ComboBox SelectionChangeCommitted event fires twice

[docw@globetrotter.net]

SelectionChange Committed event fires twice

Hi,

Please have a look at the following ComboBox behavior.
With the code below, if you click in the dropdown list with the mouse
to select an item , everything is fine.

But if you use the Enter key to select in the dropdown list, the
SelectionChange Committed event is fired twice.

How can I cancel the second event firing ?

Thanks
ML
'#### BEGIN CODE ############### ###

Private Sub FormTest_Load(B yVal sender As System.Object, ByVal e As
System.EventArg s) Handles MyBase.Load
ComboBox1.DropD ownStyle = ComboBoxStyle.D ropDownList

ComboBox1.Items .Add("My item 1")
ComboBox1.Items .Add("My item 2")
ComboBox1.Items .Add("My item 3")
End Sub

Private Sub ComboBox1_Selec tionChangeCommi tted(ByVal sender As
Object, ByVal e As System.EventArg s) Handles
ComboBox1.Selec tionChangeCommi tted

MsgBox("test")

End Sub

'#### END CODE ############### ###

[tommaso.gastaldi@uniroma1.it]

Re: ComboBox SelectionChange Committed event fires twice

Hi ML,
I have tested it with VS2005. This code does not show the problem you
report (?).

-tom

docw@globetrott er.net ha scritto:

SelectionChange Committed event fires twice
>
Hi,
>
Please have a look at the following ComboBox behavior.
With the code below, if you click in the dropdown list with the mouse
to select an item , everything is fine.
>
But if you use the Enter key to select in the dropdown list, the
SelectionChange Committed event is fired twice.
>
How can I cancel the second event firing ?
>
Thanks
ML
'#### BEGIN CODE ############### ###
>
Private Sub FormTest_Load(B yVal sender As System.Object, ByVal e As
System.EventArg s) Handles MyBase.Load
ComboBox1.DropD ownStyle = ComboBoxStyle.D ropDownList
>
ComboBox1.Items .Add("My item 1")
ComboBox1.Items .Add("My item 2")
ComboBox1.Items .Add("My item 3")
End Sub
>
Private Sub ComboBox1_Selec tionChangeCommi tted(ByVal sender As
Object, ByVal e As System.EventArg s) Handles
ComboBox1.Selec tionChangeCommi tted
>
MsgBox("test")
>
End Sub
>
'#### END CODE ############### ###

[Mic]

Re: ComboBox SelectionChange Committed event fires twice

Hi Tom,

Sorry I did not specify that I'm using VS .Net 2003.


tommaso.gastald i@uniroma1.it wrote:

Hi ML,
I have tested it with VS2005. This code does not show the problem you
report (?).
>
-tom
>
docw@globetrott er.net ha scritto:
>

SelectionChange Committed event fires twice

Hi,

Please have a look at the following ComboBox behavior.
With the code below, if you click in the dropdown list with the mouse
to select an item , everything is fine.

But if you use the Enter key to select in the dropdown list, the
SelectionChange Committed event is fired twice.

How can I cancel the second event firing ?

Thanks
ML
'#### BEGIN CODE ############### ###

Private Sub FormTest_Load(B yVal sender As System.Object, ByVal e As
System.EventArg s) Handles MyBase.Load
ComboBox1.DropD ownStyle = ComboBoxStyle.D ropDownList

ComboBox1.Items .Add("My item 1")
ComboBox1.Items .Add("My item 2")
ComboBox1.Items .Add("My item 3")
End Sub

Private Sub ComboBox1_Selec tionChangeCommi tted(ByVal sender As
Object, ByVal e As System.EventArg s) Handles
ComboBox1.Selec tionChangeCommi tted

MsgBox("test")

End Sub

'#### END CODE ############### ###

[Cor Ligthert [MVP]]

Re: ComboBox SelectionChange Committed event fires twice

ML,

In addition to Tommasso, I did not test it, but found it curious that you
would get an error with this code.

Are you sure that the error is not because that you are selecting inside the
event?

Cor

<docw@globetrot ter.netschreef in bericht
news:1153324853 .715505.123240@ m79g2000cwm.goo glegroups.com.. .

SelectionChange Committed event fires twice
>
Hi,
>
Please have a look at the following ComboBox behavior.
With the code below, if you click in the dropdown list with the mouse
to select an item , everything is fine.
>
But if you use the Enter key to select in the dropdown list, the
SelectionChange Committed event is fired twice.
>
How can I cancel the second event firing ?
>
Thanks
ML
'#### BEGIN CODE ############### ###
>
Private Sub FormTest_Load(B yVal sender As System.Object, ByVal e As
System.EventArg s) Handles MyBase.Load
ComboBox1.DropD ownStyle = ComboBoxStyle.D ropDownList
>
ComboBox1.Items .Add("My item 1")
ComboBox1.Items .Add("My item 2")
ComboBox1.Items .Add("My item 3")
End Sub
>
Private Sub ComboBox1_Selec tionChangeCommi tted(ByVal sender As
Object, ByVal e As System.EventArg s) Handles
ComboBox1.Selec tionChangeCommi tted
>
MsgBox("test")
>
End Sub
>
'#### END CODE ############### ###
>

[Larry Lard]

Re: ComboBox SelectionChange Committed event fires twice

docw@globetrott er.net wrote:

SelectionChange Committed event fires twice
>
Hi,
>
Please have a look at the following ComboBox behavior.
With the code below, if you click in the dropdown list with the mouse
to select an item , everything is fine.
>
But if you use the Enter key to select in the dropdown list, the
SelectionChange Committed event is fired twice.
>
How can I cancel the second event firing ?

Reproduced in 2003 - thanks for the complete sample.

I think your options are:

- upgrade (I know this probably isn't an available option)
- rework your app so that it isn't a problem that this event fires twice
in these circumstances - how about you only do whatever you want to do
on selection change if the selection *actually changes* - ie, keep a
separate track of what the current selection is, and if you get a
SelectionChange Committed but the new selection is the same as the
current stored selection, don't do anything.

--
Larry Lard
larrylard@googl email.com
The address is real, but unread - please reply to the group
For VB and C# questions - tell us which version

[Cor Ligthert [MVP]]

Re: ComboBox SelectionChange Committed event fires twice

Docw,

I call the combobox for myself always the bugbox.

By the way, you know that there is a servicepack for Net 1.1, I don't know
if your problem is fixed in that.

http://www.microsoft.com/downloads/d...7-034d1e7cf3a3

Cor




<docw@globetrot ter.netschreef in bericht
news:1153324853 .715505.123240@ m79g2000cwm.goo glegroups.com.. .

SelectionChange Committed event fires twice
>
Hi,
>
Please have a look at the following ComboBox behavior.
With the code below, if you click in the dropdown list with the mouse
to select an item , everything is fine.
>
But if you use the Enter key to select in the dropdown list, the
SelectionChange Committed event is fired twice.
>
How can I cancel the second event firing ?
>
Thanks
ML
'#### BEGIN CODE ############### ###
>
Private Sub FormTest_Load(B yVal sender As System.Object, ByVal e As
System.EventArg s) Handles MyBase.Load
ComboBox1.DropD ownStyle = ComboBoxStyle.D ropDownList
>
ComboBox1.Items .Add("My item 1")
ComboBox1.Items .Add("My item 2")
ComboBox1.Items .Add("My item 3")
End Sub
>
Private Sub ComboBox1_Selec tionChangeCommi tted(ByVal sender As
Object, ByVal e As System.EventArg s) Handles
ComboBox1.Selec tionChangeCommi tted
>
MsgBox("test")
>
End Sub
>
'#### END CODE ############### ###
>