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ASP Classes: How do I iterate through a property that's an array?


I'm going a little crazy trying to learn how to use arrays as properties in
VBScript classes. Hopefully someone can help. First, I can't figure out
whether it's possible to iterate through the members of an array that I have
assigned to a propety. Second, I'm finding the question of "Property Let"
versus "Property Set" to be very confusing.

I have this code that utilizes a custom class I've defined, called clsGroup:

myString = "Su***@u.washington.edu, Bo*@u.washington.edu,
Bi**@u.washington.edu"

Dim objGroup
Set objGroup = New clsGroup
objGroup.EmailsAsArray = ParseCommaDelimitedStringToArray(myString)

If I test the resulting array, as follows:
Response.Write(IsArray(objGroup.EmailsAsArray))
....it resolves to "True". So objGroup.EmailsAsArray is successfully assigned
an array, which is what I want.

Confusing things:

1) If I try a simple loop, as follows...

dim myThingy
For each myThingy in objGroup.EmailsAsArray
response.write myThingy & "<br>"
Next

....this doesn't work. It complains that I'm not dealing with a collection.
This makes some sense, because I have a collection wrapped up in an object.
What's the right practice and/or syntax in this case?

2) The second thing that has me confused is whether an array is an object or
not. I'm thinking it is not. I wasted a lot of time trying to use the
"Property Set" declaration in trying to assign the array to my
..EmailsAsArray property. In the end, the only thing that would not return an
error was the more typical "Get/Let" pair:

Public Property Get EmailsAsArray()
EmailsAsArray = m_objEmailsAsArray
End Property
Public Property Let EmailsAsArray(objEmailsAsArray)
m_objEmailsAsArray = objEmailsAsArray
End Property

The amount of literature devoted to Class development in classic ASP is
unimpressive. Maybe time to move on up to ASP.NET.

Any help out there?

-KF
Jul 22 '05 #1
1 6259
ke*****@u.washington.edu wrote:
I'm going a little crazy trying to learn how to use arrays as
properties in VBScript classes. Hopefully someone can help. First, I
can't figure out whether it's possible to iterate through the members
of an array that I have assigned to a propety. Second, I'm finding
the question of "Property Let" versus "Property Set" to be very
confusing.

I have this code that utilizes a custom class I've defined, called
clsGroup:

myString = "Su***@u.washington.edu, Bo*@u.washington.edu,
Bi**@u.washington.edu"

Dim objGroup
Set objGroup = New clsGroup
objGroup.EmailsAsArray = ParseCommaDelimitedStringToArray(myString)
What is this "Parse..." thingy? Did you reinvent the builtin split() method?

If I test the resulting array, as follows:
Response.Write(IsArray(objGroup.EmailsAsArray))
...it resolves to "True". So objGroup.EmailsAsArray is successfully
assigned an array, which is what I want.

Confusing things:

1) If I try a simple loop, as follows...

dim myThingy
For each myThingy in objGroup.EmailsAsArray
response.write myThingy & "<br>"
Next

...this doesn't work. It complains that I'm not dealing with a
collection. This makes some sense, because I have a collection
wrapped up in an object. What's the right practice and/or syntax in
this case?
Hmm, according to the docs, a "for each" loop should work with an array. In
fact, this works fine:

dim ar, i
ar=array(14,2,3)
for each i in ar
response.write i & "<BR>"
next
Have you tried a simple "for i = 0 to ubound(...)" loop?


2) The second thing that has me confused is whether an array is an
object or not. I'm thinking it is not.


Correct. You never use Set with arrays in vbscript.

You can download the vbscript documentation from:
http://tinyurl.com/7rk6

Bob Barrows
PS. This isn't really an asp question: it's more of a vbscript question. The
vbscript gurus hang out at m.p.scripting.vbscript.

--
Microsoft MVP - ASP/ASP.NET
Please reply to the newsgroup. This email account is my spam trap so I
don't check it very often. If you must reply off-line, then remove the
"NO SPAM"
Jul 22 '05 #2

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