Web Forms :: How To Access Control In Postback Event Dynamically Created Template Columns In Datagrid
May 27, 2010
I need to access the controls dynamically created template fields at run time in datagrid in post back event. Is there any way to retrieve the values in post back event? Or else give the ideas to acheive my requirement. I need to create no of rows and columns as text box as per user input. After fill the values to text box , i need to access the values in submit button.
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Jun 11, 2010
My problem is:
I've got a table, dynamically created, fill with a lot of dropdownlists witches IDs are dynamically created.
When a button is pressed, I need to scan all controls in the table and save their value.
But after the postback I can't no longer access to the table.
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Sep 20, 2010
I have a script which creates a dynamic textbox (and more) in an AJAX async post back. But when I try to acess the textbox I am told "Object reference not set to an instance of an object". I have been strugleing with this for a long time. This is written in C# .Net 4. The line causing the problem is the very last one where I have tbGameName.Text.Trim()
[Code]....
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Jul 12, 2010
created a control dynamicly in page_load event then cant i make that control globaly available in each class?
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Jul 8, 2010
I'm creating some linkbuttons dynamically and assigning properties like below. Also I'm adding an event handler to the created link button:
[Code]....
What happens here is when the links created at runtime are clicked, most of the links are linked to other applications. (e.g from app1 to app2, app1 to app3 etc..) So when moving from the current app to the next I want to abandon the current session. However, this event is not firing before navigating to the next page. Could someone suggest a workaraound or the correct way to accomplish that?
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Feb 10, 2010
I have a dynamically created address user control (on a customer administration screen) that is created through the use of a place holder. A customer can have multiple addresses, so they dynamically dropped onto the page.
I have got this far, but now I need to be able to save the updated addresses for the customer but I can't get any event to fire on the user controls. When I check to see run plhAddress.HasControls() it returns false?
The way I am generating the user controls is as follows.. private UserControl LoadControl(string UserControlPath, params object[] constructorParameters)
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Sep 16, 2010
im creating a button control in page int and im assing a click event for the button control. here the click event is not firing for the first time. here is my code.
[Code]....
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Mar 4, 2011
can i implement multiple column sorting in an ASP.NET DataGrid.Datagrid contains Template columns.
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Aug 4, 2010
i want to create dynamically inside a datagrid templatecolumn some buttons and i wonder how can i refer to them from the vb code..
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Sep 25, 2010
I've a JavaScript function in my page through which i make some elements in the page as 'JQuery UI droppable'.
function setDroppableTargets()
{
$(.cssDockZone).droppable();
}
But the elements with the class cssDockZone is created dynamically upon user interaction. So in the code behind i create the control first and finally at the end i register a scriptblock which calls setDroppableTargets().
//set droppable targets ClientScript.RegisterClientScriptBlock(this.GetType(), "setDroppableTargets", "setDroppableTargets()", true);
But the javascript function is invoked before the controls are created eventhough i register the script at the end (after creating the controls) and i cross checked it by getting the elements with class name '.cssDockZone' and i getting it as 0.
$(.cssDockZone).length
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Jan 3, 2011
I have a datagrid with two columns ( File Name, and Date Created ). I want them to be sorted when clicked (ASC or DESC). I went into the design view and added the allow sorting feature and added the column names, so they are clickable in the header of the data grid. I also already added the onsortcommand as well.
My datagrid is named dgFileList and the onsortcommand method is named dgFileList_SortCommand.
The procedure that is already loading on page load is a DataSet. (where I think my problem is)I dont have anything in the back end beside the dgFileList_Sortcommand method. From what I have read, it seems like I can't use a DataSet to be sorted...I'm using visual studios 2005, C#, not VB.
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Jul 24, 2010
am adding control dynamically in button click event in asp .net i have one more button when i clicked the added control is disappeared .
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May 6, 2010
Im basically listing a set of facilities in a datagrid. Like so:b Projectorcb Laptopcb TelevisonIn roomview, a check appears where a facility is availble in a room. This part works fine.The user can then edit the facilities, by clicking on the check beside each facility. When the update button is pushed I need to record the value of the checkbox, however I cant get the value of the checkbox.eres my codebehind:
[Code]....
