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Automaticaly Match and Select ComboBox Item

, 2 Nov 2006
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Automaticaly Select Item From a Combox as the String is entered


This is a very simple Article. As I was working in VB I used to use a Data Combox which used to match and select the Items in it as you type in the string. I don't know whether .Net has such One. I think the default combox box dos'nt has it. So I worte this code which would that process.

The Code

Match Flag
Dim Match as Boolean
TextChanged : First we will ckeck for the match flag which is set by the key press event. If its true then We will check the entered string with the items in the list by their length. Like Taking the entered string and matching it with the item only to the length of the Enterded string ie,Chand is entered, We will match It with the Item in List ChandraSekar as Chand - Chand.If a string Matches then it will be selected in the ComboBox and a select command will be sent for the remaining length of the string selected to the entered one.
  Dim i As Short
        Dim Buffer As Short
        If Match = True Then
            For i = 0 To CmBx.Items.Count - 1
                Buffer = Len(CmBx.Text)
                If StrComp(UCase(CmBx.Text), UCase(VB.Left(CmBx.Items.Item(i), Buffer))) = 0 Then
                    CmBx.Text = CmBx.Items.Item(i)
                    System.Windows.Forms.SendKeys.Send("{left " & Len(CmBx.Text) - Buffer & "}+{End}")
                    Exit Sub
                End If
            Next i
        End If
KeyPressEvent : Here we check for the key entered. If the pressed key is DEL or BACKSPACE we set the match flag to false and send the DEL key if DEL key was pressed.
 Dim KeyCode As Short = Asc(e.KeyChar)
        If KeyCode = 8 Or KeyCode = 13 Then
            If KeyCode = 13 Then
            End If
            Match = False
            Match = True
        End If

Sample Image - ASComboBox1.JPG

Sample Image - ASComboBox2.JPG

Sample Image - ASComboBox3.JPG

Sample Image - ASComboBox4.JPG


This is a simple code. The Logic is also not too Complicated. I wrote this code because I did'nt find any feature like this in the Combo Box Control. If there is any in it or there is any other Combo Box Control Providing it please let me Know.


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About the Author

ChandraSekar Maheswaran
Web Developer
India India
Am Chandru. I'm a Software developer. Am concentrating Only on Microsoft Technologies more than others. Don't ask me why..! I usually write codes a lot.. I do them because I Like them. Am working in a software firm in India. i've done a Post Graduation in Computers.

Comments and Discussions

GeneralSuggestion on better code flow Pinmembermunnje2-Nov-06 9:16 
GeneralRe: Suggestion on better code flow PinmemberChandraSekar Maheswaran2-Nov-06 19:10 
GeneralToo many PinmemberJonathan [Darka]2-Nov-06 4:18 
GeneralRe: Too many PinmemberChandraSekar Maheswaran2-Nov-06 19:08 
GeneralRe: Too many PinmemberChandraSekar Maheswaran2-Nov-06 19:15 

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