InfoPath Dev

I have a form based on an Access database. The database has a main table (called tblRequests) to which users can submit data. The main table has a one to many with a second table (repeating table called lkpComments). On my form I show one record from the main table, and many records (comments) from the second table). Users can add comments at will, but I want to prevent a user from deleting a comment that belongs to someone else. Therefore, my comments table includes a field titled "CommentBy" which holds the name of the person who originally entered it.
I want to be able to compare the current UserName with the name in the CommentBy field of the repeating table entry that currently has focus so that I can prevent it's deletion.
This is what I have so far, but there is something wrong with my reference to the @CommentBy field. (I think it is because I need to somehow refer to the specific "comment" entry that has the focus).
Any ideas? Thanks!

function msoxd_d_lkpComments::OnBeforeChange(DataDOMEvent)
{

//determine the current user
var oNetwork = new ActiveXObject("WScript.Network");
var strUserName = oNetwork.UserName;

//check to see if the current user is the owner of the comment
if (strUserName == XDocument.DOM.selectSingleNode("/dfs:myFields/dfs:dataFields/d:tblRequests/lkpComments/@CommentBy").text)
{
//allow deletion of the record
}
else
//prevent deletion of the record
if (DataDOMEvent.Operation == "Delete" && DataDOMEvent.Site == DataDOMEvent.Source && DataDOMEvent.NewValue == null)
{

DataDOMEvent.ReturnStatus = false;
DataDOMEvent.ReturnMessage = "You cannot delete this record";
}
}

Hi smaur,
My guess is you are having OnBeforeChange on "lkpComments" node
Here instead of using full xpath you just need to use "@CommentBy" xpath on DataDOMEvent.Source node
XDocument.DOM.selectSingleNode(DataDOMEvent.Source, "@CommentBy").text

Agni
InfoPath Dev India

Thanks for your reply Agni,
If I understand correctly, I should replace the full path statement I am currently using:
XDocument.DOM.selectSingleNode("/dfs:myFields/dfs:dataFields/d:tblRequests/lkpComments/@CommentBy").text)
with:
XDocument.DOM.selectSingleNode(DataDOMEvent.Source, "@CommentBy").text
...but when I do this I get an error stating...
Wrong number of arguments or invalid property assignment
File:script.js
Line:208

where line 208 is the line witht the path.

I appreciate your help.

I am sorry smaur, i made a mistake in my code, here is the actual code that will work for
DataDOMEvent.Source.selectSingleNode("@CommentBy").text




Agni
InfoPath Dev India

Agni,
Thanks for your help.
I corrected the code as you suggested,

The problem now is that my test for
strUserName == DataDOMEvent.Source.selectSingleNode("@CommentBy").text
always results in True.
That is if the current UserName appears even once in the @CommentBy field in the repeating table, then he can delete any repeating table entry. My intent was to allow a user to delete only the comments which he has entered.
The only time a user is prevented from deleting a comment is when he has not made a single comment.

Perhaps I don't fully understand the capabilities/limits of the repeating table control. If the user has selected a particular line in the repeating table, is there a way to extract a piece of data in a field on the line that currently has the focus and then do a comparison with that single data point?

Thanks to Agni, this now works,

function msoxd_d_lkpComments::OnBeforeChange(eventObj)
{
var oNetwork = new ActiveXObject("WScript.Network");
var strUserName = oNetwork.UserName;

if (eventObj.Operation == "Delete" && eventObj.Site == eventObj.Source && eventObj.NewValue == null && strUserName != eventObj.Source.selectSingleNode("@CommentBy").text)
{
eventObj.ReturnStatus = false;
eventObj.ReturnMessage = "You cannot remove a comment entered by someone else";
}

else
{
//allow deletion
}
}