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Sep 30, 2010
I have "Order" object with Columns Ticket,OTP and CustomerName etc.Intially on DataGrid, I'm binding Ticket only , when user clicks on "Column Chooser" button, another windows appears to pickup CustomerName,OTP columns to add specified column dynamically on Datagrid. Environment : Asp.net ,C# with Object Data source
Public Class Order
{
publc void Order()
{
}
public string Ticket
{
get
{
return this.strTicket;
}
set
{
this.strTicket = value;
}
}
public string OtpNumber
{
get
{
return this.strOtpNumber;
}
set
{
this.strOtpNumber = value;
}
}
public string CustomerName
{
get
{
return this.strCustomer;
}
set
{
this.strCustomer = value;
}
}
}
}
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Jan 13, 2010
I m trying to add template columns at run time. but it get lost on post back ,
I have to add columns on postback ,what approch should i use that the columns should not diappear at postback
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Jun 7, 2010
In my code I create a table dynamically and I try to restore the table after a postback. But although I recreate the table during the Page_Load event with the same id's before,the table doesn't appear with the same state and values as before.
I think it will be a typically beginner error, but I wasn't be able to locate the error whereas reading different posts and tutorials related to this topic.
//Code behind
protected void Page_Load(object sender, EventArgs e)
{
if (Page.IsPostBack & _hfsubmittedURL.Value == "tbCreated")
{
TableRow row1 = new TableRow();
[Code].....
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Jun 2, 2010
Need row editing on page_load for all the cells and need to validate each cell entry. Means cell1 one entery isvalid it fills thrid cell and insert or update to a table in the database. How do i handle on tab clicking to update in databse.
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Jul 27, 2010
I am using autogeneratecolumns ="false" and using some template fields.
It works when I use:
tempColumnNew = Me.DataGrid.Columns(oldColIndex)
tempColumnOld = Me.DataGrid.Columns(newColIndex)
Me.DataGrid.Columns.RemoveAt(oldColIndex)
Me.DataGrid.Columns.RemoveAt(newColIndex)
Me.DataGrid.Columns.AddAt(oldColIndex, tempColumnOld)
Me.DataGrid.Columns.AddAt(newColIndex, tempColumnNew)
But it doesnt remember the added columns on postback, so I have to add them for every postback.
Is there a better way to implement it?
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Nov 8, 2010
I know this has been asked before, but I feel like I'm losing my way trying to follow the other examples out there. Does anyone see a straightforward solution to my particular problem?
Goal:
Two column Master Page
Left column contains a list of [stuff] (I'm trying a Repeater with LinkButtons)
Right column contains a TabContainer which will add dynamically created tabs when buttons on the left are clicked.
Left side looks like this:
<asp:Repeater
<ItemTemplate>
<asp:LinkButton ID="lbShowReport" runat="server" Text='<%# Eval("Title") %>' CommandName="Select">
</asp:LinkButton>
<asp:HiddenField ID="hfReportID" runat="server" Value='<%# Eval("Id") %>' />
</ItemTemplate>
</asp:Repeater>
I had initially been creating tabs in the LB's OnCommand event, but of course this means that any tab generated by one click is lost if the user clicks another LinkButton.
So I moved the code to create a new tab to the OnInit section of the page and attempted to loop through the RepeaterItems comparing the UniqueId of each LinkButton until I found the one that was clicked using Request.Form["__EVENTTARGET"].
When I tried to loop through the RepeaterItems, however, the count was always 0, and the Repeater would not populate.
So now I am rebinding the Repeater in the Init section on every post-back - this allows me to find the LinkButton that was clicked. I then add the new Tab based on the LB that was clicked like this:
[Code]....
This properly adds new Tabs to the TabContainer using this code:
[Code]....
but I still have the issue where I can only ever have one dynamically created tab in the TabContainer at a time. All of the code above is being executed in OnInit, which I thought would save the tabs during post-backs, but instead this is behaving as tho I was adding the tabs in the OnCommand event of the Link Button...
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Mar 25, 2011
I have created a gridview dynamically from scratch and added it to my aspx page. This works fine, but i have a button in the footer of on of the columns, which when clicked on makes the gridview disappear and doesn't fire the onclick event that it should. This should obviously not be the case. My question is why does the event not fire and why does the gridview vanish? Bear in mind i have never created aa gridview in the code behind before, so excuse me if i am being dense
Code creating columns
Dim gvTownships As New GridView
'COLUMNS
Dim tmpCategory As New TemplateField
tmpCategory.ItemTemplate = New cGridViewTemplate(DataControlRowType.DataRow, "Category")
tmpCategory.HeaderTemplate = New cGridViewTemplate(DataControlRowType.Header, "Category")
tmpCategory.FooterTemplate = New cGridViewTemplate(DataControlRowType.Footer, "Calculation")
'INFORMATION
gvTownships.AutoGenerateColumns = False
gvTownships.ID = cmbChoice.SelectedItem.Text
gvTownships.ShowFooter = True
gvTownships.CssClass = "mGrid"
gvTownships.RowStyle.Wrap = False
gvTownships.HeaderStyle.CssClass = "mgrid"
gvTownships.HeaderStyle.Wrap = True
gvTownships.FooterStyle.CssClass = "mGridtf"
gvTownships.AlternatingRowStyle.CssClass = "alt"
gvTownships.GridLines = GridLines.Both
'add columns
gvTownships.Columns.Add(tmpCategory)
gvTownships.DataSource = dstSuburbTowhShip
gvTownships.DataBind()
Code to add button to footer
Sub InstantiateIn(ByVal container As System.Web.UI.Control) _
Implements ITemplate.InstantiateIn
Case DataControlRowType.Footer
If columnName = "Calculation" Then
Dim btnCalculate As New Button
btnCalculate.Text = "Calculate"
btnCalculate.CssClass = "button"
'add handler
AddHandler btnCalculate.Click, AddressOf btnCalculate_Clicked
container.Controls.Add(btnCalculate)
End If
Case Else
' Insert code to handle unexpected values.
