Returning early from a function in classic ASP

asp-classic

Is there a way to return early from a function in classic ASP rather than it run the full length of the function? For example lets say I have the function…

Function MyFunc(str)
  if (str = "ReturnNow!") then
    Response.Write("What up!")       
  else
    Response.Write("Made it to the end")     
  end if
End Function

Can I write it like so…

Function MyFunc(str)
  if (str = "ReturnNow!") then
    Response.Write("What up!")       
    return
  end if

  Response.Write("Made it to the end")     
End Function

Note the return statement which of course I can't do in classic ASP. Is there a way to break code execution where that return statement sits?

Best Answer

Yes using exit function.

Function MyFunc(str)
  if str = "ReturnNow!" then
    Response.Write("What up!")       
    Exit Function
  end if

  Response.Write("Made it to the end")     
End Function

I commonly use this when returning a value from a function.

Function usefulFunc(str)
   ''# Validate Input
   If str = "" Then
      usefulFunc = ""
      Exit Function
   End If 

   ''# Real function 
   ''# ...
End Function

Related Solutions

Is try-catch like error handling possible in ASP Classic

There are two approaches, you can code in JScript or VBScript which do have the construct or you can fudge it in your code.

Using JScript you'd use the following type of construct:

<script language="jscript" runat="server">
try  {
    tryStatements
}
catch(exception) {
    catchStatements
}
finally {
    finallyStatements
}
</script>

In your ASP code you fudge it by using on error resume next at the point you'd have a try and checking err.Number at the point of a catch like:

<%
' Turn off error Handling
On Error Resume Next


'Code here that you want to catch errors from

' Error Handler
If Err.Number <> 0 Then
   ' Error Occurred - Trap it
   On Error Goto 0 ' Turn error handling back on for errors in your handling block
   ' Code to cope with the error here
End If
On Error Goto 0 ' Reset error handling.

%>

Asp – Classic ASP Exception Logging (500 and 500.100 errors)

Two questions - two answers:

you should be able to raise an error with the following err.raise nr, source, description
The error handling you are using (modifying the error pages) seems to be a common way for classic asp apps.

Best Answer

Related Solutions

Is try-catch like error handling possible in ASP Classic

Asp – Classic ASP Exception Logging (500 and 500.100 errors)

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