Dynamically Adding Controls

[Nathan Sokalski]

I am trying to dynamically add controls to my page, but am having trouble
with controls such as buttons. I have been able to add simple controls such
as Label controls, because they can be placed anywhere. I have managed to
add Labels using the following code:

Dim extralabel As Label = New Label

extralabel.Text = "Generated Label"

Me.Controls.Add(extralabel)


This places the label at the very end of the generated code inside SPAN
tags. However, when I try something similar with a Button control using the
following code:

Dim extrabutton As Button = New Button

extrabutton.Text = "Generated Button"

Me.Controls.Add(extrabutton)

I recieve an error telling me that a Button control must be between FORM
tags (which makes sense, since a Button control generates an INPUT tag). I
am having trouble figuring out how to add the Button control so that it is
between the form tags. Does anyone know how to do this? A simple example
would be nice. Any help would be appreciated. Thanks.
--
Nathan Sokalski
[email]njsokalski@hotmail.com[/email]
[url]http://www.nathansokalski.com/[/url]

[Bruce Barker]

the most common approach is to add a placeholder control on the form, that
you add the button to. but you can loop thru this.Controls, looking for the
form (check type), then add the button to the form control.

-- bruce (sqlwork.com)


"Nathan Sokalski" <njsokalski@hotmail.com> wrote in message
news:OOrSAWAWFHA.2196@TK2MSFTNGP09.phx.gbl...

>I am trying to dynamically add controls to my page, but am having trouble
>with controls such as buttons. I have been able to add simple controls such
>as Label controls, because they can be placed anywhere. I have managed to
>add Labels using the following code:
>
> Dim extralabel As Label = New Label
>
> extralabel.Text = "Generated Label"
>
> Me.Controls.Add(extralabel)
>
>
> This places the label at the very end of the generated code inside SPAN
> tags. However, when I try something similar with a Button control using
> the following code:
>
> Dim extrabutton As Button = New Button
>
> extrabutton.Text = "Generated Button"
>
> Me.Controls.Add(extrabutton)
>
> I recieve an error telling me that a Button control must be between FORM
> tags (which makes sense, since a Button control generates an INPUT tag). I
> am having trouble figuring out how to add the Button control so that it is
> between the form tags. Does anyone know how to do this? A simple example
> would be nice. Any help would be appreciated. Thanks.
> --
> Nathan Sokalski
> [email]njsokalski@hotmail.com[/email]
> [url]http://www.nathansokalski.com/[/url]
>

[Steve C. Orr [MVP, MCSD]]

I agree with Bruce about the most common approach.
You can also add it to the control collection of any other container control
that might conveniently be in the right place, such as a panel or table
cell.

--
I hope this helps,
Steve C. Orr, MCSD, MVP
[url]http://SteveOrr.net[/url]


"Bruce Barker" <brubar_nospamplease_@safeco.com> wrote in message
news:uiOqYoAWFHA.3320@TK2MSFTNGP12.phx.gbl...

> the most common approach is to add a placeholder control on the form, that
> you add the button to. but you can loop thru this.Controls, looking for
> the form (check type), then add the button to the form control.
>
> -- bruce (sqlwork.com)
>
>
> "Nathan Sokalski" <njsokalski@hotmail.com> wrote in message
> news:OOrSAWAWFHA.2196@TK2MSFTNGP09.phx.gbl...

>>I am trying to dynamically add controls to my page, but am having trouble
>>with controls such as buttons. I have been able to add simple controls
>>such as Label controls, because they can be placed anywhere. I have
>>managed to add Labels using the following code:
>>
>> Dim extralabel As Label = New Label
>>
>> extralabel.Text = "Generated Label"
>>
>> Me.Controls.Add(extralabel)
>>
>>
>> This places the label at the very end of the generated code inside SPAN
>> tags. However, when I try something similar with a Button control using
>> the following code:
>>
>> Dim extrabutton As Button = New Button
>>
>> extrabutton.Text = "Generated Button"
>>
>> Me.Controls.Add(extrabutton)
>>
>> I recieve an error telling me that a Button control must be between FORM
>> tags (which makes sense, since a Button control generates an INPUT tag).
>> I am having trouble figuring out how to add the Button control so that it
>> is between the form tags. Does anyone know how to do this? A simple
>> example would be nice. Any help would be appreciated. Thanks.
>> --
>> Nathan Sokalski
>> [email]njsokalski@hotmail.com[/email]
>> [url]http://www.nathansokalski.com/[/url]
>>

>
>

[gabe garza]

You Add() to an instance of System.Web.UI.HtmlControls.HtmlForm for BUTTONS.
When you use "Me" that's the PAGE not a FORM.

