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Why does OnClick event not work in 2.0 for DataGridI have a DataGrid in a web application that I upgraded from 1.1 to 2.0. This
DataGrid has a TemplateColumn with a Button control in it. The Button has the OnClick event declared for it in the aspx. When I click the Button, the page posts back, but the OnClick event is not raised. When I declare a Button outside of the DataGrid on the same page with the same OnClick event handler, that one works, but not the one in the DataGrid. This all works fine in the 1.1 version of my code. Does anyone have an explanation or workaround for this in 2.0? Thank. hello harry,
u r nor required to define onclick event of a button inside a grid. just assign a command name property of a button to any string name. and then try to check e.commandname in grid's item command. by this way u can get the onclick of a button inside a grid. hope this will help On Jan 24, 1:16 am, Harry Keck <HarryK***@discussions.microsoft.com> wrote: Show quoteHide quote > I have a DataGrid in a web application that I upgraded from 1.1 to 2.0. This > DataGrid has a TemplateColumn with a Button control in it. The Button has > the OnClick event declared for it in the aspx. When I click the Button, the > page posts back, but the OnClick event is not raised. When I declare a > Button outside of the DataGrid on the same page with the same OnClick event > handler, that one works, but not the one in the DataGrid. This all works > fine in the 1.1 version of my code. Does anyone have an explanation or > workaround for this in 2.0? Thank. Thank you for the suggestion, but that did not help. I even added
ButtonColumns to the DataGrid, but nothing would fire the OnClick or OnItemCommand events on the server side. Then, I started commenting out code and found the one line of code that is apparently causing the problem. Part of my code catches the DataGrid's OnItemCreated event to manipulate the controls rendered in the DataGrid. Here is a part of that code. Button objViewButton = (Button)e.Item.FindControl("ViewButton"); string stringViewButtonID = objViewButton.ClientID; If I replace the line string stringViewButtonID = objViewButton.ClientID; with string stringViewButtonID = "ViewButton"; everything all of a sudden works. This makes no sense to me. Simply referencing the ClientID property of a control is preventing all OnClick commands from processing. This works fine in my 1.1 version of code, but in 2.0, it does not. This has to be a bug of some kind in the framework. Can anyone provide me with any information as to what is causing this? Show quoteHide quote "bhavesh" wrote: > hello harry, > > u r nor required to define onclick event of a button inside a grid. > > just assign a command name property of a button to any string name. > > and then try to check e.commandname in grid's item command. > > by this way u can get the onclick of a button inside a grid. > > hope this will help > > On Jan 24, 1:16 am, Harry Keck <HarryK***@discussions.microsoft.com> > wrote: > > I have a DataGrid in a web application that I upgraded from 1.1 to 2.0. This > > DataGrid has a TemplateColumn with a Button control in it. The Button has > > the OnClick event declared for it in the aspx. When I click the Button, the > > page posts back, but the OnClick event is not raised. When I declare a > > Button outside of the DataGrid on the same page with the same OnClick event > > handler, that one works, but not the one in the DataGrid. This all works > > fine in the 1.1 version of my code. Does anyone have an explanation or > > workaround for this in 2.0? Thank. > > Hi,
sounds like that when accessing ClientID it gets cached, which mixs things, since in ItemCreated the Item itself isn't yet added to grid's Controls collection, so the client id will be fixed to a wrong value, which impacts also on the unique ID. And unique ID is used with postback data routing ClientID should be accessed when the entire control hierarchy is "done". Show quoteHide quote "Harry Keck" <HarryK***@discussions.microsoft.com> wrote in message news:4E447C38-EF2B-4BB6-B517-C838CB3415AD@microsoft.com... > Thank you for the suggestion, but that did not help. I even added > ButtonColumns to the DataGrid, but nothing would fire the OnClick or > OnItemCommand events on the server side. Then, I started commenting out > code > and found the one line of code that is apparently causing the problem. > > Part of my code catches the DataGrid's OnItemCreated event to manipulate > the > controls rendered in the DataGrid. Here is a part of that code. > > Button objViewButton = (Button)e.Item.FindControl("ViewButton"); > string stringViewButtonID = objViewButton.ClientID; > > If