Rails spinoffs - Jan 2006 - Effect together with ...firstChild - can''t get it to work

Hi,
I am relatively new to Rails and I can''t get the following to work:
what I am trying to do is to make the first item of a list to flash:

var item = $(''items'').firstChild;
new Effect.Highlight(item);

I get the this Javascript error message:
this._base has no child (effects.js, line 445)

But I am able to do this without any problems:
var item = $(''items'');
new Effect.Highlight(item);
(now the whole list flashes)

My list looks like that:
<ul id="items">
<li>test1</li>
<li>test2</li>
<li>test3</li>
</ul>

Thank you very much in advance,
Matthias

On 1/12/06, Matthias Buchetics
<mbuchetics-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> Hi,
> I am relatively new to Rails and I can''t get the following to
work:
> what I am trying to do is to make the first item of a list to flash:
>
> var item = $(''items'').firstChild;
> new Effect.Highlight(item);
>
> I get the this Javascript error message:
> this._base has no child (effects.js, line 445)
>
> But I am able to do this without any problems:
> var item = $(''items'');
> new Effect.Highlight(item);
> (now the whole list flashes)
>
> My list looks like that:
> <ul id="items">
> <li>test1</li>
> <li>test2</li>
> <li>test3</li>
> </ul>
>
> Thank you very much in advance,
> Matthias
Hi Matthias

If you''re using a Mozilla-based browser, the firstChild call is
probably returning an empty text node.  Moz inserts these all over the
place - you can check with the DOM inspector under the ''Tools''
menu.

Try using a different method to get at the children; enumerating and
checking what type they are might be a way to do it, but it depends on
your ultimate goal.

Hope that helps!
Dave


--
Dave Goodlad
dgoodlad-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org or
dave-eHfbeeWWzZOw5LPnMra/2Q@public.gmane.org
http://david.goodlad.ca/

Thank you very much for the hint. The following code worked:
new
Effect.Highlight($(''items'').getElementsByTagName(''li'')[0]);

Thanks again,
Mat

On 1/13/06, David Goodlad
<dgoodlad-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> On 1/12/06, Matthias Buchetics
<mbuchetics-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> > Hi,
> > I am relatively new to Rails and I can''t get the following to
work:
> > what I am trying to do is to make the first item of a list to flash:
> >
> > var item = $(''items'').firstChild;
> > new Effect.Highlight(item);
> >
> > I get the this Javascript error message:
> > this._base has no child (effects.js, line 445)
> >
> > But I am able to do this without any problems:
> > var item = $(''items'');
> > new Effect.Highlight(item);
> > (now the whole list flashes)
> >
> > My list looks like that:
> > <ul id="items">
> > <li>test1</li>
> > <li>test2</li>
> > <li>test3</li>
> > </ul>
> >
> > Thank you very much in advance,
> > Matthias
>
> Hi Matthias
>
> If you''re using a Mozilla-based browser, the firstChild call is
> probably returning an empty text node.  Moz inserts these all over the
> place - you can check with the DOM inspector under the
''Tools'' menu.
>
> Try using a different method to get at the children; enumerating and
> checking what type they are might be a way to do it, but it depends on
> your ultimate goal.
>
> Hope that helps!
> Dave
>
>
> --
> Dave Goodlad
> dgoodlad-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org or
dave-eHfbeeWWzZOw5LPnMra/2Q@public.gmane.org
> http://david.goodlad.ca/
> _______________________________________________
> Rails-spinoffs mailing list
> Rails-spinoffs-1W37MKcQCpIf0INCOvqR/iCwEArCW2h5@public.gmane.org
> http://lists.rubyonrails.org/mailman/listinfo/rails-spinoffs
>

Maybe this would work too:

Element.cleanWhitespace(''items'');
var item = $(''items'').firstChild;