If you have a FORM on your PAGE called:
Protected WithEvents Form1 As System.Web.UI.HtmlControls.HtmlForm

Then you'd add BUTTON controls using:
Dim extrabutton As Button = New Button
extrabutton.Text = "Generated Button"
Form1.Controls.Add(extrabutton)


"Nathan Sokalski" <njsokalski@hotmail.com> wrote in message
news:OOrSAWAWFHA.2196@TK2MSFTNGP09.phx.gbl...

>I am trying to dynamically add controls to my page, but am having trouble
>with controls such as buttons. I have been able to add simple controls such
>as Label controls, because they can be placed anywhere. I have managed to
>add Labels using the following code:
>
> Dim extralabel As Label = New Label
>
> extralabel.Text = "Generated Label"
>
> Me.Controls.Add(extralabel)
>
>
> This places the label at the very end of the generated code inside SPAN
> tags. However, when I try something similar with a Button control using
> the following code:
>
> Dim extrabutton As Button = New Button
>
> extrabutton.Text = "Generated Button"
>
> Me.Controls.Add(extrabutton)
>
> I recieve an error telling me that a Button control must be between FORM
> tags (which makes sense, since a Button control generates an INPUT tag). I
> am having trouble figuring out how to add the Button control so that it is
> between the form tags. Does anyone know how to do this? A simple example
> would be nice. Any help would be appreciated. Thanks.
> --
> Nathan Sokalski
> [email]njsokalski@hotmail.com[/email]
> [url]http://www.nathansokalski.com/[/url]
>

[Nathan Sokalski]

That sounds like it would work when I already have a named form, but I just
want to add a button to the same form as the buttons that are hard-coded in
the design. Because that form is not created until runtime, I have no way to
know what it will be named (it has been given the name "Form1" when I "View
Source" from my browser, but how do I know that will not be changed?). Is
their a way to refer to this main form without using a name? Thanks.
--
Nathan Sokalski
[email]njsokalski@hotmail.com[/email]
[url]http://www.nathansokalski.com/[/url]

"gabe garza" <gbgarza@yahoo.com> wrote in message
news:BCahe.16497$J12.2805@newssvr14.news.prodigy.c om...

> You Add() to an instance of System.Web.UI.HtmlControls.HtmlForm for
> BUTTONS.
> When you use "Me" that's the PAGE not a FORM.
>
> If you have a FORM on your PAGE called:
> Protected WithEvents Form1 As System.Web.UI.HtmlControls.HtmlForm
>
> Then you'd add BUTTON controls using:
> Dim extrabutton As Button = New Button
> extrabutton.Text = "Generated Button"
> Form1.Controls.Add(extrabutton)
>
>
> "Nathan Sokalski" <njsokalski@hotmail.com> wrote in message
> news:OOrSAWAWFHA.2196@TK2MSFTNGP09.phx.gbl...

>>I am trying to dynamically add controls to my page, but am having trouble
>>with controls such as buttons. I have been able to add simple controls
>>such as Label controls, because they can be placed anywhere. I have
>>managed to add Labels using the following code:
>>
>> Dim extralabel As Label = New Label
>>
>> extralabel.Text = "Generated Label"
>>
>> Me.Controls.Add(extralabel)
>>
>>
>> This places the label at the very end of the generated code inside SPAN
>> tags. However, when I try something similar with a Button control using
>> the following code:
>>
>> Dim extrabutton As Button = New Button
>>
>> extrabutton.Text = "Generated Button"
>>
>> Me.Controls.Add(extrabutton)
>>
>> I recieve an error telling me that a Button control must be between FORM
>> tags (which makes sense, since a Button control generates an INPUT tag).
>> I am having trouble figuring out how to add the Button control so that it
>> is between the form tags. Does anyone know how to do this? A simple
>> example would be nice. Any help would be appreciated. Thanks.
>> --
>> Nathan Sokalski
>> [email]njsokalski@hotmail.com[/email]
>> [url]http://www.nathansokalski.com/[/url]
>>

>
>

[Martin]

In the PageLoad event u can add controls to the form or some
placeholder(preferred)

after the main PageLoad event the load events for each added control are
fired

No trouble with rendering at this points

hope this helps
Martin

"Nathan Sokalski" <njsokalski@hotmail.com> schreef in bericht
news:%23X5nsdBWFHA.2424@TK2MSFTNGP10.phx.gbl...

