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help on combobox

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Started by Gz1987, Mar 17 2008 09:51 PM

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4 replies to this topic

#1
Gz1987
Posted 17 March 2008 - 09:51 PM

Gz1987

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My question is: How do you prevent the user from entering the same data to the combobox? I know you need a do loop and an if statement. but tried to do that for awhile and only little luck. I will post my code below. The code works sometimes, but i think there must be some logic error within.

    If cboCar.Text <> cboCar.List(cboCar.ListIndex) Then

        

        Do

            cboCar.AddItem cboCar.Text

            ''Add to combo box

            

        Loop Until cboCar.Text <> cboCar.List(cboCar.ListIndex)


    Else


            MsgBox "Already There"

            ''Display Textbox if it's in the combo box already

    End If

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#2
Guest_Jordan_*
Posted 18 March 2008 - 12:32 PM

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Your loop is wrong. You are saying:

Index1 = this
Index2 = that

cboCar.Text = that

Loop starts at index1. cbCar.Text does not equal Index1. Loop ends. Loop stops at index1. You see, you are never making it to index2 or beyond. Use a do for or while loop with a counter. Cycle through every index until the end. If no matches were found, add the item.

You can also use a search function, if it returns false then insert the word:
Progressive Search Using a Combobox in VB.NET 2005

#3
Gz1987
Posted 18 March 2008 - 10:13 PM

Gz1987

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Thank you, i know what i am doing wrong now. but i ran into another trouble spot. for the "For loop" i know i am suppose to loop through the list, but i cannot seem to find the right property for it. is it ".ListIndex", ".List"

#4
Guest_Jordan_*
Posted 19 March 2008 - 04:43 AM

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I'm not sure I understand what you are asking. The total number of entries in the combobox would be ".ListCount". The ListIndex is the currently selected item.

Here is a sample for loop:

For i = 0 To cboCar.ListCount Step 1
   if cboCar.Text <> cboCar.List(cboCar.ListIndex) Then
           ' Entry already in list
   End If
Next i

I didn't test or execute this code so there could be errors.

#5
dakrwind123
Posted 29 March 2008 - 04:41 PM

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ohh it all makes sense
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