[TurboGears] Re: Observers

Wed, 18 Oct 2006 04:50:09 -0700

I think,

that having observers in widgets, would be a plus to turbogears, like in JSF (Java Server Faces).
How the thing works?
You create a widget  and associates some event that occurs in this widget with one method in the server, and the application write all _javascript_ necessary to you.
example:

nowadays:
apartmentType = widgets.TextField(
                                name		= "apartamentType",
                                label		= 
"Name: ",
                                attrs		= dict(maxlength = "64", size = "30"
),
                                validator	= validators.String(max = 64, not_empty = True),
                                help_text	= ""
                        )

with event handler, the widget could be
apartmentType = widgets.TextField(
                                name		= "apartamentType",
                                label		= 
"Name: ",
                                attrs		= dict(maxlength = "64", size = "30"
),
                                validator	= validators.String(max = 64, not_empty = True),
                                help_text	= "", 
                                
event_handler   = dict('onchange', 'selectedApJs', "turbogears.url('selectedAp')") 
                        )
where
event
selectedApJs = _javascript_ function to work with data returned by turbogears.url('selectedAp')
selectAp = method in the server, invoked by any change on this textfield.


I think is this.

mario h.c.t.



On 10/17/06, Jorge Godoy <[EMAIL PROTECTED]> wrote:


isaac <[EMAIL PROTECTED]> writes:

> I'm wondering... how would you do that *without* JS?

Probably Rails generates the _javascript_.

> Or do you mean "JS I don't have to write myself"?  ;)


Probably. :-)

BUT there's also a different paradigm as a push method instead of a polling
application.  Take a look at comet, for example.

> This could be done fairly easily as a widget, it's just that no one

> has done it in a handy re-usable form, AFAIK, yet.

It just takes a couple of lines.  It's so simple that isn't worth packaging
alone :-)

I believe that it makes more sense when you embed it with your application's

specific code to achieve something otherwise it is a bit overkill to use
widgets just for that and using them alone at the template.


--
Jorge Godoy      <[EMAIL PROTECTED]
>



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