> That sounds like it would work when I already have a named form, but I
> just want to add a button to the same form as the buttons that are
> hard-coded in the design. Because that form is not created until runtime,
> I have no way to know what it will be named (it has been given the name
> "Form1" when I "View Source" from my browser, but how do I know that will
> not be changed?). Is their a way to refer to this main form without using
> a name? Thanks.
> --
> Nathan Sokalski
> [email]njsokalski@hotmail.com[/email]
> [url]http://www.nathansokalski.com/[/url]
>
> "gabe garza" <gbgarza@yahoo.com> wrote in message
> news:BCahe.16497$J12.2805@newssvr14.news.prodigy.c om...

>> You Add() to an instance of System.Web.UI.HtmlControls.HtmlForm for
>> BUTTONS.
>> When you use "Me" that's the PAGE not a FORM.
>>
>> If you have a FORM on your PAGE called:
>> Protected WithEvents Form1 As System.Web.UI.HtmlControls.HtmlForm
>>
>> Then you'd add BUTTON controls using:
>> Dim extrabutton As Button = New Button
>> extrabutton.Text = "Generated Button"
>> Form1.Controls.Add(extrabutton)
>>
>>
>> "Nathan Sokalski" <njsokalski@hotmail.com> wrote in message
>> news:OOrSAWAWFHA.2196@TK2MSFTNGP09.phx.gbl...

>>>I am trying to dynamically add controls to my page, but am having trouble
>>>with controls such as buttons. I have been able to add simple controls
>>>such as Label controls, because they can be placed anywhere. I have
>>>managed to add Labels using the following code:
>>>
>>> Dim extralabel As Label = New Label
>>>
>>> extralabel.Text = "Generated Label"
>>>
>>> Me.Controls.Add(extralabel)
>>>
>>>
>>> This places the label at the very end of the generated code inside SPAN
>>> tags. However, when I try something similar with a Button control using
>>> the following code:
>>>
>>> Dim extrabutton As Button = New Button
>>>
>>> extrabutton.Text = "Generated Button"
>>>
>>> Me.Controls.Add(extrabutton)
>>>
>>> I recieve an error telling me that a Button control must be between FORM
>>> tags (which makes sense, since a Button control generates an INPUT tag).
>>> I am having trouble figuring out how to add the Button control so that
>>> it is between the form tags. Does anyone know how to do this? A simple
>>> example would be nice. Any help would be appreciated. Thanks.
>>> --
>>> Nathan Sokalski
>>> [email]njsokalski@hotmail.com[/email]
>>> [url]http://www.nathansokalski.com/[/url]
>>>

>>
>>

>
>

[gabe garza]

If Visual Studio 2003 look in your aspx code behind (whatever.aspx.vb) for
the following section
#Region " Web Form Designer Generated Code "

Once you locate it see if you see a HtmlForm entry like the following:
Protected WithEvents Form1 As System.Web.UI.HtmlControls.HtmlForm

If not, then you need to look at your ASPX page (whatever.aspx) and view it
in HTML not in DESIGN.
Locate for your <form> tag, once you see it does it have a ID attribute. If
not add one. If you name it as follows:
<form id="Form1" name="Form1" method="post" runat="server">

Then go back to your code behind (whatever.aspx.vb) in the #Region section
and add the following:
Protected WithEvents Form1 As System.Web.UI.HtmlControls.HtmlForm

Once you do that add the following code in your Page_Load() Event
Dim extrabutton As Button = New Button
extrabutton.Text = "Generated Button"
Form1.Controls.Add(extrabutton)

That will add your BUTTON dynamicly.

Your FORM called Form1 is now associated with your "hard coded" controls
built with the designer as well as your dynamic control you added with VB.

I just tried it to an existing application I have and it does work.
If you have problems please post your code.


"Nathan Sokalski" <njsokalski@hotmail.com> wrote in message
news:%23X5nsdBWFHA.2424@TK2MSFTNGP10.phx.gbl...

> That sounds like it would work when I already have a named form, but I
> just want to add a button to the same form as the buttons that are
> hard-coded in the design. Because that form is not created until runtime,
> I have no way to know what it will be named (it has been given the name
> "Form1" when I "View Source" from my browser, but how do I know that will
> not be changed?). Is their a way to refer to this main form without using
> a name? Thanks.
> --
> Nathan Sokalski
> [email]njsokalski@hotmail.com[/email]
> [url]http://www.nathansokalski.com/[/url]
>
> "gabe garza" <gbgarza@yahoo.com> wrote in message
> news:BCahe.16497$J12.2805@newssvr14.news.prodigy.c om...

>> You Add() to an instance of System.Web.UI.HtmlControls.HtmlForm for
>> BUTTONS.
>> When you use "Me" that's the PAGE not a FORM.
>>
>> If you have a FORM on your PAGE called:
>> Protected WithEvents Form1 As System.Web.UI.HtmlControls.HtmlForm
>>
>> Then you'd add BUTTON controls using:
>> Dim extrabutton As Button = New Button
>> extrabutton.Text = "Generated Button"
>> Form1.Controls.Add(extrabutton)
>>
>>
>> "Nathan Sokalski" <njsokalski@hotmail.com> wrote in message
>> news:OOrSAWAWFHA.2196@TK2MSFTNGP09.phx.gbl...

