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Event Handler Lost when Dynamic Controls are added in a DataGrid

Hi All
I have been trying to add a control to the header cell of
a datagrid on my ASP.NET page. These controls are defined
in the HTML as ASP.NET web controls.
They are being added into the header of the datagrid in
the "ItemDataBo und" method of the grid. However, once,
they are added in the grid, i seem to lose the event
handler for the same control. Is there anyone who has
tried this before and knows why this is hapenning ??

Thanks in Advance
Ashish Shridharan
Jul 19 '05 #1
8 7941
Yes, I have done something like that. It is a PAIN.

You're "losing" your event handler because the control is
dynamic and if you do a postback it doesn't know that the
control exists, even though it may be in the viewstate.

you will have to recreate the control in the OnInit.
-----Original Message-----
Hi All
I have been trying to add a control to the header cell of
a datagrid on my ASP.NET page. These controls are defined
in the HTML as ASP.NET web controls.
They are being added into the header of the datagrid in
the "ItemDataBo und" method of the grid. However, once,
they are added in the grid, i seem to lose the event
handler for the same control. Is there anyone who has
tried this before and knows why this is hapenning ??

Thanks in Advance
Ashish Shridharan
.

Jul 19 '05 #2
Yes, i guessed as much, which is why i have also defined
those controls in the html as independent web server
controls. All i am doing in the ItemDataBound of the
datagrid is positioning those controls in the header.

Now the page posts back for each of these controls. looks
like i'll have to set up a different mechanism to figure
out which control posted back. Any ideas ??

-----Original Message-----
Yes, I have done something like that. It is a PAIN.

You're "losing" your event handler because the control is
dynamic and if you do a postback it doesn't know that the
control exists, even though it may be in the viewstate.

you will have to recreate the control in the OnInit.
-----Original Message-----
Hi All
I have been trying to add a control to the header cell ofa datagrid on my ASP.NET page. These controls are definedin the HTML as ASP.NET web controls.
They are being added into the header of the datagrid in
the "ItemDataBo und" method of the grid. However, once,
they are added in the grid, i seem to lose the event
handler for the same control. Is there anyone who has
tried this before and knows why this is hapenning ??

Thanks in Advance
Ashish Shridharan
.

.

Jul 19 '05 #3
you might need to add a HtmlInputHidden control to your
form. Write a JavaScript function and hook it up to the
OnClick event of your control. In the JavaScript set the
value of the HtmlInputHidden control to be the ID of the
control that was clicked. Then when you recreate
everything on PostBack you will know what control was
clicked and your app will know what to do next.
-----Original Message-----
Yes, i guessed as much, which is why i have also defined
those controls in the html as independent web server
controls. All i am doing in the ItemDataBound of the
datagrid is positioning those controls in the header.

Now the page posts back for each of these controls. looks
like i'll have to set up a different mechanism to figure
out which control posted back. Any ideas ??

-----Original Message-----
Yes, I have done something like that. It is a PAIN.

You're "losing" your event handler because the control is
dynamic and if you do a postback it doesn't know that thecontrol exists, even though it may be in the viewstate.

you will have to recreate the control in the OnInit.
-----Original Message-----
Hi All
I have been trying to add a control to the header cell

ofa datagrid on my ASP.NET page. These controls aredefinedin the HTML as ASP.NET web controls.
They are being added into the header of the datagrid in
the "ItemDataBo und" method of the grid. However, once,
they are added in the grid, i seem to lose the event
handler for the same control. Is there anyone who has
tried this before and knows why this is hapenning ??

Thanks in Advance
Ashish Shridharan
.

.

.

Jul 19 '05 #4
it took me about a month to figure it out. I kept posting
to forums and everyone kept asking me why I was doing what
I was doing and no one had a solution.
After a lot of trial and error I got something to work.

Now I watch for posts like yours on forums and I try to
help people who are using dynamic controls. Maybe I can
save someone else some time and headaches. : )

Good luck!!
-----Original Message-----
Thanks. This was exactly what i had already started
working towards. And you were right, it is really a pain.
-----Original Message-----
you might need to add a HtmlInputHidden control to your
form. Write a JavaScript function and hook it up to the
OnClick event of your control. In the JavaScript set the
value of the HtmlInputHidden control to be the ID of the
control that was clicked. Then when you recreate
everything on PostBack you will know what control was
clicked and your app will know what to do next.
-----Original Message-----
Yes, i guessed as much, which is why i have also definedthose controls in the html as independent web server
controls. All i am doing in the ItemDataBound of the
datagrid is positioning those controls in the header.

