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ASP VB Procedures

In ASP you can call a JavaScript procedure from a VBScript and vice versa. VBScript has two kinds procedures

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>

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>

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

  • 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

    or

    Sub mysub(argument1,argument2)
      some statements
    End Sub

    Example

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

    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

    or

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

    Example

    function myfunction()
      myfunction=Date()
    end function

    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))

    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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