Array is lost after passed to a function

I'm getting a length of 0 for the incoming array to this method below and undefined for the array properties that's being passed in below and not sure why:

function BindAlbumDropdownList(aAlbums, defaultAlbumID)
{
    if(aAlbums.length == 0)
        return;

    var albumDropdownID = $("#abumDropdown").attr("id");

    AddDropdownItem("-Select an Album-", "-1", "albumDropdown");

    for(var a in aAlbums)
    {
        alert("a.name, a.id, albumDropdown: " + a.name + "|" + a.id + "|" +  albumDropdownID);
        AddDropdownItem(a.name, a.id, albumDr开发者_Python百科opdownID);
    }
}

I'm passing in an array that was defined earlier in another method that calls this method and the array was defined and passed like this:

var aAlbums = GetAllAlbums(userID, accessToken);
var defaultAlbumID = aAlbums[0].id;

BindAlbumDropdownList(aAlbums, defaultAlbumID)

GetAllAlbums is returning a variable setup like this inside it:

var aFacebookAlbums = []; // array

and returns this array once populated.

but when I enter the for loop in the BindAlbumDropdownList, I'm getting undefined for the array properties as well as the check for length is zero

here's what the alert is giving me:

a.name, a.id, albumDropdown: undefined|undefined|albumDropdown

I am positive GetAllAlbums is returning an array with values in it because

var defaultAlbumID = aAlbum[0].id; gives me a valid value

I noticed that it seems like BindAlbumDropdownList doesn't really know the incoming aAlbums is an array even though I am passing an array to it. Because I'm getting no intellisense showing the property array when trying to do aAlbum.length but I do get the .length property on the array just before I return it from the GetAllAlbums function.

you should use for statement and not for-in statement

for(i=0; i < aAlbums.length; i++)
{
    var a = aAlbums[i];
    alert("a.name, a.id, albumDropdown: " + a.name + "|" + a.id + "|" +  albumDropdownID);
    AddDropdownItem(a.name, a.id, albumDropdownID);
}

Are you sure you included jQuery ok? Is "abumDropdown" correct for the selector id? You can use for...in with an array in javascript even though it's not recommended.

crap Ive never gotten one before and in my excitement I answered in a comment lol!!

what would you get if you asked for the value of

0.name 1.name 2.name

?

now what would you get if you asked for the value of

a[0].name a[1].name a[2].name

 for(var a in aAlbums)
    {
        alert("aAlbums[a].name, aAlbums[a].id, albumDropdown: " + a.name + "|" + a.id + "|" +  albumDropdownID);
        AddDropdownItem(aAlbums[a].name, aAlbums[a].id, albumDropdownID);
    }