Now the page posts back for each of these controls.

lookslike i'll have to set up a different mechanism to figureout which control posted back. Any ideas ??
-----Original Message-----
Yes, I have done something like that. It is a PAIN.

You're "losing" your event handler because the control

is
dynamic and if you do a postback it doesn't know that

the
control exists, even though it may be in the viewstate.

you will have to recreate the control in the OnInit.

>-----Original Message-----
>Hi All
>I have been trying to add a control to the header cellof
>a datagrid on my ASP.NET page. These controls are
defined
>in the HTML as ASP.NET web controls.
>They are being added into the header of the datagridin>the "ItemDataBo und" method of the grid. However, once,>they are added in the grid, i seem to lose the event
>handler for the same control. Is there anyone who has
>tried this before and knows why this is hapenning ??
>
>Thanks in Advance
>Ashish Shridharan
>.
>
.

.

.

.

Jul 19 '05 #5
Hello Angela -

I am actually sheding tears reading this thread. I also have spent at least
5 sleepless nights trying to figure this out. Also kept posting to the web
and was ignored or people thought I was crazy.

My solution was to use HTML controls with an onclick event setting a flag in
a hidden variable using client side javascript exactly as you defined. I am
a little curious how you can "hook up to the onclick event of your control".
It was exactly this onclick event handler that would not exists and would
not be fired if the control was created dynmamically. Using HTML image
controls solved my problem, but if you get a second, could you please let me
know what you meant by the "hookup"?

Also, thanks for the tid bit on using HtmlInputHidden control. I have to
read up on that. I was using a textbox web form control. One interesting
detail is that I could obviously not set visible to false for the textbox,
but even if I set enabled to fales, the value in the textbox set from
Javascript did not survive the post back.

Thanks again.

Jim

"Angela" <An************ *@globalcrossin g.com> wrote in message
news:11******** *************** *****@phx.gbl.. .
it took me about a month to figure it out. I kept posting
to forums and everyone kept asking me why I was doing what
I was doing and no one had a solution.
After a lot of trial and error I got something to work.

Now I watch for posts like yours on forums and I try to
help people who are using dynamic controls. Maybe I can
save someone else some time and headaches. : )

Good luck!!
-----Original Message-----
Thanks. This was exactly what i had already started
working towards. And you were right, it is really a pain.
-----Original Message-----
you might need to add a HtmlInputHidden control to your
form. Write a JavaScript function and hook it up to the
OnClick event of your control. In the JavaScript set thevalue of the HtmlInputHidden control to be the ID of the
control that was clicked. Then when you recreate
everything on PostBack you will know what control was
clicked and your app will know what to do next.

-----Original Message-----
Yes, i guessed as much, which is why i have also definedthose controls in the html as independent web server
controls. All i am doing in the ItemDataBound of the
datagrid is positioning those controls in the header.

Now the page posts back for each of these controls.

looks
like i'll have to set up a different mechanism to figureout which control posted back. Any ideas ??
>-----Original Message-----
>Yes, I have done something like that. It is a PAIN.
>
>You're "losing" your event handler because the control
is
>dynamic and if you do a postback it doesn't know that
the
>control exists, even though it may be in the viewstate.
>
>you will have to recreate the control in the OnInit.
>
>
>
>>-----Original Message-----
>>Hi All
>>I have been trying to add a control to the header cellof
>>a datagrid on my ASP.NET page. These controls are
defined
>>in the HTML as ASP.NET web controls.
>>They are being added into the header of the datagrid

in
>>the "ItemDataBo und" method of the grid. However, once,>>they are added in the grid, i seem to lose the event
>>handler for the same control. Is there anyone who has
>>tried this before and knows why this is hapenning ??
>>
>>Thanks in Advance
>>Ashish Shridharan
>>.
>>
>.
>
.

.

.

Jul 19 '05 #6
See my post further down the thread, but.....

I had two work arounds to address the issue.

The first and the one I have stuck with is to use HTML controls with
javascript setting a flag as to which control was clicked. On post back I
do the processing. I am not sure how Angela would trap the onclick event of
a web form imagebutton as this was the event handler that would go away on
me and never fire. Let me know if you get it in the end.

The second approach you might find interesting. The reason the event does
not fire is that the load_page fires before the onclick event. Since the
control was created dynamically, the control did not exist in the load page
and I guess it could never call the event once the event was suppose to
fire. Only you could follow this as you have lived with the pain.

