Hi,

How can I capture the vertical scroll bar position for a Listbox.

I have a Listbox of 100 items + when I click on it I post back remove the 
item selected.

After returning to the client browser the list box scroll position is at the 
top.

I want it to be remain in the Proximity of where it was before.

Can I capture the vertical scroll bar position of a ListBox in JavaScript 
and set it?

Thank you,

Lit

I reproduced what you're getting, and fixed it using this code:


Protected Sub ListBox1_SelectedIndexChanged(ByVal sender As Object, 
ByVal e As System.EventArgs) Handles ListBox1.SelectedIndexChanged
         Dim x As Integer = ListBox1.SelectedIndex
         ListBox1.Items.Remove(ListBox1.SelectedItem)
         ListBox1.SelectedIndex = x + 1
End Sub


Steve C.
MCAD,MCSE,MCP+I,CNE,CNA,CCNA


Lit wrote:

> Hi,
> 
> How can I capture the vertical scroll bar position for a Listbox.
> 
> I have a Listbox of 100 items + when I click on it I post back remove the 
> item selected.
> 
> After returning to the client browser the list box scroll position is at the 
> top.
> 
> I want it to be remain in the Proximity of where it was before.
> 
> Can I capture the vertical scroll bar position of a ListBox in JavaScript 
> and set it?
> 
> Thank you,
> 
> Lit
> 
> 

Steve,

Here is the problem:

After post back I don't want the selected Index set because I can no longer 
select that Item by just clicking on it to cause a post back
I have an onSelectedIndexChanged event that fires when a list item is 
selected.

How do I scroll as if I am a user scrolling without selecting anything.

( x below can be index out of bounds if last or listbox is empty )

Any JavaScript tricks, any other Ideas you can think off.

Thank you,


Lit



"Steve"  wrote in message 
news:esaHixB5HHA.1208@TK2MSFTNGP03.phx.gbl...

>I reproduced what you're getting, and fixed it using this code:
>
>
> Protected Sub ListBox1_SelectedIndexChanged(ByVal sender As Object, ByVal 
> e As System.EventArgs) Handles ListBox1.SelectedIndexChanged
>         Dim x As Integer = ListBox1.SelectedIndex
>         ListBox1.Items.Remove(ListBox1.SelectedItem)
>         ListBox1.SelectedIndex = x + 1
> End Sub
>
>
> Steve C.
> MCAD,MCSE,MCP+I,CNE,CNA,CCNA
>
>
> Lit wrote:
>> Hi,
>>
>> How can I capture the vertical scroll bar position for a Listbox.
>>
>> I have a Listbox of 100 items + when I click on it I post back remove the 
>> item selected.
>>
>> After returning to the client browser the list box scroll position is at 
>> the top.
>>
>> I want it to be remain in the Proximity of where it was before.
>>
>> Can I capture the vertical scroll bar position of a ListBox in JavaScript 
>> and set it?
>>
>> Thank you,
>>
>> Lit
>> 

I understand. You're removing the item at index "x", so you can't select 
it anymore. If you set the SelectedIndex to x+1 (or even x-1), that will 
cause the item after (or before) to be the currently selected item. The 
auto-postback still works, the item is still deleted, and the listbox 
scroll position is still preserved.

You can try to capture that via Javascript, but in this case, it's not 
needed, and just adds to the complexity. Besides, if you're using a 
postback, you're already making the round-trip to the server, so you 
might as well do everything there, right?



Steve C.
MCAD,MCSE,MCP+I,CNE,CNA,CCNA


Lit wrote:

> Steve,
> 
> Here is the problem:
> 
> After post back I don't want the selected Index set because I can no longer 
> select that Item by just clicking on it to cause a post back
> I have an onSelectedIndexChanged event that fires when a list item is 
> selected.
> 
> How do I scroll as if I am a user scrolling without selecting anything.
> 
> ( x below can be index out of bounds if last or listbox is empty )
> 
> Any JavaScript tricks, any other Ideas you can think off.
> 
> Thank you,
> 
> 
> Lit
> 
> 
> 
> "Steve"  wrote in message 
> news:esaHixB5HHA.1208@TK2MSFTNGP03.phx.gbl...
>> I reproduced what you're getting, and fixed it using this code:
>>
>>
>> Protected Sub ListBox1_SelectedIndexChanged(ByVal sender As Object, ByVal 
>> e As System.EventArgs) Handles ListBox1.SelectedIndexChanged
>>         Dim x As Integer = ListBox1.SelectedIndex
>>         ListBox1.Items.Remove(ListBox1.SelectedItem)
>>         ListBox1.SelectedIndex = x + 1
>> End Sub
>>
>>
>> Steve C.
>> MCAD,MCSE,MCP+I,CNE,CNA,CCNA
>>
>>
>> Lit wrote:
>>> Hi,
>>>
>>> How can I capture the vertical scroll bar position for a Listbox.
>>>
>>> I have a Listbox of 100 items + when I click on it I post back remove the 
>>> item selected.
>>>
>>> After returning to the client browser the list box scroll position is at 
>>> the top.
>>>
>>> I want it to be remain in the Proximity of where it was before.
>>>
>>> Can I capture the vertical scroll bar position of a ListBox in JavaScript 
>>> and set it?
>>>
>>> Thank you,
>>>
>>> Lit
>>>
> 

