I've gotten a lot of useful information from everyone here, but I'm
just short of going insane with the problem I am experiencing.
I have 2 aspx pages. On page 1 (Trip.aspx) there are 2 links
buttons, one for new Trip, one for Existing Trip.
If the user clicks New, I append "new" to the querystring and move
to page 2 (TripNewEdit.aspx)
If the user clicks Existing, I display a table with existing trip
information from which the user selects a trip. I then
append "edit" to the querystring and move to page 2
(TripNewEdit.aspx) which I populate the appropriate textboxes.
Now, aside from the usual textbox entered data, each trip can
have "n" trip legs (ie.-from Baltimore to DC, DC to San Fran...).
The trip legs are in a server table which is displayed on
TripNewEdit.aspx. If its a new trip, I dynamically
create 2 legs (row) in the table...if its an existing trip, I
display the number of current legs. Within the trip leg table is a
link button to "Add" additional leg rows to the table.
This calls the LegAddLink_Click event, which adds a new row
appending the row number to the control name creating a unique ID.
The problem I am experiencing is that whenever I generate additional
legs to the table, I have to regenerate all (existing & new) of the
leg rows each time the page loads.
Is there a way around this? I'm having a hard time determining what
I need to use Viewstate on, and/or if I can just apply it to the
table as a whole. It just seems like a lot of work to keep objects
persisted. Then again, I'm sure I'm wrong.
Here is my pseudo code:
Sub Page_Init()
If Querystring = "new" Then
LoadNewTripTable()
Elseif Querystring = "edit" then
LoadExistingTable()
End If
End Sub
Sub Page_Load()
'Nothing
End Sub
Sub LoadNewTable()
'build initial 2 leg rows
for row = 1 to 2
BuildLegTable(row)
Next
ViewState("mode") = "new"
End Sub
Sub LoadExistingTable()
'Populate existing text boxes
'build leg rows based on legs
for each row in triplegs
BuildLegTable(row)
Next
ViewState("mode") = "edit"
End Sub
Function BuildLegTable(row)
Dim tRow as NEw TableRow
For cellCtr = 1 to 8 'there are 8 cells per row
Dim tCell as New TableCell
Select Case cellCtr
...
newControl.id = "Name" & rowCtr
tCell.Controls.Add(newControl)
End Select
tRow.Cells.Add(tCell)
Next
Table.Rows.Add(tRow)
End Function
Sub LegAddLink_Click()
Dim passThruCnt As Boolean ' used to check to see if on a
new record this is the first time thru so that we know to start with
row #3
If Page.IsPostBack Then
If Viewstate("mode") = "new" And ViewState("passThruCnt") =
False Then
rowBegin = 3 'first time around, begin & end with
row #3
rowEnd = 3
Elseif Viewstate("mode") = "new" And ViewState
("passThruCnt") = True Then
rowBegin = 3 'have to begin with row #3 again in
order to properly regenerate the new rows.
rowEnd = ViewState("rowCnt") ' contains the total
number of rows after new row was added (see below)
Elseif Viewstate("mode") = "edit" And ViewState
("passThruCnt") = False Then
'rowBegin = 'haven't gotten this far yet
'rowEnd = '
End if
for row = rowBegin to rowEnd
BuildLegTable(rowCtr)
next
Viewstate("rowCnt") = Leg.Rows.Count 'gets new count of
table rows
Viewstate("passThruCnt") = True
End Sub
'*********
Any and all help is greatly appreciated. Thanks!
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