Re: [svg-developers] node from id
well i just found
document.getElementById('myItemId').parentNode.removeChild(document.getElementById('myItemId));
that's a wired logic...
maiko
hi,
i am wondering what the quickest way is to get a node
reference out of an element accessed by
.getElementById(), let's say i want handle myItem as
a
node where myItem =
document.getElementById('myItemId') in order to
perform a removeChild() on it.
it's an easy thing when i have an event on that
object, my node is just evt.target and easy to
process.
any idea, or am i just not seeing the trees in the
forest?...
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Re: [svg-developers] node from id
Hi maiko,
JavaScript isn't a strongly typed language, so you don't have to cast or
anything like that. You just use the interface you need:
var myItem = document.getElementById('myItemId');
myItem.removeChild(...);
-Jonathan
On 10/17/05, osaka minami [EMAIL PROTECTED] wrote:
hi,
i am wondering what the quickest way is to get a node
reference out of an element accessed by
.getElementById(), let's say i want handle myItem as a
node where myItem =
document.getElementById('myItemId') in order to
perform a removeChild() on it.
it's an easy thing when i have an event on that
object, my node is just evt.target and easy to
process.
any idea, or am i just not seeing the trees in the
forest?...
thank you,
maiko
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Re: [svg-developers] node from id
On 10/17/05, osaka minami [EMAIL PROTECTED] wrote:
well i just found
document.getElementById('myItemId').parentNode.removeChild(
document.getElementById('myItemId));
Ah, I see. I hadn't understood it was the parent node you wanted.
that's a wired logic...
maiko
hi,
i am wondering what the quickest way is to get a node
reference out of an element accessed by
.getElementById(), let's say i want handle myItem as
a
node where myItem =
document.getElementById('myItemId') in order to
perform a removeChild() on it.
it's an easy thing when i have an event on that
object, my node is just evt.target and easy to
process.
any idea, or am i just not seeing the trees in the
forest?...
___
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RE: [svg-developers] node from id
Hi, Maiko-
If you're looking for the most optimized way, do it like this:
var myItem = doc.getElementById('myItem');
myItem.parentNode.removeChild(myItem);
That way, you're only hitting the DOM to find the element once, instead of
twice. gEBI is a rather expensive method call, I would think, especially on
large documents (unless the implementation caches a hash table of all the
ids).
It's also shorter code, and to my mind more clear. More maintainable, too...
you only have to pass in the id once, which could get lost in a refactoring.
Ideally, you'd do this:
var myItem = doc.getElementById('myItem');
if ( null != myItem )
{
myItem.parentNode.removeChild(myItem);
}
In case that item isn't there as expeccted, this will prevent your script
from choking.
Regards-
Doug
[EMAIL PROTECTED]
www.vectoreal.com ...for scalable solutions.
osaka minami wrote:
|
| hi jonathan,
|
| no, i want the node itself that lays under doc.gEBI('myItemId'). if
| doc.gEBI('myItem').parentNode.removeChild(doc.gEBI('myItem'))
| is the only way to go for e.g. a remove, well, ok. i just
| wondered if there is a shorter, clear way.
