Question

I am currently messing with the .each() function in jQuery and I am trying to count all div‘s with the the id of item and add them to a string.

The problem is, I get a callback error from my jQuery source, which I load from jquery.com’s website.

var items = "";
$('div.item').each(function(){ 
    items += $('this').data('id');
});

The error, as seen on firebug;

callback is undefined
if ( callback.call( object[ i ], i, object[ i++ ] ) === false ) { 

Answer 1

I suspect it’s not the each, it’s the .data. You probably want

items += $(this).data('id');

i.e. using this as a variable not a quoted string.