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[Solved] GridCheckboxColumn - How to Bind NUMBER 0 and 1 value?

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Grid

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

11 Answers, 1 is accepted

answered on 13 May 2009, 04:56 AM

Hi Maxim,

GridCheckBoxColumn will accept only boolean value. But you can achieve the desired scenario using a GridTemplateColumn with a CheckBox in its ItemTemplate. Give a try with the following approach and whether it is working.

ASPX:

    
              <telerik:GridTemplateColumn UniqueName="CheckCol" DataField="TestField" HeaderText="CheckCol" > 
        
                        <ItemTemplate> 
        
                            <asp:CheckBox ID="CheckBox1" runat="server" Checked='<%# DataBinder.Eval (Container.DataItem,"TestField").ToString()!="0"?true:false %>' /> 
        
                        </ItemTemplate> 
        
                      </telerik:GridTemplateColumn>

Regards
Shinu

answered on 13 May 2009, 09:57 AM

Hello Maxim,

Unfortunately this is not possible and to keep the viewstate/lifecycle of the grid consistent when having programmatically created template columns, you need to build the control inside the OnInit handler.

An alternative solution for your case might be to determine the columns and their type based on the value from another control on the page as illustrated in this documentation topic.

Kind regards,
Sebastian
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answered on 13 May 2009, 10:24 AM

Sebastian, I have found solution.

GridCheckboxColum is using private method OnDataBindColumn for binding data into checkbox control. This method is hooked inside public method InitializeCell. So, in generall I can't make an access to binding method. I can't understand for why binding method has a private attribute? Possible it is nessesary for some internal features of RadGrid architecture. But in generall I can't use GridCheckbox column if I am using Oracle database. So, please think about make binding method protected in future versions.

Here is my solution of How to Bind 0 and 1 Number values into GridCheckBoxColumn

1. Create custom CustomGridCheckBoxColumn which is iherrited from GridCheckBoxColumn

2. Create custom binding handler: OnDataBindColumnEx()

3. Override GridCheckBoxColumn.InitializeCell method:

    
             {
    base.InitializeCell(cell, columnIndex, inItem);      
 
                if (inItem.IsDataBound)
 
                {
 
                   //Remove standard binding Handler
       EventInfo eventInfo = inItem.GetType().GetEvent("CellDataBound");
 
                   Type tDelegate = eventInfo.EventHandlerType;
 
                   MethodInfo dataBindBaseMehtod = GetType().BaseType.GetMethod  ("OnDataBindColumn", BindingFlags.NonPublic | BindingFlags.Instance);
 
                   Delegate d = Delegate.CreateDelegate(tDelegate, this, dataBindBaseMehtod);
 
                   eventInfo.RemoveEventHandler(inItem, d);
 
                   //Set new custom Handler
 
                   inItem.CellDataBound += new GridCellDataBoundEvent (this.OnDataBindColumnEx);
 
                 }
}