TJ, thanks for your help on the Form.EventObserver. The non-timed version
is simply not being activated until the submit button is clicked so I had to
use the timed version. I hate doing that because of the cpu overhead but we
gotta do what works.
My next question on event observers is unloading them. This creates the
form observer:
new Form.Observer('myform', 0.5, updateMessage);
BUT this does not remove it: Event.stopObserving('myform', 0.5,
updateMessage);
If you're using ajax for forms, you create an event observer, update the
form (result of a save, initial load etc.) then the event observer gets
triggered because the form data is changed (which all makes sense) BUT the
fact that you can't force a reserialize so that new changes can be detected
is kinda lame and leaves one with the only apparent option of removing the
event observer, making changes and then reinstalling a new observer.
So, what's the trick to uninstalling the form.eventobserver?
Thanks!
Pete
On Mon, Aug 23, 2010 at 2:51 AM, T.J. Crowder <t...@crowdersoftware.com>wrote:
> Hi,
>
> ...although despite the API docs saying *nothing* about it,
> Form.EventObserver looks like it might do what you want on an event
> (rather than timed) basis. Note that that may not necessarily do what
> you want because it uses the `change` event on `select` and `text`
> boxes, which is only fired by some browsers when the select/text box
> loses focus (not on keypress). The timed check done by Form.Observer
> happens more proactively (but -- especially on IE -- can be a drain on
> the CPU).
>
> But I would expect this (your quoted code with a </script> tag removed
> from the middle of it) to *basically* work:
>
> new Form.EventObserver($("myform"), updateFormMessage);
> function updateFormMessage() {
> $('myform_msg').innerHTML = "Click the Save button to save your new
> settings.";
> alert("Form Changed!");
> }
>
> ...and in fact:
> http://jsbin.com/aboxu4
>
> HTH,
> --
> T.J. Crowder
> Independent Software Consultant
> tj / crowder software / com
> www.crowdersoftware.com
>
>
> On Aug 23, 7:37 am, "T.J. Crowder" <t...@crowdersoftware.com> wrote:
> > Hi,
> >
> > You want Form.Observer, not Form.EventObserver, and you need to
> > provide an interval telling it how often to check the form for
> > changes. It happens that your use case *is* the example used on
> > Form.Observer:http://api.prototypejs.org/dom/form/observer/
> >
> > HTH,
> > --
> > T.J. Crowder
> > Independent Software Consultant
> > tj / crowder software / comwww.crowdersoftware.com
> >
> > On Aug 23, 12:36 am, Phil Petree <phil.pet...@gmail.com> wrote:
> >
> >
> >
> > > Hey All!
> >
> > > I'm trying to implement a Form.EventObserver that will change a message
> > > within the form. By default the message says: "These are your current
> > > settings." and when a key is pressed I want the message to get changed
> to
> > > say "Click the Save button to save your new settings."
> >
> > > I have the function that sets the form message and its working just
> fine
> > > (gets called from other routines like during an ajax onComplete).
> >
> > > My problem is that I can not get the Form.EventObserver to call my
> routine.
> >
> > > I have tried putting this in the form header, in a .js file that gets
> > > included specifically for this form and inline just below the form
> (which is
> > > what most examples show) and nadda... zip... zilch... nothing! No
> errors
> > > and it absolutely doesn't get called!
> >
> > > // this code was used in the header and inline, strip off the <script>
> tags
> > > and the
> > > // raw javascript code was tried in the included form_name.js file
> > > <script type="text/javascript">
> > > new Form.EventObserver($("myform"), updateFormMessage);
> > > </script>
> > > function updateFormMessage() {
> > > $('myform_msg').innerHTML = "Click the Save button to save your new
> > > settings.";
> > > alert("Form Changed!");
> >
> > > }
> >
> > > Any suggestions would be appreciated!
> >
> > > Thanks,
> >
> > > Pete
>
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