Anyway the work around I did not like was to create a funcing...
MakeControls(). Call Make controlls in the proper location, but call it
again on every postback. Even if the properties of the control were wrong
in the load_page event, you will find that the event handler is available
and your event will fire.

I kept posting the question... How can I make an event hander public and
not tied to a control that is loaded dynamically to find a way around
calling MakeControls twice (once in code and every time I did a postback),
but no one seemed to understand the problem.

I did read one obscure post that talked about Java being way ahead of .NET
when it came to persistance. (sp). I think that may be a clue to the
problem.

I am still sort of waiting for some one to post an answer to .... How do
you create a control at run time and preserve the event handler without
using client side java script.

Jim
"Ashish Shridharan" <as****@us-orionin.com> wrote in message
news:10******** *************** *****@phx.gbl.. .
Hi All
I have been trying to add a control to the header cell of
a datagrid on my ASP.NET page. These controls are defined
in the HTML as ASP.NET web controls.
They are being added into the header of the datagrid in
the "ItemDataBo und" method of the grid. However, once,
they are added in the grid, i seem to lose the event
handler for the same control. Is there anyone who has
tried this before and knows why this is hapenning ??

Thanks in Advance
Ashish Shridharan

Jul 19 '05 #7
You can check out this thread as well from the datagrid forum.....

That looks like it will work. I am going to give it a shot in a day or two
once I sort out my other challenge. Thanks again. When you see the other
challenge, you do not have to reply. You can wait a month before answering
another of my posts :-). I will reply for a final note once this all works.

"Stevie_mac " <no******@pleas e.com> wrote in message
news:bi******** **@newsg4.svr.p ol.co.uk...
You know, the bit that was getting me was having AutoGenerateCol umns
off, this just makes this perticular job harder. There is a very easy way
(now that i understand your requirements) to achieve this

The easiest way to do this is...

DG -
* 1st switch on AutoGenerateCol umns
* Add a 'Detail' Link Button (in templated col)

Code
* Generate your 1st SQL string (ie Contact View button was clicked)
* Get data, Set DG.Source & Bind it
* In ItemDataBound (for top level), setup the 'Detail' Link
buttons CommandName to 'Contact' - when the LinkButton is
clicked, you'll get it in ItemCommand.
* In ItemCommand, rebuild you SQL based on CommandName
being 'Contact'
* Rebind grid with new SQL query
* In ItemDataBound, setup the 'Detail' Link
buttons CommandName to 'AccountDetail' - when the LinkButton is
clicked, you'll get it in ItemCommand.
* In ItemCommand, rebuild you SQL based on CommandName
being 'AccountDetail'

Does this make sense?

This way, no matter how many columns/fields you have, all will be displayed with a 'Detail' Link button adjacent (ofcourse you can hide this column once you reach a 'lowest drill down point'

The only down side is the separate 'Detail' column but if theres room, why sweat it?
I can show you how if you need me too - i dont mind. But you know that the fun is in the chase, otherwise, i'm gonna leave off for a bit - let you get in to it.
I'll keep track of the post (or you can email me) if i forget

Good luck

"Jim Mitchell" <ji**********@m indspring.com> wrote in message news:Ok******** ******@tk2msftn gp13.phx.gbl...
Steve - My last post probably confused you because I said "I know I could do it with 2 datagrids". Let me explain the application a bit further....

I have two "views" I can use controlled by a toolbar. Contact View and
Account View. The screen looks almost the same to the user. There is one datagrid. In "Contact View" clicking on the datagrid displays the name and address of the contact. In "Account View", clicking on the datagrid
displays the Account name and Account Address.

So the account datagrid does not populate a datagrid of contacts, there are just tow different views (modes) the page can be in at any time.

When I said, "I can do it with two datagrids, I meant a datagrid for
Accounts and a datagrid for contacts that I turn visibility off and on.
Even though this would work here, I want to have more views down the road on the same page for reports etc.. I just want to use a single datagrid for all views and it seems like I should be able to do so.

Again, I will get back to you once I test your options.

Thanks, Jim
"Stevie_mac " <no******@pleas e.com> wrote in message
news:bi******** **@news7.svr.po l.co.uk...
Jim, I'm not entirely sure what you are doing here so heres my best

guess...

