Disable button's "submit" behavior

[GD]

Hi,
I wonder how to disable the "submit" behavior of a button. What I want is to
assign values to dynamically added user controls without page postback.

Problem: dynamically created control can not be accessed because the button
click trigers page postback(see sample code). When the button is clicked, an
error occurs: "System.NullReferenceException: Object reference not set to an
instance of an object."

Please help. Thanks.

GD
public class WebForm1 : System.Web.UI.Page
{
protected System.Web.UI.WebControls.Panel Panel1;
protected System.Web.UI.WebControls.Button Button1;
public WebUserControl1 userCtl;

private void Page_Load(object sender, System.EventArgs e)
{
if (!Page.IsPostBack)
{
for (int i = 0; i < 5; i++)
{
userCtl = (WebUserControl1) LoadControl("WebUserControl1.ascx");
userCtl.ID = "ID" + i;
Panel1.Controls.Add(userCtl);
}
}
}

private void Button1_Click(object sender, System.EventArgs e)
{
userCtl = (WebUserControl1)FindControl("ID2");
userCtl.ctlValue = "test it";
}
}

[Girish bharadwaj]

Can you not test for Page.IsPostBack for loading the "dynamic" controls. That might be cause of the problem?

--
Girish Bharadwaj
http://msmvps.com/gbvb

Hi,
I wonder how to disable the "submit" behavior of a button. What I want
is to
assign values to dynamically added user controls without page
postback.
Problem: dynamically created control can not be accessed because the
button click trigers page postback(see sample code). When the button
is clicked, an error occurs: "System.NullReferenceException: Object
reference not set to an instance of an object."

Please help. Thanks.

GD

public class WebForm1 : System.Web.UI.Page
{
protected System.Web.UI.WebControls.Panel Panel1;
protected System.Web.UI.WebControls.Button Button1;
public WebUserControl1 userCtl;
private void Page_Load(object sender, System.EventArgs e)
{
if (!Page.IsPostBack)
{
for (int i = 0; i < 5; i++)
{
userCtl = (WebUserControl1) LoadControl("WebUserControl1.ascx");
userCtl.ID = "ID" + i;
Panel1.Controls.Add(userCtl);
}
}
}
private void Button1_Click(object sender, System.EventArgs e)
{
userCtl = (WebUserControl1)FindControl("ID2");
userCtl.ctlValue = "test it";
}
}

[Hermit Dave]

if you want to disble a submit behavior. i understand your requirement, you
do not want server side postback.

if you are using buttons of webcontrols type then you could set enabled =
falsel
otherwise consider using the html control <input type=button name="myButton"
id="myButton value="button title">

--

Regards,

Hermit Dave
(http://hdave.blogspot.com)
"GD" <ge*********@comcast.net> wrote in message
news:uF*************@tk2msftngp13.phx.gbl...

Hi,
I wonder how to disable the "submit" behavior of a button. What I want is to assign values to dynamically added user controls without page postback.

Problem: dynamically created control can not be accessed because the button click trigers page postback(see sample code). When the button is clicked, an error occurs: "System.NullReferenceException: Object reference not set to an instance of an object."

Please help. Thanks.

GD
public class WebForm1 : System.Web.UI.Page
{
protected System.Web.UI.WebControls.Panel Panel1;
protected System.Web.UI.WebControls.Button Button1;
public WebUserControl1 userCtl;

private void Page_Load(object sender, System.EventArgs e)
{
if (!Page.IsPostBack)
{
for (int i = 0; i < 5; i++)
{
userCtl = (WebUserControl1) LoadControl("WebUserControl1.ascx");
userCtl.ID = "ID" + i;
Panel1.Controls.Add(userCtl);
}
}
}

private void Button1_Click(object sender, System.EventArgs e)
{
userCtl = (WebUserControl1)FindControl("ID2");
userCtl.ctlValue = "test it";
}
}

[GD]

Yes, I have to initialize the first group of controls under
!Page.IsPostBack, and then generate another group of controls based on the
values in the first group (in dropdown box).

"Girish bharadwaj" <gi*****@mvps.org> wrote in message
news:ul**************@TK2MSFTNGP09.phx.gbl...

Can you not test for Page.IsPostBack for loading the "dynamic" controls.
That might be cause of the problem?

--
Girish Bharadwaj
http://msmvps.com/gbvb

Hi,
I wonder how to disable the "submit" behavior of a button. What I want
is to
assign values to dynamically added user controls without page
postback.
Problem: dynamically created control can not be accessed because the
button click trigers page postback(see sample code). When the button
is clicked, an error occurs: "System.NullReferenceException: Object
reference not set to an instance of an object."

Please help. Thanks.

GD

public class WebForm1 : System.Web.UI.Page
{
protected System.Web.UI.WebControls.Panel Panel1;
protected System.Web.UI.WebControls.Button Button1;
public WebUserControl1 userCtl;
private void Page_Load(object sender, System.EventArgs e)
{
if (!Page.IsPostBack)
{
for (int i = 0; i < 5; i++)
{
userCtl = (WebUserControl1) LoadControl("WebUserControl1.ascx");
userCtl.ID = "ID" + i;
Panel1.Controls.Add(userCtl);
}
}
}
private void Button1_Click(object sender, System.EventArgs e)
{
userCtl = (WebUserControl1)FindControl("ID2");
userCtl.ctlValue = "test it";
}
}

[GD]

'set enabled = false' simply disables the button. How can I access the
server controls using Html buttons? By client javascript?

