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On 1/6/11 4:47 AM, Peter van der Zee wrote:
> Actually there was some discussion on twitter related to this. Jed drew
> a simple conclusion; expando's win in speed from alternative
> methods. http://twitter.com/jedschmidt/status/22784074045198338
>
> The way I solved the leak pattern at some point was to use the expando
> pattern and store the referenced objects in an array. The object would
> then get a unique property (something like ._id usually suffices, but
> the property name itself is not very important) to point to the correct
> index in the reference array.
So, you would do something like this when attaching the initial event,
right?:
if(typeof elem._id == "undefined"){
elem._id = generateEventHandlerID();
}
I didn't go into it in the article, but IE has a property on every
created node called `uniqueNumber`:
http://msdn.microsoft.com/en-us/library/ff628957(VS.85).aspx
FuseJS does something similar to what you're doing, but on Internet
Explorer it uses elem.uniqueNumber to keep from having an expando that
would be copied when cloning an element:
https://github.com/jdalton/fusejs/blob/e5c1c4c09ed5fb6ea0e5cb2bbebc3606ae4232f5/src/dom/node.js#L76-109
I've taken the same approach in uber.js. If you can avoid expandos in
IE, you should.
> This will prevent most leaks right there. In events or wrappers you use
> the $.getId(el._id) method, reference it immediately (or in another
> similar way that you know won't stick and leak) and prevent the leakage
> completely because it's never actually stored in your event/wrapper.
>
> When time comes and the user navigates away, all you have to do is
> delete the array onbeforeunload and all references will be released at once.
Attaching an `onbeforeunload` handler will break bfcache:
https://developer.mozilla.org/En/Using_Firefox_1.5_caching
If you have a massive application, it would probably be best not to have
to re-initialize (reparse the DOM, etc.) it when navigating back to it.
- --
Bryan Forbes
http://www.reigndropsfall.net
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