[Seaside] Cancel Button and

[Avi Bryant]

On Fri, 11 Feb 2005 15:09:23 -0500, Reg Krock <rkrock3 at cogeco.ca> wrote:

> The Cancel button is also coded with a callback.
> 
>         html submitButtonWithAction: [
>                 self answerZeroTickets] text: 'Cancel'
> 
> The way my code works is if an invalid value had been entered, the
> user gets an error message before the cancel button takes effect.
> 
> The reason is that the input field callback is handled before the
> cancel callback is handled.
> 
> I have ? questions:
> 1) Is this normal web behaviour?

More or less, yes.  It's certainly normal Seaside behavior.  However:

> 2) If it is not normal web behaviour, is there any way for the field
> callback to know that the cancel has also been pressed.

The easiest way to handle this is by using #cancelButtonWithAction:, as below:

html cancelButtonWithAction: [self answerZeroTickets]

If the user clicks on a cancel button that's been defined that way,
Seaside will suppress all the other callbacks that would normally have
been evaluated on that form.

Cheers,
Avi