JS prototype get class within known element

[likwid]

Hi

Can someone please answer me a quick question which is taking too long to find on the net.

With prototype I can find elements easily by className or id but how do i find an element within a know element.

eg

$$(".someClass").each(function(elmt) { });

where I want to find elements of classname 'someClass' within an element already stored.

Many thanks in advance.

 

[Augmented]

I don't use Prototype, but the docs suggest: http://www.prototypejs.org/api/element/select

var selectedChildren = $('apples').select('.someClass');

or if the parent element is already in a var:

var parentElement = $('apples');
var selectedChildren = parentElement.select('.someClass');

or use a child selector for immediate children:

var selectedChildren = $$('#apples > .someClass');

or use a descendant selector for all children:

var selectedChildren = $$('#apples .someClass');

 

[likwid]

Exactly what i was looking for but somehow unable. Thanks for your help!

 

[Augmented]

No problem. Admittedly, even though I had a good idea of what I was looking for, it wasn't easy to find in the manual . It's not the most intuitive of documentation, and I recall it being much more clear at one point.

 

[likwid]

I generally have a terrible time with api's if i'm honest, probably due to my lack of patience.

One more question. If I have an js object, how can i get the first element of it without using a for in loop.

eg

obj['some1']['some2']

How can i get 'some1' returned without using for .. in? I'm guessing it's possible but realise javascript is limited compared with other languages.

Thanks again.

 

[Augmented]

Depends exactly what you mean by 'object' - there are native Objects and native Array objects. And even then, some js frameworks have a concept of 'objects', but they're accessible as arrays. A problem of loose typing.

If your "obj" acts as, or is, an array, you can reference by index. So first element of obj['some1'] can be retrieved with obj['some1'][0] and first element of obj with obj[0].

 

[likwid]

Thanks for reply.

I'm referring to a data object, which to my understanding is actually an array in javascript. What you describe, obj[0] is pretty much exactly what I am looking for but it seems not to work, unless i'm doing something wrong.

 

[likwid]

Another problem I'm having..

	$('sidebar').select($$('div')).each(function(me){me.remove()})

This is removing anything within the sidebar, instead of just div's.

Help's appreciated.

 

[likwid]

oh, figured it out by removing the dollar signs from the select. :S