Header checkbox | Infragistics Forums

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Header checkbox

Leonid posted over 13 years ago

Hi,

One of my grid columns having checkboxes and header checkbox allowing check/uncheck all.

For some reason when I am checking single checkbox in grid row header checkbox changing state to Indeterminate as well, anyway to prevent this?

I have following settings on this column:

Me.grd.DisplayLayout.Bands(0).Style = Infragistics.Win.UltraWinGrid.ColumnStyle.CheckBox
Me.grd.DisplayLayout.Bands(0).Header.CheckBoxSynchronization = HeaderCheckBoxSynchronization.RowsCollection
Me.grd.DisplayLayout.Bands(0).Header.CheckBoxVisibility = HeaderCheckBoxVisibility.Always

Thanks!

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Verified Answer
Offline Christopher Shea posted over 13 years ago
Hello,

When the HeaderCheckBoxSynchronization is set to Band or RowsCollection, the Cell values and header checkbox will always be kept synchronized. Therefore, changing the value of one of the affected cells, will change its header checkbox.

To achieve the desired results, you'll have to handle the synchronization yourself.

First you'll have to change the CheckBoxSynchronization of the appropriate column to HeaderCheckBoxSynchronization.None.

Me.grd.DisplayLayout.Bands(0).Columns(0).Header.CheckBoxSynchronization = HeaderCheckBoxSynchronization.None

Now you'll need to make sure the values of the cells are changed whenever the checkbox is clicked. This can be done by handling the AfterHeaderCheckStateChanged event, and setting the value for each row in e.Rows.

Private Sub grd_AfterHeaderCheckStateChanged(ByVal sender As System.Object, ByVal e As Infragistics.Win.UltraWinGrid.AfterHeaderCheckStateChangedEventArgs) Handles grd.AfterHeaderCheckStateChanged Dim column As UltraGridColumn = e.Column Dim rows As RowsCollection = e.Rows Dim checkStateValue = column.GetHeaderCheckedState(rows) For Each row In rows row.Cells(column).Value = checkStateValue Next End Sub

This should help you achieve your desired functionality. Let me know if I can be of further assistance.

Thanks,

Chris
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ananda posted over 12 years ago in reply to Christopher Shea

Hi Chris,

I followed your code and its working fine.. but the problem i am facing is when i check the header to true , all the rows are checked and vice versa.. but once i check the header true and manually uncheck any of the rows, it wont change the header to uncheck,

Please help me ... thanks in advance
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Suggested Answer
Ganesh posted over 12 years ago in reply to Christopher Shea

For first click on header checkbox it is not working.
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Offline Christopher Shea posted over 12 years ago in reply to ananda

Since you've turned off the automatic synchronization in order to produce your own customized synchronization, you will need to handle synchronizing the header checkbox to match the cell values.

Assuming you want the header checkbox to be unchecked (except when all cell in the column are checked), you will want to code similar to the following in the CellChanged or AfterCellUpdate event handler:

    Private Sub grd_CellChange(ByVal sender As System.Object, ByVal e As Infragistics.Win.UltraWinGrid.CellEventArgs) Handles grd.CellChange
        Dim originalInCellChange = Me.inCellChange
        Me.inCellChange = True
        Try
            Dim cell As UltraGridCell = e.Cell
            Dim column As UltraGridColumn = cell.Column
            Dim rows As RowsCollection = cell.Row.ParentCollection
            Dim newCellValue As Boolean = cell.EditorResolved.Value

            Dim currentHeaderCheckState As CheckState = column.GetHeaderCheckedState(rows)
            If newCellValue Then
                If Not (currentHeaderCheckState = CheckState.Checked) Then
                    ' the header is not checked but the new cell value is true
                    ' so we need to loop through all the rows (assuming that we want to synchronize based on the rows collection)
                    ' to determine if we need to check the header
                    Dim shouldCheckHeader As Boolean = True
                    For Each row In rows
                        Dim cellInRow = row.Cells(column)
                        If cell IsNot cellInRow AndAlso cellInRow.Value = False Then
                            shouldCheckHeader = False
                            Exit For
                        End If
                    Next
                    If (shouldCheckHeader) Then
                        column.SetHeaderCheckedState(rows, True)
                    End If
                End If
            ElseIf currentHeaderCheckState = CheckState.Checked Then
                ' the header is checked but the new cell value is false,
                ' so turn off the header
                column.SetHeaderCheckedState(rows, False)
            End If
        Finally
            Me.inCellChange = originalInCellChange
        End Try
    End Sub

Additionally, you will want to add a recursion flag at the start of the AfterHeaderCheckStateChanged event handler, to prevent the SetHeaderCheckedState() in CellChanged from triggering all the cell to be set to False/Unchecked.

        If (Me.inCellChange) Then
            Return
        End If

Let me know if you require any further assistance with this.

Thanks,

Chris