autopostback - javascript intercept and cancel

[Susan van Houen]

Hi All,

How do I intercept an autopostback on the client side
and prevent it from executing the submit?

In classic ASP I used to intercept the on_submit and
just

return false;

but it doesn't seem to work anymore.

Any ideas?

Sincerely,
S

[Sreejumon[MVP]]

Hi Susan,

Please add the javascript function to your server control
as given below.
Button1.Attributes.Add("onclick", "return FunctionName
();");

Now put the function in html section. If success then you
can return true else false.

So it wont submit the page if client side function fails.

Let me know if you ned furtehr help.
Regards
Sreejumon

>-----Original Message-----
>Hi All,
>
>How do I intercept an autopostback on the client side
>and prevent it from executing the submit?
>
>In classic ASP I used to intercept the on_submit and
>just
>
> return false;
>
>but it doesn't seem to work anymore.
>
>Any ideas?
>
>Sincerely,
>S
>
>
>.
>

[Marina]

The reason that doesn't work, is because by setting AutoPostBack to true,
that generates an onselectedindexchanged handler, which just submits the
form. So the one you created, just get ignored.

I would instead suggested that you turn autopostback to false, and just keep
your handler. This handler should then sometimes manually submit the form by
calling its submit method.

"Susan van Houen" <svhouen@hotmail.com> wrote in message
news:uEdR89JTDHA.2196@TK2MSFTNGP12.phx.gbl...

> Thank you for your response, but I can't get it to work.
>
> My control looks like this
> <asp:dropdownlist id="ddlPoi" style="Z-INDEX: 125; LEFT: 32px; POSITION:
> absolute; TOP: 445px" runat="server"
> OnSelectedIndexChanged="lbLocoptions_SelectedIndex Changed"
> AutoPostBack="True">
>
> When OnSelectedIndexChanged is fired I want it to pass through a client

side

> javascript where I can evaluate if I actually want the autopostback to
> complete or not.
>
> In the Page_Load of the behind code I have
>
> lbLocoptions.Attributes.Add("onselectedindexchange d", "return
> lbLocoptions_onchange();")
>
> and in the client I have
>
> function lbLocoptions_onchange(){
> return false;
> }
>
> Still, the AutoPostBack completes every time.
>
> Sincerely,
> S
>
> "Sreejumon[MVP]" <sreeju_uss@hotmail.com> wrote in message
> news:016301c34c9b$1faf4d50$a601280a@phx.gbl...

> > Hi Susan,
> >
> > Please add the javascript function to your server control
> > as given below.
> > Button1.Attributes.Add("onclick", "return FunctionName
> > ();");
> >
> > Now put the function in html section. If success then you
> > can return true else false.
> >
> > So it wont submit the page if client side function fails.
> >
> > Let me know if you ned furtehr help.
> > Regards
> > Sreejumon
> >
> >

> > >-----Original Message-----
> > >Hi All,
> > >
> > >How do I intercept an autopostback on the client side
> > >and prevent it from executing the submit?
> > >
> > >In classic ASP I used to intercept the on_submit and
> > >just
> > >
> > > return false;
> > >
> > >but it doesn't seem to work anymore.
> > >
> > >Any ideas?
> > >
> > >Sincerely,
> > >S
> > >
> > >
> > >.
> > >

>
>