radiobuttonlist get selected value

[juststarter]

Hello,
I have an aspx file where i've put a placeholder element. On load i create
dynamically a table which contains a checkbox and a radiobuttonlist in each
tablerow . The radiobuttonlist contains two items (yes,no). Both the
checkboxes and the radiobuttonlist are NOT autopostbacked ( .autopostback =
false). When i press the submit button a sub is run. My problem is that i can
not get the selected items in the radiobuttonlists.This is caused cos in the
page_load i call the sub that dinamically recreates the table described above
and so all values are reset (there is a rdb.item(0).selected=true line in my
code. If i try to remove it, the radiobuttons keep their values or not,after
each submit, without a pattern!). I've also tried to keep the values in a
collection, instasiated in the page_load but i couldn't do so cos the table
(that contains the checkboxes and radiobuttonlists) is not recognized at the
beggining of the page_load (i guess it's not an object yet cos the sub that
creates all that is at the end of page_load)....
Anyway...any ideas on how to get the selected item ? ? ? ?
thx a lot
theodore

 

[Bob Barrows [MVP]]

Hello,
I have an aspx file where i've put a placeholder element.

There was no way for you to know it, but this is a classic asp newsgroup.
While you may be lucky enough to find a dotnet-knowledgeable person here who
can answer your question, you can eliminate the luck factor by posting your
question to a group where those dotnet-knowledgeable people hang out. I
suggest microsoft.public.dotnet.framework.aspnet.

On load i
create dynamically a table

Is this an html table or a datagrid?

which contains a checkbox and a
radiobuttonlist in each tablerow . The radiobuttonlist contains two
items (yes,no). Both the checkboxes and the radiobuttonlist are NOT
autopostbacked ( .autopostback = false). When i press the submit
button a sub is run. My problem is that i can not get the selected
items in the radiobuttonlists.This is caused cos in the page_load i
call the sub that dinamically recreates the table described above and
so all values are reset (there is a rdb.item(0).selected=true line in
my code. If i try to remove it, the radiobuttons keep their values or
not,after each submit, without a pattern!). I've also tried to keep
the values in a collection, instasiated in the page_load but i
couldn't do so cos the table (that contains the checkboxes and
radiobuttonlists) is not recognized at the beggining of the page_load
(i guess it's not an object yet cos the sub that creates all that is
at the end of page_load)....
Anyway...any ideas on how to get the selected item ? ? ? ?
thx a lot
theodore

I think the answer is that you need to create these checkboxes in either the
page_init event, or in the ItemCreated event if you are creating a datagrid
instead of an html table. But you should ask in the aspnet group to be sure.

Bob Barrows
PS. It never hurts to show a little code ...

 

[juststarter]

Bob, thx for your time
I'll take your advice and post the message to the correspondent newsgroup (i
didn't understand this was for not.net.asp ;-) )

I tried to use the page_init event but it seems not to run at all (i'm sure
i'm doing something wrong.....)
Nevertheless,i send u a piece of my code...just in case.
The table i am creating is an html one.

In html code
--------------------
<asplaceholder id="plh1" runat="server"> </asplaceholder>

in vb code
--------------------
1. create the (html) table through code

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs)
Dim ID as integer = Request("ID")
call addControlsInPlaceholder()
End Sub


sub addControlsInPlaceholder
'create the table
dim oTable as new table
oTable.id="oTable"
oTable.GridLines=GridLines.None


'first add the titles of each column
dim lb1 as new label
dim lb2 as new label

dim cell1 as new TableHeaderCell
dim cell2 as new TableHeaderCell

cell1.width=unit.pixel(180)
cell2.width=unit.pixel(120)

dim row1 as new tablerow

lb1.text= Category"
lb2.text= "isDisplayed"

'add labels to cells
Cell1.controls.add(lb1)
Cell2.controls.add(lb2)

'add (header) cells to row
Row1.cells.add(Cell1)
Row1.cells.add(Cell2)
'add header row to table
otable.rows.add(Row1)

'fill the chkboxlist/radiobuttonlist(s) with items
Dim id As String
Dim subcListItem,subcListItem1,subcListItem2 As ListItem

Dim myConnection As New OdbcConnection(Application("strConnect"))
dim strSQL as string

strSQL = " SELECT ctg_id, ctg_name FROM categories ORDER BY ctg_id"
Dim myCommand As New OdbcCommand(strSQL, myConnection)
myConnection.Open()
Dim myReader As OdbcDataReader = myCommand.ExecuteReader()

while myReader.Read()
'create new Row for the table
dim oRow as new tableRow
'create 2 cells for the row
dim oCell1 as new tableCell
dim oCell2 as new tableCell


oCell1.width=unit.pixel(180)
oCell2.width=unit.pixel(120)

'create checkbox and add it cell1 (the first cell of each row)
dim chkboxlist as new checkbox
chkboxlist.id = "categories_" & myReader.Item("ctg_id").ToString
chkboxlist.text=myReader.Item("ctg_name").ToString


oCell1.controls.add(chkboxlist)

'create radiobuttonlist and add it cell2 (the second cell of each row)
dim rdbDisplayed as new radiobuttonlist
rdbDisplayed.RepeatDirection=repeatdirection.Horizontal
rdbDisplayed.id="cs_isDisplayed_" & myReader.Item("ctg_id").ToString

'add items in radiobuttonlists
subcListItem1 = New ListItem
subcListItem1.Text = "yes"
subcListItem1.Value = "1"
rdbDisplayed.Items.Add(subcListItem1)

subcListItem2 = New ListItem
subcListItem2.Text = "no"
subcListItem2.Value = "0"
rdbDisplayed.Items.Add(subcListItem2)
rdbDisplayed.items(0).selected=true

oCell2.controls.add(rdbDisplayed)


'add cells to row
oRow.cells.add(oCell1)
oRow.cells.add(oCell2)

'add row to table
otable.rows.add(oRow)
'increase counter i, to create new row
i = i +1

end while
'add table to placeholder
plh1.controls.add(oTable)

myCommand.dispose
myConnection.close

end sub


3. when the submit button is pressed ,i try something like

private sub submit_pressed

dim otable as new table
dim tr as new tablerow
dim tc as new tablecell
dim chk as checkbox
dim i,displayed as int16
dim rdbDisplayed,rdbAdult as radiobuttonlist

otable = ctype((plh1.controls(0)),table) 'plh1 is the placeholder in the
html code

for i = 1 to otable.rows.count-1

tr = otable.controls(i)
tc = tr.controls(0)
'tc.control(0) is a checkbox
chk = tc.controls(0)

'table cell
tc = tr.controls(1)
'tc.ctontrol(1) is a radiobuttonlist
rdbDisplayed = tc.controls(0)
'********************************
'the following always returns item(0) cos addControlsInPlaceholder has
already run before submit_pressed is engaged
displayed = rdbDisplayed.selecteditem.value
'********************************
if chk.checked = true then
'show displayed
end if

next

end sub

 

[Jevon]

How are you trying to use Page_Init? To clarify what Bob said, it is here
you should be calling addControlsInPlaceholder, and not in Page_Load.

This page: http://www.15seconds.com/issue/020102.htm and the pages linked to
on this page: http://weblogs.asp.net/eporter/archive/2003/07/15/10109.aspx
might aid your understanding.

Jevon