problem with oncheckedchanged when dynamically created checkboxes

Posted on 2006-11-16
Last Modified: 2012-05-05
Hi,i have an editor.aspx where i have a table named sbaTable. That table is dynamically filled with rows in my code page editor.aspx.vb...On every row I have one checkbox and one textbox.. what i want to do is to disable textbox whenever checkbox on same row is checked=true!

editor.aspx.vb i have a loop that counts as many rows as i need(works fine)..
Private Sub PopulateGrid()
...create tablerow
...create tablecell "tcOk"
Dim chkOK as new checkbox = "ok-" + tdindex.text
chkOK.autopostback = true
''chkOK.oncheckedchanged" doesnot exist here for some reason(OnCheckedChanged exists in designer mode)!? that is why i tried with handlern below...
addhandler chkOK.checkedchanged, adressof chk_OncheckedChanged --

...create tablecell "tcNote"
Dim txtNote as new textbox = "note-" + tdindex.text
...addrows and cells to the table mm..
End Sub

Public sub chk_OncheckedChanged(ByVal sender As Object,ByVal e As EventArgs)

Dim checkBox as checkbox = Ctype(sender, CheckBox)
Dim idString as string =
End Sub

Problem = chk_OnCheckedChanged is never hit...can i do this the way i am trying oris there another solution??

Thanks in advance
Question by:adismesevic
  • 5
  • 4
LVL 10

Expert Comment

ID: 17963144
I think the handler is correct.  However, make sure the table is not re-generated on postback. You may try to generate the table in Page_PreRender to ensure that the viewstate preserves the controls that you add.


Author Comment

ID: 17963917
Hi Thanks for your answer.. i tried to create
 Private Sub Page_PreRender(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.PreRender
         'If Not Page.IsPostBack Then
         'End If
End Sub

it doesnot help table is regenereted anyway and i can't use 'If Not Page.IsPostBack Then either because then i dont get anything back when page the same time i must set autopostback = true for my checkbox or nothing will happen when clicked!!

Author Comment

ID: 17971245
anyone know anything about this??..i have searched the google but cant find any solution there either!?
Free Tool: IP Lookup

Get more info about an IP address or domain name, such as organization, abuse contacts and geolocation.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

LVL 10

Expert Comment

ID: 17975613
hmmm....did u try to enable viewstate?

Author Comment

ID: 17977631
yes, i tried that too now..still not there an easier way to do this with javascript?
LVL 10

Expert Comment

ID: 17980237
hmm....I'll try a sample today and keep you posted on how it works - give me until the evening
LVL 10

Expert Comment

ID: 17983217
ok - got it - it was PreInit not PreRender as I initially said. See a quick and dirty implementation - hopefully u get the idea.

<%@ Page Language="VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">

<script runat="server">
    Protected Sub Page_PreInit(ByVal sender As Object, ByVal e As System.EventArgs)
    End Sub
    Protected Sub PopulateGrid()
        Dim tb As New Table
        Dim tr As New TableRow
        Dim tc As TableCell = Nothing
        tc = New TableCell
        Dim chkok As New CheckBox
        chkok.AutoPostBack = True
        AddHandler chkok.CheckedChanged, AddressOf chk_oncheckchanged
    End Sub
    Protected Sub chk_oncheckchanged(ByVal sender As Object, ByVal e As System.EventArgs)
        Dim chkok As CheckBox = CType(sender, CheckBox)
        Response.Write("Checked: " & chkok.Checked.ToString())
    End Sub


<html xmlns="" >
<head runat="server">
    <title>Untitled Page</title>
    <form id="form1" runat="server">

Author Comment

ID: 18009468
Hi, first of all thank you very much for your answers I leaned some stuff that i didnot know, but unfortunately it didnt help me...when i tried your last suggestion i got some other stuff that i couldnot avoid mm
Anyway i solved it with is solution if anyone else woould need it....

chkOk.Attributes.Add("onclick", "chkChecked(document.forms[0].note_" + tdIndex.Text + ")")

 <script type="text/javascript" language="JavaScript">
   // functions to disable/enable dynamically created checkboxes/textboxes in tblSba
                function chkChecked(obj)
                     obj.disabled = !(obj.disabled);
                function txtChanged(chkobj, noteobj)
                        if (noteobj.value == '') {
                         chkobj.disabled = false;
                         else if (noteobj.value != ''){
                         chkobj.disabled = true;                        
LVL 10

Expert Comment

ID: 18014578
awesome.. glad u got it working!


Accepted Solution

DarthMod earned 0 total points
ID: 18076596
PAQd, 250 points refunded.

CS Moderator

Featured Post

Networking for the Cloud Era

Join Microsoft and Riverbed for a discussion and demonstration of enhancements to SteelConnect:
-One-click orchestration and cloud connectivity in Azure environments
-Tight integration of SD-WAN and WAN optimization capabilities
-Scalability and resiliency equal to a data center

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

1.0 - Introduction Converting Visual Basic 6.0 (VB6) to Visual Basic 2008+ (VB.NET). If ever there was a subject full of murkiness and bad decisions, it is this one!   The first problem seems to be that people considering this task of converting…
Microsoft Reports are based on a report definition, which is an XML file that describes data and layout for the report, with a different extension. You can create a client-side report definition language (*.rdlc) file with Visual Studio, and build g…
Established in 1997, Technology Architects has become one of the most reputable technology solutions companies in the country. TA have been providing businesses with cost effective state-of-the-art solutions and unparalleled service that is designed…
I've attached the XLSM Excel spreadsheet I used in the video and also text files containing the macros used below.…

820 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question