ASP Procedures

In ASP you can call a JavaScript procedure from a VBScript and vice versa.

Procedures

The ASP source code can contain procedures and functions:

Example

<!DOCTYPE html>
<html>
<head>
<%
sub vbproc(num1,num2)
response.write(num1*num2)
end sub
%>
</head>
<body>

<p>Result: <%call vbproc(3,4)%></p>

</body>
</html>

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Insert the <%@ language="language" %> line above the <html> tag to write the procedure/function in another scripting language:

Example

<%@ language="javascript" %>
<!DOCTYPE html>
<html>
<head>
<%
function jsproc(num1,num2)
{
Response.Write(num1*num2)
}
%>
</head>
<body>

<p>Result: <%jsproc(3,4)%></p>

</body>
</html>

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Differences Between VBScript and JavaScript

When calling a VBScript or a JavaScript procedure from an ASP file written in VBScript, you can use the "call" keyword followed by the procedure name. If a procedure requires parameters, the parameter list must be enclosed in parentheses when using the "call" keyword. If you omit the "call" keyword, the parameter list must not be enclosed in parentheses. If the procedure has no parameters, the parentheses are optional.

When calling a JavaScript or a VBScript procedure from an ASP file written in JavaScript, always use parentheses after the procedure name.

VBScript Procedures

VBScript has two kinds procedures:

Sub procedure
Function procedure

VBScript Sub Procedures

A Sub procedure:

is a series of statements, enclosed by the Sub and End Sub statements
can perform actions, but does not return a value
can take arguments

Sub mysub()
some statements
End Sub

Sub mysub(argument1,argument2)
some statements
End Sub

Example

Sub mysub()
response.write("I was written by a sub procedure")
End Sub

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VBScript Function Procedures

A Function procedure:

is a series of statements, enclosed by the Function and End Function statements
can perform actions and can return a value
can take arguments that are passed to it by a calling procedure
without arguments, must include an empty set of parentheses ()
returns a value by assigning a value to its name

Function myfunction()
some statements
myfunction= some value
End Function

Function myfunction(argument1,argument2)
some statements
myfunction= some value
End Function

Example

function myfunction()
myfunction=Date()
end function

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Calling a Procedure

This simple function procedures is called to calculate the sum of two arguments:

Example

Function myfunction(a,b)
myfunction=a+b
End Function

response.write(myfunction(5,9))

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The function "myfunction" will return the sum of argument "a" and argument "b". In this case 14.

When you call a procedure you can use the Call statement, like this:

Call MyProc(argument)

Or, you can omit the Call statement, like this:

MyProc argument

More Examples

Call procedures using VBScript
How to call both a JavaScript procedure and a VBScript procedure in an ASP file.

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