You intend to have one grid filled with Company names (link buttons)
1. When one of the Company names is clicked, you want to re-populate the
grid
grid with Contacts based on your selection??
OR
2. When one of the Company names is clicked, you want to populate a
2nd grid
with Contacts based on your selection?
Ok, this is what i did...
Tried adding handler DataGrid ItemCommand manually (in BindGrid) - No

Good!
Tried adding handler DataGrid ItemSelctionCha nged manually (in
BindGrid) - No
Good!
Tried adding handler button manually (in ItemCreated) - No Good!
Tried adding handler button manually (in ItemDataBound) - No Good!
Tried other tricks - direct from my sleive - No Good.
I Figure i could add a JavaScript handler to the link buttons to
call __DoPostBack() manually but I gave up & went for the EASY

OPTION Templates!!!...

I dont understand (though there usually a reason) why you want to

dynamically
create the
LinkButtons in this particular excersize ???
Any hoo, heres my solution (option 2) ***How i got there - The actual

code is
below if you wanna skip this)***
Create 1 grid called CompaniesGrid
* add 1 Select Button Column.
* Convert it to a template item + apply
* Right click the grid & choose to Edit Tempate Col 0 - you'll see your linkbutton
* Open the databinding options for the LinkButton & set custom binding on the Text property to DataBinder.Eval (Container, "DataItem.Compa ny")
* Set custom binding on the CommandArgument property also. Set this
to DataBinder.Eval (Container, "DataItem.I D")
* OK the changes to your grid
* Add a event handler for ItemCommand
(In ItemCommand, Call function that Binds 2nd grid based on
e.Item.CommandA rgument - which by the way will be you ID from
the Companys table - this keys into the Contacts table!)

Create a 2nd grid called ContactsGrid
* Open the property builder & add 1 Bound Column
* Set the Data Field to 'Contact'
* OK this

*************** *************** *******
Heres my code (this assumes 2 SQL Tables)
*************** *************** *******

*************** *************** *******
SQL Tables...
-------------------------------------------------
Table 1 : tblCompanys (ID = Pri Key)
-------------------------------------------------
ID int (Not Null)
Company varchar(50) [what ever!]

-------------------------------------------------
Table 2 : tblContacts (ID + Contact = Pri Key)
-------------------------------------------------
ID int (not Null)
Contact varchar(50) [what ever!]
*************** *************** *******
*************** *************** *******
VB Code...
-------------------------------------------------
Private Sub Page_Load(ByVal sender As System.Object, _
ByVal e As System.EventArg s) Handles MyBase.Load
If Not IsPostBack Then
BindGrid("Compa ny")
End If
End Sub

Sub BindGrid(ByVal field_name As String, _
Optional ByVal sID As String = "")
Dim mycn As SqlClient.SqlCo nnection
Dim cmd As SqlClient.SqlCo mmand
Dim mysql As String
mycn = New SqlClient.SqlCo nnection( _
System.Configur ation.Configura tionSettings.Ap pSettings( _
"ConnectString" ))
If field_name = "Company" Then
mysql = "Select * from tblCompanys"
mycn.Open()
cmd = New SqlClient.SqlCo mmand(mysql, mycn)
CompaniesGrid.D ataKeyField = "ID"
CompaniesGrid.D ataSource = cmd.ExecuteRead er()
CompaniesGrid.D ataBind()
cmd.Dispose()
mycn.Close()
End If

If field_name = "Contact" Then
mysql = "Select * from tblContacts"
If sID <> "" Then
mysql &= " WHERE ID='" & sID & "';"
End If
mycn.Open()
cmd = New SqlClient.SqlCo mmand(mysql, mycn)
ContactsGrid.Da taKeyField = "ID"
ContactsGrid.Da taSource = cmd.ExecuteRead er()
ContactsGrid.Da taBind()
cmd.Dispose()
mycn.Close()
End If
End Sub

Private Sub CompaniesGrid_I temCommand( _
ByVal source As Object, _
ByVal e As System.Web.UI.W ebControls.Data GridCommandEven tArgs) _
Handles CompaniesGrid.I temCommand
BindGrid("Conta ct", e.CommandArgume nt)
End Sub
*************** *************** *******

