radiobuttonlist get selected item

[Guest]

Hello,
I have an aspx file where i've put a placeholder element. On load
(page_load) i create dynamically an html 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 (submit_pressed) is run. My
problem is that i can not get the selected items in the radiobuttonlists.This
is caused cos in the page_load event i call the sub that dynamically
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 that line of code, the radiobuttons keep their
values or not,after each submit, without a pattern (at least not one that i
can see)!). 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

here is a portion of the code
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

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

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(0) is a radiobuttonlist
rdbDisplayed = tc.controls(0)

'****************************
'the following line always returns item(0) cos the sub
addControlsInPlaceholder has already run (it's called in the page_load event)
before the submit_pressed is called
displayed = rdbDisplayed.selecteditem.value
'*****************************

if chk.checked = true then
'show displayed
end if

next

end sub

 

[Guest]

Remove the bind from your Page_Load and put into its own routine. Only call
from Page_Load if it is not a Postback. If you need to rebind, do it from
your button click after you retrieve values. Ordering of events is fixed, so
you have to be flexible.

--
Gregory A. Beamer
MVP; MCP: +I, SE, SD, DBA

***************************
Think Outside the Box!
***************************

 

[S. Justin Gengo]

juststarter,

I have some example code on using dynamic controls on my website:
http://www.aboutfortunate.com?page=codelibrary if you go to the given page
and use the search box there to search for "dynamic" you'll get all the
examples in the search results. There are only about 3 or 4 and I think that
it would benefit you to take a look at them.

--
Sincerely,

S. Justin Gengo, MCP
Web Developer / Programmer

www.aboutfortunate.com

"Out of chaos comes order."
Nietzsche

 

[Guest]

Thx both for your help,
what i did is the following :
in page_load event i added:

if not page.ispostback then
call addControlsInPlaceholder()
end if

in the submit_pressed sub i added the following line in the end of the sub
(so that i recreate the html table after i save the values of the
radiobuttonlist :
call addControlsInPlaceholder()

the problem is that the line (in the submit_pressed sub) :
otable = ctype((plh1.controls(0)),table)
is returning an error because plh1 doesn't have any controls any more.

Doesn't the placeholder retain the controls added to it, after the postback
is done, or am i missing something?

theodore

 

[S. Justin Gengo]

juststarter,

No you have to recreate any controls added dynamically to a page upon each
page load.

--
Sincerely,

S. Justin Gengo, MCP
Web Developer / Programmer

www.aboutfortunate.com

"Out of chaos comes order."
Nietzsche