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aspx thread: Placing a control dynamically onto a page...
Message #1 by "Al LeMay" <alemay@d...> on Tue, 20 Nov 2001 11:35:58 -0800
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All
I have a web form that has no controls on it. On page_load() it goes to
a database and retrieves a set of records. The records are then placed
onto Labels and RadioButtons, and then dynamically added to the page
through the Controls.Add() method. Now here is the stickler, is there
any "easy way" to position the controls?
I am currently pondering writing the entire mess as HTML code to a
buffer. Then reading the buffer to format the page. But one problem, I
do not know how large to make the buffer. I could make it some arbitrary
length, but then I may over run it. Or not completely fill it, wasting
memory.
So are there any ideas out there on this?
Much appreciated.
Al LeMay
Virtuoso, Ltd.
Quality Assurance Manager
alemay@d...
tele: (xxx) xxx-xxxx
cell: (xxx) xxx-xxxx
http://www.virtuoso.com/
"Be joyful always; pray continually; give thanks in all circumstances."
- 1 Thessalonians 5:18
Message #2 by Jeri Lamy <jlamy@2...> on Tue, 20 Nov 2001 13:11:39 -0700
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By using the Style property of the controls, you can set a string that can
include positioning, like so:
protected System.Web.UI.WebControls.LinkButton Add;
Add.Style = "position:absolute; left:25px; top:10px";
You can put anything in the Style property just like you normally would with
a regular HTML or DHTML control.
There are, however, other issues you may want to consider when dynamically
creating controls through code. For instance, anything created in code must
be created EVERY TIME you postback the page. You cannot check the
IsPostback property in the Page_Load and only load them the first
time...they will disappear when you postback the page then. In the IBuySpy
demo, they load the dynamic controls in the Page_Init function, and they are
loaded every time. The other problem that this presents is, if you are
wanting to do a postback to SAVE data that may have been updated in your
dynamically created controls, this will not work...because the dynamic
controls are not persisted on postback.
If this doesn't present problems for what you are trying to do, you should
still create them in the Page_Init function. If you create them in
Page_Load, any events that you want to hook to server controls will not be
wired. At least, I couldn't get them to fire.
Jeri Lamy
Sr. Programmer
-----Original Message-----
From: Al LeMay [mailto:alemay@d...]
Sent: Tuesday, November 20, 2001 12:36 PM
To: ASP+
Subject: [aspx] Placing a control dynamically onto a page...
All
I have a web form that has no controls on it. On page_load() it goes to a
database and retrieves a set of records. The records are then placed onto
Labels and RadioButtons, and then dynamically added to the page through the
Controls.Add() method. Now here is the stickler, is there any "easy way" to
position the controls?
I am currently pondering writing the entire mess as HTML code to a buffer.
Then reading the buffer to format the page. But one problem, I do not know
how large to make the buffer. I could make it some arbitrary length, but
then I may over run it. Or not completely fill it, wasting memory.
So are there any ideas out there on this?
Much appreciated.
Al LeMay
Virtuoso, Ltd.
Quality Assurance Manager
alemay@d...
tele: (xxx) xxx-xxxx
cell: (xxx) xxx-xxxx
<http://www.virtuoso.com/> http://www.virtuoso.com/
"Be joyful always; pray continually; give thanks in all circumstances."
- 1 Thessalonians 5:18
Message #3 by "Samuel Engelman" <samuel_engelman@p...> on Tue, 20 Nov 2001 15:28:12 -0500
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can you build an asp:table and dynamicaly put the controls in the cell
of the
table?
|--------+--------------------------------->
| | "Al LeMay" |
| | <alemay@d...> |
| | |
| | |
| | Tuesday November 20, 2001 |
| | 02:35 PM |
| | Please respond to "ASP+" |
| | |
|--------+--------------------------------->
>------------------------------------------------------------|
| |
| To: "ASP+" |
| <aspx@p...> |
| cc: |
| Subject: [aspx] Placing a control dynamically onto a |
| page... |
>------------------------------------------------------------|
All
I have a web form that has no controls on it. On page_load() it goes to
a
database and retrieves a set of records. The records are then placed on
to Labels
and RadioButtons, and then dynamically added to the page through the
Controls.Add() method.=A0 Now here is the stickler, is there any "easy
way" to
position the controls?