End Select
End Sub
Private Sub btnCalculate_Clicked(ByVal sender As Object, ByVal e As EventArgs)
Try
Dim btnCalculate As Button = CType(sender, Button)
Dim gvRow As GridViewRow = CType(btnCalculate.NamingContainer, GridViewRow)
btnCalculate.CommandArgument = "Calculate"
Catch ex As Exception
End Try
End Sub
End Class
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Jan 13, 2011
I have a couple of RadioButtons that are created dynamically. But after postback they don't retain their checked property. I also have some CheckBoxes and they work just fine using the same mechanism (code below). I have narrowed down the problem to the "GroupName" property. If I remove it, it works just fine. But I need the RadioButtons to be mutually exclusive.
[Code]....
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Jun 2, 2010
My problem is as follows. I have a custom GridView control where I generate the Template fields for each column. I'm using someone elses class that extends the Itemplate and returns lables for ItemTemplate, and TextBoxes for EditTemplate.
I need this in order to implement bulk edit for the gridview where users press button Edit and all fields become textboxes, they can then change the values, and click Update button at which point I need to be able to retrieve the values from the TextBoxes in these Template Fields.
What I have tried thus far: when user clicks Edit button, my dynamic code builds the columns and specifies that the Template field is an EditTemplate, it then adds these columns to the grid view. The gridview shows the textboxes with all values retrieved from sqldatasource.
When I press the Update button, the page does a postback, as I can see Page_Load event fire, I check for a flag that I previously set when the Edit button was pressed (I store it's value in View State) and call the Update method.
In it I iterate throught the gridview rows collection, check that the RowType of each row is DataRow and call GridView.UpdateRow(i, false), passing each rows index to the UpdateRow method.At this point I have tried everything I can to find the values stored in the textboxes, but I cannot find any of the textbox controls.
I've tried using the current row's FindControl method and specifying the name of the textbox field,I've tried using Request.Params method where I can tried passing the client id, as it seen in the View Source of the page such as this
Request.Params["grid1$gvData$ctl02$MMCODE"]
Still no luck, I've tried going up an down the Row's cells, controls collections, it seem to list the counts for rows correctly, the same goes for the amount of cells for each row, but at no point was I able to actually locate any controls such as textboxes or anything else and retrieve any values from them.
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Aug 13, 2010
I created a templatefield programmatically and it works fine but whenever I clicked the button inside the gridview and do the postback my templatefield are gone.
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Jan 20, 2010
i am desigining an application where i m creating checkBox (not checkBoxList) dynamically. There is one master check box that define group if i click that it should click all subCheck box under it.I am using ajax in my application.i am able to generate check box at runtime but not able to find its event here is the code for creating check
box and its event.
//This define master check box
CheckBox MstChk = new CheckBox();
MstChk.ID = Str_Header;
MstChk.AutoPostBack = true;
MstChk.CheckedChanged += new System.EventHandler(MstChk_CheckedChanged);
[code]...
now problem is here when i click on masterCheckBox i am not able to get Evnet MstChk_CheckedChanged but if call DesignUserPrivilegePnl() in page_init instant of Page_Load i am able to get the event but then i get erro object instatnt not set to an instat of object at foreach (Control Child in Parent.Controls)i am googled but still not get the solution hope you people will guide to overcome my error
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Jan 28, 2011
I need to generate a gridview with dynamic columns, on each cell I need a button that inserts-deletes a relationship in a database. The relationship is of course between what is represented by each column and row. I decided to use a gridview and create templatefields which I add programmatically to the table. I successfully got to that point but when i decided to raise a click event from the buttons or a rowcommand from the gridview I could not do it. I´m looking into doing this with button fields right now but I´m curious on how this can be accomplished?
Code:
[Code]....
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