|
| thx anyway,
|
| maiko
|
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RE: [svg-developers] node from id
At 08:24 AM 10/17/2005, Doug wrote: That way, you're only hitting the DOM to find the element once, instead of twice. gEBI is a rather expensive method call, I would think, especially on large documents (unless the implementation caches a hash table of all the ids). Interesting -- I would take this to mean that if I'm creating a whole bunch of stuff dynamically -- where those things might, later on, change, then it might be best to maintain, in parallel, a JavaScript array of all the things (and their attributes). It would be redundant in terms of storage and probably chew up some memory allocation from the browser, but I suppose that is relatively cheap in comparison to the time factor. (I have noticed that when I pack more than a few hundred animated things into a page the browser gets sleepy.) Does that seem sensible? David Yahoo! Groups Sponsor ~-- Fair play? Video games influencing politics. Click and talk back! http://us.click.yahoo.com/T8sf5C/tzNLAA/TtwFAA/1U_rlB/TM ~- - To unsubscribe send a message to: [EMAIL PROTECTED] -or- visit http://groups.yahoo.com/group/svg-developers and click edit my membership Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/svg-developers/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [svg-developers] node from id
On 10/17/05, david dailey [EMAIL PROTECTED] wrote: At 08:24 AM 10/17/2005, Doug wrote: That way, you're only hitting the DOM to find the element once, instead of twice. gEBI is a rather expensive method call, I would think, especially on large documents (unless the implementation caches a hash table of all the ids). Interesting -- I would take this to mean that if I'm creating a whole bunch of stuff dynamically -- where those things might, later on, change, then it might be best to maintain, in parallel, a JavaScript array of all the things (and their attributes). It would be redundant in terms of storage and probably chew up some memory allocation from the browser, but I suppose that is relatively cheap in comparison to the time factor. (I have noticed that when I pack more than a few hundred animated things into a page the browser gets sleepy.) Does that seem sensible? David Mozilla maintains a hash table. I'd imagine most other browsers would do the same, but I could be wrong. [Non-text portions of this message have been removed] Yahoo! Groups Sponsor ~-- Get Bzzzy! (real tools to help you find a job). Welcome to the Sweet Life. http://us.click.yahoo.com/A77XvD/vlQLAA/TtwFAA/1U_rlB/TM ~- - To unsubscribe send a message to: [EMAIL PROTECTED] -or- visit http://groups.yahoo.com/group/svg-developers and click edit my membership Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/svg-developers/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
RE: [svg-developers] node from id
Hi, David- | At 08:24 AM 10/17/2005, Doug wrote: | That way, you're only hitting the DOM to find the element | once, instead | of twice. gEBI is a rather expensive method call, I would think, | especially on large documents (unless the implementation | caches a hash | table of all the ids). | | Interesting -- I would take this to mean that if I'm creating | a whole bunch of stuff dynamically -- where those things | might, later on, change, then it might be best to maintain, | in parallel, a JavaScript array of all the things (and their | attributes). That's not what I meant (by implementation, I meant the UA, the viewer, which might have some optimization of gEBI like that), but it is sometimes a sound approach (depending on your use case). I have often created a collection of objects, including the properties, metadata, and a reference to the representative element, and used that rather than the DOM to access properties, only updating the DOM when a rerendering is needed. I found that it often (but not always) worked faster and was easier than dealing with the DOM alone. Regards- Doug [EMAIL PROTECTED] www.vectoreal.com ...for scalable solutions. Yahoo! Groups Sponsor ~-- Get Bzzzy! (real tools to help you find a job). Welcome to the Sweet Life. http://us.click.yahoo.com/A77XvD/vlQLAA/TtwFAA/1U_rlB/TM ~- - To unsubscribe send a message to: [EMAIL PROTECTED] -or- visit http://groups.yahoo.com/group/svg-developers and click edit my membership Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/svg-developers/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [svg-developers] node from id
Mozilla maintains a hash table. I'd imagine most other browsers would do the same, but I could be wrong. Agreed. Another important point is this: because all of the implementations do silly stuff like maintain a hash table you can get into trouble with IDs. Supposedly the DTD has to be in force to know that an ID is an ID for getElementById-- but most implementations cheat and do something like //@id and Hash the results. Maybe not Moz, I am not sure... but this creates problems with Meta data and foreign content inside of your SVG. Cheers, Jeff Rafter Yahoo! Groups Sponsor ~-- Fair play? Video games influencing politics. Click and talk back! http://us.click.yahoo.com/T8sf5C/tzNLAA/TtwFAA/1U_rlB/TM ~- - To unsubscribe send a message to: [EMAIL PROTECTED] -or- visit http://groups.yahoo.com/group/svg-developers and click edit my membership Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/svg-developers/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