I am currently pondering writing the entire mess as HTML code to a buff
er.=A0 Then
reading the buffer to format the page.=A0 But one problem, I do not kno
w how large
to make the buffer. I could make it some arbitrary length, but then I m
ay over
run it. Or not completely fill it, wasting memory.
So are there any ideas out there on this?
Much appreciated.
Al LeMay
Virtuoso, Ltd.
Quality Assurance Manager
alemay@d...
tele: (xxx) xxx-xxxx
cell: (xxx) xxx-xxxx
http://www.virtuoso.com/
"Be joyful always; pray continually; give thanks in all circumstances."
- 1 Thessalonians 5:18
---
VBug Winter Conference 2001
Open Forum: Dan Appleman will be hosting an open
forum at The .NET Developer's Conference on
29th November 2001. The session will give
developers the chance to discuss and question
Dan on his experience with the .NET environment.
Dan has been programming Visual Basic since the
alpha version 1.0. And with over 10 years
Visual Basic experience is well qualified to
help you on your road to being a .NET Guru.
http://www.vbug.co.uk/redirect.asp?url=3D39&id=3D17
---
You are currently subscribed to
aspx as: Samuel_Engelman@p...
$subst('Email.Unsub')
Message #4 by "Mark A. Struck" <mstruck@s...> on Tue, 20 Nov 2001 14:24:09 -0600
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If you have groups of controls you can put them in a placeholder
control. That way you only have to position the placeholder instead of
all the individual controls. Jeri is correct about the controls keeping
state. I store the state of my controls in XML that I store in
ViewState["State"], which gets stored in the page, this way everytime
the page gets loaded I can rebuild the controls from the XML.
Mark
-----Original Message-----
From: Jeri Lamy [mailto:jlamy@2...]
Sent: Tuesday, November 20, 2001 2:12 PM
To: ASP+
Subject: [aspx] RE: Placing a control dynamically onto a page...
By using the Style property of the controls, you can set a string that
can include positioning, like so:
protected System.Web.UI.WebControls.LinkButton Add;
Add.Style =3D "position:absolute; left:25px; top:10px";
You can put anything in the Style property just like you normally would
with a regular HTML or DHTML control.
There are, however, other issues you may want to consider when
dynamically creating controls through code. For instance, anything
created in code must be created EVERY TIME you postback the page. You
cannot check the IsPostback property in the Page_Load and only load them
the first time...they will disappear when you postback the page then.
In the IBuySpy demo, they load the dynamic controls in the Page_Init
function, and they are loaded every time. The other problem that this
presents is, if you are wanting to do a postback to SAVE data that may
have been updated in your dynamically created controls, this will not
work...because the dynamic controls are not persisted on postback.
If this doesn't present problems for what you are trying to do, you
should still create them in the Page_Init function. If you create them
in Page_Load, any events that you want to hook to server controls will
not be wired. At least, I couldn't get them to fire.
Jeri Lamy
Sr. Programmer
-----Original Message-----
From: Al LeMay [mailto:alemay@d...]
Sent: Tuesday, November 20, 2001 12:36 PM
To: ASP+
Subject: [aspx] Placing a control dynamically onto a page...
All
I have a web form that has no controls on it. On page_load() it goes to
a database and retrieves a set of records. The records are then placed
onto Labels and RadioButtons, and then dynamically added to the page
through the Controls.Add() method. Now here is the stickler, is there
any "easy way" to position the controls?
I am currently pondering writing the entire mess as HTML code to a
buffer. Then reading the buffer to format the page. But one problem, I
do not know how large to make the buffer. I could make it some arbitrary
length, but then I may over run it. Or not completely fill it, wasting
memory.
So are there any ideas out there on this?
