Help: Radgrid detail table disappears when editing

[Gábor]

Hi!

Here is the problem: I have a radgrid with detailtable(partners and contracts).
I want to edit a contract using Editform. Every time something causes a pageload(fe: click a button on the edit form) all the contracts of the partner disappear. The edit form disappears too. There is no message like "No child records to display", all I can see is an empty row.
 The Page_Load method contains the calling of the databind method of the grid.

I think this is a common and simple problem, so I wont copy my code here.
Sorry for my bad English.

[Jayesh Goyani]

Hello,

Please check code snippet/demo.

<telerik:RadGrid ID="RadGrid1" runat="server" AutoGenerateColumns="false"
           OnNeedDataSource="RadGrid1_NeedDataSource"
OnDetailTableDataBind="RadGrid1_DetailTableDataBind">
           <MasterTableView DataKeyNames="ID,Name" CommandItemDisplay="Top">
               <Columns>
                   <telerik:GridBoundColumn DataField="ID" UniqueName="ID" HeaderText="ID">
                   </telerik:GridBoundColumn>
                   <telerik:GridBoundColumn DataField="Name" UniqueName="Name" HeaderText="Name">
                   </telerik:GridBoundColumn>
                   <telerik:GridEditCommandColumn>
                   </telerik:GridEditCommandColumn>
               </Columns>
               <DetailTables>
                   <telerik:GridTableView>
                       <Columns>
                           <telerik:GridBoundColumn DataField="CID" UniqueName="CID" HeaderText="CID">
                           </telerik:GridBoundColumn>
                           <telerik:GridBoundColumn DataField="Name" UniqueName="Name" HeaderText="Name">
                           </telerik:GridBoundColumn>
                           <telerik:GridEditCommandColumn>
                           </telerik:GridEditCommandColumn>
                       </Columns>
                   </telerik:GridTableView>
               </DetailTables>
           </MasterTableView>
       </telerik:RadGrid>

protected void RadGrid1_NeedDataSource(object sender, GridNeedDataSourceEventArgs e)
        {
            // Bind parent grid
            dynamic data = new[] {
              new { ID = 1, Name ="Parent"},
              new { ID = 2, Name = "Parent"},
              new { ID = 3, Name = "Parent"},
              new { ID = 4, Name = "Parent"},
              new { ID = 5, Name ="Parent"}
            };
            RadGrid1.DataSource = data;
        }


protected void RadGrid1_DetailTableDataBind(object sender, GridDetailTableDataBindEventArgs e)
        {
            string strId = (e.DetailTableView.ParentItem as GridDataItem).GetDataKeyValue("ID").ToString();
            dynamic data = new[] {
              new { CID = 1, Name ="Child"+strId},
              new { CID = 2, Name = "Child"+strId},
              new { CID = 3, Name = "Child"+strId},
              new { CID = 4, Name = "Child"+strId},
              new { CID = 5, Name ="Child"+strId}
            };
            e.DetailTableView.DataSource = data;

        }

Thanks,
Jayesh Goyani

[Gábor]

This is how to make a simple grid with detail table, but not the answer to my question.

[Jayesh Goyani]

Hello,

Please create new page and try with above code snippet.

you can get your answer/result in it.

Thanks,
Jayesh Goyani

[Gábor]

OK, I will.

Please check this topic one hour later, I will post the results.

[Gábor]

OK I tried it, but still not understand why my records disappear. Please tell me the reason.

[Jayesh Goyani]

Hello,

I am binding records by below event.

Parent Grid="RadGrid1_NeedDataSource"
Child Grid="RadGrid1_DetailTableDataBind"

you are trying to bind your grid in page_load, or your own way so...

Thanks,
Jayesh Goyani

[Gábor]

I changed it to your way and killed all the bindings in the Page_Load before I said I tried it.
Still doesn't work. :(

[Gábor]

UP!