Accessing Checkbox in GroupHeader not working

[Torsten]

Hi,

I am facing another Problem with RadGrid:

I have grouped my data and added a checkbox to the groupheader with this code:

protected void rtl_ItemDataBound(object sender, GridItemEventArgs e)
        {
            if (e.Item is GridGroupHeaderItem)
            {
                GridGroupHeaderItem item = (GridGroupHeaderItem)e.Item;
                DataRowView groupDataRow = (DataRowView)e.Item.DataItem;

                CheckBox chk = new CheckBox();
                item.DataCell.Controls.Add(chk);
            }
}

This is working. Every groupheader contains a checkbox.

After a postback, I want to get the state of this checkbox:

foreach (GridGroupHeaderItem headerItem in rtl.MasterTableView.GetItems(GridItemType.GroupHeader))
                {

                        CheckBox chkbx = (CheckBox)headerItem.DataCell.Controls[0];
                }

But now,  the controls collection of the headeritem.DataCell is empty. What is wrong here?

[JSJ]

Hi Torseton,

When you add a control in the RadGrid's ItemDataBound event, the control does not persist on postback. So try adding the control on the ItemCreated event of RadGrid so that the control persists after a postback.

[Shinu]

Hello,

One suggestion is to create the GroupHeader control  in both ItemCreated and ItemDataBound event. Here is sample code.

C#:

protected void rtl_ItemCreated(object sender, GridItemEventArgs e)
    {
         if (e.Item is GridGroupHeaderItem)
            {
                GridGroupHeaderItem item = (GridGroupHeaderItem)e.Item;
                CheckBox chk = new CheckBox();
                item.DataCell.Controls.Add(chk);
            }
    }
protected void rtl_ItemDataBound(object sender, GridItemEventArgs e)
        {
            if (e.Item is GridGroupHeaderItem)
            {
                GridGroupHeaderItem item = (GridGroupHeaderItem)e.Item;
                CheckBox chk = new CheckBox();
                item.DataCell.Controls.Add(chk);
            }
        }

-Shinu.

[Torsten]

Thanks for suggestions, but it is still not working. I used your code and now the collection isn`t empty any more.

But:

The checkbox-state is always false. So it isn`t working for me.

[Pavlina]

Hello Torsten,

You may consider using the example from this code library thread and see if it helps:
http://www.telerik.com/community/code-library/aspnet-ajax/grid/selecting-all-items-in-a-group-with-a-checkbox-in-the-group-header-item.aspx

Greetings,
Pavlina
the Telerik team

[Torsten]

Hi have already implemented a function to select/deselect all members of a group. This works fine for me.

But:

I want to save either the groupname or the groupmembers if only some members are selected.

Let me explain:

I have A, B, C, D as values. A and B are members of Group G1, C and D are in G2.

The user has now the possibility to select A and B or the whole group G1. The whole group means: if C or D will go to group G1, they are selected too, otherwise not.

So it is important to get the state of the checkbox.

[Pavlina]

Hi Torsten,

Based on the supplied information, it is hard to determine what is causing this unwanted behavior. If the issue persists, you can open a formal support ticket, and send us a small working project, demonstrating your setup, and showing the unwanted behavior. We will debug it locally, and advise you further.

Greetings,
Pavlina
the Telerik team