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From: Onur Güzel on 16 Jun 2010 14:17
On Jun 15, 9:52 pm, sid <sidwe...(a)alexian.net> wrote:
> Using the following code snip in VB.net, When I start the app and
> pulldown the list from the combox box it tries to make a selection.
> But I don't want this feature. How do I prevent it.
> Why is the first item of the list selected as soon as the pulldown
> drops ?
>
> Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As
> System.EventArgs) Handles MyBase.Load
>
>         Dim i As Integer
>
>         For i = 0 To 5
>             Me.ComboBox1.Items.Add(Chr(65 + i) & "- " & Format(i,
> "00"))
>         Next
>         Me.ComboBox1.Text = "A"
>
> End Sub

Probably your combobox's "DropDownStyle" property was NOT set to
"DropDownList" (Maybe it's "DropDown"). Based on my experiment, the
behaviour doesn't occur if it is a "DropDownList" combobox (No item
gets selected automatically when user clicks on Combobox).

HTH,

Onur Güzel
From: sid on 16 Jun 2010 16:15
On Jun 16, 1:17 pm, Onur Güzel <kimiraikkone...(a)gmail.com> wrote:
> On Jun 15, 9:52 pm, sid <sidwe...(a)alexian.net> wrote:
>
>
>
>
>
> > Using the following code snip in VB.net, When I start the app and
> > pulldown the list from the combox box it tries to make a selection.
> > But I don't want this feature. How do I prevent it.
> > Why is the first item of the list selected as soon as the pulldown
> > drops ?
>
> > Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As
> > System.EventArgs) Handles MyBase.Load
>
> >         Dim i As Integer
>
> >         For i = 0 To 5
> >             Me.ComboBox1.Items.Add(Chr(65 + i) & "- " & Format(i,
> > "00"))
> >         Next
> >         Me.ComboBox1.Text = "A"
>
> > End Sub
>
> Probably your combobox's "DropDownStyle" property was NOT set to
> "DropDownList" (Maybe it's "DropDown"). Based on my experiment, the
> behaviour doesn't occur if it is a "DropDownList" combobox (No item
> gets selected automatically when user clicks on Combobox).
>
> HTH,
>
> Onur Güzel- Hide quoted text -
>
> - Show quoted text -

Yes, but then you don't get a textbox to type in if you want to make
an entry that is not in the list.
From: Onur Güzel on 17 Jun 2010 02:25
On Jun 16, 11:15 pm, sid <sidwe...(a)alexian.net> wrote:
> On Jun 16, 1:17 pm, Onur Güzel <kimiraikkone...(a)gmail.com> wrote:
>
>
>
> > On Jun 15, 9:52 pm, sid <sidwe...(a)alexian.net> wrote:
>
> > > Using the following code snip in VB.net, When I start the app and
> > > pulldown the list from the combox box it tries to make a selection.
> > > But I don't want this feature. How do I prevent it.
> > > Why is the first item of the list selected as soon as the pulldown
> > > drops ?
>
> > > Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As
> > > System.EventArgs) Handles MyBase.Load
>
> > >         Dim i As Integer
>
> > >         For i = 0 To 5
> > >             Me.ComboBox1.Items.Add(Chr(65 + i) & "- " & Format(i,
> > > "00"))
> > >         Next
> > >         Me.ComboBox1.Text = "A"
>
> > > End Sub
>
> > Probably your combobox's "DropDownStyle" property was NOT set to
> > "DropDownList" (Maybe it's "DropDown"). Based on my experiment, the
> > behaviour doesn't occur if it is a "DropDownList" combobox (No item
> > gets selected automatically when user clicks on Combobox).
>
> > HTH,
>
> > Onur Güzel- Hide quoted text -
>
> > - Show quoted text -
>
> Yes, but then you don't get a textbox to type in if you want to make
> an entry that is not in the list.

