Forms Data Controls :: How To Reference Dynamically Generated Checkboxes Inside Listview

Mar 17, 2011

I'm trying to check dynamically generated "checkbox" value inside Listview.

I can reference non-dynamic checkboxes exact in same location (index) inside Listview using "e.Item.FindControl", however I can't reference dynamic checkboxes.

Here is my code.


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I'm trying to create checkboxes inside Listview from code behind, but I'm having problem creating them.

What am I missing here?

Checkbox's ID comes from Datareader.

Here is my code.

If reader2.HasRows Then
While reader2.Read
Dim jobid As String = Convert.ToString(reader2("JobTicketID"))
Dim jobtitle As String = Convert.ToString(reader2("JobNickName"))
Dim item As ListViewDataItem
For Each item In ListView1.Items
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Dim jobtr As HtmlTableRow = CType(item.FindControl("jobtr"), HtmlTableRow)
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cb2.ID = jobid + "cb2"
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End While
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I know this not the right place to ask javascript related questions.

But I dont understand how else to get the answer.

I have built an application using 4.0 and entity framework. I have implemented the routing feature introduced with the .Net 4.0 version.

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Dec 29, 2010

Im developing a database driven 4.0 application and are currently stuck with the following issue.

I need to dynamically add checkboxes using code behind. These checkboxes represent activities that the user may chose from by ticking the ones that they are interested in. I do not know the number or which activities that should be presented until runtime so hard coding checkboxes is not an option.

On the client side I need to keep track of which checkboxes/activities the user have chosen as I need to calculate the cost for these without doing a postback. I would like to use javascript to find out what activities that are chosen and also calculate the total cost using javascript.

To implement this I tried to use Page.ClientScript.RegisterExpandoAttribute (server side) and javascript (client side, but I do not manage as ticking any of the checkboxes will not fire a client side event. Im also using Telerik RadPanelBar controler.

Below is my current not working implementation:

Code behind/aspx.cs

public override void DoLayout(Aranea.Common.EntityDOL.ProjectRegistration existingRegistration)
lblCaption.Text = "Payment page";
//Get collection
TrackableCollection<ProjectActivityBooking> acitivities = existingRegistration.ProjectParticipant.ProjectEntity.ProjectActivityBooking;
//Add datasource and bind
this.RadPanelBar1.ItemDataBound += new RadPanelBarEventHandler(itemDatabound);
this.RadPanelBar1.DataSource = acitivities;
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void itemDatabound(Object sender, RadPanelBarEventArgs e)
decimal totalActivityPrice = 0;
//Get panelItem
RadPanelItem item = (RadPanelItem)e.Item;
//Create Checkbox
CheckBox chk = new CheckBox();
chk.ID = "box";
//create label
Label lbl = new Label();
//Get Activity
ProjectActivityBooking activity = item.DataItem as ProjectActivityBooking;
//trying to register my checkboxes
Page.ClientScript.RegisterExpandoAttribute(this.validator.ClientID, "ClientID", chk.ClientID);
//Get total activity price
totalActivityPrice = GetActivityPrice(activity);
//Get total booked
totalBooked += totalActivityPrice;
lbl.Text = totalActivityPrice.ToString();
//Set activity name
chk.Text = activity.ProjectActivity.ActivityName;
chk.TextAlign = TextAlign.Left;
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Client side code:

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="PaymentPage.ascx.cs" Inherits="CX.Aranea.Client.WebFront.UserControls.RegistrationForm.Payment.PaymentPage" %>
<%@ Register assembly="Telerik.Web.UI" namespace="Telerik.Web.UI" tagprefix="telerik" %>
<%@ Register Src="~/UserControls/CxStandardControls/CxLabel.ascx" TagPrefix="cx" TagName="Label" %>
<telerik:RadPanelBar runat="server" ID="RadPanelBar1" Width="400px" Height="30px"
Skin="Forest" ExpandMode="MultipleExpandedItems" ExpandAnimation-Type="InElastic" >
<telerik:RadPanelItem Text="root" Expanded="false">
<cx:Label ID="lblCaption" runat="server" />
<asp:PlaceHolder ID="plhChildren" runat="server"/>
<asp:Label ID="lblTotalBooked" runat="server"/>
//My custum validator
<asp:CustomValidator ID="validator" runat="server" ClientValidationFunction="validation"></asp:CustomValidator>
<script type="text/javascript" language="javascript">
function validation(source, arguments) {
var chkBox = document.getElementById(source.ClientID);
if (chkBox.checked == true) {
alert("This should work");

Ive been stuck with this for some time now and have a nice deadline coming up :) I would be most thankfull if anyone could point me in the correct direction as I feel a bit clueless. Perhaps there is a much easier way of solving this? Perhaps my code is all wrong?

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<asp:Repeater ID="RepeaterAccordionPane2" runat="server">
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<asp:UpdatePanel ID="UpdatePanel2" runat="server" UpdateMode=Conditional>
HTML Stuff

Here is the Page_Load Part

protected void Page_Load(object sender, EventArgs e)
if (!IsPostBack)
dvAlleArtikel = new System.Data.DataView(...Database...);
[... some other code here ...]
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int nUpdatePanelIndex = 0;
foreach (Control crInRepeater in RepeaterAccordionPane2.Controls)
if (crInRepeater.GetType() == typeof(RepeaterItem))
foreach (Control crInRepeaterItem in crInRepeater.Controls)............

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Here is my code of dynamic radio button list generation in rowdatabound event.


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