Expandos are not proprietary to Microsoft. They are custom attributes. For
instance:
var oDiv = document.getElementById('myDiv');
oDiv.collapsible = "true"; // safe expando
var oSpan = document.getElementById('mySpan');
oDiv.relatedSpan = oSpan; // potentially dangerous expando
oDiv.relatedSpanId = oSpan.id; // safe expando
Please correct me if I'm understanding this the wrong way. Strings are safe.
Object references are not. I haven't had time to read the MSDN article from
the previous reply, but I'm pretty sure this is what they're talking about.
Brian.
On 3/1/07, Chris Ovenden <[EMAIL PROTECTED]> wrote:
I'm confused. Are these expandos proprietory Microsoft attributes with a
specific meaning, or can it also apply to a non-standard attribute that I
may invent for a particular purpose (eg all collapsible elements on a page
might have a custom attribute collapsible="true")? If it's the latter, I
don't see how such attributes can reference anything at all, at least as far
as the DOM model is concerned. They're just strings.
Personally I avoid this kind of extra attribute; class is a pretty good
catch-all for most needs of this kind. I know you can make them valid HTML
by extending the DTD, but that seems like a lot of extra work for not much
gain.
Chris
On 3/1/07, Karl Rudd <[EMAIL PROTECTED]> wrote:
>
> I believe so. As I said an "expando" attribute is basically any
> non-standard attribute that gets added to an element (doesn't matter
> how).
>
> As Klaus notes, the memory leakage is only a problem in IE when the
> attribute references other DOM elements (directly, or indirectly via
> closures).
>
> Karl Rudd
>
> On 3/1/07, Ⓙⓐⓚⓔ <[EMAIL PROTECTED]> wrote:
> > so any non standard attribute accessed simple as object.hello is an
> > expando? no matter if you call getAttribute or not??
> >
> >
> >
> > On 2/28/07, Karl Rudd <[EMAIL PROTECTED]> wrote:
> > > Err no, actually "expandos" refers to "non-standard" attributes that
>
> > > get added to DOM elements. They "expand" the attributes that are
> > > available on an element.
> > >
> > > For instance adding an "expando" attribute called "hello":
> > >
> > > <input type="submit" value="blah" hello="Hello world!">
> > >
> > > Because they're "non-standard" they can cause memory leak problems
> > > under Internet Explorer if they refer to other DOM elements.
> > >
> > > More info here:
> > >
> > >
>
http://msdn.microsoft.com/workshop/author/dhtml/reference/properties/expando.asp
> > >
> > > Karl Rudd
> > >
> > > On 3/1/07, Ⓙⓐⓚⓔ <[EMAIL PROTECTED] > wrote:
> > > > Fil, did you ever get a definition of "DOM 0 expandos"...
> > > >
> > > > they're the shortcuts that were provided with dom level 0, that
> are
> > > > short cuts for certain html(only) attributes, and collections of
> dom
> > > > nodes.
> > > >
> > > > like
> > > >
> > > > a.href is an 'expando' whereas a. a.getAttribute('href') is not.
> > > >
> > > > and
> > > >
> > > > document.forms is an expando whereas a.getElementsbyTagname('form')
> is not.
> > > >
> > > >
> > > > I'm pretty sure thats what it means!
> > > >
> > > > bonne chance!
> > > >
> > > > On 2/28/07, Fil <[EMAIL PROTECTED]> wrote:
> > > > > > * Changed: Events are now internally stored in elem.$events
> rather
> > > > > > than elem.events (due to a nasty bug relating to DOM 0
> expandos).
> > > > >
> > > > > I'm translating this blog into French, but I can't figure how to
> translate
> > > > > this sentence. "DOM 0 expandos" ?
> > > > >
> > > > > Anyway this is available at http://www.jquery.info/spip.php?article42
>
> > > > >
> > > > > -- Fil
> > > > >
> > > > >
> > > > > _______________________________________________
> > > > > jQuery mailing list
> > > > > discuss@jquery.com
> > > > > http://jquery.com/discuss/
> > > > >
> > > >
> > > >
> > > > --
> > > > Ⓙⓐⓚⓔ - יעקב ʝǡǩȩ ᎫᎪᏦᎬ
> > > > _______________________________________________
> > > > jQuery mailing list
> > > > discuss@jquery.com
> > > > http://jquery.com/discuss/
> > > >
> > > _______________________________________________
> > > jQuery mailing list
> > > discuss@jquery.com
> > > http://jquery.com/discuss/
> > >
> >
> >
> > --
> > Ⓙⓐⓚⓔ - יעקב ʝǡǩȩ ᎫᎪᏦᎬ
> > _______________________________________________
> > jQuery mailing list
> > discuss@jquery.com
> > http://jquery.com/discuss/
> >
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>
--
Chris Ovenden
http://thepeer.blogspot.com
"Imagine all the people / Sharing all the world"
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