*************** *************** *******
And heres my ASPX code (paste this after <Form...> and before </Form>) -------------------------------------------------
<asp:datagrid id="CompaniesGr id"
style="Z-INDEX: 100; LEFT: 16px; POSITION: absolute; TOP: 16px"
runat="server" AutoGenerateCol umns="False" Width="216px"
BorderColor="#C CCCCC" BorderStyle="No ne" BorderWidth="1p x"
BackColor="Whit e" CellPadding="3" >
<SelectedItemSt yle Font-Bold="True" ForeColor="Whit e"
BackColor="#669 999"></SelectedItemSty le>
<ItemStyle ForeColor="#000 066"></ItemStyle>
<HeaderStyle Font-Bold="True" ForeColor="Whit e"
BackColor="#006 699"></HeaderStyle>
<FooterStyle ForeColor="#000 066" BackColor="Whit e"></FooterStyle>
<Columns>
<asp:TemplateCo lumn>
<HeaderTemplate >
Companies
</HeaderTemplate>
<ItemTemplate >
<asp:LinkButt on id=LinkButton1 runat="server"
Text='<%# DataBinder.Eval (Container, "DataItem.Compa ny") %>'
CommandName="Se lect" CausesValidatio n="False"
CommandArgument ='<%# DataBinder.Eval (Container, "DataItem.I D") %>'> </asp:LinkButton>
</ItemTemplate>
</asp:TemplateCol umn>
</Columns>
<PagerStyle HorizontalAlign ="Left" ForeColor="#000 066"
BackColor="Whit e" Mode="NumericPa ges"></PagerStyle>
</asp:datagrid>
<asp:datagrid id="ContactsGri d"
style="Z-INDEX: 104; LEFT: 240px; POSITION: absolute; TOP: 16px"
runat="server" AutoGenerateCol umns="False" Width="264px"
BorderColor="#C CCCCC" BorderStyle="No ne" BorderWidth="1p x"
BackColor="Whit e" CellPadding="3" >
<SelectedItemSt yle Font-Bold="True" ForeColor="Whit e"
BackColor="#669 999"></SelectedItemSty le>
<ItemStyle ForeColor="#000 066"></ItemStyle>
<HeaderStyle Font-Bold="True" ForeColor="Whit e"
BackColor="#006 699"></HeaderStyle>
<FooterStyle ForeColor="#000 066" BackColor="Whit e"></FooterStyle>
<Columns>
<asp:BoundColum n DataField="Cont act"
HeaderText="Con tacts"></asp:BoundColumn >
</Columns>
<PagerStyle HorizontalAlign ="Left" ForeColor="#000 066"
BackColor="Whit e" Mode="NumericPa ges"></PagerStyle>
</asp:datagrid>
*************** *************** *******
"Jim Mitchell" <ji**********@m indspring.com> wrote in message
news:eT******** ******@tk2msftn gp13.phx.gbl...
> Hello Steve - Thanks for the inspiration, but I may never get it :).
>

>>>>>>>>>> SNIP <<<<<<<<<<<<<




"Ashish Shridharan" <as****@us-orionin.com> wrote in message
news:10******** *************** *****@phx.gbl.. . Hi All
I have been trying to add a control to the header cell of
a datagrid on my ASP.NET page. These controls are defined
in the HTML as ASP.NET web controls.
They are being added into the header of the datagrid in
the "ItemDataBo und" method of the grid. However, once,
they are added in the grid, i seem to lose the event
handler for the same control. Is there anyone who has
tried this before and knows why this is hapenning ??

Thanks in Advance
Ashish Shridharan

Jul 19 '05 #8
Hi Jim,

The idea is to (via javascript) save an identifier (for
the control that invoked the postback) in the hidden field.

Now, in the pageload event of the page, check the value of
the hidden field and based on that, call the corresponding
method (which would have been called by that particular
control under normal circumstances).

A sample code snippet for your pageload event

Private Sub Page_Load(ByVal sender As System.Object, _
ByVal e As System.EventArg s) _
Handles MyBase.Load
if Page.IsPostBack then
if htmlhidden.valu e = "textbox3" then
textbox3_OnClic k(nothing, nothing)
end if
end if
end sub

Hope this helps

Ashish Shridharan
Jul 19 '05 #9

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Dear forum friends, With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
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9510
agi2029
by: agi2029 | last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own.... Now, this would greatly impact the work of software developers. The idea...
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7909
isladogs
by: isladogs | last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM). In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules. He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms. Adolph will...
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7076
by: conductexam | last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one. At the time of converting from word file to html my equations which are in the word document file was convert into image. Globals.ThisAddIn.Application.ActiveDocument.Select();...
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4550
by: 6302768590 | last post by:
Hai team i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
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4149
muto222
by: muto222 | last post by:
How can i add a mobile payment intergratation into php mysql website.

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