Rails spinoffs - Aug 2007 - How do you use $$() and bindAsEventListener together?

Subject pretty much says it all:

I have $$(''a.citation''), and I am using invoke to run through
all of
them. I know I need to add bindAsEventListener in there somewhere, but  
what is the reference to my "looped" object that I pass back to it? I
have tried this and nothing, and neither give me any reference back  
inside my function.

	 
$$(''a.citation'').invoke(''observe'',''click'',cit_this.bindAsEventListener()
);

Thanks in advance,

Walter


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On 8/24/07, Walter Lee Davis
<waltd-HQgmohHLjDZWk0Htik3J/w@public.gmane.org>
wrote:
> I have $$(''a.citation''), and I am using invoke to run
through all of
> them. I know I need to add bindAsEventListener in there somewhere, but
> what is the reference to my "looped" object that I pass back to
it?
>
>
$$(''a.citation'').invoke(''observe'',''click'',cit_this.bindAsEventListener()
> );
If you''re trying to assign an event handler to all the citation links,
you can do it like so:

$$(''a.citation'').invoke(''observe'',
''click'', eventHandler);

You don''t need to call bindAsEventListener. How you get the element
that triggered the event once inside the event handler depends on
whether you''re using 1.5 or 1.6.

1.5 style:
function eventHandler(evt) {
  var el = Event.element(evt);
  // do stuff with el
}

1.6 style:
function eventHandler(evt) {
  var el = this;  // sweet! ''this'' is mapped to the element
that fired
the event automatically
  // do stuff with el
}

I may have missed the point of what you''re actually trying to do, and
if so, I apologize.

:Dan Dorman

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And now I''ve come full-circle. I was using that 1.5 code previously,  
and the whole bindAsEventListener thing was to solve another problem I  
was having with IE6-- the reference from the click is to the image, not  
the link that wraps it, even though my loop is constructed of extended  
A objects.

How production-worthy is the RC of 1.6?

Thanks very much.

Walter

On Aug 24, 2007, at 2:16 PM, Dan Dorman wrote:
>
> On 8/24/07, Walter Lee Davis
<waltd-HQgmohHLjDZWk0Htik3J/w@public.gmane.org> wrote:
>> I have $$(''a.citation''), and I am using invoke to run
through all of
>> them. I know I need to add bindAsEventListener in there somewhere, but
>> what is the reference to my "looped" object that I pass back
to it?
>>
>>
$$(''a.citation'').invoke(''observe'',''click'',cit_this.bindAsEventListener
>> ()
>> );
>
> If you''re trying to assign an event handler to all the citation
links,
> you can do it like so:
>
> $$(''a.citation'').invoke(''observe'',
''click'', eventHandler);
>
> You don''t need to call bindAsEventListener. How you get the
element
> that triggered the event once inside the event handler depends on
> whether you''re using 1.5 or 1.6.
>
> 1.5 style:
> function eventHandler(evt) {
>   var el = Event.element(evt);
>   // do stuff with el
> }
>
> 1.6 style:
> function eventHandler(evt) {
>   var el = this;  // sweet! ''this'' is mapped to the
element that fired
> the event automatically
>   // do stuff with el
> }
>
> I may have missed the point of what you''re actually trying to do,
and
> if so, I apologize.
>
> :Dan Dorman
>
> >

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On 8/24/07, Walter Lee Davis
<waltd-HQgmohHLjDZWk0Htik3J/w@public.gmane.org>
wrote:
> How production-worthy is the RC of 1.6?
I just rewrote a big chunk of JS here at work to utilize 1.6''s
features, and it''s been pretty solid so far.

:Dan Dorman

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Yeah isn''t that a great bug in IE, there is no way for a click event
to reference its currentTarget, just where it originates from,
fantastic.

I worked out a solution to that using bindAsEventListener and just
attaching the object i was observing to the argument scope of the
bound function.

check out the full article here,

http://www.positionabsolute.net/blog/2007/04/function-bind.php

On Aug 24, 2:56 pm, "Dan Dorman"
<dan.dor...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> On 8/24/07, Walter Lee Davis
<wa...-HQgmohHLjDZWk0Htik3J/w@public.gmane.org> wrote:
>
> > How production-worthy is the RC of 1.6?
>
> I just rewrote a big chunk of JS here at work to utilize 1.6''s
> features, and it''s been pretty solid so far.
>
> :Dan Dorman

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Thanks, I had seen a similar example, and it works fine for single 
instances.

