Go to: Articles List
Part 1 | Part 2 | Part 3 | Part 4
The For Each...Next loops (FEN loop) are very different from the do, while, and
for next loops. The FEN loop is used to loop through collections like recordsets,
form collections, or arrays.
You can think of a collection as storage facility. The ones that allow you to
rent a place to store things you can't find a place for. Each storage facility has
certain number of units available.
Going with this example, let's assume we have an object that represents our
storage facility (objStorage). And we want to print out the name of each customer
in our facility. Here is some code that could do this:
For Each Unit in objStorage
Response.Write("Unit #" & Unit.Number & " -- Name: " & Unit.CustName & "<br>")
Next
Ok, this might have been a little hard to understand. How about an example that you
can try yourself. Here is an example of looping through the server variables (you can
cut and paste this code in to a file, save it, and run it from an asp capable server to see
the result).
For Each x in Request.ServerVariables
Response.Write(x & " = " & Request.ServerVariables(x) & "<br>")
Next
Result:
I cut and pasted a few of the server variables that I got back. There is a big list
that comes back, not just these.
HTTP_ACCEPT = image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, image/png, */*
HTTP_ACCEPT_LANGUAGE = en
HTTP_CONNECTION = Keep-Alive
HTTP_HOST = www.Brinkster.com
HTTP_USER_AGENT = Mozilla/4.04 [en] (Win95; I)
There is no signifigance in the x. We really could have called this anything that we
wanted to. I choose x because it is easy to work with and a commonly used variable name.
You can learn more about Server Variables in the
Server Variables How To.
|
|
|
|