Much appreciated.
Al LeMay
Virtuoso, Ltd.
Quality Assurance Manager
alemay@d...
tele: (xxx) xxx-xxxx
cell: (xxx) xxx-xxxx
<http://www.virtuoso.com/> http://www.virtuoso.com/
"Be joyful always; pray continually; give thanks in all circumstances."
- 1 Thessalonians 5:18
---
VBug Winter Conference 2001
Open Forum: Dan Appleman will be hosting an open
forum at The .NET Developer's Conference on
29th November 2001. The session will give
developers the chance to discuss and question
Dan on his experience with the .NET environment.
Dan has been programming Visual Basic since the
alpha version 1.0. And with over 10 years
Visual Basic experience is well qualified to
help you on your road to being a .NET Guru.
http://www.vbug.co.uk/redirect.asp?url=3D39&id=3D17
---
You are currently subscribed to
aspx as: struckm@a...
$subst('Email.Unsub')
Message #5 by "Mark A. Struck" <mstruck@s...> on Tue, 20 Nov 2001 14:30:18 -0600
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Yes you can. Create the TableCell object and then
objTableCell.Controls.Add(control).
Mark
-----Original Message-----
From: Samuel Engelman [mailto:samuel_engelman@p...]
Sent: Tuesday, November 20, 2001 2:28 PM
To: ASP+
Subject: [aspx] Re: Placing a control dynamically onto a page...
can you build an asp:table and dynamicaly put the controls in the cell
of the
table?
|--------+--------------------------------->
| | "Al LeMay" |
| | <alemay@d...> |
| | |
| | |
| | Tuesday November 20, 2001 |
| | 02:35 PM |
| | Please respond to "ASP+" |
| | |
|--------+--------------------------------->
>------------------------------------------------------------|
| |
| To: "ASP+" |
| <aspx@p...> |
| cc: |
| Subject: [aspx] Placing a control dynamically onto a |
| page... |
>------------------------------------------------------------|
All
I have a web form that has no controls on it. On page_load() it goes to
a
database and retrieves a set of records. The records are then placed
onto Labels
and RadioButtons, and then dynamically added to the page through the
Controls.Add() method.=A0 Now here is the stickler, is there any "easy
way" to
position the controls?
I am currently pondering writing the entire mess as HTML code to a
buffer.=A0 Then
reading the buffer to format the page.=A0 But one problem, I do not know
how large
to make the buffer. I could make it some arbitrary length, but then I
may over
run it. Or not completely fill it, wasting memory.
So are there any ideas out there on this?
Much appreciated.
Al LeMay
Virtuoso, Ltd.
Quality Assurance Manager
alemay@d...
tele: (xxx) xxx-xxxx
cell: (xxx) xxx-xxxx
http://www.virtuoso.com/
"Be joyful always; pray continually; give thanks in all circumstances."
- 1 Thessalonians 5:18
---
VBug Winter Conference 2001
Open Forum: Dan Appleman will be hosting an open
forum at The .NET Developer's Conference on
29th November 2001. The session will give
developers the chance to discuss and question
Dan on his experience with the .NET environment.
Dan has been programming Visual Basic since the
alpha version 1.0. And with over 10 years
Visual Basic experience is well qualified to
help you on your road to being a .NET Guru.
http://www.vbug.co.uk/redirect.asp?url=3D39&id=3D17
---
You are currently subscribed to
aspx as: Samuel_Engelman@p...
$subst('Email.Unsub')
---
VBug Winter Conference 2001
Open Forum: Dan Appleman will be hosting an open
forum at The .NET Developer's Conference on
29th November 2001. The session will give
developers the chance to discuss and question
Dan on his experience with the .NET environment.
Dan has been programming Visual Basic since the
alpha version 1.0. And with over 10 years
Visual Basic experience is well qualified to
help you on your road to being a .NET Guru.
http://www.vbug.co.uk/redirect.asp?url=3D39&id=3D17
---
You are currently subscribed to
aspx as: struckm@a...
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