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Expand Single Group

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GridView
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Brandon Zeider
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Brandon Zeider asked on 26 Aug 2009, 07:54 PM
I have a grid with multiple group descriptors - how do I expand just one of those groups? I see the ExpandGroup method, but do not understand how to implement.

Thanks.

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Milan
Telerik team
answered on 27 Aug 2009, 06:52 AM
Hello Brandon Zeider,

With a version prior to Q2 2009 you can expand a group by setting the IsExpanded property to true of any GroupRecord or GridViewGroupRow.

((GroupRecord)this.RadGridView1.Records[0]).IsExpanded = true

When RadGridView is grouped the Records collection will contain GroupRecords that correspond to the groups that you see on the grid itself. You can get any of the groups and set IsExpanded to true to expand it.

After Q2 2009 SP1 you could still use this approach or use the ExpandMethod that you have mentioned.

// required namespace System.Linq  
this.RadGridView1.ExpandGroup(this.RadGridView1.Items.OfType<IGroup>().ElementAt(0)); 

The ExpandGroup method expects an argument of type IGroup which is an Interface of our new data engine and will supercede the GroupRecord sometime in the future. Unofrtunately at the moment it is not straighforward to access the collection of IGroups and some Linq extension methods have to be used to get to a specific IGroup. The code above will get the first IGroup (similar to GroupRecord).

We are currently improving our API so that it will be easier to use the ExpandGroup method.

Hope this helps.

Greetings,
Milan
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Anand
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answered on 19 Apr 2011, 09:01 AM

Hi,

I want to do Expand Single Group .How to do that?

Thanks,
Anand
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Vlad
Telerik team
answered on 19 Apr 2011, 09:03 AM
Hi,

 You can use ExpandGroup() method of the grid to achieve your goal. 

All the best,
Vlad
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Anand
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answered on 19 Apr 2011, 09:07 AM
Hi,

Is there any property like Expand Mode "Single" for the group

Thanks,
Anand
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Maya
Telerik team
answered on 19 Apr 2011, 10:37 AM
Hello Anand,

If you want to expand a particular group, you may use the ExpandGroup() method of the grid. In case you require only a single group to be expanded at a time, you may benefit from the approach demonstrated in thisblog post. However, your implementation may be similar to:

GridViewGroupRow lastExpandedGroupRow;
        void clubsGrid_GroupRowIsExpandedChanging(object sender, Telerik.Windows.Controls.GridView.GroupRowCancelEventArgs e)
        {
            if((e.Row as GridViewGroupRow).IsExpanded == true)
            {
                if(lastExpandedGroupRow != null)
                {
                    lastExpandedGroupRow.IsExpanded = false;
                }
                lastExpandedGroupRow = e.Row as GridViewGroupRow;
            }          
        }

 

All the best,
Maya
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GridView
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Brandon Zeider
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Milan
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Anand
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Vlad
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Maya
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