[support] Writing ahah callbacks to a

[Pierre Rineau]

Le mardi 02 novembre 2010 à 15:59 -0400, Christopher M. Jones a écrit :
> On 11/02/2010 02:52 PM, Pierre Rineau wrote:
> > On Tue, 2010-11-02 at 14:33 -0400, Christopher M. Jones wrote:
> >> I have a custom cck widget. I want part of that widget to open in a
> >> modal window (modalframe api), which uses an iframe. I have a function
> >> that encapsulates the portion of the form array in question. There are
> >> ahah elements througout the form, including in the portion that opens in
> >> the modal frame.
> >>
> >> I want the use of the frame to be optional. So, in case the user has
> >> elected to use the frame, I want to render a button in the widget that
> >> activates the frame, rendering the rest of the form. But I need ahah
> >> actions in the frame to effect changes in the parent. So, when the ahah
> >> callback returns a new element, I need that element to be passed back to
> >> the parent.
> >>
> >> I'm stuck here. I'm new to CCK widgets and new to ahah. I've read so
> >> much that my head is spinning. I'd love it if someone could outline for
> >> me the best method for accomplishing this.
> >>
> >> Here's some brain vomit, for anyone who cares to read further:
> >>
> >> Should the ahah responses be stored somewhere within the child document,
> >> to be dumped into the parent when the window is closed?
> >>
> >> I'd rather have changes to the parent be incremental, so that the parent
> >> page is already updated by the time the user thinks to close the window.
> >> But I'll settle for anything, at this point.
> >>
> >> Or, since the form cache is being updated by the ahah callback, then
> >> couldn't one re-render the whole form when the window is closed?
> >>
> >> Is there a way to rebind ahah in the child window to ahah in the parent?
> >> Pass contexts around?
> >>
> >> ... and so forth ...
> >
> > I did some tricky stuff, a long time ago. I did put AHAH stuff on a
> > whole form (or the most top level element I could put it), but instead
> > of puting it on a known event (such as 'click' or 'change'), I put it on
> > a custom event, which does not exists, such as 'my_magnificient_event'.
> >
> > The good thing about this, is then, when your user closes the window,
> > you can trigger manually the "non existing event" using jQuery, such as
> > $("#myform .the_element_where_I_did_put_the_ahah_event").trigger("my_magnificient_event"); and hop, you win!
> >
> > For the incremental stuff, it may be more difficult. Think about one
> > thing, which is quite annoying, when you open a modal, most APIs will
> > append the real DOM element representing the dialog at the body's
> > bottom, so it won't be within the form, so submitting the form won't
> > submit the values that are in the dialog. If you experience such
> > problem, you may have to implement your own modal by writing some JS (it
> > looks like much more complicated that it is really). Then, you can do
> > whatever you want even embed you form parts within the dialog without
> > worrying about this.
> >
> > Pierre.
> >
> Pierre, thanks. I like the custom event. I didn't know I could do that. 
> I think the incremental stuff is a chimera, anyway. As content.module 
> explains (in the comments on the add more-related functions) tabledrag 
> won't let us simply add a row to the widget. So content.module rewrites 
> and reattaches the whole widget every time an element is added. Might as 
> well do that once, rather than over and over. So, I guess what I can do 
> is use the close event handler provided by modalframe to post to a 
> callback and write the response to the parent window, which I  know how 
> to access from there. The ahah events in the modal-contained form will 
> already have updated the form cache. So all I need to do at close time 
> is pull the cache and rebuild the form.

Good, it seems that you have your answers then. Don't forget, if you
manually have to do AHAH in your forms, take a look at the ahah_helper
module, which works great, and will help you avoid writing hundreds of
code lines only for Form API in AHAH handling.

Pierre.