How to display the selected item at the top of the dropdown?

1 min read

In order to display the highlighted choice at top of the drop down, CurrentCellKeyPress event and TextChanged event of GridComboBoxCellRenderer’s TextBox can be used. The top row index of the drop down list as the selected index can be set in the TextChanged event.

Code Snippet

//Triggering the CurrentCellKeyPress event.
 
this.gridDataBoundGrid1.CurrentCellKeyPress += new KeyPressEventHandler(gridDataBoundGrid1_CurrentCellKeyPress);
 
private GridComboBoxCellRenderer renderer;
 
//Handling the CurrentCellKeyPress event.
 
private void gridDataBoundGrid1_CurrentCellKeyPress(object sender, KeyPressEventArgs e)
{
   renderer = this.gridDataBoundGrid1.Model.CurrentCellRenderer as GridComboBoxCellRenderer;
   if (renderer != null)
   {
      renderer.TextBox.TextChanged += new System.EventHandler(TextBox_TextChanged);
   }
}
private void TextBox_TextChanged(object sender, EventArgs e)
{
    if (this.gridDataBoundGrid1.CurrentCell.IsDroppedDown && renderer.ListBoxPart.SelectedItem != null)
    {
       //Move the selected value to the top of the drop down
       renderer.ListBoxPart.TopIndex = renderer.ListBoxPart.SelectedIndex;
    }
}

' Triggering the CurrentCellKeyPress event.
 
AddHandler Me.gridDataBoundGrid1.CurrentCellKeyPress, AddressOfgridDataBoundGrid1_CurrentCellKeyPress
 
Private renderer As GridComboBoxCellRenderer
' Handling the CurrentCellKeyPress event.
 
Private Sub gridDataBoundGrid1_CurrentCellKeyPress(ByVal sender As Object, ByVal e AsKeyPressEventArgs)
   renderer = TryCast(Me.gridDataBoundGrid1.Model.CurrentCellRenderer,GridComboBoxCellRenderer)
   If renderer IsNot Nothing Then
       AddHandler renderer.TextBox.TextChanged, AddressOf TextBox_TextChanged
   End If
End SubPrivate Sub TextBox_TextChanged(ByVal sender As Object, ByVal e As EventArgs)
    If Me.gridDataBoundGrid1.CurrentCell.IsDroppedDown AndAlsorenderer.ListBoxPart.SelectedItem IsNot Nothing Then
        'Move the selected value to the top of the drop down
         renderer.ListBoxPart.TopIndex = renderer.ListBoxPart.SelectedIndex;
    End IfEnd Sub

$E:\KB tasks\2016Mar_2nd sprint\WF-24262\image.PNG$

Sample Links

C#: Highlight at Top_CS

VB: Highlight at Top_VB

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How to display the selected item at the top of the dropdown?

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