Hi Steve,

I am using AJAX so my post back is not the ALL-Page Postback.
I select from the "Source"  list box, add the item to a "Destination" list 
box and remove the item that was selected from the "Source" listbox.
Now if I ( x+1, or x-1 ) I can NO longer select that selected item to 
trigger a postback,  remember I am not clicking on a button.
The selected index change event does not fire when something is already been 
selected.

Also if I change to x+1 or x-1 the event is fired on the server side, I 
think  so I have to disable the event before x+1 or x-1 then enable it 
again.

How can I capture the list box vertical scroll position in JavaScript and 
set it without selecting anything in the listbox
Is this doable for a listbox?

Does <Select    Selected > Fire An event, if not that is good. if yes that 
is not the behavior I want.

Thanks for taking the time to thing this with me.

Lit



"Steve"  wrote in message 
news:uec5DBC5HHA.1184@TK2MSFTNGP04.phx.gbl...

>I understand. You're removing the item at index "x", so you can't select it 
>anymore. If you set the SelectedIndex to x+1 (or even x-1), that will cause 
>the item after (or before) to be the currently selected item. The 
>auto-postback still works, the item is still deleted, and the listbox 
>scroll position is still preserved.
>
> You can try to capture that via Javascript, but in this case, it's not 
> needed, and just adds to the complexity. Besides, if you're using a 
> postback, you're already making the round-trip to the server, so you might 
> as well do everything there, right?
>
>
>
> Steve C.
> MCAD,MCSE,MCP+I,CNE,CNA,CCNA
>
>
> Lit wrote:
>> Steve,
>>
>> Here is the problem:
>>
>> After post back I don't want the selected Index set because I can no 
>> longer select that Item by just clicking on it to cause a post back
>> I have an onSelectedIndexChanged event that fires when a list item is 
>> selected.
>>
>> How do I scroll as if I am a user scrolling without selecting anything.
>>
>> ( x below can be index out of bounds if last or listbox is empty )
>>
>> Any JavaScript tricks, any other Ideas you can think off.
>>
>> Thank you,
>>
>>
>> Lit
>>
>>
>>
>> "Steve"  wrote in message 
>> news:esaHixB5HHA.1208@TK2MSFTNGP03.phx.gbl...
>>> I reproduced what you're getting, and fixed it using this code:
>>>
>>>
>>> Protected Sub ListBox1_SelectedIndexChanged(ByVal sender As Object, 
>>> ByVal e As System.EventArgs) Handles ListBox1.SelectedIndexChanged
>>>         Dim x As Integer = ListBox1.SelectedIndex
>>>         ListBox1.Items.Remove(ListBox1.SelectedItem)
>>>         ListBox1.SelectedIndex = x + 1
>>> End Sub
>>>
>>>
>>> Steve C.
>>> MCAD,MCSE,MCP+I,CNE,CNA,CCNA
>>>
>>>
>>> Lit wrote:
>>>> Hi,
>>>>
>>>> How can I capture the vertical scroll bar position for a Listbox.
>>>>
>>>> I have a Listbox of 100 items + when I click on it I post back remove 
>>>> the item selected.
>>>>
>>>> After returning to the client browser the list box scroll position is 
>>>> at the top.
>>>>
>>>> I want it to be remain in the Proximity of where it was before.
>>>>
>>>> Can I capture the vertical scroll bar position of a ListBox in 
>>>> JavaScript and set it?
>>>>
>>>> Thank you,
>>>>
>>>> Lit
>>>>
>> 

Ahhh, AJAX. Okay, so you've got to preserve the scroll location without 
re-selecting any item in the listbox. I don't think I've ever seen any 
Javascript that can do that, but I'm not a Javascript guru.

Try reposting this in the MS JScript newsgroups. I know JScript isn't 
*exactly* javascript, but I don't think MS has an ASP.NET Ajax newsgroup 
yet.




