Thanks for your quick response.
Glad that you've also found your solution on this.
Regards,
Steven Cheng
Microsoft Online Support
Get Secure!
www.microsoft.com/security
(This posting is provided "AS IS", with no warranties, and confers no
rights.)
--------------------
| Thread-Topic: Persisting the currently selected row on a GridView
| thread-index: AcYgIfQ1A6LagImOS0eMeHlP0pDDSg==
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| From: "=?Utf-8?B?RGljaw==?=" <
[email protected]>
| References: <
[email protected]>
<
[email protected]>
<
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<
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| Subject: RE: Persisting the currently selected row on a GridView
| Date: Mon, 23 Jan 2006 05:36:02 -0800
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microsoft.public.dotnet.framework.aspnet:372863
| X-Tomcat-NG: microsoft.public.dotnet.framework.aspnet
|
| Thanks for your reply. Over the weekend I learnt about server-side
sorting
| and paging and this eventually leads to a perfectly elegent solution for
| working out which page the required record will be on.
|
| "Steven Cheng[MSFT]" wrote:
|
| > Thanks for your response Richard,
| >
| > Yes, changing the Page will cause the GridView to rebind the data from
| > DataSource control again.... I'm afraid this is not avoidable if the
| > original selected data item is not on the current Page( or in anothe
word,
| > we have to change page index .....). Also, call the DataBind method
twice
| > won't make the GridView be rendered twice on the page. And the drawback
is
| > that the database will be queried twice (if not using cache) as you
| > mentioned....
| >
| > Regards,
| >
| > Steven Cheng
| > Microsoft Online Support
| >
| > Get Secure!
www.microsoft.com/security
| > (This posting is provided "AS IS", with no warranties, and confers no
| > rights.)
| >
| >
| > --------------------
| > | Thread-Topic: Persisting the currently selected row on a GridView
| > | thread-index: AcYdoU0ECG96QNn/Q3GGTxtnEgBdwQ==
| > | X-WBNR-Posting-Host: 86.137.242.173
| > | From: "=?Utf-8?B?RGljaw==?=" <
[email protected]>
| > | References: <
[email protected]>
| > <
[email protected]>
| > | Subject: RE: Persisting the currently selected row on a GridView
| > | Date: Fri, 20 Jan 2006 01:10:04 -0800
| > | Lines: 112
| > | Message-ID: <
[email protected]>
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| > | Xref: TK2MSFTNGXA02.phx.gbl
| > microsoft.public.dotnet.framework.aspnet:372333
| > | X-Tomcat-NG: microsoft.public.dotnet.framework.aspnet
| > |
| > | Thanks for the reply. I'm almost certain I understood what you wrote.
I
| > think
| > | the (only?) place to calculate the page and index that the record
will be
| > on
| > | is the ObjectDataSource_Selected event because, as far as I can see,
this
| > is
| > | the only event that has access to the underlying datasource. But if I
set
| > | GridView.PageIndex from this event it causes the control to repeat
the
| > call
| > | to the database, i.e. the series of events is thus:
| > |
| > | User selectes to "Refresh Bound Controls"...
| > | 1. ObjectDataSource_Selecting
| > | 2. ObjectDataSource_Selected
| > | 2.1 Calculate and set the required page i.e. GridView.PageIndex =
n
| > | 3. GridView_DataBinding
| > | 4. GridView_DataBound
| > | 5. ObjectDataSource_Selecting
| > | 6. ObjectDataSource_Selected
| > | 7. GridView_DataBinding
| > | 8. GridView_DataBound
| > |
| > | I think that events 5 to 8 are caused by changing the
GridView.PageIndex
| > in
| > | 2.1. The events to not re-fire the second time GridView.PageIndex is
set,
| > | presumably because the PageIndex is already the required value.
| > |
| > | The key thing here is that the database is called twice (and maybe
the
| > page
| > | is rendered on the BRowser twice?) and is thus an overhead that we
should
| > | avoid. Can you help me with a better solution?
| > |
| > |
| > | "Steven Cheng[MSFT]" wrote:
| > |
| > | > Hi Richard,
| > | >
| > | > Welcome to ASPNET newsgroup.
| > | > Regarding on the GridView control's row selection, it is a very
simple
| > | > implementation which dosn't quite associated with the underlying
| > | > datasource, the SelectedIndex only range in the current displayed
page
| > of
| > | > data. So when our page size is set to 5, the available
selectedIndex is
| > | > from 0 to 4....
| > | >
| > | > So when there is changes made on the underlying datasource or page
| > index
| > | > changed... If we still want to keep the original selected dataitem,
I'm
| > | > afraid we have to manually calculate the index of that record on
the
| > | > certain page (according to total records count, page size), then
set
| > the
| > | > proper page index and selected index....
| > | >
| > | > Regards,
| > | >
| > | > Steven Cheng
| > | > Microsoft Online Support
| > | >
| > | > Get Secure!
www.microsoft.com/security
| > | > (This posting is provided "AS IS", with no warranties, and confers
no
| > | > rights.)
| > | >
| > | >
| > | >
| > | > --------------------
| > | > | Thread-Topic: Persisting the currently selected row on a GridView
| > | > | thread-index: AcYdOIdSa2b3anygQnilL8UCN+aWPQ==
| > | > | X-WBNR-Posting-Host: 193.130.25.218
| > | > | From: "=?Utf-8?B?RGljaw==?=" <
[email protected]>
| > | > | Subject: Persisting the currently selected row on a GridView
| > | > | Date: Thu, 19 Jan 2006 12:40:05 -0800
| > | > | Lines: 19
| > | > | Message-ID: <
[email protected]>
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| > | > | Path:
TK2MSFTNGXA02.phx.gbl!TK2MSFTNGP08.phx.gbl!TK2MSFTNGXA03.phx.gbl
| > | > | Xref: TK2MSFTNGXA02.phx.gbl
| > | > microsoft.public.dotnet.framework.aspnet:372201
| > | > | X-Tomcat-NG: microsoft.public.dotnet.framework.aspnet
| > | > |
| > | > | I have a GridView bound to an ObjectDataSource. I have a Button
that
| > | > calls
| > | > | GridView.DataBind. I want the row that is selected before the
| > DataBind to
| > | > | still be selected afterwards.
| > | > |
| > | > | This happens automatically if the data doesn't change. But if
records
| > | > have
| > | > | been added or deleted then it looks as if some code is necessary:
| > I've
| > | > done
| > | > | this by using GridView.SelectedValue to get the key value of the
| > | > currently
| > | > | selected Row and then by itterating through the DataKeys
collection
| > | > (after
| > | > | the DataBind has completed) I can work out the RowIndex of the
Row
| > that
| > | > has
| > | > | the same key value. There's some more code to adjust for the
| > GridView's
| > | > | PageIndex but otherwise this works.
| > | > |
| > | > | But what I've not been able to do is adjust for the occassions
when
| > the
| > | > row
| > | > | that I'm hoping to select is no longer on the same PageIndex.
I've
| > got
| > | > close
| > | > | by handling the ObjectDataSource_Selected event and I can now
predict
| > | > which
| > | > | page the row will be on (although I've not tested wither sort
orders
| > | > effect
| > | > | this). But how do I then make the GridView display the correct
page?
| > | > |
| > | > | Hope you can help.
| > | > |
| > | >
| > | >
| > |
| >
| >
|
