Forms Data Controls :: Get All Checkboxes From A Datalist?
Feb 21, 2011
In a datalist i've got a checkbox with a autopostback.
But there is an error if i run it:
System.InvalidCastException: Unable to cast object of type 'System.Web.UI.LiteralControl' to type 'System.Web.UI.WebControls.CheckBox'.
There are 40 checkboxes, if the person selects 1 i need to deselect all others. Very easy, but how to use correct coding for it?
protected void chkWerkblad_OnCheckedChanged(object source, EventArgs e)
{
CheckBox s = source as CheckBox;
if (s.Checked)
{
foreach (CheckBox c in s.NamingContainer.Controls)
{
if(c !=null)
c.Checked = true;
}
}
}
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Description:An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.
Source Error: [Code]....
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<asp:GridView ID="GridView1" runat="server" DataSourceID="ObjectDataSource1"
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Feb 16, 2011
I am trying to implement a gridview with some checkboxes to allow users to select the rows that they would like to insert into a file selected from a dropdown list. am working on being able to select the rows from the grid but not having much success. I can get it to recognise each selected row but when I place them in a dataset it only stores the last checked gridrow. It's probably something simple that I'm missing y code is
protected
void Insert_ButtonClick(object
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[code]...
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Mar 11, 2011
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Aug 4, 2010
I have a usercontrol include file that has a panel on which I have programatically added checkboxes that equate to the results of a selection via a sql select stmt.
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Nov 3, 2010
I have a listview with paging.Every paging has 10 rows with with a username, an email and a checkbox.
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Feb 10, 2010
How do you go about making sure your check boxes are selected when you page throug the pages?
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[Code]....
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Feb 4, 2011
I've got a typed dataset that populates programmatically based upon dropdown selections from the user, and then is bound to a datagrid. One of the cols is a bit type (indicating whether or not that record is "active"). I would like that datagrid col to be exposed to the user as a bunch of checkboxes, which the user could turn on and off as needed, and then update the entire recordset according upon clicking Submit.
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Feb 14, 2010
[Code]....
I use if(! Page.postback) to fill those two repeaters I want to get the data related to checked checkboxes when using the below code it get only the data of the first checked box how to make it brign all the data
private void Btn_Confirm_Click(object sender, System.EventArgs e)
{
//CheckBox checkedButton = null;
foreach (RepeaterItem item in ParentRepeater.Items)
{
CheckBox control=(CheckBox)item.FindControl("CheckBox1");
if (control.Checked)
{
//checkedButton = control;
foreach(DataRow r in GetInnerData(control.Text).Rows ) // GetInnerData is used to pring datarelated to the selected check box
{
if(r["DESCRIPTION"].ToString() == control.Text)
{
Response.Write(r["DESCRIPTION"].ToString() + r["Date" ].ToString() + r[ "Trx" ].ToString() + r[ "GL" ].ToString() + r["Amount" ].ToString() +"
");
}
}
control.Dispose();
//checkedButton.Dispose();
break;
}
}
}
}
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Dec 29, 2010
I´m developing a database driven asp.net 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. I´m 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)
{
base.DoLayout(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;
this.RadPanelBar1.DataBind();
this.lblTotalBooked.Text = "Total Booked " + decimal.Round(totalBooked, 2).ToString();
}
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;
//Add controls
item.Controls.Add(chk);
}
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" >
<Items>
<telerik:RadPanelItem Text="root" Expanded="false">
<ContentTemplate>
</ContentTemplate>
</telerik:RadPanelItem>
</Items>
</telerik:RadPanelBar>
<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");
}
}
</script>
I´ve 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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Jun 3, 2010
I hav a prob of checkboxes' checks not being registered...as explained below :
I have a gridview which is being populated using datasets.
[Code]....
I have added a column of checkboxes it using a TemplateField
[Code]....
And I am using a button to count the number of checked checkboxes.
[Code]....
I am viewing the value of session variable under at check.aspx
The Problem is that no matter how many checkboxes I check they are always counted as 0. The 'check' just doesnt get regsitered in the gridview.
After quite certain testing, a few things are clear
The checkboxes are being discovered by the counting loop fine.If I mark a cell as checked in the dataset before binding, then that check does get registered and thus is counted. Any thing I am missing ? Do i have to update something ?
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Mar 30, 2010
I have a treeview on an ASP site that I populate from a DB using a Stored Proc that delivers XML. I am using an XML datasource that is loaded from the SP programmatically in the dadtasource's onload handler (if there is a way to load it from an SP declaratively, let me know). The treeview has its 'ShowCheckboxes' property set to "Leaf" (see code below) so that any leaf node can be checked.
The problem is this - I have a 'Checked' attribute in the leaf nodes of the XML (see below) that I would like to have databound to the treeview (I have databound the Name and ID attributes successfully) and I can't seem to find a way to do this. I also tried programmatically, but the treenode's dataitem property seems to have the value 'Nothing' even after the tree is databound.
How do I bind the 'Checked' attribute to the treeview's checkboxes? (Prefereably declaratively)
Example of XML here:
[Code]....
Note that nodes have Name and ID attributes, and Leaf nodes have Chacked attribute.
Here is the declaration of my treeview:
[Code]....
Here is the declaration of my XML datasource
[Code]....
And here is the onload event handler:
[Code]....
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Mar 10, 2011
Im trying to input the value in the table into the checkboxes but i keep getting an error that states: "Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index"When i do a quick on this part of the code :"DirectCast(GridView1.Rows(i).FindControl("DescriptionA1"), Label).Text", i get "Run-time exception thrown". This is my first time trying something like that, i have search for solutions but now im more confused than ever.
[Code]....
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Dec 14, 2010
I am writing a search application for a large dataset of images of algae.
The search is in two steps: first some general search criteria is filled out. Next a list of species that fit the general criteria shows up and the user checks which species they would like to see. Finally a list of images comes up that both fit the general search criteria and belong one of the species that the user had checked. I'm trying to decide the best way to do this, I thought about two potential ways...
One way: I can add all the checked species to a WHERE clause in the SQL statement that gives me my image search results. I dont like this though... its possible the user selects 100+ species and this would make for a very very long WHERE clause.
Another way: I could leave my SQL statement so it only takes into account the general search criteria. Then when I go to display the results, maybe I could choose not to display a record if it does not belong to a species that was checked by the user.
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Apr 23, 2012
In Datalist Item Template Another Datalist And Child Datalist How can we access link button inside chile datalist when click in child link button
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Dec 3, 2013
Here is my code through which i can generate dynamically 2 checkbox group Â
DataTable dt = new DataTable();
DataList1.DataSource = dt;
DataList1.DataBind();
DataList2.DataSource = dt;
DataList2.DataBind();
 Design Page Â
[code]....
 There is two checkbox group which have same datasource, so in both case same checkbox are showing and also same event is firing for both. Here is the event code Â
protected void CheckBox_CheckedChanged(object sender, EventArgs e)
{
string OpService = ((CheckBox)sender).Text;
}
Â
Now what i want to do is, while check one checkbox from the 1st checkbox group the same checkbox should be selected from the second checkbox group automatically, also if i deselect one checkbox that should be deselect from both checkbox group.
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