Re: [tlug] [Javascript] Shouldn't there be a sort option on objects

[Fredric Fredricson <Fredric.Fredricson@example.com>]

On 02/06/2011 11:19 AM, Dave M G wrote:
> TLUG,
>
> Just spent the last hour or so going mental trying to apply a sort() on
> an object. Turns out it only works on arrays.
Sorting an object? Would that be sorting by property name or property value?
Either way sound a bit weird to me.
> Okay, fine, but then it turns out, as far as I can tell by looking
> around the net, that there is no sort() on objects, which seems to me a
> bit of a miss. I thought objects were supposed to be more dynamic and
> flexible.
>
> What I'm actually trying to do is sort a multidimensional object that
> was created from JSON data. I found a few examples of how to do that
> with an array and the sort() method. Nice, easy to implement examples.
>
> However, sorting the data for an object seems like a nightmare. Or at
> least, I haven't been able to find an example that I can parse down to
> my level of understanding.
>
> Has anyone encountered this before and found a workable solution?
>
> For more specifics, my object looks like this
>
> toplevel.midlevel.dataIWantToSortBy
>
> "midlevel" is just a number that I use to order the data when I display
> it. "dataIWantToSortBy" contains... uh... stuff. For now let's just say
> it contains letters for alphabetical sorting.
>
> So What I want to do is turn this:
>
> toplevel.1.dataIWantToSortBy.value = C
> toplevel.2.dataIWantToSortBy.value = A
> toplevel.3.dataIWantToSortBy.value = B
>
> Into:
>
> toplevel.1.dataIWantToSortBy.value = A
> toplevel.2.dataIWantToSortBy.value = B
> toplevel.3.dataIWantToSortBy.value = C
>
> I hope that makes sense.
Not really, I'm afraid, but maybe this will help:

If I had a set of properties/values and want to sort them by value I 
would probably make a set of objects, put them in an array and provide 
an appropriate sort function to array.sort().

something like this:

arr = [ {val: 'A', name:'XXX'}, {val:'C', 
name:'XXZ'},{val:'B',name:'GGG'}] ;
arr.sort(function(a,b) {
    if (a.val == b.val) return 0 ;
    if (a.val > b.val) return 1;
    return -1 ;
}) ;

/Fredric

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