Selective expansion of rows involving hierarchical data

[Mark Nalevanko]

Hello,

I am testing out the RadGridView control and noticed when setting up a relationship for hierarchical data display in the control that once I add a row programmatically to the child template's data source that all rows on the main/parent template will expand out when clicking on the + icon for the row even though not all rows have any linked child rows. For my purposes, I would like to disallow the expanding of rows if there's nothing to show as in many cases there will only be a few (if any) rows with child rows linked up. Is this possible? Is there an event I should cancel? Or a way to disable/make invisible the + icon for rows that have no child rows?

Thanks,
Mark

[Jack]

Hi Mark Nalevanko,

Please take a look at the following KB article. It describes how to hide the expand/collapse image when it is not needed. You can also disable the expansion of a child view by handling ChildViewExpanding event:

void radGridView1_ChildViewExpanding(object sender, ChildViewExpandingEventArgs e)
{
    GridViewRowInfo[] rows = e.CellElement.RowInfo.ViewTemplate.ChildGridViewTemplates[0].GetChildRows(e.CellElement.RowInfo);
    e.Cancel = rows == null || rows.Length == 0;
}

I hope this helps.

Best wishes,
Jack
the Telerik team

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