I replace the line > > string stringViewButtonID = objViewButton.ClientID; > > with > > string stringViewButtonID = "ViewButton"; > > everything all of a sudden works. This makes no sense to me. Simply > referencing the ClientID property of a control is preventing all OnClick > commands from processing. This works fine in my 1.1 version of code, but > in > 2.0, it does not. This has to be a bug of some kind in the framework. > Can > anyone provide me with any information as to what is causing this? > > "bhavesh" wrote: > >> hello harry, >> >> u r nor required to define onclick event of a button inside a grid. >> >> just assign a command name property of a button to any string name. >> >> and then try to check e.commandname in grid's item command. >> >> by this way u can get the onclick of a button inside a grid. >> >> hope this will help >> >> On Jan 24, 1:16 am, Harry Keck <HarryK***@discussions.microsoft.com> >> wrote: >> > I have a DataGrid in a web application that I upgraded from 1.1 to 2.0. >> > This >> > DataGrid has a TemplateColumn with a Button control in it. The Button >> > has >> > the OnClick event declared for it in the aspx. When I click the >> > Button, the >> > page posts back, but the OnClick event is not raised. When I declare a >> > Button outside of the DataGrid on the same page with the same OnClick >> > event >> > handler, that one works, but not the one in the DataGrid. This all >> > works >> > fine in the 1.1 version of my code. Does anyone have an explanation or >> > workaround for this in 2.0? Thank. >> >> I blogged about the issue:
http://aspadvice.com/blogs/joteke/archive/2007/01/28/Accessing-ClientID-or-UniqueID-too-early-can-cause-issues.aspx Show quoteHide quote "Teemu Keiski" <jot***@aspalliance.com> wrote in message news:8EDA76A3-CEB3-4A44-A9C1-0BF585E619ED@microsoft.com... > Hi, > > sounds like that when accessing ClientID it gets cached, which mixs > things, since in ItemCreated the Item itself isn't yet added to grid's > Controls collection, so the client id will be fixed to a wrong value, > which impacts also on the unique ID. And unique ID is used with postback > data routing > > ClientID should be accessed when the entire control hierarchy is "done". > > -- > Teemu Keiski > AspInsider, ASP.NET MVP > http://blogs.aspadvice.com/joteke > http://teemukeiski.net > > > "Harry Keck" <HarryK***@discussions.microsoft.com> wrote in message > news:4E447C38-EF2B-4BB6-B517-C838CB3415AD@microsoft.com... >> Thank you for the suggestion, but that did not help. I even added >> ButtonColumns to the DataGrid, but nothing would fire the OnClick or >> OnItemCommand events on the server side. Then, I started commenting out >> code >> and found the one line of code that is apparently causing the problem. >> >> Part of my code catches the DataGrid's OnItemCreated event to manipulate >> the >> controls rendered in the DataGrid. Here is a part of that code. >> >> Button objViewButton = (Button)e.Item.FindControl("ViewButton"); >> string stringViewButtonID = objViewButton.ClientID; >> >> If I replace the line >> >> string stringViewButtonID = objViewButton.ClientID; >> >> with >> >> string stringViewButtonID = "ViewButton"; >> >> everything all of a sudden works. This makes no sense to me. Simply >> referencing the ClientID property of a control is preventing all OnClick >> commands from processing. This works fine in my 1.1 version of code, but >> in >> 2.0, it does not. This has to be a bug of some kind in the framework. >> Can >> anyone provide me with any information as to what is causing this? >> >> "bhavesh" wrote: >> >>> hello harry, >>> >>> u r nor required to define onclick event of a button inside a grid. >>> >>> just assign a command name property of a button to any string name. >>> >>> and then try to check e.commandname in grid's item command. >>> >>> by this way u can get the onclick of a button inside a grid. >>> >>> hope this will help >>> >>> On Jan 24, 1:16 am, Harry Keck <HarryK***@discussions.microsoft.com> >>> wrote: >>> > I have a DataGrid in a web application that I upgraded from 1.1 to >>> > 2.0. This >>> > DataGrid has a TemplateColumn with a Button control in it. The Button >>> > has >>> > the OnClick event declared for it in the aspx. When I click the >>> > Button, the >>> > page posts back, but the OnClick event is not raised. When I declare >>> > a >>> > Button outside of the DataGrid on the same page with the same OnClick >>> > event >>> > handler, that one works, but not the one in the DataGrid. This all >>> > works >>> > fine in the 1.1 version of my code. Does anyone have an explanation >>> > or >>> > workaround for this in 2.0? Thank. >>> >>> > 
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