But when you are inside a loop, going through an array of many elements 
on the page with each or invoke, there doesn''t seem to be any reference
possible to the object in question. I ended up using Event.element 
inside my anonymous function, but I live in fear that IE will think 
that''s too ambiguous.

Is there some way to use bind or bindAsEventListener when you are 
looping through a collection with invoke?

Walter

On Aug 24, 2007, at 3:50 PM, Matt Foster wrote:
>
> Yeah isn''t that a great bug in IE, there is no way for a click
event
> to reference its currentTarget, just where it originates from,
> fantastic.
>
> I worked out a solution to that using bindAsEventListener and just
> attaching the object i was observing to the argument scope of the
> bound function.
>
> check out the full article here,
>
> http://www.positionabsolute.net/blog/2007/04/function-bind.php
>
> On Aug 24, 2:56 pm, "Dan Dorman"
<dan.dor...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>> On 8/24/07, Walter Lee Davis
<wa...-HQgmohHLjDZWk0Htik3J/w@public.gmane.org> wrote:
>>
>>> How production-worthy is the RC of 1.6?
>>
>> I just rewrote a big chunk of JS here at work to utilize 1.6''s
>> features, and it''s been pretty solid so far.
>>
>> :Dan Dorman
>
>
> >

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I dont think its possible with invoke, but using each should work

$$(''a.citation'').each(function(el)
{el.observe(''click'',cit_this.bindAsEventListener(el));}
);


Tom

On Aug 24, 1:13 pm, Walter Lee Davis
<wa...-HQgmohHLjDZWk0Htik3J/w@public.gmane.org>
wrote:
> Thanks, I had seen a similar example, and it works fine for single
> instances.
>
> But when you are inside a loop, going through an array of many elements
> on the page with each or invoke, there doesn''t seem to be any
reference
> possible to the object in question. I ended up using Event.element
> inside my anonymous function, but I live in fear that IE will think
> that''s too ambiguous.
>
> Is there some way to use bind or bindAsEventListener when you are
> looping through a collection with invoke?
>
> Walter
>
> On Aug 24, 2007, at 3:50 PM, Matt Foster wrote:
>
>
>
> > Yeah isn''t that a great bug in IE, there is no way for a
click event
> > to reference its currentTarget, just where it originates from,
> > fantastic.
>
> > I worked out a solution to that using bindAsEventListener and just
> > attaching the object i was observing to the argument scope of the
> > bound function.
>
> > check out the full article here,
>
> >http://www.positionabsolute.net/blog/2007/04/function-bind.php
>
> > On Aug 24, 2:56 pm, "Dan Dorman"
<dan.dor...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> >> On 8/24/07, Walter Lee Davis
<wa...-HQgmohHLjDZWk0Htik3J/w@public.gmane.org> wrote:
>
> >>> How production-worthy is the RC of 1.6?
>
> >> I just rewrote a big chunk of JS here at work to utilize
1.6''s
> >> features, and it''s been pretty solid so far.
>
> >> :Dan Dorman

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$$(''a.citation'').invoke(''observe'',
''click'', callback);

function callback(e){
  e.stop(); // here''s your event
  alert(this); // here''s your element
  alert(this.up()); // that''s how you can access upper element
  alert(e.target); // this should reference element that fired event
}

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Tom a écrit :
> I dont think its possible with invoke, but using each should work
In 1.6 it is, because you''d get properly bound ("this" is the
element
you registered on).  In 1.5, you would need the each, but you don''t
need
bindAsEventListener: not passing any extra arguments means you''ll get 
the event object as first arg even with a simple bind.

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

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Thanks, this is approximately what I ended up doing, except using 
Event.findElement rather than up.

Walter

On Aug 25, 2007, at 12:37 AM, kangax wrote:
>
>
> $$(''a.citation'').invoke(''observe'',
''click'', callback);
>
> function callback(e){
>   e.stop(); // here''s your event
>   alert(this); // here''s your element
>   alert(this.up()); // that''s how you can access upper element
>   alert(e.target); // this should reference element that fired event
> }
>

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Thanks so much, this was what I was looking for.

Walter

On Aug 24, 2007, at 9:41 PM, Tom wrote:
>
> I dont think its possible with invoke, but using each should work
>
> $$(''a.citation'').each(function(el)
> {el.observe(''click'',cit_this.bindAsEventListener(el));}
> );
>
>
> Tom
>

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