Access RadComboBox from GridTemplateColumn

[Najid Hanif]

I can't seem to figure out how to get the selected value or text from a RadComboBox in a GridTemplateColumn. Actually seems like I can't find the control at all.  The edit Form is a popup. The grid is in a user control. 

Here is my column 

<telerik:GridTemplateColumn UniqueName="ProdWorkstation" HeaderText="ProdWorkstation">
    <ItemTemplate>
    <%#DataBinder.Eval(Container.DataItem, "ProdWorkstation")%>
    </ItemTemplate>
    <EditItemTemplate>
        <telerik:RadComboBox runat="server" ID="RadComboBox_SelectWorkStation" Height="300px" Width="750px" DataSourceID="LCM_UserWorkstationList" EnableLoadOnDemand="true"
        ItemsPerRequest="20" EnableAutomaticLoadOnDemand="False" DataTextField="Workstation" DataValueField="Workstation"
        style="margin-bottom: 0px" AutoPostBack="True" HighlightTemplatedItems="true" CausesValidation="False" Skin="Office2007"
         OnItemsRequested="RadComboBox1_ItemsRequested">

            <HeaderTemplate>
                <ul>
                    <li class="col75">user_id</li>
                    <li class="col200">Workstation</li>
                    <li class="col200">Name</li>
                    <li class="col200">Profile</li>
                </ul>
            </HeaderTemplate>
            <ItemTemplate>
                <ul>
                    <li class="col75"><%# DataBinder.Eval(Container.DataItem, "user_id")%></li>
                    <li class="col200"><%# DataBinder.Eval(Container.DataItem, "Workstation")%></li>
                    <li class="col200"><%# DataBinder.Eval(Container.DataItem, "Name") %></li>
                    <li class="col200"><%# DataBinder.Eval(Container.DataItem, "Profile")%></li>
                </ul>
            </ItemTemplate>
        </telerik:RadComboBox>
    </EditItemTemplate>
</telerik:GridTemplateColumn>

Here is the codebehind where I try and get the text:

if (e.CommandName == "PerformInsert")
            {
                GridEditFormInsertItem EditForm = (GridEditFormInsertItem)e.Item;
                RadComboBox combo = EditForm["ProdWorkstation"].Controls[0] as RadComboBox;
                string ProdWorkstation = combo.Text; //NULL value

How can I do this?

Thanks!

[Shinu]

Hello,

Try accessing the combobox as shown below.
C#:

protected void RadGrid1_ItemCommand(object sender, Telerik.Web.UI.GridCommandEventArgs e)
{
 if (e.CommandName == "PerformInsert")
 {
   GridEditFormInsertItem item = (GridEditFormInsertItem)e.Item;
   RadComboBox combo = (RadComboBox)item.FindControl("ProdWorkstation");
 }
}

Thanks,
Shinu.

[Najid Hanif]

Thanks but unfortunately I still get the same error: Object reference not set to an instance of an object.

Any other ideas?

Thanks

 

[Jayesh Goyani]

Hello,

protected void RadGrid1_ItemCommand(object sender, Telerik.Web.UI.GridCommandEventArgs e)
    {
        if (e.CommandName == RadGrid.PerformInsertCommandName)
        {
            GridEditFormInsertItem item = (GridEditFormInsertItem)e.Item;
            // If you get item is null then use GridEditableItem inplace of GridEditFormInsertItem
            RadComboBox combo = (RadComboBox)item.FindControl("RadComboBox_SelectWorkStation");
            //OR
            RadComboBox combo = (RadComboBox)item["ProdWorkstation"].FindControl("RadComboBox_SelectWorkStation");
        }
    }

Thanks,
Jayesh Goyani

[Najid Hanif]

Jayesh, Getting closer! Big thanks for getting me this far. I really appreciate it. Both of those work and the control is found but the .SelectedValue and .Text are NULL

RadComboBox combo = (RadComboBox)EditForm["ProdWorkstation"].FindControl("RadComboBox_SelectWorkStation");
 string ProdWorkstation = combo.Text; // return value is NULL 

Thanks

[Andrey]

Hi,

You get the Null value because when you are using ItemTemplate there is not value property specified for the items in the combobox. The Text property is inherited from the WebControl class and it is not overridden and that is why it returns Null.

