Rails spinoffs - Feb 2008 - Elements.addMethods()... what about specific types of INPUT elements?

What about using Elements.addMethods() to extend specific types of
INPUT elements such as text, radio, checkbox, hidden, etc?  Is this
possible?

The Prototype API documentation (http://prototypejs.org/api/element/
addMethods) does not appear to address this, but I could be
overlooking it.

Help!


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Just specify the tagName:

Element.addMethods(''input'', {
  isNumeric: function(element) {
    return /\s*\d+\s*/.test($F(element));
  }
})
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I understand that.  However, what if I only want to extend a specific
type of INPUT tag (e.g. RADIO, CHECKBOX or TEXT) and not every type of
INPUT tag?

On Feb 7, 4:30 pm, kangax <kan...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> Just specify the tagName:
>
> Element.addMethods(''input'', {
>   isNumeric: function(element) {
>     return /\s*\d+\s*/.test($F(element));
>   }
>
> })
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Nope - that is not supported.
Element extension mechanism has to go through quite some pain to do
what it does now. Supporting attributes would make things even more
complicated. Besides, I''m not seeing practical advantage for such
narrow differentiation.


Best,
kangax


On Feb 7, 5:40 pm, broberts
<brobert...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> I understand that.  However, what if I only want to extend a specific
> type of INPUT tag (e.g. RADIO, CHECKBOX or TEXT) and not every type of
> INPUT tag?
>
> On Feb 7, 4:30 pm, kangax
<kan...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> > Just specify the tagName:
>
> > Element.addMethods(''input'', {
> >   isNumeric: function(element) {
> >     return /\s*\d+\s*/.test($F(element));
> >   }
>
> > })
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kangax,

Thanks for the quick reply.  Attribute differentiation is obviously
less crucial than the tag differentiation already supported by
Element.addMethods().  I can understand the inherent complexity in the
element extension mechanism, so I will gladly accept "no" as the
answer to my question.  However, I can see the following advantages to
tag type (attribute) differentiation:

1. Better use (i.e less consumption) of memory by not extending
certain types of tags with extensions that really are not meant to
operate on those types of tags (e.g. TEXT versus RADIO).

2. Prevention of extensions that really are not meant to operate on
those types of tags (e.g. TEXT versus RADIO) from being called and
yielding unexpected results or even JavaScript errors.   Of course, it
could be argued that each extension should be "smart enough" to hold
its own, but I think it could be argued either way.

On Feb 7, 4:59 pm, kangax <kan...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> Nope - that is not supported.
> Element extension mechanism has to go through quite some pain to do
> what it does now. Supporting attributes would make things even more
> complicated. Besides, I''m not seeing practical advantage for such
> narrow differentiation.
>
> Best,
> kangax
>
> On Feb 7, 5:40 pm, broberts
<brobert...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> > I understand that.  However, what if I only want to extend a specific
> > type of INPUT tag (e.g. RADIO, CHECKBOX or TEXT) and not every type of
> > INPUT tag?
>
> > On Feb 7, 4:30 pm, kangax
<kan...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> > > Just specify the tagName:
>
> > > Element.addMethods(''input'', {
> > >   isNumeric: function(element) {
> > >     return /\s*\d+\s*/.test($F(element));
> > >   }
>
> > > })
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