Yes, i have tought that but there's no such event that's fired after
dropdown portion is displayed then we would have chance to change
selectedindex. However, in the code of comobox item population which
you posted , "A-00" gets selected automatically because you're setting
text "A" to combobox. As you want leave DropDownStyle property as
"DropDown", which allows you to edit combox text area with keyboard,
you can overcome this behaviour by adding a textbox above the
combobox, whose height will be same as combobox and width will be less
as much as combobox's drop-down arrow, then you send back the
combobox, in your form_load set text to textbox, rather than combobox:

Like:

Dim i As Integer
For i = 0 To 5
Me.ComboBox1.Items.Add _
(Chr(65 + i) & "- " & Format(i, "00"))
Next
Me.TextBox1.Text = "A"

Finally, of course you must equalise combobox selection with textbox,
if user selects any item in combobox.

Private Sub ComboBox1_SelectedIndexChanged _
(ByVal sender As System.Object, _
ByVal e As System.EventArgs) _
Handles ComboBox1.SelectedIndexChanged
TextBox1.Text = ComboBox1.SelectedItem
End Sub

At this time you will be able to use drop-down portion of combobox but
nobody will see any selection as textbox is in the front. To describe
what i mean, look at the screenshoot which will clarify the trick:

http://img541.imageshack.us/img541/8721/resimnew.jpg

HTH,

Onur Güzel

From: sid on 17 Jun 2010 16:27
On Jun 17, 1:25 am, Onur Güzel <kimiraikkone...(a)gmail.com> wrote:
> On Jun 16, 11:15 pm, sid <sidwe...(a)alexian.net> wrote:
>
>
>
>
>
> > On Jun 16, 1:17 pm, Onur Güzel <kimiraikkone...(a)gmail.com> wrote:
>
> > > On Jun 15, 9:52 pm, sid <sidwe...(a)alexian.net> wrote:
>
> > > > Using the following code snip in VB.net, When I start the app and
> > > > pulldown the list from the combox box it tries to make a selection.
> > > > But I don't want this feature. How do I prevent it.
> > > > Why is the first item of the list selected as soon as the pulldown
> > > > drops ?
>
> > > > Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As
> > > > System.EventArgs) Handles MyBase.Load
>
> > > >         Dim i As Integer
>
> > > >         For i = 0 To 5
> > > >             Me.ComboBox1.Items.Add(Chr(65 + i) & "- " & Format(i,
> > > > "00"))
> > > >         Next
> > > >         Me.ComboBox1.Text = "A"
>
> > > > End Sub
>
> > > Probably your combobox's "DropDownStyle" property was NOT set to
> > > "DropDownList" (Maybe it's "DropDown"). Based on my experiment, the
> > > behaviour doesn't occur if it is a "DropDownList" combobox (No item
> > > gets selected automatically when user clicks on Combobox).
>
> > > HTH,
>
> > > Onur Güzel- Hide quoted text -
>
> > > - Show quoted text -
>
> > Yes, but then you don't get a textbox to type in if you want to make
> > an entry that is not in the list.
>
> Yes, i have tought that but there's no such event that's fired after
> dropdown portion is displayed then we would have chance to change
> selectedindex. However, in the code of comobox item population which
> you posted , "A-00" gets selected automatically because you're setting
> text "A" to combobox. As you want leave DropDownStyle property as
> "DropDown", which allows you to edit combox text area with keyboard,
> you can overcome this behaviour by adding a textbox above the
> combobox, whose height will be same as combobox and width will be less
> as much as combobox's drop-down arrow, then you send back the
> combobox, in your form_load set text to textbox, rather than combobox:
>
> Like:
>
> Dim i As Integer
> For i = 0 To 5
> Me.ComboBox1.Items.Add _
> (Chr(65 + i) & "- " & Format(i, "00"))
> Next
> Me.TextBox1.Text = "A"
>
> Finally, of course you must equalise combobox selection with textbox,
> if user selects any item in combobox.
>
> Private Sub ComboBox1_SelectedIndexChanged _
> (ByVal sender As System.Object, _
> ByVal e As System.EventArgs) _
> Handles ComboBox1.SelectedIndexChanged
> TextBox1.Text = ComboBox1.SelectedItem
> End Sub
>
> At this time you will be able to use drop-down portion of combobox but
> nobody will see any selection as textbox is in the front. To describe
> what i mean, look at the screenshoot which will clarify the trick:
>
> http://img541.imageshack.us/img541/8721/resimnew.jpg
>
> HTH,
>
> Onur Güzel- Hide quoted text -
>
> - Show quoted text -

This was a good solution. I was about to start to create my own
control.
Another programmer had the idea of adding a space to the text on
'DropDown', this fools the Autocomplete by not finding a match, but
this solution was not consistent. Timing issues ...

