Maybe it would be better to return the index of the element in a new
jQuery obj from selector only if elem === undefined....
Regardin jQuery.inArray maybe it would be useful to heve an
jQuery.lastInArray too. Maybe with start/end index as the thrd
argument?
Something like this:
jQuery.inArray = Array.indexOf ? //some browsers have this
function(elem, array, i) {
return Array.indexOf(array, elem, i);
} :
function(array, elem, i) {
var l = array.length;
i = i === undefined ? 0 :
i < 0 ? Math.ceil(i) + l :
Math.floor(i);
for (; i < l; ++i)
if (array[i] === elem)
return i;
return -1;
};
jQuery.lastInArray = Array.lastIndexOf ? //some browsers have this
function(elem, array, i) {
return Array.lastIndexOf(array, elem, i);
} :
function(elem, array, i) {
var l = array.length
i = i === undefined ? l-1 :
i < 0 ? Math.ceil(i) + l :
Math.floor(i);
while ( i )
if ( seq[--i] === value )
return i;
return -1;
}
Thoughts?
On Jan 23, 3:21 am, John Resig <[email protected]> wrote:
> Yeah, I can dig this. You should file an enhancement ticket.
>
> --John
>
> On Thu, Jan 22, 2009 at 9:10 PM, ajpiano <[email protected]> wrote:
>
> > It would be useful to be able to use the .index() method to find the
> > index of the current element in a given set, rather than the current
> > implementation (searching the current set for a given element), which
> > forces the developer to do gyrations in order to find out a simple
> > piece of info.
>
> > For instance
>
> > $("#sometable th img").click(function() {
> > //find out index of img's parent <th> in its own <tr>
> > var $th = $(this).parent();
> > //now we have a few not so great choices
> > //1.
> > var index = $("#sometable thead tr).index($th);
> > //2.
> > var index = $th.parent().children().index($th);
> > //3. doesn't even work, but many would assume it would, and it
> > doesn't!)
> > // because the desired element is always the last one in the set.
> > var index = $th.siblings().andSelf().index($th);
> > });
>
> > Paul Irish and I propose the following enhancement, which is rough and
> > we welcome any suggestions...
>
> > jQuery.fn.index = function(elem){
>
> > // legacy implementation
> > if ( typeof elem === 'object'){
> > return jQuery.inArray(
> > elem && elem.jquery ? elem[0] : elem
> > , this );
> > }
> > //return the index of the element in a new jQuery obj from selector,
> > or by default, amongst its own siblings.
> > return jQuery.inArray(this[0],
> > elem ? jQuery(elem) : this.parent().children() );
> > };
>
> > which would allow for the following.
>
> > $("#sometable th img").click(function() {
> > //find out index of img's parent <th> in its own <tr>
> > var index = $(this).parent().index();
>
> > //for sake of example, index of image in set of all images.
> > var imgIndex = $(this).index("img");
> > });
>
> > If people think this is worthwhile, we will post an enhancement
> > ticket. Thoughts?
>
>
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