[Seasar-user:21833] Re: kumu.jsについで

[Masaaki Yonebayashi]

周さん
米林です。

kumu.js is old  javascript library, which was used long time ago.
It support old browsers.

Try to do in the following manner.
Unzip the jar file, should be abolished prototype extensions to modify the
kumu.js.
And should be placed in the WEB-INF/lib create a jar file, including the
kumu.js the modified.



2014-03-13 10:53 GMT+09:00 周 偉明 <zhou_w ＠ worksap.co.jp>:

> 米林さん、
>
> Thank you for you reply!
>
> I'm using a bunch of JavaScript libraries, most notably jQuery UI tabs
> https://jqueryui.com/tabs/ version 1.9.2.
> When the number of tabs gets large, the performance degrades dramatically
> in IE7/IE8. Another library has
> similar performance degradation is jqgrid http://www.trirand.com/blog/version 4.4.3.
>
> As a result of investigation, these libraries rely heavily on
> Array.unshift, which is overridden by kumu.js with
> its own implementation. Saving it and restoring later after kumu.js can be
> a workaround:
>
> <script type="text/javascript">
> var originalUnshift = Array.unshift;
> </script>
> <script type="text/javascript"
>  src="/teedaExtension/org/seasar/teeda/ajax/js/kumu.js"></script>
> <script>
> Array.prototype.unshift = originalUnshift;
> </script>
>
> With this trick, I got almost 5x speed up in IE7/IE8. But there are many
> places in my project have kumu.js linked,
> so I have to apply this trick everywhere and it's really troublesome.
>
> This kind of performance penalty happens in real IE7/IE8, but not in the
> IE7/IE8 simulated mode of IE9+,
> nor in modern browsers such as Chrome/Firefox. That's probably because
> that the JavaScript engine of modern
> browsers are no optimized that the additional performance overhead caused
> by overridden Array.unshift is not
> sensible.
>
> Generally I think replacing the built-in methods provided by the browsers
> is not a good idea.
>
> Any advice or suggestion will be greatly appreciated.
>
> Best Regards,
>
>
>
> 2014-03-13 06:30:31 (+09:00) Masaaki Yonebayashi <yone ＠ abby.co.jp> wrote
> > 米林です。
> >
> > What specific process do you do when the performance desgrade?
> >
> > 2014年2月19日水曜日、周 偉明<zhou_w ＠ worksap.co.jp>さんは書きました:
> >
> > > お世話になっています。
> > > 周と申します。
> > >
> > > kumu.js is overriding the prototype of array:
> > >
> > > Array.prototype = Kumu.extend(Array.prototype, {
> > >   map:Kumu.map,
> > >   filter:Kumu.filter,
> > >   shift:Kumu.shift,
> > >   unshift:Kumu.unshift,
> > >   include:Kumu.include
> > >
> > > });
> > >
> > > which is causing serious performance problems in JavaScript heavy page
> in
> > > IE7,8.
> > >
> > > What's the reason? If kumu.js is trying to deal with legacy browsers
> > > without
> > > all these methods provided, at least it should the existence of the
> methods
> > > before overriding them.
> > >
> > > Any advice or suggestion will be greatly appreciated.
> > >
> > > Best Regards,
> > >
> > > _______________________________________________
> > > Seasar-user mailing list
> > > Seasar-user ＠ ml.seasar.org <javascript:;>
> > > https://ml.seasar.org/mailman/listinfo/seasar-user
> > >
> >
> >
> > --
> > 米 林   正 明
> > 株式会社Abby(エビイ)
> > http://abby.co.jp
> _______________________________________________
> Seasar-user mailing list
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>



-- 
米 林   正 明
株式会社Abby(エビイ)
http://abby.co.jp
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