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RadGrid dynamic fromtemplate couldnt retrieve data from control

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Grid

This is a migrated thread and some comments may be shown as answers.

Petrofac asked on 04 Sep 2011, 07:05 AM

Hi,

I am trying to create a add controls dynamically from the server side in Form template. I am able to create controls and display the controls in Formtemplate but i couldnt find controls in the server side to the values from controls.

Add Controls code sample

Protected Sub rdGridUDFRule_ItemDataBound(ByVal sender As Object, ByVal e As Telerik.Web.UI.GridItemEventArgs) Handles rdGridUDFRule.ItemDataBound

If TypeOf e.Item Is Telerik.Web.UI.GridEditFormItem And e.Item.IsInEditMode Then

If e.Item.OwnerTableView.IsItemInserted Then

'item is about to be inserted

For Each editItem As Telerik.Web.UI.GridEditFormItem In rdGridUDFRule.MasterTableView.GetItems(Telerik.Web.UI.GridItemType.EditFormItem)

If (editItem.IsInEditMode) Then

Dim plcHolder As HtmlTableCell = DirectCast(editITem.FindControl("placeHolderRadGridFormTemplate"), HtmlTableCell)

Dim objDynamicTxt As New TextBox

objDynamicTxt.ID = "DynamicControl"

objDynamicTxt.MaxLength = intLength

plcHolder.Controls.Add(objDynamicTxt)

End If

Next

Else

'item is about to be edited

Dim editedItem As Telerik.Web.UI.GridEditableItem = TryCast(e.Item, Telerik.Web.UI.GridEditableItem)

End If

End Sub

Retrieve Dynamic control values from server side sample code

Protected Sub RadGrid1_UpdateCommand(ByVal sender As Object, ByVal e As GridCommandEventArgs) Handles rdGridUDFRule.UpdateCommand

If (e.CommandName = RadGrid.UpdateCommandName) Then

For Each editItem As Telerik.Web.UI.GridEditFormItem In rdGridUDFRule.MasterTableView.GetItems(Telerik.Web.UI.GridItemType.EditFormItem)

If (editItem.IsInEditMode) Then

Dim plcHolder As HtmlTableCell = DirectCast(editITem.FindControl("placeHolderRadGridFormTemplate"), HtmlTableCell)

Dim objDynamicTxt As TextBox = DirectCast(plcHolder.FindControl("DynamicControl")

'******************************* THE objDynamicTxt RETURN NOTHING *******************************

End If

Next

End If

End Sub

The Couldnt find the controls, but it is available in the FormTemplate while trying to click on the add new record.

Please let me know in which event the dynamic controls should be created

Thanks
Prabhu

7 Answers, 1 is accepted

Accepted

answered on 09 Sep 2011, 08:42 AM

Hello Prabhu,

You have to create the controls in the ItemCreated event and then (if needed) populate them with data on ItemDataBound.
Distinguishing the major differences between ItemCreated and ItemDataBound events
Note that you don't have to check whether the item is in edit mode in the UpdateCommand handler.

Let me know if you need more information.

Regards,
Daniel
the Telerik team

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answered on 14 Sep 2011, 08:09 AM

Hello Daniel,

Thanks a lot for reply. Actually all my RadGrid Columns are dynamic i have to create columns based on a page state information of the page. Please let me know the right place to create a dynamic columns in the RadGrid

Issue Description: (Example Scenario)
I have a Dropdown list which says how many columns to be created in the RadGrid on the page.
But i couldnt get the number of columns to be created from the dropdownlist selected value in RadGrid ItemCreated event (It always shows the default value), because i believe the RadGrid ItemCreated event occurs before the page load event. Only of page load event i m getting the dropdownlist selected value.

Workaround done:
Currently i m able the selected dropdownlist value in the RagGrid ItemCreated event from the querystring. I m passing the selected value in the querystring, but i have some other issues (security, validation issues) on following this method.

