Question

Autocomplete Combobox

Asked by: tgrambo

I would like to know if its possible in a .NET Windows form to create a combo box that would act like the IE address combo box.

When I type in the combo box it would find the nearest value and fill in the combo box with that text but still allow me to continue typing if I want to find a value that isn't the first match.

Example:

New York Knicks
New York Mets
New York Yankees

If I typed "New" it would find the Knicks and fill in my combo box with "New York Knicks" but would allow me to keep typing cause the value I do want is the "New York Yankees", once I tab off the control it will select the value that is the closest match.

A bonus would be once the user starts typing the drop down list displays the values. Is this possible? I hope that makes some sense.

Thank you.

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Asked On
2005-07-13 at 15:02:46ID21490703
Tags

autocomplete

,

combobox

Topic

C# Programming Language

Participating Experts
2
Points
125
Comments
2

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Answers

 

by: pcarrierPosted on 2005-07-13 at 15:11:39ID: 14436234

 

by: eternal_21Posted on 2005-07-13 at 21:55:07ID: 14437924

Use this for your ComboBox's KeyPress event:

    protected void ComboBox_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
    {
      ComboBox comboBox = (ComboBox)sender;

      if(Char.IsControl(e.KeyChar))
        return;

      string ToFind = comboBox.Text.Substring(0, comboBox.SelectionStart) + e.KeyChar;
      int Index = comboBox.FindStringExact(ToFind);

      if(Index==-1)
        Index = comboBox.FindString(ToFind);

      if(Index==-1)
        return;

      comboBox.SelectedIndex = Index;
      comboBox.SelectionStart = ToFind.Length;
      comboBox.SelectionLength = comboBox.Text.Length - comboBox.SelectionStart;

      e.Handled = true;
    }

20120131-EE-VQP-002

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