Lit wrote:

> Hi Steve,
> 
> I am using AJAX so my post back is not the ALL-Page Postback.
> I select from the "Source"  list box, add the item to a "Destination" list 
> box and remove the item that was selected from the "Source" listbox.
> Now if I ( x+1, or x-1 ) I can NO longer select that selected item to 
> trigger a postback,  remember I am not clicking on a button.
> The selected index change event does not fire when something is already been 
> selected.
> 
> Also if I change to x+1 or x-1 the event is fired on the server side, I 
> think  so I have to disable the event before x+1 or x-1 then enable it 
> again.
> 
> How can I capture the list box vertical scroll position in JavaScript and 
> set it without selecting anything in the listbox
> Is this doable for a listbox?
> 
> Does <Select    Selected > Fire An event, if not that is good. if yes that 
> is not the behavior I want.
> 
> Thanks for taking the time to thing this with me.
> 
> Lit
> 
> 
> 
> "Steve"  wrote in message 
> news:uec5DBC5HHA.1184@TK2MSFTNGP04.phx.gbl...
>> I understand. You're removing the item at index "x", so you can't select it 
>> anymore. If you set the SelectedIndex to x+1 (or even x-1), that will cause 
>> the item after (or before) to be the currently selected item. The 
>> auto-postback still works, the item is still deleted, and the listbox 
>> scroll position is still preserved.
>>
>> You can try to capture that via Javascript, but in this case, it's not 
>> needed, and just adds to the complexity. Besides, if you're using a 
>> postback, you're already making the round-trip to the server, so you might 
>> as well do everything there, right?
>>
>>
>>
>> Steve C.
>> MCAD,MCSE,MCP+I,CNE,CNA,CCNA
>>
>>
>> Lit wrote:
>>> Steve,
>>>
>>> Here is the problem:
>>>
>>> After post back I don't want the selected Index set because I can no 
>>> longer select that Item by just clicking on it to cause a post back
>>> I have an onSelectedIndexChanged event that fires when a list item is 
>>> selected.
>>>
>>> How do I scroll as if I am a user scrolling without selecting anything.
>>>
>>> ( x below can be index out of bounds if last or listbox is empty )
>>>
>>> Any JavaScript tricks, any other Ideas you can think off.
>>>
>>> Thank you,
>>>
>>>
>>> Lit
>>>
>>>
>>>
>>> "Steve"  wrote in message 
>>> news:esaHixB5HHA.1208@TK2MSFTNGP03.phx.gbl...
>>>> I reproduced what you're getting, and fixed it using this code:
>>>>
>>>>
>>>> Protected Sub ListBox1_SelectedIndexChanged(ByVal sender As Object, 
>>>> ByVal e As System.EventArgs) Handles ListBox1.SelectedIndexChanged
>>>>         Dim x As Integer = ListBox1.SelectedIndex
>>>>         ListBox1.Items.Remove(ListBox1.SelectedItem)
>>>>         ListBox1.SelectedIndex = x + 1
>>>> End Sub
>>>>
>>>>
>>>> Steve C.
>>>> MCAD,MCSE,MCP+I,CNE,CNA,CCNA
>>>>
>>>>
>>>> Lit wrote:
>>>>> Hi,
>>>>>
>>>>> How can I capture the vertical scroll bar position for a Listbox.
>>>>>
>>>>> I have a Listbox of 100 items + when I click on it I post back remove 
>>>>> the item selected.
>>>>>
>>>>> After returning to the client browser the list box scroll position is 
>>>>> at the top.
>>>>>
>>>>> I want it to be remain in the Proximity of where it was before.
>>>>>
>>>>> Can I capture the vertical scroll bar position of a ListBox in 
>>>>> JavaScript and set it?
>>>>>
>>>>> Thank you,
>>>>>
>>>>> Lit
>>>>>
> 
> 

Steve,

thank you for your input,  I will have to research this or come up with 
other UI

Lit


"Steve"  wrote in message 
news:eZZ3LRC5HHA.5360@TK2MSFTNGP03.phx.gbl...