Please let me know the correct method to get the page state information and create the columns in RadGrid.
Appreciate you quick response.

Thanks
Prabhu

Accepted

answered on 01 Jul 2015, 07:42 PM

I have the same problem, I'm getting dynamic text boxes in the <formtemplate>, but when I want to access the controls in the ItemCommand, the panel is empty .

please i need an idea. Thankyou

<telerik:RadGrid runat="server" Id="grdConceptos"

skin="Outlook" EnableEmbeddedSkins="False" DataSourceID="SqlEquipos"

AllowPaging="True" PageSize="20" AllowSorting="True" AutoGenerateColumns="False" Culture="es-MX" TableLayout="Fixed"

ShowStatusBar="true" AllowAutomaticDeletes="True" AllowAutomaticInserts="True"

AllowAutomaticUpdates="True" Width="100%" EnableViewState="true" >

<MasterTableView CommandItemDisplay="TopAndBottom" GridLines="None"

InsertItemPageIndexAction="ShowItemOnCurrentPage" DataSourceID="SqlEquipos"

DataKeyNames="IdEquipo" AllowFilteringByColumn="true" AllowSorting="True">

<CommandItemTemplate>

......

</CommandItemTemplate>

<columns>

....

</columns>

<EditFormSettings EditFormType="Template" >

<FormTemplate>

<table style="width: 100%;">

<tr>

<td colspan="2" class="titulo2">

 Edición del equipo:

<asp:Label ID="lbIdEquipo" Text='<%# Bind("IdEquipo") %>' runat="server" Width="70px"/>

 

</td>

</tr>

<tr>

<td class="tipografiaBOLD">

 * Cliente:

</td>

<td>

<telerik:RadComboBox ID="ddlCliente" DataSourceID="SqlCliente" DataTextField="Nombre"

DataValueField="IdCliente" Height="300px" AppendDataBoundItems="true"

AllowCustomText="True" Filter="Contains"

SelectedValue='<%# Bind("IdCliente") %>'

runat="server" ShowMoreResultsBox="true" EnableLoadOnDemand="true" EnableVirtualScrolling="true"

Width="350px">

<Items>

<telerik:RadComboBoxItem Text="Seleccionar..." value=""/>

</Items>

</telerik:RadComboBox>

</td>

</tr>

<tr>

<td class="tipografiaBOLD">

 * Unidad:

</td>

<td>

<telerik:RadComboBox ID="ddlUnidad" DataSourceID="SqlUnidad" DataTextField="Unidad"

DataValueField="IdUnidad" Height="300px" AppendDataBoundItems="true"

AllowCustomText="True" Filter="Contains"

SelectedValue='<%# Bind("IdUnidad") %>'

runat="server" ShowMoreResultsBox="true" EnableLoadOnDemand="true" EnableVirtualScrolling="true"

Width="100px">

<Items>

<telerik:RadComboBoxItem Text="Seleccionar..." value=""/>

</Items>

</telerik:RadComboBox>

</td>

</tr>

<tr>

<td class="tipografiaBOLD">

 * Marca:

</td>

<td>

<telerik:RadComboBox ID="ddlMarca" DataSourceID="SqlMarca" DataTextField="Marca"

DataValueField="IdMarca" Height="300px" AppendDataBoundItems="true"

AllowCustomText="True" Filter="Contains"

SelectedValue='<%# Bind("IdMarca") %>'

runat="server" ShowMoreResultsBox="true" EnableLoadOnDemand="true" EnableVirtualScrolling="true"

Width="250px">

<Items>

<telerik:RadComboBoxItem Text="Seleccionar..." value=""/>

</Items>

</telerik:RadComboBox>

</td>

</tr>

<tr>

<td class="tipografiaBOLD">

 * Tipo de Equipo:

</td>

<td>

<telerik:RadComboBox ID="ddlTipoEquipo" DataSourceID="SqlTipoEquipo" DataTextField="TipoEquipo"

