Rails spinoffs - Jun 2007 - Ajax.Responders, grabbing the element name?

Is there any possible way (I''m using prototype framework) to glean
what the name of the container element to be updated (using
Ajax.Updater) is?

I have appended at the bottom of prototype.js a function that shows a
loading dialog when any AJAX interaction takes place (I use this all
the time, it''s AMAZING, feel free to use it, and if you want the rest
just reply and I''ll paste all the code), but I need to cancel it for
one particular element and cannot figure out a way without knowing the
element name.

Here''s the code:

Ajax.Responders.register({
  onCreate:function() {
    if($(''busy'') && Ajax.activeRequestCount > 0) {
      // show the loading dialog
    }
  }
});

..... (more code)

I would love to do something like alert(Ajax.Updater.container); but
that does not work, does anyone know how to do this?


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I would be interested in the full function.

Terry Riegel


On Jun 13, 2007, at 2:32 PM, conspireagainst wrote:
>
> Is there any possible way (I''m using prototype framework) to glean
> what the name of the container element to be updated (using
> Ajax.Updater) is?
>
> I have appended at the bottom of prototype.js a function that shows a
> loading dialog when any AJAX interaction takes place (I use this all
> the time, it''s AMAZING, feel free to use it, and if you want the
rest
> just reply and I''ll paste all the code), but I need to cancel it
for
> one particular element and cannot figure out a way without knowing the
> element name.
>
> Here''s the code:
>
> Ajax.Responders.register({
>   onCreate:function() {
>     if($(''busy'') && Ajax.activeRequestCount >
0) {
>       // show the loading dialog
>     }
>   }
> });
>
> ..... (more code)
>
> I would love to do something like alert(Ajax.Updater.container); but
> that does not work, does anyone know how to do this?
>
>
> >
>

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Ajax.Responders.register({
	onCreate:function() {
		if($(''busy'') && Ajax.activeRequestCount > 0) { //
does the busy
element exist, and have we requested ajax?
				$(''busy'').style.paddingTop =
getPageScroll()[1]+80+''px''; // set
the indicator to somewhere roughtly centered top-down
				$(''busy'').style.display = ''block''; //
and show the element
		}
	},
	onComplete:function() { // when we''re finished being busy, shut it
off
		if($(''busy'')) { // does the busy element exist?
			$(''busy'').style.display = ''none''; // turn
the element off
		}
	}
});

Note: this code requires you to have a container element on every page
with the id "busy", I chose to use an animated gif 80 x 80 pixels that
is a spinning loading circle.

Very *important* caveat: You have to be very careful with this,
because this can cause problems with some elements, like javascript
tooltip rollovers that load their content via ajax, as the system will
constantly switch on and off the activeRequestCount between 1, 2, and
0. I had another if statement inside the first one to cancel this
action. I can paste more code if necessary.

On Jun 13, 2:36 pm, Terry Riegel
<trie...-9geWAZNePKniiUjhnDU40B2eb7JE58TQ@public.gmane.org>
wrote:
> I would be interested in the full function.
>
> Terry Riegel
>
> On Jun 13, 2007, at 2:32 PM, conspireagainst wrote:
>
>
>
> > Is there any possible way (I''m using prototype framework) to
glean
> > what the name of the container element to be updated (using
> > Ajax.Updater) is?
>
> > I have appended at the bottom of prototype.js a function that shows a
> > loading dialog when any AJAX interaction takes place (I use this all
> > the time, it''s AMAZING, feel free to use it, and if you want
the rest
> > just reply and I''ll paste all the code), but I need to cancel
it for
> > one particular element and cannot figure out a way without knowing the
> > element name.
>
> > Here''s the code:
>
> > Ajax.Responders.register({
> >   onCreate:function() {
> >     if($(''busy'') && Ajax.activeRequestCount
> 0) {
> >       // show the loading dialog
> >     }
> >   }
> > });
>
> > ..... (more code)
>
> > I would love to do something like alert(Ajax.Updater.container); but
> > that does not work, does anyone know how to do this?

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Hey,

conspireagainst a écrit :
> Is there any possible way (I''m using prototype framework) to glean
> what the name of the container element to be updated (using
> Ajax.Updater) is?
Of course there is.
> I have appended at the bottom of prototype.js a function that shows a
OK, don''t do that, please.  You''re asking for trouble:
whenever we
release a new prototype.js file, you''ll have to patch it.  Create your 
own .js file and load it after prototype.js, instead.  Don''t hack the 
lib, that''s not in your mid- or long-term interest.

As the docs state [1], Ajax.Responders callbacks are invoked with the 
request object (either Ajax.Request or Ajax.Updater) as the first argument.

In the case of Ajax.Updater, the container it''s going to update is 
referenced with the updater''s container.success property.

So you could do something like this (and btw, be clear: you''re not 
looking for names, but for id''s):

Ajax.Responders.register({
   _skippedIds: /^(?:id1|id2|id3...)$/,
   onCreate: function(req) {
     var container = req.container;
     if (!container || !this._skippedIds.test(container.success.id))
       return;
     // Your code here.
   }
});

''HTH

-- 
Christophe Porteneuve aka TDD
tdd-x+CfDp/qHev2eFz/2MeuCQ@public.gmane.org

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