[Seaside] jQuery html rendering

Julian Fitzell jfitzell at gmail.com
Sun Jul 12 21:09:03 UTC 2009

It may work sometimes, but certain things will not work. #updateRoot:
for example, will not be called for that component or any component
contained within it. In 2.8, I think callbacks won't work for those

Even lazy initialization is not really good enough - it may work
sometimes but updateRoot: and others certainly won't be called during
the first request. Also, you shouldn't modify backtracked component
state during rendering, so you may need to be careful there when using
lazy initialization too (off the top of my head, I can't remember if
that same restriction applies during javascript rendering callbacks,
though - it may not).

I'm not certain that these things are causing your problems, but it's
the most obvious thing that jumps out at me. If you aren't persisting
the components, you really don't need a component. In 2.9, make a
subclass of WAPainter instead - those don't need to be persisted. In
2.8, you could try just subclassing Object and implementing #renderOn:
but it may or may not give you everything you need.

If making that change fixes your problem (or you discover that you
*do* need components and therefor *do* need to be persisting them)
then we've found the issue. Otherwise, if you prepare a simple example
that we can file in and debug someone may be able to help further.


On Sun, Jul 12, 2009 at 7:18 PM, Robert Sirois<watchlala at hotmail.com> wrote:
> Thanks, Julian. I am a bit confused, though.
>     html anchor
>         onClick: ((html jQuery: '#contentArea') html: [:r | r render:
> (RPSSCreator new)]);
>         with: 'Create a new survey'.
> I have been using code like this in a few areas, and it works just fine. The
> object just needs to persist until it does its job, then I can move along in
> whatever process.
> I can't seem to get some of my components to render in this way... I get:
> 'MessageNotUnderstood: RPSSSurveyItemComponent>>nil'. As far as I can tell,
> there is nothing different about it (than the others), and I am not sending
> any messages to it except #new. WACounter, etc. work fine in its place.
> As far as #children goes, I havn't been including everything there because
> the page is remaining relatively static. 'RPSSSurveyItemComponent' is a
> WAComponent subclass, but I'm just using it to generate survey components,
> so for each new survey item I will need a new instance.
> Is lazy initializing good enough for creating these objects in advance when
> it comes to jQuery?
> Thanks,
> RS
>> Date: Sun, 12 Jul 2009 08:22:03 +0100
>> Subject: Re: [Seaside] jQuery html rendering
>> From: jfitzell at gmail.com
>> To: seaside at lists.squeakfoundation.org
>> Components are persistent objects. You can't create them on the fly as
>> throw-aways (in particular they need to be returned from your
>> #children method). See the recent discussion about components,
>> painters, and renderable objects on this list.
>> You either need to create the component earlier and store it somewhere
>> or not use a component here (if you don't need the object to persist,
>> you don't need a component).
>> Julian
>> On Sun, Jul 12, 2009 at 12:25 AM, Robert Sirois<watchlala at hotmail.com>
>> wrote:
>> > clickFunctionNew: html
>> >         ^((html jQuery: '#newArea') html: [:r | r render:
>> > ((RPSSSurveyItemComponent new) newInputOn: self inputType; yourself)]).
>> >
>> > Could someone please explain to me why this does not work? If I replace
>> > the
>> > class 'RPSSSurveyItemComponent' with some like a string 'blah', it runs
>> > fine. Am I to understand that I cannot render components (the
>> > aforementioned
>> > class is a WAComponent subclass with the proper 'renderContentOn:'
>> > method)
>> > like a can do with standard Seaside callbacks?
>> >
>> > Thanks!
>> >
>> > RS
>> >
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