How do I get a reference to a GridDropDownColumn within Grid

[Dan]

Good day,

I'm using the ASP.NET ajax grid version 2008.1.619.35. I'm trying to get a reference to a GridDropDownColumn with in my grid during edit mode.

I receive the following complier error message

"Error 14 Cannot convert type 'System.web.UI.Control' to 'Telerik.web.UI.GridDropDownColumn'

Here is my code

protected void RadGrid1_EditCommand(object source, GridCommandEventArgs e)
{
       //Is it a GridDataItem
       if (e.Item is GridDataItem)
       {

           //Get the instance of the right type
           GridDataItem dataBoundItem = e.Item as GridDataItem;
           if (dataBoundItem.OwnerTableView.Name == "OrderHeader")
           {
                  GridDropDownColumn ddlStatus =(GridDropDownColumn) dataBoundItem.FindControl("Status");
                    if (Convert.ToInt16(dataBoundItem["OrderStatusID"].Text) == 1)
                    {

                        if (e.Item.Edit)
                        {
                           Debug.Write("Edit Mode!);

                        }
                    }
                    else
                    {
                        ddlStatus.ReadOnly = true;
                    }
                }
            }
        }
    }

Thanks

[Konstantin Petkov]

Hello Twalker,

See the example's source below which illustrates how you can reference the GridDropDownColumn control (RadComboBox by default) in edit mode:

http://www.telerik.com/DEMOS/ASPNET/Prometheus/Grid/Examples/Programming/AccessingCellsAndRows/DefaultCS.aspx

Regards,
Konstantin Petkov
the Telerik team

Check out Telerik Trainer, the state of the art learning tool for Telerik products.

[Shinu]

Hi Twalker,

I am not sure whether this is what you needed. Set OrderStatusID as the DataKeyName and then depending on the datakeyvalue you can enable or disable the ComboBox in the GridDropDownColumn in the edit mode.

ASPX:

<MasterTableView AutoGenerateColumns="False" DataKeyNames="OrderStatusID" >
                    <Columns>

                        <telerik:GridDropDownColumn DataSourceID="SqlDataSource1" HeaderText="DropCol"  UniqueName="Dropcol" ListTextField="LastName" ListValueField="LastName" ></telerik:GridDropDownColumn>
                   //  ..
                    </Columns>

CS:

protected void RadGrid1_ItemDataBound(object sender, Telerik.Web.UI.GridItemEventArgs e)
    {

        if ((e.Item is GridEditFormItem) && (e.Item.IsInEditMode))
        {
            GridEditFormItem editedItem = (GridEditFormItem)e.Item;
            string strTxt = editedItem.GetDataKeyValue("OrderStatusID").ToString();
            if (strTxt =="1")
            {
                 //Access the RadCombobox here
                RadComboBox combo = (RadComboBox)editedItem["Dropcol"].Controls[0];

            }

        }

    }

Regards
Shinu.

[Elavarasan]

Hi

I have Following error on rgDynamic.Rebind(); when the line is processing its going to itemcreated event(In this event using GridDropDownListColumnEditor editor = editMan.GetColumnEditor(ColumnName) as GridDropDownListColumnEditor;
                        DropDownList ddList = new DropDownList();
                        ddList = editor.DropDownListControl; lines for assign source for Dropdown)

 

 

System.NullReferenceException was unhandled by user code
  HResult=-2147467261
  Message=Object reference not set to an instance of an object.
  Source=App_Web_sj2f5coe
  StackTrace:
       at WizardClient.rgDynamic_ItemCreated(Object sender, GridItemEventArgs e) in c:\Elavarasan\release-40\WebMaster\Common\WizardClient.aspx.cs:line 653
       at Telerik.Web.UI.RadGrid.OnItemCreated(GridItemEventArgs e)
       at Telerik.Web.UI.RadGrid.CallOnItemCreated(GridItemEventArgs e)
       at Telerik.Web.UI.GridItem.SetupItem(Boolean dataBind, Object dataItem, GridColumn[] columns, ControlCollection rows)
       at Telerik.Web.UI.GridItemBuilder.InitializeItem(Int32 dataSourceIndex, String& nextItemHierarchicalIndex, Boolean& itemIsInEditMode)
       at Telerik.Web.UI.GridItemBuilder.CreateItems(GridGroupingContext group)
       at Telerik.Web.UI.GridTableView.CreateItems(IEnumerator enumerator, GridColumn[] columns, ControlCollection controls)
       at Telerik.Web.UI.GridTableView.CreateControlHierarchy(Boolean useDataSource)
       at Telerik.Web.UI.GridTableView.CreateChildControls(IEnumerable dataSource, Boolean useDataSource)
       at System.Web.UI.WebControls.CompositeDataBoundControl.PerformDataBinding(IEnumerable data)
       at System.Web.UI.WebControls.DataBoundControl.OnDataSourceViewSelectCallback(IEnumerable data)
       at System.Web.UI.DataSourceView.Select(DataSourceSelectArguments arguments, DataSourceViewSelectCallback callback)
       at System.Web.UI.WebControls.DataBoundControl.PerformSelect()
       at Telerik.Web.UI.GridTableView.PerformSelect()
       at System.Web.UI.WebControls.BaseDataBoundControl.DataBind()
       at Telerik.Web.UI.GridTableView.DataBind()
       at Telerik.Web.UI.RadGrid.DataBind()
       at Telerik.Web.UI.RadGrid.AutoDataBind(GridRebindReason rebindReason)
       at Telerik.Web.UI.RadGrid.Rebind()
       at WizardClient.rgDynamic_PreRender(Object sender, EventArgs e) in c:\Elavarasan\release-40\WebMaster\Common\WizardClient.aspx.cs:line 550
       at System.Web.UI.Control.OnPreRender(EventArgs e)
       at System.Web.UI.WebControls.BaseDataBoundControl.OnPreRender(EventArgs e)
       at Telerik.Web.UI.RadCompositeDataBoundControl.OnPreRender(EventArgs e)
       at System.Web.UI.Control.PreRenderRecursiveInternal()
       at System.Web.UI.Control.PreRenderRecursiveInternal()
       at System.Web.UI.Control.PreRenderRecursiveInternal()
       at System.Web.UI.Control.PreRenderRecursiveInternal()
       at System.Web.UI.Control.PreRenderRecursiveInternal()
       at System.Web.UI.Control.PreRenderRecursiveInternal()
       at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
  InnerException: 

    protected void rgDynamic_PreRender(object sender, EventArgs e)
    {
        if (!rgDynamic.MasterTableView.IsItemInserted)
        {


            foreach (GridDataItem dataItem in rgDynamic.MasterTableView.Items)
            {
                //if (dataItem is GridEditableItem)
                {
                    dataItem.Edit = true;
                }
              
            }
            if (rgDynamic.MasterTableView.Items.Count > 0)
                
                rgDynamic.Rebind();
        }

}