hidden field

[Guest]

Hi,

I need to read an hidden field on the server side (code behind). I can
modify the value in Javascript (client side), then call "form.submit();" on
the client side. However, on the server side the value is empty. Any idea on
the best way to set a hidden field on the client side and read its value on
the server side?

Thanks.
Mike

 

[=?iso-8859-1?Q?Anders_Nor=E5s?=]

Add a runat="server" attribute to your input tag. Like
this:
<INPUT type="hidden" id="MyHiddenField" runat="server">
The runat="server" attribute enables you to access the
field from your code-behind class. Like this:
HtmlInputHidden hidden=(HtmlInputHidden) Page.FindControl
("MyHidden");

Regards,
Anders Norås - blog:
http://dotnetjunkies.com/weblog/anoras

 

[Guest]

It did not work. I still have an empty "value". Here is the code I have that
triggers the form submittal:

this.MyButton.Attributes["onclick"] =
"javascript:FromControl.value=\"MyButton\"; __doPostBack('','');";

I also tried with "form.submit()" in javascript, but the value is alway
empty. Any suggestion?

Thanks.
Mike

 

[Eliyahu Goldin]

Mike,

runat=server is good enough. After this you get on the server what you set
on the client. If you are getting empty, it must for the reason you are
setting empty. Check your client code. Are you sure FromControl is found?
You might have to write document.getElementById("FromControl").

Eliyahu

It did not work. I still have an empty "value". Here is the code I have that
triggers the form submittal:

this.MyButton.Attributes["onclick"] =
"javascript:FromControl.value=\"MyButton\"; __doPostBack('','');";

I also tried with "form.submit()" in javascript, but the value is alway
empty. Any suggestion?

Thanks.
Mike

Add a runat="server" attribute to your input tag. Like
this:
<INPUT type="hidden" id="MyHiddenField" runat="server">
The runat="server" attribute enables you to access the
field from your code-behind class. Like this:
HtmlInputHidden hidden=(HtmlInputHidden) Page.FindControl
("MyHidden");

Regards,
Anders Norås - blog:
http://dotnetjunkies.com/weblog/anoras

 

[Guest]

Hi Eliyahu,

I found the problem. I have nested forms in my page and the hidden control
was not in the form. Although the javascript did work, the value was not
posted back.

Thanks everyone!
Mike

Mike,

runat=server is good enough. After this you get on the server what you set
on the client. If you are getting empty, it must for the reason you are
setting empty. Check your client code. Are you sure FromControl is found?
You might have to write document.getElementById("FromControl").

Eliyahu

It did not work. I still have an empty "value". Here is the code I have that
triggers the form submittal:

this.MyButton.Attributes["onclick"] =
"javascript:FromControl.value=\"MyButton\"; __doPostBack('','');";

I also tried with "form.submit()" in javascript, but the value is alway
empty. Any suggestion?

Thanks.
Mike

Add a runat="server" attribute to your input tag. Like
this:
<INPUT type="hidden" id="MyHiddenField" runat="server">
The runat="server" attribute enables you to access the
field from your code-behind class. Like this:
HtmlInputHidden hidden=(HtmlInputHidden) Page.FindControl
("MyHidden");

Regards,
Anders Norås - blog:
http://dotnetjunkies.com/weblog/anoras
-----Original Message-----

Hi,

I need to read an hidden field on the server side (code
behind). I can
modify the value in Javascript (client side), then
call "form.submit();" on
the client side. However, on the server side the value
is empty. Any idea on
the best way to set a hidden field on the client side
and read its value on
the server side?

Thanks.
Mike


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