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Automatic tag variables in IE acw 07-02-2008
Posted by acw on July 2, 2008, 1:03 pm
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 I am trying to understand how IE handles automatic tag variables.

I know that IE will create a global variable each time it finds a tag
with its name or id attribute set. If you have more than one tag with
the same name or id (yes this is bad) on a page then that global
variable goes from being a tag reference to being a collection of
references.

In most cases if you remove the duplicate tag the global var becomes a
tag reference again. Other times it remains a collection but with only
one element.

Getting completely away from using the automatic variables is not an
option. So, I am trying to understand how the variables are handled by
IE. Does anyone know what determines whether the global variable is
reverted to a tag reference or left as a collection when the duplicate
tags are removed from the page?


============================================================

For example, if we start with
.
<div id="container1"></div>
<div id="container2"></div>
.

then do ...

.
container1.innerHTML = "<span id='sometext'>some text</span>"
...
container2.innerHTML = "<span id='sometext'>some more text</span>"
.



The global var sometext is a collection with two elements.


If we do the following


container2.innerHTML = ""


The global var sometext is usually pointing to the first span. Other
times is a collection and sometext[0] points to the first span.




TIA!

Posted by Jonathan N. Little on July 2, 2008, 1:25 pm
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 acw wrote:
> I am trying to understand how IE handles automatic tag variables.
>
> I know that IE will create a global variable each time it finds a tag
> with its name or id attribute set. If you have more than one tag with
> the same name or id (yes this is bad) on a page then that global
> variable goes from being a tag reference to being a collection of
> references.
>
> In most cases if you remove the duplicate tag the global var becomes a
> tag reference again. Other times it remains a collection but with only
> one element.
>
> Getting completely away from using the automatic variables is not an
> option. So, I am trying to understand how the variables are handled by
> IE. Does anyone know what determines whether the global variable is
> reverted to a tag reference or left as a collection when the duplicate
> tags are removed from the page?
>
>
> ============================================================
>
> For example, if we start with
> .
> <div id="container1"></div>
> <div id="container2"></div>
> .
>
> then do ...
>
> .
> container1.innerHTML = "<span id='sometext'>some text</span>"
> ...
> container2.innerHTML = "<span id='sometext'>some more text</span>"
> .
>
>
>
> The global var sometext is a collection with two elements.
>
>
> If we do the following
>
>
> container2.innerHTML = ""
>
>
> The global var sometext is usually pointing to the first span. Other
> times is a collection and sometext[0] points to the first span.
>

The flaw is in a document all IDs must be unique, and IDs cannot be
arrays...


--
Take care,

Jonathan
-------------------
LITTLE WORKS STUDIO
http://www.LittleWorksStudio.com

Posted by acw on July 2, 2008, 1:41 pm
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Jonathan,

Thanks for the response.

Yes ids do need to be unique. In this case that are not and, because
of the nature of the project, I am not in a position to make them
unique.


I am really just wanting to understand how IE handles the automatic
vars.


TIA




> acw wrote:
> > I am trying to understand how IE handles automatic tag variables.
>
> > I know that IE will create a global variable each time it finds a tag
> > with its name or id attribute set. If you have more than one tag with
> > the same name or id (yes this is bad) on a page then that global
> > variable goes from being a tag reference to being a collection of
> > references.
>
> > In most cases if you remove the duplicate tag the global var becomes a
> > tag reference again. Other times it remains a collection but with only
> > one element.
>
> > Getting completely away from using the automatic variables is not an
> > option. So, I am trying to understand how the variables are handled by
> > IE. Does anyone know what determines whether the global variable is
> > reverted to a tag reference or left as a collection when the duplicate
> > tags are removed from the page?
>
> > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>
> > For example, if we start with
> > .
> > <div id=3D"container1"></div>
> > <div id=3D"container2"></div>
> > .
>
> > then do ...
>
> > .
> > container1.innerHTML =3D "<span id=3D'sometext'>some text</span>"
> > ...
> > container2.innerHTML =3D "<span id=3D'sometext'>some more text</span>"
> > .
>
> > The global var sometext is a collection with two elements.
>
> > If we do the following
>
> > container2.innerHTML =3D ""
>
> > The global var sometext is usually pointing to the first span. Other
> > times is a collection and sometext[0] points to the first span.
>
> The flaw is in a document all IDs must be unique, and IDs cannot be
> arrays...
>
> --
> Take care,
>
> Jonathan
> -------------------
> LITTLE WORKS STUDIOhttp://www.LittleWorksStudio.com- Hide quoted text -
>
> - Show quoted text -


Posted by Jonathan N. Little on July 2, 2008, 3:05 pm
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acw wrote:
> Jonathan,
>
> Thanks for the response.
>
> Yes ids do need to be unique. In this case that are not and, because
> of the nature of the project, I am not in a position to make them
> unique.

Well that make the document invalid, then who knows? Computers like
"Yes|No", when you throw "Maybe" at them then it is up how well of an
exception handler you got...



--
Take care,

Jonathan
-------------------
LITTLE WORKS STUDIO
http://www.LittleWorksStudio.com

Posted by Bergamot on July 2, 2008, 1:57 pm
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acw wrote:
> I am trying to understand how IE handles automatic tag variables.

I suggest asking Microsoft how their browser works because I doubt very
many people here know or care. The IE groups are over at
microsoft.public.<something about IE>

--
Berg

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