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Managing the addition of new rows to a DataGrid

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David
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David asked on 26 Jan 2018, 03:11 PM

I am trying to handle the addition of new rows to a DataGrid by providing the user with an "Add" button. This calls the following simple code, which is intended to add a new row to the ItemSource, Select it, and then BeginEdit on it:

ViewModel.AddReportDue();
ReportsDueGrid.ScrollItemIntoView(ViewModel.SelectedReportDue);
ReportsDueGrid.SelectItem(ViewModel.SelectedReportDue);
ReportsDueGrid.BeginEdit(ReportsDueGrid.SelectedItem);

This works up to a point and I have ensured via the debugger that the SelectedItem in the last statement is indeed the row I have just added, but the BeginEdit always starts at the second row of the grid (see image). I have also tried to BeginEdit on the first item in the underlying collection, again with the same result. Does anyone know of a way of forcing the BeginEdit to target the correct row after the new row is added?

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Nasko
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answered on 30 Jan 2018, 09:47 AM
Hello David,

The observed by you behavior could be considered as an expected one. Basically, after adding new item to the DataGrid the control itself needs some time to rearrange and measure. Because of that trying to edit the item so soon after adding it could cause unexpected behavior. What we could suggest you is to use the "scrollCompleteAction" of the ScrollItemIntoView method and inside ti to invoke the BeginEdit method - thus it will be sure that the added item is arrange and present in the DataGrid.

Please, check the attached sample that demonstrates the described above approach.

Hope this helps.

Regards,
Nasko
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David
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answered on 30 Jan 2018, 10:08 AM

Thanks. That is really helpful, and is much appreciated.

David

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David
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