> Ahhh, AJAX. Okay, so you've got to preserve the scroll location without 
> re-selecting any item in the listbox. I don't think I've ever seen any 
> Javascript that can do that, but I'm not a Javascript guru.
>
> Try reposting this in the MS JScript newsgroups. I know JScript isn't 
> *exactly* javascript, but I don't think MS has an ASP.NET Ajax newsgroup 
> yet.
>
>
>
>
> Lit wrote:
>> Hi Steve,
>>
>> I am using AJAX so my post back is not the ALL-Page Postback.
>> I select from the "Source"  list box, add the item to a "Destination" 
>> list box and remove the item that was selected from the "Source" listbox.
>> Now if I ( x+1, or x-1 ) I can NO longer select that selected item to 
>> trigger a postback,  remember I am not clicking on a button.
>> The selected index change event does not fire when something is already 
>> been selected.
>>
>> Also if I change to x+1 or x-1 the event is fired on the server side, I 
>> think  so I have to disable the event before x+1 or x-1 then enable it 
>> again.
>>
>> How can I capture the list box vertical scroll position in JavaScript and 
>> set it without selecting anything in the listbox
>> Is this doable for a listbox?
>>
>> Does <Select    Selected > Fire An event, if not that is good. if yes 
>> that is not the behavior I want.
>>
>> Thanks for taking the time to thing this with me.
>>
>> Lit
>>
>>
>>
>> "Steve"  wrote in message 
>> news:uec5DBC5HHA.1184@TK2MSFTNGP04.phx.gbl...
>>> I understand. You're removing the item at index "x", so you can't select 
>>> it anymore. If you set the SelectedIndex to x+1 (or even x-1), that will 
>>> cause the item after (or before) to be the currently selected item. The 
>>> auto-postback still works, the item is still deleted, and the listbox 
>>> scroll position is still preserved.
>>>
>>> You can try to capture that via Javascript, but in this case, it's not 
>>> needed, and just adds to the complexity. Besides, if you're using a 
>>> postback, you're already making the round-trip to the server, so you 
>>> might as well do everything there, right?
>>>
>>>
>>>
>>> Steve C.
>>> MCAD,MCSE,MCP+I,CNE,CNA,CCNA
>>>
>>>
>>> Lit wrote:
>>>> Steve,
>>>>
>>>> Here is the problem:
>>>>
>>>> After post back I don't want the selected Index set because I can no 
>>>> longer select that Item by just clicking on it to cause a post back
>>>> I have an onSelectedIndexChanged event that fires when a list item is 
>>>> selected.
>>>>
>>>> How do I scroll as if I am a user scrolling without selecting anything.
>>>>
>>>> ( x below can be index out of bounds if last or listbox is empty )
>>>>
>>>> Any JavaScript tricks, any other Ideas you can think off.
>>>>
>>>> Thank you,
>>>>
>>>>
>>>> Lit
>>>>
>>>>
>>>>
>>>> "Steve"  wrote in message 
>>>> news:esaHixB5HHA.1208@TK2MSFTNGP03.phx.gbl...
>>>>> I reproduced what you're getting, and fixed it using this code:
>>>>>
>>>>>
>>>>> Protected Sub ListBox1_SelectedIndexChanged(ByVal sender As Object, 
>>>>> ByVal e As System.EventArgs) Handles ListBox1.SelectedIndexChanged
>>>>>         Dim x As Integer = ListBox1.SelectedIndex
>>>>>         ListBox1.Items.Remove(ListBox1.SelectedItem)
>>>>>         ListBox1.SelectedIndex = x + 1
>>>>> End Sub
>>>>>
>>>>>
>>>>> Steve C.
>>>>> MCAD,MCSE,MCP+I,CNE,CNA,CCNA
>>>>>
>>>>>
>>>>> Lit wrote:
>>>>>> Hi,
>>>>>>
>>>>>> How can I capture the vertical scroll bar position for a Listbox.
>>>>>>
>>>>>> I have a Listbox of 100 items + when I click on it I post back remove 
>>>>>> the item selected.
>>>>>>
>>>>>> After returning to the client browser the list box scroll position is 
>>>>>> at the top.
>>>>>>
>>>>>> I want it to be remain in the Proximity of where it was before.
>>>>>>
>>>>>> Can I capture the vertical scroll bar position of a ListBox in 
>>>>>> JavaScript and set it?
>>>>>>
>>>>>> Thank you,
>>>>>>
>>>>>> Lit
>>>>>>
>> 

looking for good JavaScript website, groups out here????  that might help in 
this problem?

Thank you,

Lit


"Lit"  wrote in message 
news:%23i5DamB5HHA.4928@TK2MSFTNGP05.phx.gbl...

> Hi,
>
> How can I capture the vertical scroll bar position for a Listbox.
>
> I have a Listbox of 100 items + when I click on it I post back remove the 
> item selected.
>
> After returning to the client browser the list box scroll position is at 
> the top.
>
> I want it to be remain in the Proximity of where it was before.
>
> Can I capture the vertical scroll bar position of a ListBox in JavaScript 
> and set it?
>
> Thank you,
>
> Lit
>
>