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Skystone Software
http://www.SkystoneSoftware.comScott Waletzko's Blog
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Updating ComboBox Items by Typing
Published: 11/3/2008 |
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There was an interesting request over on the VBCity Forums asking how to update the selected item in a ComboBox by typing the change in the text area of the control. The problem is that the control changes selection of the drop-down (to -1) when you type something that isn't in the list. Working around that is as easy as keeping track of the last selected item in the SelectedIndexChanged event. Here's an example:
VB:
Public Class Form1
Private lastSelectedItemIndex As Integer = -1
Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged
lastSelectedItemIndex = ComboBox1.SelectedIndex
End Sub
Private Sub ComboBox1_TextUpdate(ByVal sender As Object, ByVal e As System.EventArgs) Handles ComboBox1.TextUpdate
If (lastSelectedItemIndex > -1) Then
' get cursor position...
Dim i As Integer = Me.ComboBox1.SelectionStart
' update selected item...
ComboBox1.Items(lastSelectedItemIndex) = ComboBox1.Text
' reset cursor position because it gets screwed up when you change selection...
Me.ComboBox1.SelectionStart = i + 1
End If
End Sub
End Class
public class Form1
{
private int lastSelectedItemIndex = -1;
private void ComboBox1_SelectedIndexChanged(object sender, System.EventArgs e)
{
lastSelectedItemIndex = ComboBox1.SelectedIndex;
}
private void ComboBox1_TextUpdate(object sender, System.EventArgs e)
{
if (lastSelectedItemIndex > -1)
{
// get cursor position...
int i = this.ComboBox1.SelectionStart;
// update selected item...
ComboBox1.Items[lastSelectedItemIndex] = ComboBox1.Text;
// reset cursor position because it gets screwed up when you change selection...
this.ComboBox1.SelectionStart = i + 1;
}
}
}
Questions or Comments? .
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