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ASP Procedures

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




<%
sub vbproc(num1,num2)
response.write(num1*num2)
end sub
%>



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




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

Example

<%@ language="javascript" %>



<%
function jsproc(num1,num2)
{
Response.Write(num1*num2)
}
%>



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




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

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


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

 

 
ASP Procedures
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