Function is always a
Variant.
Procedure Statements
Function Description
Call Transfers control to a Sub or Function procedure
End Function Immediately exits a Function procedure
End Sub Immediately exits a Sub procedure
Exit Function Exit a Function, generally as a result of a condition
Exit Sub Exit a Subroutine, generally as a result of a condition
Function Declares the name, arguments, and code that form the body of a Function procedure
GetRef Associates an event handler with a specific function
Sub Declares the name, arguments, and code that form the body of a Sub procedure
(Subroutine).
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