DataValueField="IdTipoEquipo" Height="300px" AppendDataBoundItems="true"

AllowCustomText="True" Filter="Contains"

SelectedValue='<%# Bind("IdTipoEquipo") %>'

runat="server" ShowMoreResultsBox="true" EnableLoadOnDemand="true" EnableVirtualScrolling="true"

Width="150px">

<Items>

<telerik:RadComboBoxItem Text="Seleccionar..." value=""/>

</Items>

</telerik:RadComboBox>

</td>

</tr>

<tr>

<td colspan="2">

</td>

</tr>

</table>

<asp:Panel ID="ctrlDynamic" runat = "server"></asp:Panel>

<asp:Button ID="btnActualizar" Text='<%# IIf((TypeOf(Container) is GridEditFormInsertItem), "Insertar", "Actualizar") %>'

runat="server" CommandName='<%# IIf((TypeOf(Container) is GridEditFormInsertItem), "PerformInsert", "Update")%>'></asp:Button>

<asp:Button ID="btnCancelar" Text="Cancelar" runat="server" CausesValidation="False"

CommandName="Cancel"></asp:Button>

 

</FormTemplate>

</EditFormSettings>

</MasterTableView>

</telerik:Radgrid>

Protected Sub grdConceptos_ItemDataBound(ByVal source As Object, ByVal e As Telerik.Web.UI.GridItemEventArgs) Handles grdConceptos.ItemDataBound

If (TypeOf e.Item Is GridEditFormItem And e.Item.IsInEditMode) Then

Dim editItem As GridEditFormItem = DirectCast(e.Item, GridEditFormItem)

IdTipoEquipo = DirectCast(editItem.FindControl("ddlTipoEquipo"), RadComboBox).SelectedValue

IdEquipo = DirectCast(editItem.FindControl("lbIdEquipo"), Label).Text.Trim()

ctrlDynamic = DirectCast(editItem.FindControl("ctrlDynamic"), Panel)

Dim colEq As oColumna = New oColumna()

Dim listaCol As List(Of oColumna) = New List(Of oColumna)

Dim datos As List(Of String) = New List(Of String)

listaCol = colEq.ObtieneColumnasEquipoValor(IdEquipo, sesion.IdLaboratorio)

Dim tbl As Table = New Table()

For i As Integer = 0 To listaCol.Count - 1

Dim lbl As New Label()

lbl.ID = "lbl" + listaCol(i).Nombre

lbl.Text = listaCol(i).Nombre

Dim tcLabel As TableCell = New TableCell()

tcLabel.Controls.Add(lbl)

'ctrlDynamic.Controls.Add(lbl)

Dim txt As New TextBox()

txt.Attributes.Add("style", "margin-bottom: 10px")

txt.ID = "txt" + listaCol(i).Nombre

txt.Text = listaCol(i).Valor

Dim tcTxt As TableCell = New TableCell()

tcTxt.Controls.Add(txt)

Dim tr As TableRow = New TableRow()

tr.Cells.Add(tcLabel)

tr.Cells.Add(tcTxt)

tbl.Rows.Add(tr)

ctrlDynamic.Controls.Add(tbl)

Next

End If

End Sub

Protected Sub grdConceptos_ItemCommand(ByVal source As Object, ByVal e As Telerik.Web.UI.GridCommandEventArgs) Handles grdConceptos.ItemCommand

If e.CommandName = "Update" Then

If (TypeOf e.Item Is GridEditFormItem And e.Item.IsInEditMode) Then

Dim editItem As GridEditFormItem = CType(e.Item, GridEditFormItem)

Dim c As oColumna = New oColumna()

Dim idCliente As RadComboBox = DirectCast(editItem.FindControl("ddlCliente"), RadComboBox)

Dim idunidad As RadComboBox = DirectCast(editItem.FindControl("ddlUnidad"), RadComboBox)

