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VBScript Server Side Code to read checkbox.ID

Posted on 2009-05-14
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Last Modified: 2012-06-27
I generate a dynamic set of checkboxes in Classsic ASP

<input type="checkbox" name="cbx1" id="cbx1" value = "abc" >
<input type="checkbox" name="cbx2" id="cbx2" value = "def" >
<input type="checkbox" name="cbx3" id="cbx3" value = "ghi" >

When the ASP Page is posted, I need to loop thru the checkboxes and read their ids in VBScript on the server.

For R = 1 to n
   set myCbx = request.form("cbx" & r)
   myID = myCbx.ID
Next

However the system doesn't like the myID = myCbx.ID line.  Is there any way to read the ID of a checkbox if it is not checked?

Thanks for your help
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Question by:deepPowdah
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Bobaran98 earned 1500 total points
ID: 24391806
If the checkbox is not checked, then it does not get sent.  You can see this in the address line if you configure your form to be submitted with GET.  Assuming the first and third checkboxes are clicked, and your form action is set to submission.asp, you'll see this in your browser's address bar:

http://www.mydomain.com/submission.asp?cbx1=abc&cbx3=ghi

Note that cbx2 doesn't get passed at all.  Because it wasn't checked, it does not have a value as far as the submission is concerned.  The same goes if you submit your form via POST.

If you want to always send those three values, rather than making it dependent on the user checking/unchecking them, you could embed them as hidden values.  The user doesn't see the variables, but they still get submitted no matter what.  Example:

<input type="hidden" name="cbx1" id="cbx1" value = "abc" >
<input type="hidden" name="cbx2" id="cbx2" value = "def" >
<input type="hidden" name="cbx3" id="cbx3" value = "ghi" >
As for your loop, I'm not sure why you're processing it that way.  For one thing, you keep overwriting your variable.  For another thing, Request.Form("cbx" & r) is equal to the value tag and "cbx" & r is equal to the ID.  What more do you need to process?

Coming back to your question about knowing which checkboxes were NOT checked, you can certainly have your code determine that if you know what the values were to start with.  Try this... in your first page, the one with the checkboxes, add a hidden field called "cbxNum" and set the value to the number of checkboxes you've put on the page:

<input type="hidden" name="cbxNum" id="cbxNum" value = "3" >

Now when you process the submission, you can do this:

Dim cbxNum as integer
Dim myCbx as string
cbxNum = CInt(Request.Form("cbxNum")

For r = 1 to cbxNum
myCbx = Request.Form("cbx" & r)
If IsNull(myCbx) Or myCbx="" Then
Response.Write("cbx" & r & " was not submitted<br>\n")
Else
Response.Write("cbx" & r & " = " & myCbx & "<br>\n")
End If
Next
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Author Closing Comment

by:deepPowdah
ID: 31581608
From what I have been able to determine, an unchecked checkbox does not have an ID or value property.  Only checked checkboxes have these properties.  The solution to my problem, as you suggested, was to create a hidden field in which I can put the vaue I need to keep.  I implementend that and it's sweet.  Thanks for your help.
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