[Proto-Scripty] Re: Function expected err when doing instanceof in IE
On Dec 2, 12:11 am, yoshi <[EMAIL PROTECTED]> wrote:
> but it is defined globally? cuz i open up the js debugger console in
> IE8 beta, i type 'Element' and the debugger returns {...} so it is
> defined? And y is only Element not globally defined and not the
> Template or Hash object ? I think prototype define them on global
> scope?
>
> what i m trying to do is write a function that loops through all
> functions of an obj, do some AOP. But i m excluding Prototype defined
> objects because it causes too much recursion; to do that i m manually
> saying if obj is instance of Element, Hash and Array do nothing, and
> Element is causing problem in IE.
I might be missing something, but an object that is an `instanceof
Element` is not necessarily "Prototype defined" object; It's the one
that has `Element`'s [[Prototype]] somewhere in its prototype chain.
Afaik IE<8 does not ensure such inheritance in most of its DOM
elements. If you need to check whether an object is an element, this
naive solution should do it most of the time:
function isElement(o) {
return (!!o && o.nodeType === 1)
}
Also, don't forget that `instanceof` is not cross-frame "safe", so you
might want to use Prototype's `Object.isArray` and `Object.isHash`.
>
> things works in firefox of course
>
> thanks again for the help
[...]
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kangax
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[Proto-Scripty] Re: Function expected err when doing instanceof in IE
but it is defined globally? cuz i open up the js debugger console in
IE8 beta, i type 'Element' and the debugger returns {...} so it is
defined? And y is only Element not globally defined and not the
Template or Hash object ? I think prototype define them on global
scope?
what i m trying to do is write a function that loops through all
functions of an obj, do some AOP. But i m excluding Prototype defined
objects because it causes too much recursion; to do that i m manually
saying if obj is instance of Element, Hash and Array do nothing, and
Element is causing problem in IE.
things works in firefox of course
thanks again for the help
On Dec 1, 7:29 pm, kangax <[EMAIL PROTECTED]> wrote:
> On Dec 1, 7:36 pm, yoshi <[EMAIL PROTECTED]> wrote:
>
> > hi all,
>
> > the fowllowing js is causing err on IE:
> > $('someThing') instanceof Element
>
> > error: Function expected
>
> > it is fine on any other objects such as:
> > $('someThing') instanceof Template --> return false
> > $('someThing') instanceof Hase --> return false
>
> > any idea y Element is diff or how i can get around this problem?
>
> global `Element` is undefined in IE<8b, hence `instanceof` throws
> TypeError (as it expects a function as a right-hand expression). What
> exactly are you trying to accomplish with this "check"?
>
>
>
> > thanks in advance
>
> --
> kangax
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[Proto-Scripty] Re: Function expected err when doing instanceof in IE
On Dec 1, 7:36 pm, yoshi <[EMAIL PROTECTED]> wrote:
> hi all,
>
> the fowllowing js is causing err on IE:
> $('someThing') instanceof Element
>
> error: Function expected
>
> it is fine on any other objects such as:
> $('someThing') instanceof Template --> return false
> $('someThing') instanceof Hase --> return false
>
> any idea y Element is diff or how i can get around this problem?
global `Element` is undefined in IE<8b, hence `instanceof` throws
TypeError (as it expects a function as a right-hand expression). What
exactly are you trying to accomplish with this "check"?
>
> thanks in advance
--
kangax
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