Dim IdMarca As RadComboBox = DirectCast(editItem.FindControl("ddlMarca"), RadComboBox)

Dim IdTipoEquipo As RadComboBox = DirectCast(editItem.FindControl("ddlTipoEquipo"), RadComboBox)

c.UpdateEquipo(IdEquipo, idCliente.SelectedValue, idunidad.SelectedValue, IdMarca.SelectedValue, IdTipoEquipo.SelectedValue)

Dim colEq As oColumna = New oColumna()

Dim listaCol As List(Of oColumna) = New List(Of oColumna)

listaCol = colEq.ObtieneColumnasEquipo(IdTipoEquipo.SelectedValue, sesion.IdLaboratorio)

ctrlDynamic = DirectCast(editItem.FindControl("ctrlDynamic"), Panel)

Dim txt1 As TextBox = New TextBox()

txt1 = DirectCast(ctrlDynamic.FindControl("txtMVA"), TextBox)

For i As Integer = 0 To listaCol.Count - 1

Dim txt As TextBox = New TextBox()

txt = DirectCast(editItem.FindControl("txt" + listaCol(i).Nombre), TextBox)

c.UpdateEquipoColumna(IdEquipo, listaCol(i).IdColumna, txt.Text)

Next

End If

End Sub

answered on 06 Jul 2015, 08:03 AM

Hi Lilith,

Since you are creating the controls in the server-side OnItemDataBound event, those controls will not be persisted after the next postback, because that event is too late in the page's life cycle. If you need to the controls that you are adding dynamically to the Panel to persist you will have to add them within an earlier event - OnItemCreated.

I understand that the values that you need will not be present within the OnItemCreated event, but you could create all of the controls within that event and within the OnItemDataBound event, hide those that will not be used.

Hope this helps.

Regards,
Konstantin Dikov
Telerik

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answered on 17 Aug 2015, 10:07 AM

Dear all,
My requirement is Bind the grid dynamic , and add the controls like Text Box And rad Como box at run time by Item value.
so far have done the control adding and now my grid is ready to take values from user ,
but when user selected value from rad combo box (dynamic added control in grid), and click the save button i cannot find the Rad Combo box
pls suggest me the way how to get the values for dynamically added controls in Rad-grid on button click.
below are the steps i followed
1. Added Grid in Aspx. with Autogenerated Column = true
2. On Item created event added dynamic controls in Grid.
3. bind the data to ad combo box (dynamic added control in grid)
4. on save Button i have to save the selected values from rad combo box (dynamic added control in grid), to data base
in above step 1 to 3 are done , but step 4 making me trouble .

below is code for button click.
protected void btnSaveAll_Click(object sender, EventArgs e)
{
Questionnaire MyQue = Questionnaire.getQuestionnaire(mQuestionnaireid);
ArrayList ColumnLst = GetColumnList();
Dictionary<string,string> RowSplitValue = new Dictionary<string,string>();
foreach (GridEditableItem Item in rgPivotQuestionnaireResult.MasterTableView.Items)
{
foreach (GridColumn Column in rgPivotQuestionnaireResult.MasterTableView.RenderColumns)
{
if (ColumnLst.Contains(Column.UniqueName))
{
//RowSplitValue = new Dictionary<string, string>(Item.SavedOldValues[Column.UniqueName]);
if (Item[Column].Controls.Count > 0)
{
Control ItemControle= new Control();
ItemControle = Item[Column].Controls[0];
if (ItemControle is TextBox)
{
TextBox TxtBx = (TextBox)Item[Column].Controls[0];
}
if (Item[Column].Controls.Count > 1)
{
ItemControle = Item[Column].Controls[1];
if (ItemControle is RadComboBox)
{
RadComboBox RCB = (RadComboBox)Item[Column].Controls[1];
MyQue .Answervalue = RCB.SelectedValue;
}
}
}
}
}
}
MyQue .Save();
}