The floating textbox worked perfectly.

Thanks



From: Onur Güzel on 19 Jun 2010 17:18
On Jun 17, 11:27 pm, sid <sidwe...(a)alexian.net> wrote:
> On Jun 17, 1:25 am, Onur Güzel <kimiraikkone...(a)gmail.com> wrote:
>
>
>
> > On Jun 16, 11:15 pm, sid <sidwe...(a)alexian.net> wrote:
>
> > > On Jun 16, 1:17 pm, Onur Güzel <kimiraikkone...(a)gmail.com> wrote:
>
> > > > On Jun 15, 9:52 pm, sid <sidwe...(a)alexian.net> wrote:
>
> > > > > Using the following code snip in VB.net, When I start the app and
> > > > > pulldown the list from the combox box it tries to make a selection.
> > > > > But I don't want this feature. How do I prevent it.
> > > > > Why is the first item of the list selected as soon as the pulldown
> > > > > drops ?
>
> > > > > Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As
> > > > > System.EventArgs) Handles MyBase.Load
>
> > > > > Dim i As Integer
>
> > > > > For i = 0 To 5
> > > > > Me.ComboBox1.Items.Add(Chr(65 + i) & "- " & Format(i,
> > > > > "00"))
> > > > > Next
> > > > > Me.ComboBox1.Text = "A"
>
> > > > > End Sub
>
> > > > Probably your combobox's "DropDownStyle" property was NOT set to
> > > > "DropDownList" (Maybe it's "DropDown"). Based on my experiment, the
> > > > behaviour doesn't occur if it is a "DropDownList" combobox (No item
> > > > gets selected automatically when user clicks on Combobox).
>
> > > > HTH,
>
> > > > Onur Güzel- Hide quoted text -
>
> > > > - Show quoted text -
>
> > > Yes, but then you don't get a textbox to type in if you want to make
> > > an entry that is not in the list.
>
> > Yes, i have tought that but there's no such event that's fired after
> > dropdown portion is displayed then we would have chance to change
> > selectedindex. However, in the code of comobox item population which
> > you posted , "A-00" gets selected automatically because you're setting
> > text "A" to combobox. As you want leave DropDownStyle property as
> > "DropDown", which allows you to edit combox text area with keyboard,
> > you can overcome this behaviour by adding a textbox above the
> > combobox, whose height will be same as combobox and width will be less
> > as much as combobox's drop-down arrow, then you send back the
> > combobox, in your form_load set text to textbox, rather than combobox:
>
> > Like:
>
> > Dim i As Integer
> > For i = 0 To 5
> > Me.ComboBox1.Items.Add _
> > (Chr(65 + i) & "- " & Format(i, "00"))
> > Next
> > Me.TextBox1.Text = "A"
>
> > Finally, of course you must equalise combobox selection with textbox,
> > if user selects any item in combobox.
>
> > Private Sub ComboBox1_SelectedIndexChanged _
> > (ByVal sender As System.Object, _
> > ByVal e As System.EventArgs) _
> > Handles ComboBox1.SelectedIndexChanged
> > TextBox1.Text = ComboBox1.SelectedItem
> > End Sub
>
> > At this time you will be able to use drop-down portion of combobox but
> > nobody will see any selection as textbox is in the front. To describe
> > what i mean, look at the screenshoot which will clarify the trick:
>
> >http://img541.imageshack.us/img541/8721/resimnew.jpg
>
> > HTH,
>
> > Onur Güzel- Hide quoted text -
>
> > - Show quoted text -
>
> This was a good solution. I was about to start to create my own
> control.
> Another programmer had the idea of adding a space to the text on
> 'DropDown', this fools the Autocomplete by not finding a match, but
> this solution was not consistent. Timing issues ...
>
> The floating textbox worked perfectly.
>
> Thanks

Glad it worked,

cheers,

Onur
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