"Hermit Dave" <he************@CAPS.AND.DOTS.hotmail.com> wrote in message
news:%2****************@TK2MSFTNGP15.phx.gbl...

if you want to disble a submit behavior. i understand your requirement,
you
do not want server side postback.

if you are using buttons of webcontrols type then you could set enabled =
falsel
otherwise consider using the html control <input type=button
name="myButton"
id="myButton value="button title">

--

Regards,

Hermit Dave
(http://hdave.blogspot.com)
"GD" <ge*********@comcast.net> wrote in message
news:uF*************@tk2msftngp13.phx.gbl...

Hi,
I wonder how to disable the "submit" behavior of a button. What I want is

to

assign values to dynamically added user controls without page postback.

Problem: dynamically created control can not be accessed because the

button

click trigers page postback(see sample code). When the button is clicked,

an

error occurs: "System.NullReferenceException: Object reference not set to

an

instance of an object."

Please help. Thanks.

GD
public class WebForm1 : System.Web.UI.Page
{
protected System.Web.UI.WebControls.Panel Panel1;
protected System.Web.UI.WebControls.Button Button1;
public WebUserControl1 userCtl;

private void Page_Load(object sender, System.EventArgs e)
{
if (!Page.IsPostBack)
{
for (int i = 0; i < 5; i++)
{
userCtl = (WebUserControl1) LoadControl("WebUserControl1.ascx");
userCtl.ID = "ID" + i;
Panel1.Controls.Add(userCtl);
}
}
}

private void Button1_Click(object sender, System.EventArgs e)
{
userCtl = (WebUserControl1)FindControl("ID2");
userCtl.ctlValue = "test it";
}
}

[Hermit Dave]

have a look at the rendered html. you will have to rely on javascript to
disable the submit for you.
you will need to access the buttons using the rendered name to disable them.

i would advise you to use htmlcontrols and specify a proper name for which
writing javascript should be a lot easier.

--

Regards,

Hermit Dave
(http://hdave.blogspot.com)
"GD" <ge*********@comcast.net> wrote in message
news:#O**************@TK2MSFTNGP10.phx.gbl...

'set enabled = false' simply disables the button. How can I access the
server controls using Html buttons? By client javascript?

"Hermit Dave" <he************@CAPS.AND.DOTS.hotmail.com> wrote in message
news:%2****************@TK2MSFTNGP15.phx.gbl...

if you want to disble a submit behavior. i understand your requirement,
you
do not want server side postback.

if you are using buttons of webcontrols type then you could set enabled = falsel
otherwise consider using the html control <input type=button
name="myButton"
id="myButton value="button title">

--

Regards,

Hermit Dave
(http://hdave.blogspot.com)
"GD" <ge*********@comcast.net> wrote in message
news:uF*************@tk2msftngp13.phx.gbl...

Hi,
I wonder how to disable the "submit" behavior of a button. What I want

is to

assign values to dynamically added user controls without page postback.

Problem: dynamically created control can not be accessed because the

button

click trigers page postback(see sample code). When the button is

clicked, an

error occurs: "System.NullReferenceException: Object reference not set

to an

instance of an object."

Please help. Thanks.

GD
public class WebForm1 : System.Web.UI.Page
{
protected System.Web.UI.WebControls.Panel Panel1;
protected System.Web.UI.WebControls.Button Button1;
public WebUserControl1 userCtl;

private void Page_Load(object sender, System.EventArgs e)
{
if (!Page.IsPostBack)
{
for (int i = 0; i < 5; i++)
{
userCtl = (WebUserControl1) LoadControl("WebUserControl1.ascx");
userCtl.ID = "ID" + i;
Panel1.Controls.Add(userCtl);
}
}
}

private void Button1_Click(object sender, System.EventArgs e)
{
userCtl = (WebUserControl1)FindControl("ID2");
userCtl.ctlValue = "test it";
}
}

[Girish bharadwaj]

Can you add a client side javascript that returns false for click() and add that as the OnClick() handler for the new buttons.
Would that help?

<script>
function onClick() {
return false;
}
</script>

in the client side html.
btn.Attributes.Add("onclick","onClick();"); on your server side code..
would that help you?

--
Girish Bharadwaj
http://msmvps.com/gbvb

Yes, I have to initialize the first group of controls under
!Page.IsPostBack, and then generate another group of controls based on
the values in the first group (in dropdown box).

"Girish bharadwaj" <gi*****@mvps.org> wrote in message
news:ul**************@TK2MSFTNGP09.phx.gbl...

Can you not test for Page.IsPostBack for loading the "dynamic"
controls. That might be cause of the problem?

--
Girish Bharadwaj
http://msmvps.com/gbvb

Hi,
I wonder how to disable the "submit" behavior of a button. What I
want
is to
assign values to dynamically added user controls without page
postback.
Problem: dynamically created control can not be accessed because the
button click trigers page postback(see sample code). When the
button
is clicked, an error occurs: "System.NullReferenceException: Object
reference not set to an instance of an object."
Please help. Thanks.

GD

public class WebForm1 : System.Web.UI.Page
{
protected System.Web.UI.WebControls.Panel Panel1;
protected System.Web.UI.WebControls.Button Button1;
public WebUserControl1 userCtl;
private void Page_Load(object sender, System.EventArgs e)
{
if (!Page.IsPostBack)
{
for (int i = 0; i < 5; i++)
{
userCtl = (WebUserControl1) LoadControl("WebUserControl1.ascx");
userCtl.ID = "ID" + i;
Panel1.Controls.Add(userCtl);
}
}
}
private void Button1_Click(object sender, System.EventArgs e)
{
userCtl = (WebUserControl1)FindControl("ID2");
userCtl.ctlValue = "test it";
}
}