>>>I am trying to dynamically add controls to my page, but am having trouble
>>>with controls such as buttons. I have been able to add simple controls
>>>such as Label controls, because they can be placed anywhere. I have
>>>managed to add Labels using the following code:
>>>
>>> Dim extralabel As Label = New Label
>>>
>>> extralabel.Text = "Generated Label"
>>>
>>> Me.Controls.Add(extralabel)
>>>
>>>
>>> This places the label at the very end of the generated code inside SPAN
>>> tags. However, when I try something similar with a Button control using
>>> the following code:
>>>
>>> Dim extrabutton As Button = New Button
>>>
>>> extrabutton.Text = "Generated Button"
>>>
>>> Me.Controls.Add(extrabutton)
>>>
>>> I recieve an error telling me that a Button control must be between FORM
>>> tags (which makes sense, since a Button control generates an INPUT tag).
>>> I am having trouble figuring out how to add the Button control so that
>>> it is between the form tags. Does anyone know how to do this? A simple
>>> example would be nice. Any help would be appreciated. Thanks.
>>> --
>>> Nathan Sokalski
>>> [email]njsokalski@hotmail.com[/email]
>>> [url]http://www.nathansokalski.com/[/url]
>>>

>>
>>

>
>

[treilly]

Hi all,
I currently have a datagrid with a buttoncolumn and a few other boundcolumns.
Once a user clicks on a button in the buttoncolumn, I need to remove that
control and put another control in it's place. I am having no luck
whatsoever in doing this. I have made a new LinkButton in my code-behind (C#)
and have tried adding it to the calling row (e.item.cells[0].controls.add
(newControl)) - this seems to work as far as placing the control there.
However, once I click on it the event does not fire. I've tried a Click
event, a Command event - neither of those worked. What I really need is for
it to fire an event where I can get the DataGridCommandEventArgs for the
particular row that was clicked. I tried adding the control to the Datagrid,
but my button ends up outside the table (probably because I don't know how to
tell it to put it in the right place).

So I suppose my question would be:
Is there a way to add a linkbutton in the code-behind to a datagrid such that
it will raise the ItemClick event (and I will be able to get the
DataGridCommandEventArgs from it)?

Thanks in advance.
-TR

--
Message posted via DotNetMonster.com
[url]http://www.dotnetmonster.com/Uwe/Forums.aspx/asp-net-datagrid/200511/1[/url]

[SundeepP]

What you could also do is use the syntax (assume the name of your form
in the ASPX file is Form1)in C#:

HtmlForm form1 = this.FindControl("Form1") as HtmlForm;

This gives you a handle to the form and you add controls dynamically to
the form's controls collection.

It also doesn't force you to place an unneccesary placeholder control.


Hope this helps.



--
SundeepP
------------------------------------------------------------------------
Posted via [url]http://www.codecomments.com[/url]
------------------------------------------------------------------------

[S.M. Altaf [MVP]]

Are you handling the ItemCommand event?
--------------------------------------------------------------------------------
All that glitters has a high refractive index.
[url]www.mendhak.com[/url]

"treilly" <u15154@uwe> wrote in message news:57b35027a5184@uwe...

> Hi all,
> I currently have a datagrid with a buttoncolumn and a few other
> boundcolumns.
> Once a user clicks on a button in the buttoncolumn, I need to remove that
> control and put another control in it's place. I am having no luck
> whatsoever in doing this. I have made a new LinkButton in my code-behind
> (C#)
> and have tried adding it to the calling row (e.item.cells[0].controls.add
> (newControl)) - this seems to work as far as placing the control there.
> However, once I click on it the event does not fire. I've tried a Click
> event, a Command event - neither of those worked. What I really need is
> for
> it to fire an event where I can get the DataGridCommandEventArgs for the
> particular row that was clicked. I tried adding the control to the
> Datagrid,
> but my button ends up outside the table (probably because I don't know how
> to
> tell it to put it in the right place).
>
> So I suppose my question would be:
> Is there a way to add a linkbutton in the code-behind to a datagrid such
> that
> it will raise the ItemClick event (and I will be able to get the
> DataGridCommandEventArgs from it)?
>
> Thanks in advance.
> -TR
>
> --
> Message posted via DotNetMonster.com
> [url]http://www.dotnetmonster.com/Uwe/Forums.aspx/asp-net-datagrid/200511/1[/url]