[Seaside] Can I know if a WATask answered?

jtuchel at objektfabrik.de jtuchel at objektfabrik.de
Mon Nov 3 10:32:17 UTC 2014

Hi Mariano,

I am not sure if I understand your question/problem completely. So I'll 
just write down some occasional thoughts on things that may or may not 
be of use to you ;-)

Am 31.10.14 um 16:52 schrieb Mariano Martinez Peck:
> Hi guys,
> There is an scenario that I don't know how to deal. I have a main 
> component that displays tabs. Each tabs render a component. This 
> component could be anything, including a task. The tab has correctly 
> defined the #children. And the way the tab displays its current 
> contents (a component) is via:  "self activeTabComponent renderOn: html"
I am using VA Smalltalk, and there are no Continuations there, so I 
either use show:onAnswer: or the direct rendering of child components 
like you do.

> The problem is if "activeTabComponent" is a Task. Since I am not doing 
> not replacing anything (calling), I do not use #call: but #renderOn: 
> as displayed above. The task can, at any point in time, or when the 
> user clicks "Finish" do a "self answer: nil". I don't know what 
> happens with this "self answer:" because I didn't do a #call: to that 
> task.
Hmm. There are several things to note here. First, you can always use 
onAnswer: to execute a Block whenever a component answers. So there is 
no need call: a component in order to get an answer. The only difference 
is that this is a Block that gets executed as sson as the component 
answers:, but it doesn't halt the normal execution of a calling method 
as in call:/answer:.

So you can always do something like;

self activeTabComponent: (MyTaskOrComponent new onAnswer: [:answer| self 
handleAnswer: answer]).

Another cool place to use this if you have a JQDialog and need its 
answer when it's closed.

> Anyway... I would like to hook from my main component and I would like 
> to know if the task has answered or even if the #go method finished so 
> that I can automatically close the tab and remove this task.  Of 
> course, I can pass the main component to the task, and then from the 
> task itself tell the main component that he has finished...but I don't 
> like this very much.
Although I fully agree: Sometimes it is the only thing that works. Apart 
from some publish/subscribe mechanism like Announcements. But 
Announcements are dangerous if you don't clean up subscriptions once 
your component is gone. I once hunted for strange duplicate INSERTs to 
the Database, just to find out that some old Components still handled 
announcements although they had long disappeared from the tree of 
visible components... I lost a couple of hours if not days with this ;-)

Does this help? If not, maybe you can give a few more details on your 

Happy day at the Seaside,


> Any idea?
> Thanks in advance
> -- 
> Mariano
> http://marianopeck.wordpress.com
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Objektfabrik Joachim Tuchel          mailto:jtuchel at objektfabrik.de
Fliederweg 1                         http://www.objektfabrik.de
D-71640 Ludwigsburg                  http://joachimtuchel.wordpress.com
Telefon: +49 7141 56 10 86 0         Fax: +49 7141 56 10 86 1

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