How to override control's values in Edit Form

[Dom]

I'm using Edit Form to insert/edit items. The problem I'm running into is when I try to edit a row, it's using the same form and some of the controls are not set to what data item for that grid item actually has. When in the life cycle can I set selected values for my RadComboBoxes and RadNumericTextBoxes, any code examples?

[Shinu]

Hello,

You can access the controls in ItemDataBound event as shown below.
C#:

protected void RadGrid1_ItemDataBound(object sender, Telerik.Web.UI.GridItemEventArgs e)
{
 if (e.Item is GridEditableItem && e.Item.IsInEditMode)
 {
 GridEditableItem itm = (GridEditableItem)e.Item;
 RadNumericTextBox txt = (RadNumericTextBox)itm.FindControl("RadNumericTextBox1");
 }
}

Also take a look at the following demo.
Grid / Form Template Edit Form

-Shinu.

[Dom]

I'm still having troubles accessing control values, this time it's during update.

Here's markup for my edit form

<EditFormSettings EditFormType="Template">
                                <FormTemplate>
                                    <div class="EditFormDiv">
                                        <manatron:RadComboBox runat="server" ID="NewTag" Label="TAG:" Width="50%" DataSource="<%# Ctl.TaxAuthorityGroups %>"
                                            DataTextField="Descr" DataValueField="Id" />

                                        <manatron:RadNumericTextBox runat="server" ID="NewRate" Label="Rate:" DataType="System.decimal"
                                            EmptyMessage="0" NumberFormat-DecimalDigits="8" />
                                        <div style="text-align: right; display: inline">
                                            <manatron:RadButton ID="AddRate" runat="server" Text="Apply" CommandName='<%# (Container is GridEditFormInsertItem) ? "PerformInsertRate" : "UpdateRate" %>' />
                                            <manatron:RadButton ID="CancelRate" runat="server" Text="Cancel" CommandName="Cancel" />
                                        </div>
                                    </div>
                                </FormTemplate>
                            </EditFormSettings>

and server-side code

protected void TimberTaxMaintGridItemCommand(object sender, GridCommandEventArgs e)
        {
            switch(e.CommandName)
            {
                case GridCommands.PerformInsertTafCommandName:
                    PerformInsertTaf( e );
                    break;

                case GridCommands.PerformInsertRateCommandName:
                    PerformInsertRate( e );
                    break;

                case GridCommands.CopyRateCommandName:
                    CopyRate( e );
                    break;

                case GridCommands.EditRateCommandName:
                    //Since we use Form Template to insert/edit we need to know when we're editing to handle user clicking Apply differently
                    _editingRate = true;
                    EditRate( e );
                    break;

                case GridCommands.UpdateRateCommandName:
                    UpdateRate( e );
                    break;

                case GridCommands.DeleteTafCommandName:
                    break;

                case GridCommands.DeleteRateCommandName:
                    break;
            }
        }

        protected void TimberTaxMaintGridItemDataBound(object sender, GridItemEventArgs e)
        {
            if (e.Item.OwnerTableView.Name == "TAGRates" && e.Item is GridEditableItem && e.Item.IsInEditMode && _editingRate)
            {
                var item = ( GridEditableItem ) e.Item;
                var tagControl = ( RadComboBox ) item.FindControl( "NewTag" );
                var rateControl = ( RadNumericTextBox )item.FindControl( "NewRate" );
                var applyControl = ( RadButton ) item.FindControl( "AddRate" );

                if (tagControl == null || rateControl == null || applyControl == null)
                {
                    Ctl.Messages.Add( "Unexpected error occured while editing TAG rate.", MessageType.Error );
                    return;
                }
                var dataItem = ( TimberTaxYieldRate ) item.DataItem;
                tagControl.SelectedValue = dataItem.TagId.ToString( CultureInfo.InvariantCulture );
                rateControl.Value = Convert.ToDouble( dataItem.Rate );
            }
        }
private void EditRate(GridCommandEventArgs e)
        {
            if ( e.Item.OwnerTableView.ChildSelectedItems.Count != 1 )
            {
                Ctl.Messages.Add( "Please select 1 TAG Rate to edit.", MessageType.Error );
                return;
            }
            var selectedItem = ( GridDataItem ) e.Item.OwnerTableView.ChildSelectedItems[ 0 ];
            selectedItem.FireCommandEvent( RadGrid.EditCommandName, null );
        }

        private void UpdateRate(GridCommandEventArgs e)
        {
            var item = ( GridEditableItem ) e.Item;
            var tagControl = ( RadComboBox ) item.FindControl( "NewTag" );
            var rateControl = ( RadNumericTextBox ) item.FindControl( "NewRate" );

            if (tagControl == null || rateControl == null) return;

            var rate = rateControl.Value == null ? 0m : Convert.ToDecimal(rateControl.Value.Value);
            var tagId = Convert.ToInt32(tagControl.SelectedValue);
            var tag = Ctl.TaxAuthorityGroups.First(t => t.Id == tagId);
            Ctl.DataSource[ item.OwnerTableView.ParentItem.DataSetIndex ].Rates[ item.DataSetIndex ].TagId = tag.Id;
            Ctl.DataSource[ item.OwnerTableView.ParentItem.DataSetIndex ].Rates[ item.DataSetIndex ].TagShortDescr = tag.ShortDescr;
            Ctl.DataSource[ item.OwnerTableView.ParentItem.DataSetIndex ].Rates[ item.DataSetIndex ].TagDescr = tag.Descr;
            Ctl.DataSource[ item.OwnerTableView.ParentItem.DataSetIndex ].Rates[ item.DataSetIndex ].Rate = rate;
            item.FireCommandEvent(RadGrid.CancelCommandName, null);
            item.OwnerTableView.DataBind();
        }

The problem I'm having now is when UpdateRate() executes both tagControl and rateControl are null. Why is that?

[Dom]

Also, how come when I click Apply button on the edit form, e.Item passed to TimberTaxMaintGridItemCommand() is GridDataItem type, but when I click cancel it's GridEditFormItem? Shouldn't they be the same for both events?

[Antonio Stoilkov]

Hello,

You could find both controls by accessing the item EditFormItem value in which the two controls reside as it is shown below.

GridDataItem dataItem = e.Item as GridDataItem;
if (dataItem != null)
{
    RadComboBox tagCombo = dataItem.EditFormItem.FindControl("NewTag") as RadComboBox;
    RadNumericTextBox rateNumeric = dataItem.EditFormItem.FindControl("NewRate") as RadNumericTextBox;
}

The item types for the Update and Cancel are different because when updating you are working with the DataItem not the EditFormItem. When closing you are accessing the EditForm and not operating on the DataItem.

Additionally, you could go through the help article for more in depth information on how to access elements in RadGrid.

• Accessing Cells and Rows

Kind regards,
Antonio Stoilkov
the Telerik team