doPostBack client-side function

[Johno]

Whenever you drop a linkbutton on an ASP.NET web form,
the following script gets emitted:

function __doPostBack(eventTarget, eventArgument) {
var theform = document.Form1;
theform.__EVENTTARGET.value = eventTarget;
theform.__EVENTARGUMENT.value =
eventArgument;
theform.submit();
}

However, when I check the call to __doPostBack() executed
when the linkbutton is checked, only the eventTarget
argument is specified, even though the linkbutton has
it's CommandArgument property set.

What's the purpose of the .__EVENTARGUMENT field in
relation to server-side postback controls?

TIA

John

[Marina]

__doPostBack is the generic asp.net generated function to cause postbacks.
Perhaps other controls that use it do have a reason to use the
__eventargument field.

"Johno" <ltj__bukem@hotmail.com> wrote in message
news:001f01c34d47$6ab94790$a401280a@phx.gbl...

> Whenever you drop a linkbutton on an ASP.NET web form,
> the following script gets emitted:
>
> function __doPostBack(eventTarget, eventArgument) {
> var theform = document.Form1;
> theform.__EVENTTARGET.value = eventTarget;
> theform.__EVENTARGUMENT.value =
> eventArgument;
> theform.submit();
> }
>
> However, when I check the call to __doPostBack() executed
> when the linkbutton is checked, only the eventTarget
> argument is specified, even though the linkbutton has
> it's CommandArgument property set.
>
> What's the purpose of the .__EVENTARGUMENT field in
> relation to server-side postback controls?
>
> TIA
>
> John

[Teemu Keiski]

For example controls that implement IPostBackEventHandler interface can send
arguments for postback processing. Some action might vary based on which
argument has been sent for the particular control. For example
implementation of Next/Prev buttons in a custom control.

--
Teemu Keiski
MCP, Designer/Developer
Mansoft tietotekniikka Oy
[url]http://www.mansoft.fi[/url]

AspInsiders Member, [url]www.aspinsiders.com[/url]
ASP.NET Forums Moderator, [url]www.asp.net[/url]
AspAlliance Columnist, [url]www.aspalliance.com[/url]


"Johno" <ltj__bukem@hotmail.com> wrote in message
news:001f01c34d47$6ab94790$a401280a@phx.gbl...

> Whenever you drop a linkbutton on an ASP.NET web form,
> the following script gets emitted:
>
> function __doPostBack(eventTarget, eventArgument) {
> var theform = document.Form1;
> theform.__EVENTTARGET.value = eventTarget;
> theform.__EVENTARGUMENT.value =
> eventArgument;
> theform.submit();
> }
>
> However, when I check the call to __doPostBack() executed
> when the linkbutton is checked, only the eventTarget
> argument is specified, even though the linkbutton has
> it's CommandArgument property set.
>
> What's the purpose of the .__EVENTARGUMENT field in
> relation to server-side postback controls?
>
> TIA
>
> John

[Johno]

Thanks for the response guys

John