In order to achieve your goal you could use the following approach:

protected void RadGrid1_ItemCommand(object sender, Telerik.Web.UI.GridCommandEventArgs e)
    {
        if (e.CommandName == RadGrid.PerformInsertCommandName)
        {
            GridEditFormInsertItem EditForm = (GridEditFormInsertItem)e.Item;
            RadComboBox combo = (RadComboBox)EditForm["ProdWorkstation"].FindControl("RadComboBox_SelectWorkStation");
            string ProdWorkstation = combo.SelectedItem.Text;
        }
    }

Give this approach a try and let me know if you need further assistance.

Regards,
Andrey
the Telerik team

[Najid Hanif]

Hi Andrey, I get a NullReferenceException  on  string ProdWorkstation = combo.SelectedItem.Text;

Any other ideas?

Thanks

[Jayesh Goyani]

Hello,

Please check below demo its working correctly on my side.

<telerik:RadGrid ID="RadGrid1" runat="server" AutoGenerateColumns="false" OnItemDataBound="RadGrid1_ItemDataBound"
           OnNeedDataSource="RadGrid1_NeedDataSource"
           oninsertcommand="RadGrid1_InsertCommand">
           <MasterTableView DataKeyNames="ID,Name" ClientDataKeyNames="ID,Name" CommandItemDisplay="Top"  EditMode="EditForms">
               <Columns>
                   <telerik:GridTemplateColumn UniqueName="ProdWorkstation" HeaderText="ProdWorkstation">
                       <ItemTemplate>
                           <%#DataBinder.Eval(Container.DataItem, "Name")%>
                       </ItemTemplate>
                       <EditItemTemplate>
                           <telerik:RadComboBox runat="server" ID="RadComboBox_SelectWorkStation" Height="300px"
                               Width="750px" DataSourceID="SqlDataSource1" EnableLoadOnDemand="true" ItemsPerRequest="20"
                               EnableAutomaticLoadOnDemand="False" DataTextField="Name" DataValueField="ID"
                               AutoPostBack="True" HighlightTemplatedItems="true" CausesValidation="False" Skin="Office2007"
                               OnItemsRequested="RadComboBox1_ItemsRequested">
                               <HeaderTemplate>
                                   Name
                               </HeaderTemplate>
                               <ItemTemplate>
                                   <%# DataBinder.Eval(Container.DataItem, "Name") %></li>
                               </ItemTemplate>
                           </telerik:RadComboBox>
                       </EditItemTemplate>
                   </telerik:GridTemplateColumn>
                   <telerik:GridEditCommandColumn>
                   </telerik:GridEditCommandColumn>
               </Columns>
           </MasterTableView>
       </telerik:RadGrid>
       <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:TelerikTestDataBaseConnectionString %>"
           SelectCommand="SELECT [ID], [Name] FROM [TelerikTable1]"></asp:SqlDataSource>

protected void RadGrid1_InsertCommand(object sender, GridCommandEventArgs e)
        {
            GridEditFormInsertItem item = (GridEditFormInsertItem)e.Item;
            // If you get item is null then use GridEditableItem inplace of GridEditFormInsertItem
            RadComboBox combo = (RadComboBox)item.FindControl("RadComboBox_SelectWorkStation");

            string strSelectedText;

            if (combo.SelectedItem != null)
            {
                strSelectedText = combo.SelectedItem.Text;
            }
            else
            {
                strSelectedText = combo.Text;
            }
        }

 protected void RadComboBox1_ItemsRequested(object sender, RadComboBoxItemsRequestedEventArgs e)
        {

        }


  protected void RadGrid1_NeedDataSource(object sender, GridNeedDataSourceEventArgs e)
        {
            dynamic data = new[] {
              new { ID = 1, Name ="name1"},
              new { ID = 2, Name = "name2"},
              new { ID = 3, Name = "name3"},
              new { ID = 4, Name = "Name4"},
               new { ID = 5, Name ="name5"}
            };
            RadGrid1.DataSource = data;
        }

Thanks,
Jayesh Goyani