-----Original Message-----
From: rails-spinoffs-bounces-1W37MKcQCpIf0INCOvqR/iCwEArCW2h5@public.gmane.org
[mailto:rails-spinoffs-bounces-1W37MKcQCpIf0INCOvqR/iCwEArCW2h5@public.gmane.org]
On Behalf Of Matthias
Buchetics
Sent: Friday, January 13, 2006 10:23 AM
To: rails-spinoffs-1W37MKcQCpIf0INCOvqR/iCwEArCW2h5@public.gmane.org
Subject: Re: [Rails-spinoffs] Effect together with ...firstChild -
can''t
getit to work

Thank you very much for the hint. The following code worked:
new
Effect.Highlight($(''items'').getElementsByTagName(''li'')[0]);

Thanks again,
Mat

On 1/13/06, David Goodlad
<dgoodlad-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> On 1/12/06, Matthias Buchetics
<mbuchetics-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> > Hi,
> > I am relatively new to Rails and I can''t get the following to
work:
> > what I am trying to do is to make the first item of a list to flash:
> >
> > var item = $(''items'').firstChild;
> > new Effect.Highlight(item);
> >
> > I get the this Javascript error message:
> > this._base has no child (effects.js, line 445)
> >
> > But I am able to do this without any problems:
> > var item = $(''items'');
> > new Effect.Highlight(item);
> > (now the whole list flashes)
> >
> > My list looks like that:
> > <ul id="items">
> > <li>test1</li>
> > <li>test2</li>
> > <li>test3</li>
> > </ul>
> >
> > Thank you very much in advance,
> > Matthias
>
> Hi Matthias
>
> If you''re using a Mozilla-based browser, the firstChild call is
> probably returning an empty text node.  Moz inserts these all over the
> place - you can check with the DOM inspector under the
''Tools'' menu.
>
> Try using a different method to get at the children; enumerating and
> checking what type they are might be a way to do it, but it depends on
> your ultimate goal.
>
> Hope that helps!
> Dave
>
>
> --
> Dave Goodlad
> dgoodlad-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org or
dave-eHfbeeWWzZOw5LPnMra/2Q@public.gmane.org
> http://david.goodlad.ca/
> _______________________________________________
> Rails-spinoffs mailing list
> Rails-spinoffs-1W37MKcQCpIf0INCOvqR/iCwEArCW2h5@public.gmane.org
> http://lists.rubyonrails.org/mailman/listinfo/rails-spinoffs
>
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This is from the macrumors site that posted the macworld update:

"In short, we peaked at approximately 103,000 simultaneous web  
visitors and over 6,000 IRC viewers during the keynote speech and  
consumed over 32 GB of bandwidth during the three hours surrounding  
the event. (For those interested, a non-AJAX version of MacRumorsLive  
would have required an estimated 196 GB of bandwidth over the same  
period of time)."

We, of course, are seeing bandwidth reduction, but it is great to see  
some published numbers!

Deco



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Excuse me while my jaw drops...
Thats amazing, I never realized Ajax could make such a difference!
and I love scriptaculous for making it so very easy!
Keep up the great work everybody.

On 1/13/06, Deco Rior <decorior-w9xKMqPX1QdNhnlO7+U8Og@public.gmane.org>
wrote:
>
> This is from the macrumors site that posted the macworld update:
>
> "In short, we peaked at approximately *103,000* simultaneous web
visitors
> and over *6,000* IRC viewers during the keynote speech and consumed over
> 32 GB of bandwidth during the three hours surrounding the event. (For those
> interested, a
non-AJAX<http://www.macrumors.com/c.php?u=http%3A%2F%2Fen.wikipedia.org%2Fwiki%2FAJAX>version
of MacRumorsLive would have required an estimated 196 GB of
> bandwidth over the same period of time)."
> We, of course, are seeing bandwidth reduction, but it is great to see some
> published numbers!
>
> Deco
>
>
> _______________________________________________
> Rails-spinoffs mailing list
> Rails-spinoffs-1W37MKcQCpIf0INCOvqR/iCwEArCW2h5@public.gmane.org
> http://lists.rubyonrails.org/mailman/listinfo/rails-spinoffs
>
>
>

--
===========================Brian Peiris
Brampton, Ontario, Canada
brianpeiris-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org or
brianpeiris-PkbjNfxxIARBDgjK7y7TUQ@public.gmane.org
===========================

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