- The Fundamentals of VBScript
- VBScript Versus VB
- Creating Variables in VBScript
- Concatenating Strings
- Arrays and Loops
- Resizing Arrays
- Inequality Operators
- Conditional Statements
- Select Case Statements
- Sub
- Function
- Working with Arguments
- Beware of Types
- Event Procedure Naming Syntax
- Server-Side Events
- Local Variables
- Script-Level Variables
Function
A Function is a procedure that returns a value upon execution. You construct it very much in the same way that you do a Sub. However, instead of using the Sub <keyword> you use the Function <keyword>. Moreover and most importantly, you pass a value out of a Function by assigning the value to the function's name. Writing well-designed functions is the first step toward creating well-encapsulated code. Listing 3.11 shows you code in which the Sub GetBiggerNumber has been transformed to a Function called GetBiggerNumber(). The function returns a value, which depends on the larger value entered into text elements on a Web page.
Listing 3.11: Returning a Value from a Function (03asp11.htm)
<HTML>
<HEAD>
<TITLE></TITLE>
</HEAD>
<SCRIPT LANGUAGE=VBScript>
Function GetBiggerNumber()
Dim x
Dim y
'Get the First Number
x = CInt(text1.value)
'Get the Second Number
y = CInt(text2.value)
'Pass the larger number out of the
'function by assigning the value to
'the function's name.
If x > y Then
GetBiggerNumber = x
Else
GetBiggerNumber = y
End If
End Function
Sub button1_OnClick()
'Use the return of the function, GetBiggerNumber
'as the value to assign to the text element,
'text3.
text3.value = GetBiggerNumber()
End Sub
</SCRIPT>
<BODY>
<P>First Number: <INPUT name=text1 size=15></P>
<P>Second Number:
<INPUT name=text2 size=15></P>
<INPUT type="button" value="Get Bigger Number" name=button1>
<P>Bigger Number: <INPUT name=text3 size=15></P>
</BODY>
</HTML>
Listing 3.11 changes the internals of the page. However, the output of that listing is much the same as what is shown in Figure 3.8.
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